Agilent Technologies Video Gaming Accessories 6680A User Manual
SERVICE MANUAL  
GPIB DC Power Supplies  
Agilent Series 668xA  
For instruments with Serial Numbers:  
Agilent Model 6680A: US36480101 and Above *  
Agilent Model 6681A: US36400101 and Above *  
Agilent Model 6682A: US36440101 and Above *  
Agilent Model 6683A: US36420101 and Above *  
Agilent Model 6684A: US36410101 and Above *  
* This manual also applies to instruments with the older serial number format described on page 7.  
For instruments with higher serial numbers, a change page may be included.  
For instruments with lower serial numbers, see Appendix A.  
5ꢀ  
Agilent Part No. 5960-5590  
Microfiche Part No. 5960-5591  
Printed in USA  
September, 2000  
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SAFETY CONSIDERATIONS  
GENERAL. This is a Safety Class 1 instrument (provided with terminal for connection to protective earth ground).  
OPERATION. BEFORE APPLYING POWER verify that the product is set to match the available line voltage, the  
correct line fuse is installed, and all safety precautions (see following warnings) are taken. In addition, note the instrument's  
external markings described under "Safety Symbols".  
WARNING.  
•
Servicing instructions are for use by service-trained personnel. To avoid dangerous electrical shock, do not perform  
any servicing unless you are qualified to do so.  
•
BEFORE SWITCHING ON THE INSTRUMENT, the protective earth terminal of the instrument must be connected to  
the protective conductor of the (mains) power cord. The mains plug shall be inserted only in an outlet socket that is  
provided with a protective earth contact. This protective action must not be negated by the use of an extension cord  
(power cable) that is without a protective conductor (grounding). Grounding one conductor of a two-conductor outlet is  
not sufficient protection.  
•
•
•
•
If this instrument is to be energized via an auto-transformer (for voltage change), make sure the common terminal is  
connected to the earth terminal of the power source.  
Any interruption of the protective (grounding) conductor (inside or outside the instrument), or disconnecting of the  
protective earth terminal will cause a potential shock hazard that could result in personal injury.  
Whenever it is likely that the protective earth connection has been impaired, this instrument must be made inoperative  
and be secured against any unintended operation.  
Only fuses with the required rated current, voltage, and specified type (normal blow, time delay, etc.) should be used.  
Do not use repaired fuses or short-circuited fuseholders. To do so could cause a shock or fire hazard.  
Do not operate this instrument in the presence of flammable gases or fumes.  
Do not install substitute parts or perform any unauthorized modification to this instrument.  
Some procedures described in this manual are performed with power supplied to the instrument while its protective  
covers are removed. If contacted, the energy available at many points may result in personal injury.  
Any adjustment, maintenance, and repair of this instrument while it is opened and under voltage should be avoided as  
much as possible. When this is unavoidable, such adjustment, maintenance, and repair should be carried out only by a  
skilled person who is aware of the hazard involved.  
•
•
•
•
•
Capacitors inside this instrument may hold a hazardous electrical charge even if the instrument has been disconnected  
from its power source.  
SAFETY SYMBOLS.  
Instruction manual symbol. The instrument will be marked with this symbol when it is necessary for you to refer to the  
instruction manual in order to protect against damage to the instrument.  
This sign indicates hazardous voltages.  
This sign indicates an earth terminal (sometimes used in the manual to indicate circuit common connected to a ground  
chassis).  
The WARNING sign denotes a hazard. It calls attention to a procedure, practice, or the like, which, if not correctly  
performed or adhered to, could result in personal injury. Do not proceed beyond a WARNING sign until the  
indicated conditions are fully understood and met.  
The CAUTION sign denotes a hazard. It calls attention to an operating procedure, or the like, which, if not correctly  
performed or adhered to, could result in damage to or destruction of part or all of the product. Do not proceed  
beyond a CAUTION sign until the indicated conditions are fully understood and met.  
.
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Safety Symbol Definitions  
Symbol  
Description  
Direct current  
Symbol  
Description  
Terminal for Line conductor on permanently  
installed equipment  
Alternating current  
Caution, risk of electric shock  
Both direct and alternating current  
Three-phase alternating current  
Earth (ground) terminal  
Caution, hot surface  
Caution (refer to accompanying documents)  
In position of a bi-stable push control  
Protective earth (ground) terminal  
(Intended for connection to external  
protective conductor.)  
Out position of a bi-stable push control  
On (supply)  
Frame or chassis terminal  
Terminal for Neutral conductor on  
permanently installed equipment  
Off (supply)  
Terminal is at earth potential  
Standby (supply)  
(Used for measurement and control  
circuits designed to be operated with  
one terminal at earth potential.)  
Units with this symbol are not completely  
disconnected from ac mains when this switch is  
off. To completely disconnect the unit from ac  
mains, either disconnect the power cord or have  
a qualified electrician install an external switch.  
Printing History  
The edition and current revision of this manual are indicated below. Reprints of this manual containing minor corrections  
and updates may have the same printing date. Revised editions are identified by a new printing date. A revised edition  
incorporates all new or corrected material since the previous printing date. Changes to the manual occurring between  
revisions are covered by change sheets shipped with the manual. Also, if the serial number prefix of your power supply is  
higher than those listed on the title page of this manual, then it may or may not include a change sheet. That is because  
even though the higher serial number prefix indicates a design change, the change may not affect the content of the manual.  
Edition 1  
Edition 2  
April 1994  
September, 2000  
© Copyright 1993, 2000 Agilent Technologies, Inc.  
This document contains proprietary information protected by copyright. All rights are reserved. No part of this document  
may be photocopied, reproduced, or translated into another language without the prior consent of Agilent Technologies,  
Inc. The information contained in this document is subject to change without notice.  
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Table of Contents  
Introduction ............................................................................................................................................................................ 7  
Scope................................................................................................................................................................................... 7  
Organization..................................................................................................................................................................... 7  
Instrument Identification..................................................................................................................................................... 7  
Related Documents .......................................................................................................................................................... 8  
Change Sheet................................................................................................................................................................. 8  
Operating Manual.......................................................................................................................................................... 8  
Manual Revisions............................................................................................................................................................. 8  
Firmware Revisions ......................................................................................................................................................... 8  
Safety Considerations ......................................................................................................................................................... 9  
Conventions ........................................................................................................................................................................ 9  
Electrostatic Discharge ....................................................................................................................................................... 9  
Verification............................................................................................................................................................................ 11  
Introduction....................................................................................................................................................................... 11  
Tests.................................................................................................................................................................................. 11  
Test Equipment Required.................................................................................................................................................. 11  
List of Equipment........................................................................................................................................................... 11  
Current-Monitoring Resistor.......................................................................................................................................... 11  
Electronic Load.............................................................................................................................................................. 12  
Programming The Tests.................................................................................................................................................... 13  
General Considerations .................................................................................................................................................. 13  
Programming Parameters ............................................................................................................................................ 13  
General Measurement Techniques.................................................................................................................................... 13  
Performance Test Record Sheets ...................................................................................................................................... 13  
Operation Verification Tests............................................................................................................................................. 14  
Performance Tests............................................................................................................................................................. 14  
Constant Voltage (CV) Tests ......................................................................................................................................... 14  
Test Setup.................................................................................................................................................................... 14  
Test Procedures ........................................................................................................................................................... 14  
Constant Current (CC) Tests.......................................................................................................................................... 19  
Test Setup.................................................................................................................................................................... 19  
Test Procedures ........................................................................................................................................................... 19  
Averaging the CC Measurements................................................................................................................................... 24  
Troubleshooting.................................................................................................................................................................... 31  
Introduction....................................................................................................................................................................... 31  
Localizing the Problem .................................................................................................................................................. 31  
Chapter Organization ..................................................................................................................................................... 31  
Test Equipment Required.................................................................................................................................................. 32  
Troubleshooting Procedures ............................................................................................................................................. 32  
Power-On Selftest .......................................................................................................................................................... 32  
Description.................................................................................................................................................................. 32  
Disabling The Power-On Selftest................................................................................................................................ 32  
Using the *TST? Query (GPIB Systems Supplies Only) ............................................................................................ 32  
Troubleshooting Charts.................................................................................................................................................. 34  
Troubleshooting Test Points........................................................................................................................................... 34  
Bias and Reference Supplies.......................................................................................................................................... 34  
CV/CC Status Annunciators Troubleshooting ............................................................................................................... 53  
A3 FET Board Troubleshooting..................................................................................................................................... 53  
Signature Analysis ............................................................................................................................................................ 56  
Introduction.................................................................................................................................................................... 56  
Firmware Revisions ....................................................................................................................................................... 56  
Test Headers................................................................................................................................................................... 57  
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Post-Repair Calibration..................................................................................................................................................... 62  
When Required .............................................................................................................................................................. 62  
Inhibit Calibration Jumper ............................................................................................................................................. 62  
Calibration Password ..................................................................................................................................................... 62  
Restoring Factory Calibration Constants ....................................................................................................................... 62  
EEPROM Initialization..................................................................................................................................................... 63  
Transferring Calibration Constants To Factory Preset Locations ..................................................................................... 63  
Disassembly Procedures ................................................................................................................................................... 68  
Tools Required............................................................................................................................................................... 68  
Top Cover ...................................................................................................................................................................... 69  
Removing Protective RFI Shield (Galvanized Sheet Metal).......................................................................................... 69  
GPIB Board.................................................................................................................................................................... 69  
A4 AC Input Assembly.................................................................................................................................................. 70  
A5 DC RAIL Assembly................................................................................................................................................. 70  
A6 BIAS Assembly........................................................................................................................................................ 70  
A3 FET Board................................................................................................................................................................ 70  
A10 Control Assembly................................................................................................................................................... 71  
Front Panel Assembly .................................................................................................................................................... 71  
S1 Line Switch............................................................................................................................................................... 71  
A1 Front Panel Board..................................................................................................................................................... 71  
A1DSP1 LCD Display................................................................................................................................................... 72  
A1G1 and A1G2 Rotary Controls.................................................................................................................................. 72  
A1KPD Keypad ............................................................................................................................................................. 72  
Output Bus Boards A7, A81 and A9 & Chassis Components........................................................................................ 72  
Principles Of Operation ....................................................................................................................................................... 81  
Introduction....................................................................................................................................................................... 81  
A2 GPIB Board................................................................................................................................................................. 81  
A1 Front Panel Assembly ................................................................................................................................................. 82  
A10 Control Board............................................................................................................................................................ 82  
Secondary Interface (P/O A10 Board) ........................................................................................................................... 82  
A4 AC Input Board........................................................................................................................................................... 85  
A5 DC Rail Board............................................................................................................................................................. 85  
A3 FET Board................................................................................................................................................................... 85  
Output Circuits.................................................................................................................................................................. 86  
Replaceable Parts.................................................................................................................................................................. 89  
INTRODUCTION ............................................................................................................................................................ 89  
Chapter Organization ..................................................................................................................................................... 89  
Reading the Tables......................................................................................................................................................... 89  
How To Order Parts.......................................................................................................................................................... 90  
Diagrams.............................................................................................................................................................................. 115  
Introduction..................................................................................................................................................................... 115  
Chapter Organization...................................................................................................................................................... 115  
General Schematic Notes................................................................................................................................................ 119  
Backdating........................................................................................................................................................................... 149  
Index .................................................................................................................................................................................... 155  
6
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1
Introduction  
Scope  
Organization  
This manual contains information for troubleshooting and repairing to the component level Agilent Series 668xA,  
5-kilowatt power supplies. The remaining chapters of this manual are organized as follows:  
Chapter  
Chapter 2  
Chapter 3  
Description  
Verification procedures to determine the performance level of the supply either before or after repair.  
Troubleshooting procedures for isolating a problem, procedures for replacing the defective component  
and, if required, post-repair calibration and EEPROM initialization procedures.  
Principles of power supply operation on a block-diagram level.  
Chapter 4  
Chapter 5  
Chapter 6  
Appendix A  
Replaceable parts, including parts ordering information.  
Diagrams, including schematics, component location drawings, and troubleshooting test points.  
Backdating information for power supplies with serial numbers below those listed in the title page of  
this manual.  
Instrument Identification  
Agilent Technologies instruments are identified by a 10-digit serial number. The format is described as follows: first two  
letters indicate the country of manufacture. The next four digits are a code that identify either the date of manufacture or of  
a significant design change. The last four digits are a sequential number assigned to each instrument.  
Item  
US  
Description  
The first two letters indicates the country of manufacture, where US = USA.  
3648  
This is a code that identifies either the date of manufacture or the date of a significant design  
change.  
0101  
The last four digits are a unique number assigned to each power supply.  
If the serial number prefix on your unit differs from that shown on the title page of this manual, a yellow Manual Change  
sheet may be supplied with the manual. It defines the differences between your unit and the unit described in this manual.  
The yellow change sheet may also contain information for correcting errors in the manual.  
Older serial number formats used with these instruments had a two-part serial number, i.e. 2701A-00101. This manual also  
applies to instruments with these older serial number formats. Refer to Appendix A for backdating information.  
Introduction  
7
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Related Documents  
Change Sheet  
There may or may not be a Manual Change sheet included with this manual (see Manual Revisions). If one is included, be  
sure to examine it for changes to this manual.  
Operating Manual  
Each power supply is shipped with an operating manual (see Replaceable Parts, Chapter 5 for part numbers) that covers the  
following topics:  
•
Options, accessories, specifications, supplementary characteristics, output characteristic curve, typical output  
impedance curves.  
•
•
•
•
•
•
•
•
•
•
•
Connecting the power cord, load, and remote sensing.  
Connecting power supplies in series or autoparallel.  
Connecting the remote controller and setting the GPIB address.  
Configuring the digital port for remote inhibit, relay link, or digital I/O operation.  
Connecting the analog port for external voltage programming control.  
Turn-on tests, including selftest errors and runtime errors.  
Front panel operation.  
SCPI programming, an introduction to syntax, language dictionary, and status register operation.  
Compatibility-language programming for operation with Agilent Series 603xA power supplies.  
Replacement of line fuse and conversion of line voltage.  
Calibration procedure (front panel and remote).  
Manual Revisions  
This manual was written for power supplies that have the same serial prefixes (first part) as those listed on the title page and  
whose serial numbers (second part) are equal to or higher than those listed in the title page.  
1) If the serial prefix of your supply is higher than that shown in the title page then the supply was made  
Note  
after the publication of this manual and may have hardware and/or firmware differences not covered in  
the manual.  
2) If they are significant to the operation and/or servicing of the power supply, those differences are  
documented in one or more Manual Changes sheets included with this manual.  
3) If the serial prefix on the power supply is lower than that shown on the title page, then the supply was  
made before the publication of this manual and can be different from that described here. Such  
differences are covered in "Appendix A – Manual Backdating Changes".  
Firmware Revisions  
The power supply's firmware resides in the A10 control board microprocessor chip and in ROM chips on the A2 GPIB and  
A1 Front Panel boards. You can obtain the firmware revision number by either reading the integrated circuit label, or query  
the power supply using the GPIB *IDN query command (see Chapter 3 - Troubleshooting). Also, see Chapter 3, Firmware  
Revisions for the actual Agilent BASIC program that does this.  
8
Introduction  
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Safety Considerations  
This power supply is a Safety Class I instrument, which means it has a protective earth terminal. This terminal must be  
connected to earth ground through a power source equipped with a 4-wire, ground receptacle. Refer to the "Safety  
Summary" page at the beginning of this manual for general safety information. Before operation or repair, check the power  
supply and review this manual for safety warnings and instructions. Safety warnings for specific procedures are located at  
appropriate places in the manual.  
Hazardous voltage exist within the power supply chassis, at the output terminals, and at the analog  
programming terminals.  
Conventions  
•
In diagrams, the name of a complementary signal is sometimes shown with a bar above the signal mnemonic. In other  
diagrams and in the text, complementary signals are shown with an asterisk (*) after the mnemonic (such as PCLR*).  
A mnemonic with a bar over it or an asterisk after it represents the same signal.  
•
In this manual, all Agilent 668xA series supplies are referred to as system supplies.  
Electrostatic Discharge  
The power supply has components that can be damaged by ESD (electrostatic discharge). Failure to  
observe standard, antistatic practices can result in serious degradation of performance, even when an  
actual failure does not occur.  
When working on the power supply observe all standard, antistatic work practices. These include, but are not limited to:  
•
working at a static-free station such as a table covered with static-dissipative laminate or with a conductive table mat  
(Agilent P/N 9300-0797, or equivalent).  
•
•
•
using a conductive wrist strap, such as Agilent P/N 9300-0969 or 9300-0970.  
grounding all metal equipment at the station to a single common ground.  
connecting low-impedance test equipment to static-sensitive components only when those components have power  
applied to them.  
•
removing power from the power supply before removing or installing printed circuit boards.  
Introduction  
9
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2
Verification  
Introduction  
This chapter provides test procedures for checking the operation of Agilent Series 668xA power supplies. The required test  
equipment is specified and sample performance test record sheets are included. Instructions are given for performing the  
tests either from the front panel or from a controller over the GPIB.  
Tests  
Two types of procedures are provided: Operation Verification tests and Performance tests.  
Type of Test  
Purpose  
Operation Verification  
These tests do not check all parameters, but comprise a short procedure to verify that the power  
supply is performing properly.  
Performance  
These tests verify all the Specifications (not Supplementary Characteristics) listed in Table 1-1  
of the Power Supply Operating Manual.  
If you encounter failures or out-of-specification test results, see Troubleshooting Procedures (Chapter 3). The procedures  
will determine if repair and/or calibration is required.  
Note  
The power supply must pass the selftest at power-on before the following tests can be performed. If the  
power supply fails selftest, go to Chapter 3.  
Test Equipment Required  
List of Equipment  
Table 2-1 lists the equipment required to perform the tests given in this chapter. Only the equipment marked with the  
superscript "1'' is needed for the Operation Verification test.  
Current-Monitoring Resistor  
The four-terminal, current-monitoring resistor (current shunt) listed in Table 2-1 is required to eliminate output current  
measurement error caused by voltage drops in leads and connections. The specified current shunts have special  
current-monitoring terminals inside the load connection terminals. The accuracy of the current shunt must be 0.04% or  
better. When using the 1000 amp 0.05% current shunt the measurement uncertainty should be stated for all calibrations.  
Connect the current monitor directly to these current-monitoring terminals.  
Verification 11  
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Table 2-1. Test Equipment Required  
Required Characteristics  
Type  
Recommended Model  
Agilent 3458A  
Digital Voltmeter1  
Resolution: 10 nV @ 1V  
Readout: 8 1/2 digits  
Accuracy: 20 ppm  
Agilent 6682A, 6683A, Agilent 6684A:  
0.001Ω 0.04%, 300A, 100W  
Current Monitor Resistor1  
Guildline 9230/300  
Agilent 6680A, 6681A  
Burster Type 1280  
100 µΩ 0.05%, 1000A  
DC Power Source with current capability Agilent 6680A  
equal to UUT  
Range: Voltage and current range must  
exceed that of supply under test. Power:  
5.4KW minimum  
DC Power Supply  
Electronic Load  
3 each Agilent 6050A, w/3 each  
Agilent 60504B per Agilent 6050A  
for all units  
or  
5 Kilowatt minimum  
Resistor Load  
Agilent 6680A = 5.7 milliohms 4375W  
Agilent 6681A = 13.8 milliohms 4640W  
Agilent 6682A = 87.5 milliohms. 5040W  
Agilent 6683A = 200 milliohms 5120W  
Agilent 6684A = 312 milliohms 5120W  
Sensitivity: 1mV  
Agilent 54504A  
Agilent 3400B  
Oscilloscope  
Bandwidth Limit: 20MHz  
Probe: 1:1 with RF tip  
True RMS Bandwidth: 20MHz  
RMS Voltmeter  
Sensitivity: 100 µV  
0.1Volt per ampere: 1Hz to 20MHz  
Power: 3 Phase 24KVA; Range:  
180-235V 47 - 63Hz; 360- 440V  
47 - 63Hz  
Pearson Model 411  
Superior Powerstat  
1156DT-3Y, 0-280V, 50A,  
24.2 KVA or equivalent .  
Current Transformer  
Variable-Voltage  
Transformer (AC Source)  
GPIB Controller2  
Full GPIB capabilities  
HP Series 200/300  
1
Required for Operation Verification Tests.  
Required for remote testing of 668xA models.  
2
Electronic Load  
Many of the test procedures require the use of a variable load capable of dissipating the required power. If a variable  
resistor is used, switches must be used for connecting, disconnecting, and shorting the load resistor. For most tests, an  
electronic load (see Table 2-1) is easier to use than a variable resistor. However, an electronic load may not be fast enough  
for testing transient recovery time or may be too noisy for testing noise (PARD). In these cases, fixed load resistors of  
suitable power dissipation can be used with minor changes to the test procedures given in this chapter.  
12 Verification  
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Programming The Tests  
General Considerations  
Procedures are given for programming these tests either from the front panel keypad or from a GPIB controller. The  
procedures assume you know how to use the front panel keypad or how to program over the GPIB (see the Power Supply  
Operating Manual for more information). When using computer-controlled tests, you may have to consider the relatively  
slow (compared to computer and system voltmeters) settling times and slew rates of the power supply. Suitable WAIT  
statements can be inserted into the test program to give the power supply time to respond to the test commands.  
This power supply can provide more than 240VA at more than 2 volts. If the output connections touch each  
other, severe arcing can occur resulting in burns, ignition or welding of parts. DO NOT ATTEMPT  
TO MAKE CONNECTIONS WHILE OUTPUT POWER IS ON. These connections should be performed  
only by qualified electronics personnel.  
Programming Parameters  
Table 2-2 lists the programming voltage and current values for each model. You can enter these values either from the front  
panel or from a controller over the GPIB.  
Table 2-2. Programming Voltage and Current Values  
Agilent Model  
Full Scale  
Voltage  
5V  
Max. Prog.  
Voltage  
5.125V  
Full Scale  
Current  
875A  
Max. Prog.  
Current  
895A  
Max. Prog.  
Overvoltage  
6.25V  
Agilent 6680A  
Agilent 6681A  
Agilent 6682A  
Agilent 6683A  
Agilent 6684A  
8V  
21V  
32V  
40V  
8.190V  
21.50V  
32.75V  
41.00V  
580A  
240A  
160A  
128A  
592A  
246A  
164A  
131A  
10.0V  
25.2V  
38.4V  
48.0V  
General Measurement Techniques  
Figure 2-1 shows the setup for the Constant Voltage tests. Measure the dc output voltage directly at the sense (+S and -S)  
terminals. Connect these terminals for remote sensing (to the +S and -S terminals). Connect these terminals for local  
sensing. Be certain to use load leads of sufficient wire gauge to carry the output current (see Chapter 4 of the Power Supply  
Operating Manual). To avoid noise pickup, use coaxial cable or shielded pairs for the test leads. If you use more than one  
meter or a meter and an oscilloscope, connect separate leads for each instrument to avoid mutual-coupling effects.  
Performance Test Record Sheets  
When performing the tests in this chapter, refer to the Performance Test Record sheets supplied at the end of this chapter.  
Table 2-6 is for recording common information, such as, the test equipment used and the environmental conditions. Tables  
2-7 through 2-11 are dedicated to specific models. Each sheet lists the acceptable test ranges for the model and provides a  
place to record the results of the test.  
Note  
It is recommended that before you perform the tests in either Table 2-4 or Table 2-5, that you first locate  
the appropriate Performance Test Record sheet from Tables 2-7 through Table 2-11 for your specific  
model. Make a copy of this sheet, and record the actual observed values in it while performing the tests.  
Use the sheets in Tables 2-7 through Table 2-11 as master reference sheets to run copies at any time.  
Verification 13  
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Operation Verification Tests  
Table 2-3 lists the requirements for operation verification, which is a subset of the performance tests.  
Table 2-3. Operation Verification Tests  
Test  
Refer To  
Power Supply Operating Manual  
Table 2-4  
1
2
3
Turn-On Checkout  
Voltage Programming and Readback Accuracy  
Current Programming and Readback Accuracy  
Table 2-5  
Note: Record the results of Tests 2 and 3 in the appropriate Performance Test Record sheets  
Performance Tests  
Performance tests check all the specifications of the power supply. The tests are grouped into constant-voltage mode tests  
(Table 2-4) and constant-current mode tests (Table 2-5).  
Constant Voltage (CV) Tests  
Test Setup  
Connect your dc voltmeter leads to only +S and -S (see Figure 2-1), because the power supply regulates the voltage  
between these points, not between the + and - output terminals .  
Test Procedures  
Perform the test procedures in Table 2-4. The CV tests are:  
•
•
•
•
•
Voltage Programming and Readback Accuracy  
CV Load Effect  
CV Source Effect  
CV Noise (PARD)  
Transient Recovery Time  
Note  
The tests are independent and may be performed in any order.  
14 Verification  
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Figure 2-1. Constant Voltage (CV) Test Setup  
Verification 15  
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Table 2-4. Constant Voltage (CV) Tests  
Action  
Normal Result  
Voltage Programming and Readback Accuracy  
This test verifies that the voltage programming, GPIB readback (GPIB system power supplies only), and front panel display  
functions are within specifications. With system power supplies, values read back over the GPIB should be the same as  
those displayed on the front panel.  
1
2
3
Turn off the power supply and connect a DVM across +S and -S  
(see Fig. 2-1).  
Turn on the power supply with no load and program the output for 0 volts  
and maximum programmable current (see Table 2-2).  
CV annunciator on. Output current near  
0.  
Record voltage readings at DVM and on front panel display.  
Readings within specified Low Voltage  
limits.  
4
5
Program voltage to full scale (see Table 2-2).  
Record voltage readings of DVM and on front panel display.  
Readings within specified High Voltage  
limits.  
CV Load Effect  
This test measures the change in output voltage resulting from a change in output current from full-load to no-load.  
1
2
3
Turn off the power supply and connect a DVM across +S and -S  
(see Fig. 2-1).  
Turn on the power supply and program the current to its maximum  
programmable value and the voltage to its full-scale value (see Table 2-2).  
Adjust the load to produce full-scale current (see Table 2-2) as shown on  
the front panel display.  
CV annunciator is on. If it is not, adjust  
the load to slightly reduce the output  
current until the annunciator comes on.  
4
5
Record voltage reading of the DVM.  
Adjust load to draw 0 amperes (open load). Record voltage reading of the  
DVM.  
6
Check test result.  
The difference between the DVM  
readings in steps 4 and 5 are within the  
specified Load Effect limits.  
CV Source Effect  
This test measures the change in output voltage resulting from a change in ac line voltage from its minimum to maximum  
value within the line voltage specifications.  
1
Turn off the power supply and connect the ac power input through a  
variable-voltage transformer.  
16 Verification  
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Table 2-4. Constant Voltage (CV) Tests (continued)  
Action  
Normal Result  
CV Source Effect (cont)  
2
3
4
5
Set the transformer to the nominal ac line voltage. Connect the DVM  
across +S and -S (see Fig. 2-1).  
Turn on the power supply and program the current to its maximum  
programmable value and the voltage to its full-scale value (see Table 2-2).  
Adjust the load to produce full-scale current (see Table 2-2) as shown on  
the front panel display.  
CV annunciator is on. If it is not, adjust  
the load to slightly reduce the output  
current until the annunciator comes on.  
Adjust the transformer to decrease the ac input voltage to the low- line  
condition (174Vac or 191Vac). Record the output voltage reading of the  
DVM.  
6
7
Adjust the transformer to increase the ac input voltage to the high-line  
condition (220Vac or 250Vac). Record the output voltage reading on the  
DVM.  
Check test result.  
The difference between the DVM  
readings in steps 5 and 6 are within the  
specified Source Effect limits.  
CV Noise (PARD)  
Periodic and random deviations (PARD) in the output (ripple and noise) combine to produce a residual ac voltage  
superimposed on the dc output voltage. This test measures CV PARD, specified as the rms and peak-to-peak output  
voltages over the frequency range of 20Hz to 20MHz.  
1
Turn off the power supply and connect an a-c coupled oscilloscope across  
the + and -output terminals (see Fig. 2-1). Set the oscilloscope bandwidth  
limit to 20MHz (30MHz for the Agilent 54504A) and use an RF tip on the  
oscilloscope probe.  
2
3
Turn on the power supply and program the current to its maximum  
programmable value and the voltage to its full-scale value (see Table 2-2).  
Adjust the load to produce full-scale current (see Table 2-2) as shown on  
the front panel display.  
CV annunciator is on. If it is not, adjust  
the load to slightly reduce the output  
current until the annunciator comes on.  
4
Record the amplitude of the waveform.  
Amplitude is within the specified PARD  
Peak-to-Peak limits.  
5
6
Replace the oscilloscope connection with an ac rms voltmeter.  
Record the reading obtained in Step 5.  
Amplitude is within the specified PARD  
rms limits.  
Verification 17  
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Table 2-4. Constant Voltage (CV) Tests (continued)  
Action  
Normal Result  
Transient Recovery Time  
This test measures the time required for the output voltage to return to within 100mV of its final value following a 50%  
change in output load current. Measurements are made on both the unloading transient (from full load to 1/2 load) and the  
loading transient (from 1/2 load to full load).  
1
2
3
Turn off the power supply and connect an oscilloscope across +S and -S  
(see Fig. 2-1).  
Turn on the power supply and program the current to its maximum  
programmable value and the voltage to its full-scale value (see Table 2-2).  
Program the Electronic Load as follows:  
þ
þ
þ
þ
þ
Operating mode to constant current.  
Input load current to 1/2 the supply's full rated output current.  
Transient current level to the supply's full rated output current.  
Transient generator frequency = 100Hz.  
Transient generator duty cycle = 50%.  
4
5
Turn on the transient and adjust the oscilloscope to display response  
waveform.  
See Fig. 2-2.  
Measure both the loading and unloading transients by triggering the  
oscilloscope on both the negative and positive slopes of the transient.  
Record the voltage level obtained at the 900-µs interval .  
Specified voltage level is reached within  
900µs.  
Figure 2-2. Transient Response Waveform  
18 Verification  
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Constant Current (CC) Tests  
Test Setup  
Connect the appropriate current monitoring resistor (see Table 2-l) as shown in Fig. 2-3. The accuracy of the resistor must  
be as specified in the table.  
Test Procedures  
The test procedures are given in Table 2-5. The tests are independent and may be performed in any order. The CC tests are:  
•
•
•
•
Current Programming and Readback Accuracy.  
CC Load Effect.  
CC Source Effect.  
CC Noise (PARD).  
Table 2-5. Constant Current (CC) Tests  
Action  
Normal Result  
Current Programming and Readback Accuracy  
This test verifies that the current programming and readback are within specification.  
1
2
Turn off the power supply and connect the current monitoring resistor as  
shown in Fig. 2-3. Connect a DVM across the resistor .  
Turn on the power supply and program the output for 5 volts and 0  
amperes.  
3
4
Short the load.  
Observe the DVM voltage reading. Divide this by the resistance of the  
current monitor resistor. Record the result as the Low Current value.  
Value within specified Low Current  
limits.  
5
6
7
Record the front panel display readback.  
Program output current to full scale (see Table 2-2).  
Repeat Steps 4 and 5.  
Value within specified readback limits.  
Both current readings within specified  
High Current and readback limits.  
CC Noise (PARD)  
Periodic and random deviations (PARD) in the output (ripple and noise) combine to produce a residual ac current  
superimposed on the dc output current. This test measures CC PARD, specified as the rms output current over the  
frequency range of 20 Hz to 20 MHz.  
1
Turn off the power supply and connect the current transformer, resistor,  
capacitor and rms voltmeter (see Fig. 2-4).  
Verification 19  
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Table 2-5. Constant Current (CC) Tests (continued)  
Action  
Normal Result  
CC Noise (PARD) (cont)  
2
Measure the residual noise on the DVM with the power supply turned off.  
Noise generated by other equipment may affect this measurement and  
should be removed or factored out.  
3
4
Turn on the power supply and program the current to its full scale value  
and the voltage to its maximum programmable value (see Table 2-2).  
Adjust the load in the CV mode for full-scale voltage (see Table 2-2) as  
shown on the front panel display.  
The power supply output current should  
be at its full-scale value and the CC  
annunciator on. If it is not, adjust the  
load to slightly reduce the output  
voltage until the annunciator comes on.  
5
Observe the reading on the rms voltmeter. Multiply rms voltage by 0.1 to  
obtain the rms noise current.  
Current is within the specified PARD  
rms limits (see Table 2-6).  
CC Load Effect  
This test measures the change in output current resulting from a change in load from full-load voltage to a short circuit. It is  
recommended that you use averaged readings for Steps 5 and 6 of this test (see Averaging AC Measurements at the end of  
this chapter).  
Note: Refer to Figure 2-4. If you are using Agilent 60504B Eloads, a series DC power source is required to supply the  
minimum 3 volt input required by the Agilent 60504B Eloads. The series DC source must be capable of 3VDC at a current  
level greater than the output current of the supply being tested. A switch can be used in place of the series supply if the  
Eloads are used in place of a load resistor as shown in Fig. 2-4(b).  
1
2
3
Turn off the power supply and connect a DVM across the current  
monitoring resistor (see Fig. 2-3).  
Turn on the power supply and program the current to its full scale value  
and the voltage to its maximum programmable value (see Table 2-2).  
Set the Electronic Load to CV mode and its voltage to full scale as  
indicated on its front panel display. Set the series supply for 3VDC and a  
Power supply output current is full scale  
and its CC annunciator is on. If not,  
current greater than that being tested. Series source should be in CV mode. reduce the Electronic Load voltage  
slightly until the annunciator comes on.  
4
5
6
Observe the DVM reading. Divide this by the resistance of the current  
monitoring resistor to obtain the output current. Record the result.  
You may want to use an averaged  
reading for this measurement.  
Program the Electronic Load input to 3 volts or short the Electronic Load  
input and repeat Step 5.  
You may want to use averaged reading  
for this measurement.  
Check the result.  
The difference between the current  
readings taken in Step 5 and Step 6 must  
be within specified “Load Effect” limits  
(see Table 2-2).  
20 Verification  
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Table 2-5. Constant Current (CC) Tests (continued)  
Action  
Normal Result  
CC Source Effect  
This test measures the change in output current resulting from a change in ac line voltage from its minimum to its  
maximum value within the line voltage specifications. It is recommended that you use averaged readings for Steps 6 and 8  
of this test (see "Averaging AC Measurements" at the end of this chapter) .  
1
2
3
4
Turn off the power supply and connect the ac power input through a  
variable-voltage transformer.  
Set the transformer to the nominal ac line voltage. Connect the DVM  
across the current monitoring resistor (see Fig. 2-3).  
Turn on the power supply and program the current to its full-scale value  
and the voltage to its maximum programmable value (see Table 2-2).  
Set the Electronic Load to CV mode and its voltage to full scale.  
The power supply output current is full  
scale and its CC annunciator is on. If  
not, reduce the Electronic Load voltage  
slightly until the annunciator comes on.  
5
6
7
8
9
Adjust the transformer to decrease the ac input voltage to the low-line  
condition (180Vac or 360Vac).  
Observe the DVM reading. Divide this voltage by the resistance of the  
current monitoring resistor to obtain the output current. Record the result.  
You may want to use an averaged  
reading for this measurement.  
Adjust the transformer to increase the ac input voltage to the high-line  
condition (235Vac or 440Vac).  
Observe the DVM reading. Divide this voltage by the resistance of the  
current monitoring resistor to obtain the output current. Record the result.  
You may want to use an averaged  
reading for this measurement.  
Check the test result.  
The difference between the current  
readings found in Step 6 and Step 8 is  
within the specified current Source  
Effect limits.  
Verification 21  
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Figure 2-3. CC Load Effect Test Setup  
22 Verification  
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Figure 2-4. CC rms Noise Test Setup  
Verification 23  
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Averaging the CC Measurements  
The CC Load Effect and CC Source Effect tests measure the dc regulation of the power supply's output current. When  
doing these tests, you must be sure that the readings taken are truly dc regulation values and not instantaneous ac peaks of  
the output current ripple. You can do this by making each measurement several times and then using the average of the  
measurements as your test value. Voltmeters such as the Agilent 3458A System Voltmeter can be programmed to take just  
such statistical average readings as required by these tests.  
The following steps show how to set up the voltmeter from its front panel to take a statistical average of l00 readings.  
represents the unlabeled shift key in the FUNCTION/RANGE group.  
1. Program 10 power line cycles per sample by pressing  
.
2. Program 100 samples per trigger by pressing  
.
3. Set up voltmeter to take measurements in the statistical mode as follows:  
a. Press  
b. Press  
c. Press  
.
until MATH function is selected, then press  
.
until STAT function is selected, then press  
.
4. Now set up voltmeter to read the average of the measurements as follows:  
a. Press  
b. Press  
c. Press  
.
until RMATH function is selected, then press  
until MEAN function is selected, then press  
.
.
5. Execute the average reading program by pressing  
.
6. Wait for 100 readings and then read the average measurement by pressing  
.
Record this as your result.  
24 Verification  
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Table 2-6. Performance Test Record Form  
Test Facility:  
__________________________________________  
__________________________________________  
__________________________________________  
__________________________________________  
Model_____________________________________  
Serial No.__________________________________  
Options ____________________________________  
Firmware Revision ___________________________  
Report No.__________________________________________  
Date______________________________________________  
Customer___________________________________________  
Tested By___________________________________________  
Ambient Temperature (°C)______________________________  
Relative Humidity (%)_________________________________  
Nominal Line Frequency (Hz)___________________________  
Special Notes:  
____________________________________________________________________________________________  
____________________________________________________________________________________________  
____________________________________________________________________________________________  
____________________________________________________________________________________________  
____________________________________________________________________________________________  
____________________________________________________________________________________________  
____________________________________________________________________________________________  
____________________________________________________________________________________________  
____________________________________________________________________________________________  
Test Equipment Used:  
Description  
Model No.  
Trace No.  
Cal. Due Date  
1. AC Source  
_______________  
_______________  
_______________  
_______________  
_______________  
_______________  
_______________  
_______________  
_______________  
_______________  
_______________  
_______________  
_________________  
_________________  
_________________  
_________________  
_________________  
_________________  
2. DC Voltmeter  
3. RMS Voltmeter  
4. Oscilloscope  
5. Electronic Load  
6. Current Monitoring  
Shunt  
Verification 25  
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Table 2-7. Performance Test Record for Agilent Model 6680A  
MODEL Agilent _____________  
Test Description  
Report No.______________  
Date_____________________  
Minimum  
Spec.  
Results  
*
Maximum  
Spec.  
Measurement  
Uncertainty  
Constant Voltage Tests  
Voltage Programming  
and Readback  
Low Voltage (0V) Vout  
Front Panel Display Readback  
-5mV  
________mV  
+5mV  
1.6 µV  
1.6 µV  
Vout - 7.5mV  
________mV  
Vout + 7.5mV  
High Voltage (5V) Vout  
Front Panel Display Readback  
4.993V  
_________V  
_______mV  
5.007V  
56 µV  
56 µV  
Vout - 10mV  
Vout + 10mV  
Load Effect  
V
out - 0.3mV  
_______mV  
_______mV  
Vout + 0.3mV  
Vout + 0.3mV  
750 nV  
750 nV  
Source Effect  
Vout - 0.3mV  
PARD (Ripple and Noise)  
Peak-to-Peak  
RMS  
0
0
_______mV  
_______mV  
10mV  
904 µV  
150 µV  
1.5mV  
Transient Response Time  
0
_______mV  
150mV  
23mV  
(at 900 µs)  
Constant Current Tests  
Current Programming  
and Readback  
Low Current (0A) Iout  
Front Panel Display Readback  
-450mA  
_______mA  
+450mA  
15 µA  
15 µA  
I
out - 600mA  
_______mA  
Iout + 600mA  
High Current (875A) Iout  
Front Panel Display Readback  
873.675A  
_________A  
_______mA  
+876.325A  
462mA  
462mA  
I
out - 1.475mA  
Iout + 1.475mA  
PARD (Ripple and Noise)  
0
________mA  
290mA  
3.8mA  
RMS  
Load Effect  
Iout - 108mA  
________mA  
________mA  
Iout + 108mA  
Iout + 108mA  
937 µA  
937 µA  
Source Effect  
I
out - 108mA  
*Enter your test results in this column.  
26 Verification  
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Table 2-7. Performance Test Record for Agilent Model 6681A  
MODEL Agilent_____________  
Test Description  
Report No.______________  
Date_____________________  
Minimum  
Spec.  
Results  
*
Maximum  
Spec.  
Measurement  
Uncertainty  
Constant Voltage Tests  
Voltage Programming  
and Readback  
Low Voltage (0V) Vout  
Front Panel Display Readback  
-8mV  
________mV  
+8mV  
1.6 µV  
1.6 µV  
Vout - 12mV  
________mV  
Vout + 12mV  
High Voltage (8V) Vout  
Front Panel Display Readback  
7.988V  
_________V  
_______mV  
8.011V  
88 µV  
88 µV  
Vout - 16mV  
Vout + 16mV  
Load Effect  
V
out - 0.5mV  
_______mV  
_______mV  
Vout + 0.5mV  
Vout + 0.5mV  
900 nV  
900 nV  
Source Effect  
Vout - 0.5mV  
PARD (Ripple and Noise)  
Peak-to-Peak  
RMS  
0
0
_______mV  
_______mV  
10mV  
904 µV  
150 µV  
1.5 mV  
Transient Response Time  
0
_______mV  
150mV  
23mV  
(at 900 µs)  
Constant Current Tests  
Current Programming  
and Readback  
Low Current (0A) Iout  
Front Panel Display Readback  
-300mA  
_______mA  
+300mA  
15mA  
15mA  
I
I
out -400mA  
_______mA  
Iout +400mA  
High Current (580A) Iout  
Front Panel Display Readback  
579.120A  
_________A  
________A  
+580.880A  
311mA  
311mA  
out -980mA  
Iout + 980mA  
PARD (Ripple and Noise)  
RMS  
0
________mA  
________mA  
190mA  
3.8mA  
Load Effect  
Iout - 69mA  
out - 69mA  
Iout +69mA  
790 µA  
Source Effect  
I
________mA  
Iout + 69mA  
790 µA  
*Enter your test results in this column.  
Verification 27  
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Table 2-7. Performance Test Record for Agilent Model 6682A  
MODEL Agilent_____________  
Test Description  
Report No.______________  
Date_____________________  
Minimum  
Spec.  
Results  
*
Maximum  
Spec.  
Measurement  
Uncertainty  
Constant Voltage Tests  
Voltage Programming  
and Readback  
Low Voltage (0V) Vout  
Front Panel Display Readback  
-21mV  
________mV  
+21mV  
1.7 µV  
1.7 µV  
Vout - 32mV  
________mV  
Vout + 32mV  
High Voltage (21V) Vout  
Front Panel Display Readback  
20.970V  
_________V  
_______mV  
21.029V  
347 µV  
347 µV  
Vout -42mV  
Vout + 42mV  
Load Effect  
V
out - 1mV  
_______mV  
_______mV  
Vout + 1mV  
Vout +1mV  
20 µV  
20 µV  
Source Effect  
Vout - 1mV  
PARD (Ripple and Noise)  
Peak-to-Peak  
RMS  
0
0
_______mV  
_______mV  
10mV  
904 µV  
150 µV  
1.75 mV  
Transient Response Time  
(at 900 µs)  
0
_______mV  
150mV  
23 µV  
Constant Current Tests  
Current Programming  
and Readback  
Low Current (0A) Iout  
Front Panel Display Readback  
-125mA  
_______mA  
+125mA  
1.5mA  
1.5mA  
I
I
out - 165mA  
_______mA  
Iout + 165mA  
High Current (240A) Iout  
Front Panel Display Readback  
239.635A  
_________A  
_______mA  
+240.365A  
84mA  
84mA  
out - 405mA  
Iout + 405mA  
PARD (Ripple and Noise)  
RMS  
0
________mA  
________mA  
80mA  
0.8mA  
Load Effect  
Iout - 24mA  
out - 24mA  
Iout + 24mA  
172 µA  
Source Effect  
I
________mA  
Iout + 24mA  
172 µA  
*Enter your test results in this column.  
28 Verification  
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Table 2-7. Performance Test Record for Agilent Model 6683A  
MODEL Agilent_____________  
Test Description  
Report No.______________  
Date_____________________  
Minimum  
Spec.  
Results  
*
Maximum  
Spec.  
Measurement  
Uncertainty  
Constant Voltage Tests  
Voltage Programming  
and Readback  
Low Voltage (0V) Vout  
Front Panel Display Readback  
-32mV  
________mV  
+32mV  
1.9 µV  
1.9 µV  
Vout - 48mV  
________mV  
Vout + 48mV  
High Voltage (32V) Vout  
Front Panel Display Readback  
31.995V  
_________V  
_______mV  
32.044V  
488 µV  
488 µV  
Vout - 64mV  
Vout + 64mV  
Load Effect  
V
out - 1.7mV  
_______mV  
_______mV  
Vout + 1.7mV  
Vout + 1.7mV  
26 µV  
26 µV  
Source Effect  
Vout - 1.7mV  
PARD (Ripple and Noise)  
Peak-to-Peak  
RMS  
0
0
_______mV  
_______mV  
10mV  
904 µV  
150 µV  
2.0mV  
Transient Response Time  
(at 900 µs)  
0
_______mV  
150mV  
23 µV  
Constant Current Tests  
Current Programming  
and Readback  
Low Current (0A) Iout  
Front Panel Display Readback  
-85mA  
_______mA  
+85mA  
1.5mA  
1.5mA  
I
I
out - 110mA  
_______mA  
Iout + 110mA  
High Current (160A) Iout  
Front Panel Display Readback  
159.755A  
_________A  
_______mA  
+160.245A  
36mA  
36mA  
out - 270mA  
Iout + 270mA  
PARD (Ripple and Noise)  
0
________mA  
55mA  
0.56mA  
RMS  
Load Effect  
Iout - 18mA  
out - 18mA  
________mA  
________mA  
Iout + 18mA  
Iout + 18mA  
148 µA  
148 µA  
Source Effect  
I
*Enter your test results in this column.  
Verification 29  
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Table 2-7. Performance Test Record for Agilent Model 6684A  
MODEL Agilent_____________  
Test Description  
Report No.______________  
Date_____________________  
Minimum  
Spec.  
Results  
*
Maximum  
Spec.  
Measurement  
Uncertainty  
Constant Voltage Tests  
Voltage Programming  
and Readback  
Low Voltage (0V) Vout  
Front Panel Display Readback  
-40mV  
________mV  
+40mV  
2 µV  
2 µV  
Vout - 60mV  
________mV  
Vout + 60mV  
High Voltage (40V) Vout  
Front Panel Display Readback  
39.944V  
_________V  
_______mV  
40.056V  
590 µV  
590 µV  
Vout - 80mV  
Vout + 80mV  
Load Effect  
V
out - 2.3mV  
_______mV  
_______mV  
Vout + 2.3mV  
Vout + 2.3mV  
30 µV  
30 µV  
Source Effect  
Vout -2.3mV  
PARD (Ripple and Noise)  
Peak-to-Peak  
RMS  
0
0
_______mV  
_______mV  
10mV  
904 µV  
150 µV  
2.5mV  
Transient Response Time  
(at 900 µs)  
0
_______mV  
150mV  
23 µV  
Constant Current Tests  
Current Programming  
and Readback  
Low Current (0A) Iout  
Front Panel Display Readback  
-65mA  
_______mA  
+65mA  
1.5mA  
1.5mA  
I
out - 90mA  
_______mA  
Iout + 90mA  
High Current (128A) Iout  
Front Panel Display Readback  
127.807A  
_________A  
_______mA  
+128.193A  
24mA  
24mA  
I
out - 218mA  
Iout + 218mA  
PARD (Ripple and Noise)  
0
________mA  
45mA  
0.23mA  
RMS  
Load Effect  
Iout - 15mA  
out - 15mA  
________mA  
________mA  
Iout + 15mA  
Iout + 15mA  
138mA  
138mA  
Source Effect  
I
*Enter your test results in this column.  
30 Verification  
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3
Troubleshooting  
Shock Hazard: Most of the procedures in this chapter must be performed with power applied and  
protective covers removed. These procedures should be done only by trained service personnel aware of  
the hazard from electrical shock.  
This instrument uses components that can be damaged or suffer serious performance degradation due to  
ESD (electrostatic discharge). Observe standard antistatic precautions to avoid damage to the  
components (see Chapter 1).  
Introduction  
Localizing the Problem  
This chapter provides troubleshooting and repair information for the power supply. Before beginning troubleshooting  
procedures, make certain the problem is in the power supply and not with an associated circuit, the GPIB controller (for  
GPIB system power supplies), or ac input line. Without removing the covers, you can use the Verification tests in Chapter 2  
to determine if the power supply is operating normally.  
Chapter Organization  
The information in this chapter is organized as follows:  
Topic  
Information Given  
Test Equipment Required  
Troubleshooting Procedures  
Equipment required for completing all the tests in this chapter.  
A series of flow charts for systematic location of defective boards, circuits, and  
components. An explanation of the error codes and messages generated during the  
power-on selftest. Signature analysis techniques for troubleshooting the digital circuits  
on the front panel, primary GPIB, and secondary interface circuits. Specific  
paragraphs for:  
•
•
•
Checking the bias and reference supplies.  
Troubleshooting the CV/CC status annunciators.  
Troubleshooting the A3 FET board.  
Post-Repair Adjustments  
Disassembly Procedures  
Calibration and EEPROM initialization procedures required after the replacement of  
certain critical components.  
Gaining access to and/or replacing components.  
Troubleshooting 31  
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Test Equipment Required  
Table 3-1. Test Equipment Required  
Equipment  
Logic Probe  
Test Clips  
Purpose  
To check states of data lines.  
To gain access to IC pins.  
To measure output current.  
Recommended Model  
Agilent 545A  
AP Products No. LTC  
Agilent 6680A & 6681A:  
Burster 1280  
Ammeter/Current Shunt  
Agilent 6682A, 6683A & 6684A:  
Guildline 9230/300  
Agilent 54504A  
Oscilloscope  
Signature Analyzer  
To check waveforms and signal levels.  
To troubleshoot most of the primary  
and secondary interface circuits.  
Agilent 5005A/B  
GPIB Controller  
DC Voltmeter  
To communicate with power supply via Agilent BASIC series  
the GPIB (for system units).  
To measure output voltage and current, Agilent 3458A  
bias and references.  
Troubleshooting Procedures  
Power-On Selftest  
Description  
The procedures in the troubleshooting charts make use of the power-on selftest. The power-on selftest tests the front panel,  
GPIB interface (for GPIB system power supplies), and secondary interface circuits. If the power supply fails the selftest, the  
output remains disabled (turned off) and the front panel normally displays an error code or message (see Table 3-2). The  
message is displayed indefinitely and the power supply will not accept GPIB or front panel commands.  
Disabling The Power-On Selftest  
In order to perform troubleshooting procedures that require programming of the power supply, you must disable the  
power-on self test. Do this as follows:  
1. Turn off the power supply.  
2. Hold down the  
key and turn on the supply.  
3. Continue holding down the  
for 2 seconds and wait until the PWR ON INIT indicator goes off.  
4. The power supply is now on without executing power-on selftest.  
Using the *TST? Query (GPIB Systems Supplies Only)  
You can get the power supply to execute a partial selftest by sending it the GPIB *TST? query command. Table 3-2 shows  
the tests that are performed in response to this command. These tests do not interfere with normal operation or cause the  
output to change. The command returns a value of "0" if all tests pass. Otherwise, the command returns the error code of  
the first test that failed. No error codes are displayed on the front panel and the power supply will attempt to continue  
normal operation.  
32 Troubleshooting  
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Table 3-2. Selftest Error Codes/Messages  
Code and/or  
Message  
El FP RAM  
Description  
Probable Cause Selftest Error  
Codes/Messages  
Microprocessor AlU3  
ROM AlU4 or address latches AlU8  
Front panel RAM test failed (power-on).  
E2 FP ROM  
Front panel ROM test failed (power-on  
and *TST?).  
E3 EE CHKSM  
Front panel EEPROM checksum test failed Possibly due to power loss during a write  
(power-on and *TST?).  
operation. See Checksum Errors in Chapter 3 of  
Operating Manual. If power loss is not the problem,  
EEPROM A1U6 could be defective. (If you replace  
AlU6, the power supply must be reinitialized and  
calibrated.)  
E4 PRI XRAM  
E5 PRI IRAM  
E6 PRI ROM  
Primary interface external RAM test failed RAM A2U108  
(power-on).  
Primary interface internal RAM test failed  
(power-on).  
Microprocessor A2U114  
Primary interface ROM test failed  
(power-on and *TST?).  
ROM A2U106  
E7 GPIB  
GPIB interface test failed (power-on).  
Talker/listener A2U117  
Microprocessor Al0U506  
E8 SEC RAM  
Secondary interface RAM test failed  
(power-on).  
E9 SEC ROM  
E10 SEC 5V  
Secondary interface ROM test failed  
(power-on and *TST?).  
Secondary interface 5 volt readback test  
failed (power-on and *TST?).  
Microprocessor Al0U506  
Comparators Al0U516, Al0U517 readback DAC  
A10U512/U515, or secondary bias supply (5Vs  
A4U304)  
E11 TEMP  
E12 DACS  
Ambient temperature readback test failed  
(power-on and *TST?).  
CV or CC DAC tests failed (power-on).  
Thermistor Al0RT500 or comparator  
Al0U517  
CV DAC Al0U510/U513 or CC DAC  
A10U511/U514 (see Figure 3-7).  
NOTE: The following error messages can appear due to a failure occurring either while the power supply is operating or  
during selftest.  
SERIAL TIMOUT  
SERIAL DOWN  
UART PARITY  
Serial data line failure on A2 board.  
Serial data line failure on A2 board.  
UART failed.  
See Figure 3-10 (system) or Figure 3-11 (bench).  
See Figure 3-10 (system) or Figure 3-11 (bench).  
UART A2U112  
UART FRAMING  
UART OVERRUN  
SBUF OVERRUN  
UART failed.  
UART A2U112  
UART failed.  
UART A2U112  
Serial buffer failure UART.  
UART A2U112 defective or GPIB board is in SA  
mode  
SBUF FULL  
Serial buffer failure.  
UART A2U112 defective or GPIB board is in SA  
mode  
EE WRITE ERR  
EEPROM write failure.  
EEPROM AlU6 defective or calibration error  
SECONDARY DN  
Serial data line failure on Main board.  
See Figure 3-12.  
Troubleshooting 33  
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Troubleshooting Charts  
Figure 3-1 gives overall troubleshooting procedures to isolate the fault to a circuit board or particular circuit (see Figure  
3-20 for the location of the circuit boards). These procedures include the use of power-on selftest (Table 3-2) and signature  
analysis techniques (Table 3-5 through Table 3-7). Some results of Figure 3-1 lead to more detailed troubleshooting charts  
that guide you to specific components. The troubleshooting charts are organized as follows:  
Chart  
Figure 3-1  
Trouble or Circuit  
Overall procedure checks selftest errors, calibration errors, ac input circuit, fan, readback  
circuits, A10 Control Board, GPIB cable, digital port, serial link, rotary controls, current  
amplifier.  
Figure 3-2  
No display (from Figure 3-1).  
Figure 3-3  
Figure 3-4  
OV circuit not firing (from Figure 3-1).  
OV circuit is on at turn on (from Figure 3-1).  
Figure 3-5  
Figure 3-6  
Output level is held low (from Figure 3-1).  
Output level is held high (from Figure 3-1).  
Figure 3-7  
Figure 3-8  
Figure 3-9  
Figure 3-10  
Figure 3-11  
Figure 3-12  
DAC circuits (from Figure 3-1).  
DAC test waveforms.  
CV and CC DAC and amplifiers (from Figure 3-1).  
Serial Down circuit (from Figure 3-1).  
Secondary interface circuit (from Figure 3-1).  
Slow downprogramming circuit (from Figure 3-1).  
Troubleshooting Test Points  
The troubleshooting charts reference test points listed in Table 6-3 of Chapter 6. Test points are identified by an encircled  
number (such as U in schematic diagrams and component location drawings, also in Chapter 6).  
Bias and Reference Supplies  
Many of the following troubleshooting procedures begin by checking the bias and/or reference voltages. Table 6-3 lists the  
test points for these voltages and gives the correct reading for each. The circuit board component location diagrams identify  
these points on each board.  
34 Troubleshooting  
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Figure 3-1. Overall Troubleshooting (Sheet 1 of 4)  
Troubleshooting 35  
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Figure 3-1. Overall Troubleshooting (Sheet 2 of 4)  
36 Troubleshooting  
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Figure 3-1. Overall Troubleshooting (Sheet 3 of 4)  
Troubleshooting 37  
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Figure 3-1. Overall Troubleshooting (Sheet 4 of 4)  
38 Troubleshooting  
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Figure 3-2. No Display Troubleshooting  
Troubleshooting 39  
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Figure 3-3. OV Will Not Fire Troubleshooting  
40 Troubleshooting  
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Figure 3-4. OV At Turn-On Troubleshooting  
Troubleshooting 41  
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Figure 3-5. Output Held Low Troubleshooting (Sheet 1 of 2)  
42 Troubleshooting  
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Figure 3-5. Output Held Low Troubleshooting (Sheet 2 of 2)  
Troubleshooting 43  
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Figure 3-6. Output Held High Troubleshooting  
44 Troubleshooting  
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Figure 3-7. DAC Circuits Troubleshooting  
Troubleshooting 45  
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Figure 3-8. DAC Test Waveforms  
46 Troubleshooting  
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Figure 3-9. CV/CC DAC and Amplifier Circuit Troubleshooting  
Troubleshooting 47  
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Figure 3-10. Serial Down Troubleshooting (Sheet 1 of 2)  
48 Troubleshooting  
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Figure 3-10. Serial Down Troubleshooting (Sheet 2 of 2)  
Troubleshooting 49  
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Figure 3-11. Secondary Interface Down (Sheet 1 of 2)  
50 Troubleshooting  
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Figure 3-11. Secondary Interface Down (Sheet 2 of 2)  
Troubleshooting 51  
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Figure 3-12. Slow Downprogramming Troubleshooting  
52 Troubleshooting  
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CV/CC Status Annunciators Troubleshooting  
When troubleshooting the CV/CC status annunciators or status readback circuits, first measure the voltage drop across the  
gating diodes, which are Al0D651 for the CC circuit and Al0D652 for the CV circuit (see A10, Sheet 2). A conducting  
diode indicates an active (ON) control circuit. This forward drop is applied to the input of the associated status comparator  
(A10U502) and drives the output low. The low signal indicates an active status which is sent to the secondary  
microprocessor A10U506 via Programmed GAL Al0U505 (see schematic Sheet 1). The front panel CV annunciator lights  
when the CV mode is active (CV is low) and the CC annunciator lights when the CC mode is active (CC is low). If neither  
is active, the UNREGULATED (Unr) annunciator comes on.  
A3 FET Board Troubleshooting  
Because test points on the FET board are not accessible when the board is installed, troubleshooting must be performed  
with the board removed from the power supply. Both static (power removed) and dynamic (power applied) troubleshooting  
procedures are provided. The location of different test points are shown by encircled numbers on the A3 FET Board  
schematic and component location diagrams (see Chapter 6). There are two isolated FET bridge assemblies (see schematic  
in Fig. 6-10 sheets 1 and 2). Test each FET bridge individually.  
Note  
If any power FET (Q201-204, Q301-304, Q211, Q311, Q222, Q322, Q233, Q333, Q244, Q344) is  
defective, you must replace all eight with a matched set.  
Table 3-4. FET Troubleshooting Chart  
Procedure  
Result  
Static Troubleshooting  
1. Turn the power supply off and remove the A3 FET board with its heatsink assembly  
attached (see "Disassembly Procedures").  
2. Measure the resistance between the + Rail (E202 & E302) and the - Rail ( E201 &  
E301).  
≥ 20MΩ.  
>15KΩ.  
3. Measure the resistance between the gate of each FET  
(Q201-204, Q211, Q222, Q233, Q244, and Q301-304, Q311, Q322, Q333, and Q344) and  
common (-Rail).  
4. Measure the resistance across capacitor C201 & C301.  
≈ 150Ω.  
5. Measure the resistance across the 15V bias input (E206 to E207 and E306 to E307).  
≈ 1KΩ in the forward  
direction and 490Ω in the  
reverse direction.  
Continue with Dynamic Troubleshooting on the next page  
Troubleshooting 53  
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Table 3-4. FET Troubleshooting Chart (continued)  
Procedure  
Result  
Dynamic Troubleshooting  
1. Turn off the power supply and remove the A3 FET Board with its heat sink  
assembly.  
See "Disassembly Procedures"  
2. Short the collectors of Q251 and Q253 or Q351 and Q353 by connecting the  
collector (case) of each transistor to common ( E507) .  
3. Connect waveform generator to J200-1 and J200-2.  
4. Set generator to produce a 20 kHz, 20V p-p triangular waveform  
See Figure 3-14A.  
5. Connect 15V from an external supply to E206 or E306 (positive) and E207 or  
E307 (common).  
e: All of the following measurements are taken with respect to E207/E307 common,  
test point  
on A3 FET Board schematic diagram  
+5V  
6. Check bias voltage at U203-1/U303-1  
.
7. While adjusting the external 15V supply input, check the bias trip point at  
U204-1/U304-1  
Voltage goes from low (0V) to high  
(5V) at an input of approximately  
12V; and from high to low at an  
input of approximately 13V.  
See Figure 3-14B.  
.
8. Set external supply input to + 15V and check drive 1 waveform at  
U201-10/U301-l0 and drive 2 waveform at U201-12/U301-12  
.
See Figure 3-14C.  
9. Check that pulses are present at U201-1  
U302-1, U202-1 , U202-7/U302-7  
, U201-7/U301-7  
.
and  
10. Pulses should be present on both sides of inductors L201-204 or L301-304 and  
L213-216 or L313-316 as follows:  
Check the pulses on the driver transistor side (Q251-Q254/Q351-Q354) of each  
inductor.  
See Figure 3-14D.  
See Figure 3-14E.  
Check the pulses on the FET regulator side (Q201-Q204, Q301-Q304, Q211, Q311,  
Q222, Q322, Q233, Q333 and Q244, Q344) of each inductor.  
If the waveforms do not have the fast step as shown in Figure 3-14, then the  
associated FET gate input has an open circuit.  
≈ 1.7V  
11. Measure the VREF voltage at U205-2  
.
All pulses turn off.  
Check the peak current limit by connecting a 68KΩ resistor from +5V (U201-9) to  
U205-3 or U304-5.  
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Figure 3-13. A3 FET Board Test Waveforms  
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Signature Analysis  
Introduction  
The easiest and most efficient method of troubleshooting microprocessor-based instruments is with signature analysis (SA).  
This technique is similar to signal tracing with an oscilloscope in linear circuits. Part of the microprocessor memory is  
dedicated to SA, and a known bit stream is generated to stimulate as many nodes as possible within a circuit. Because it is  
virtually impossible to analyze a bit stream with an oscilloscope, a signature analyzer is used to compress the bit stream  
into a four-character signature. By comparing the signatures of the IC under test to the correct signature for each node, you  
can isolate faults to one or two components .  
The following general rules apply to signature analysis testing:  
1. Be sure to use the correct test setup connections for the specific test.  
2. When examining an IC, note the correct signatures for Vcc (+5V) and for common. If an incorrect signature matches  
either one, it probably indicates a short to that part of the circuit.  
3. If two IC pins have identical signatures, they are probably shorted.  
4. If two IC signatures are similar, it is only a coincidence.  
5. If an input pin of an IC has an incorrect signal but the signal source (output of the previous IC) is correct, then look for  
an open printed circuit track or soldering problems.  
6. If the output signature of an IC is incorrect, it could be caused by that IC. However, it could also be caused by a short  
at another component that is connected to that output.  
Firmware Revisions  
Each signature analysis table in this chapter shows the power supply firmware revision for which the table is valid. If  
needed, for a Bench Supply you can confirm the firmware revision of your power supply by checking the label on the Front  
panel ROM, AlU3, and on the Secondary microprocessor, A5U504. You can obtain the revisions on a Systems Supply with  
the GPIB *IDN? query command. The following sample Agilent BASIC program does this:  
10 ALLOCATE L$[52]  
20 OUTPUT 705;"*IDN?"  
30 ENTER 705;L$  
40 DISP L$  
50 END  
For a typical Model 6681A, the controller will return a string with four comma-separated fields, as follows:  
"Agilent Technologies ,6681A,O,fA.01.05sA.01.04pA.0l.02"  
The first three fields in the string are the manufacturer, model number and 0. The last field gives the firmware information  
as follows:  
f= front panel firmware revision (A.01.05).  
s= secondary interface firmware revision (A.01.04).  
p= primary interface firmware revision (A.01.02).  
Note  
The firmware revisions numbers shown here may not match the firmware revision of your instrument.  
Firmware revision numbers are subject to change whenever the firmware is updated.  
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Test Headers  
The power supply has two test headers as shown in Figure 3-15, each with a jumper that can be moved to different  
positions for SA testing and for other functions. To gain access to the headers, remove the power supply top cover.  
Pins  
Description  
Primary Interface Test Connector A2J106 (Systems Supplies Only)  
7 and 8 (FLT/INH)  
Normal operating (and storage) position. DIG CNTL port** is configured for  
fault indicator (FLT) output and remote inhibit (RI) input .  
1 and 2 (SA Mode)  
3 and 4 (DIG I/O)  
Install jumper here for SA mode.  
Install jumper here to configure DIG CNTL port** for digital I/O operation .  
5 and 6 (RELAY LINK)  
Install jumper here to configure DIG CNTL port** for control of external relay  
accessories.  
** See Appendix D in power supply Operating Manual for information about the  
digital control port.  
Front Panel Test Connector A1J3  
7 and 8 (NORM)  
Normal operating (and storage) position of jumper.  
Install jumper here for SA mode.  
1 and 2 (SA Mode)  
3 and 4 (INHIBIT CAL)  
Install jumper here to disable calibration commands and prohibit calibration.  
5 and 6 (FACTORY PRESET CAL)  
Install jumper here to restore original factory calibration constants.  
Figure 3-14. Test Header Jumper Positions  
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Table 3-5. Primary Interface SA Test  
Description: These signatures check some primary interface circuits on the Systems Supply A2 GPIB Board.  
Valid A2U106 ROM Firmware Revision: A.01.06  
Test Setup: See Figure 3-17.  
1. Turn off the power supply and remove the top cover.  
2. Connect SA jumper of connector J106 on A2 GPIB Board (see Figure 3-15).  
3. Connect signature analyzer CLOCK, START, STOP, and GROUND inputs as show in Figure 3-16 .  
4. Turn on the power supply and use the signature analyzer probe to take the following signatures:  
Power:  
5V = 9FFP  
Serial Link: A2U109-3 = 0104  
Microprocessor: A2U114-24 = 9FFP  
A2U114-25 = UF39  
Digital Control Interface: A2U118-1 = 9AF1  
A2U118-9 = 40A5  
A2U118-10 = 1029  
A2U118-15 = 0010  
A2U118-16 = 040A  
Gated Array Logic: A2U119-2 = 0A55  
A2U119-5 = 0040  
A2U119-15 = 0040  
5. After completing the tests, be sure to return the J106 jumper to its original position.  
Figure 3-15. Signature Analysis Signal Inputs  
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Figure 3-16. Signature Analysis Connections, (Sheet 1 of 2)  
Troubleshooting 59  
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Figure 3-16. Signature Analysis Connections, (Sheet 2 of 2)  
Table 3-6. Front Panel SA Test  
Description: These signatures check front panel microprocessor AlU3.  
Valid A1U4 ROM Firmware Revision: A.01.07  
Test Setup: See Figure 3-17.  
1
.Turn off the power supply and remove the top cover.  
2. To gain access to A1 Front Panel Board, perform steps 1 and 2 of the disassembly procedure for A1 Front Panel  
Assembly (see "Disassembly Procedures").  
3. Connect SA jumper of connector J3 on A1 Front Panel Board (see Figure 3-15).  
4. Connect signature analyzer CLOCK, START, STOP, and GROUND inputs and setup as shown in Figure 3-16.  
5. Turn on the power supply and use the signature analyzer probe to take the following signatures:  
Power:  
5V = 3395  
Microprocessor:  
AlU3-15 = 3395  
AlU3-19 = 552U  
AlU3-20 = 954C  
AlU3-21 = A552  
AlU3-22 = 2954  
AlU3-23 = 0A55  
AlU3-24 = 3395  
AlU3-25 = 3395  
AlU3-26 = 0000  
AlU3-27 = 0000  
AlU3-28 = 40A5  
A1U3-29 = 1029  
AlU3-30 = 0295  
AlU3-31 = 0000  
AlU3-32= 3395  
AlU3-33 = 0008  
AlU3-34 = 040A  
AlU3-35 = 0102  
AlU3-38 = 0002  
AlU3-39 = 0020  
AlU3-42 = 3395  
6. After completing the tests, be sure to return the J3 jumper to its original position.  
60 Troubleshooting  
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Table 3-7. Secondary Interface SA Test  
Description: These signatures check the secondary microprocessor A5U504.  
Valid A5U504 ROM Firmware Revision: A.01.04  
Test Setup: See Figure 3-17.  
1. Turn off the power supply and remove the top cover.  
2. To obtain a setup that allows access to components and test points on the A5 Control Board, follow the procedure  
given in Table 3-3 under "A5 Control Board Setup".  
3. Connect signature analyzer CLOCK, START, STOP, and GROUND inputs and setup as shown in Figure 3-15.  
4. To place the secondary interface in the SA mode, turn on the power supply while momentarily (for 2 seconds) shorting  
A5U504-1 to A5U504-20 (common).  
5. Use the signature analyzer probe to take the following signatures:  
Power:  
5V = lC4C  
Microprocessor:  
A5U504-1 = F77H  
A5U504-2 = C98P  
A5U504-3 = 1573  
A5U504-4 = P42A  
A5U504-5 = UHF8  
A5U504-6 = F5UC  
A5U504-7 = UH8C  
A5U504-8 = 23UC  
A5U504-9 = 0000  
A5U504-10 = IC4C  
A5U504-11 = lC4C  
A5U504-12 = C76F  
A5U504-13 = U042  
A5U504-14 = 2189  
A5U504-15 = lC4C  
A5U504-16 = lC45  
A5U504-17 = 0010  
A5U504-18 = IC4C  
A5U504-19 = lC4C  
A5U504-20 = 0000  
A5U504-21 = 0C98  
A5U504-22 = 5PC7  
A5U504-23 = 0000  
A5U504-24 = 6CAP  
A5U504-25 = A339  
A5U504-26 = A319  
A5U504-27 = A339  
A5U504-28 = 0C98  
A5U504-29 = lC4C  
A5U504-30 = 0000  
A5U504-31 = lC4C  
A5U504-32 = 0000  
A5U504-33 = 0000  
A5U504-34 = lC47  
A5U504-35 = 0000  
A5U504-36 = 0UPU  
A5U504-37 = UF7P  
A5U504-38 = 347F  
A5U504-39 = CP47  
A5U504-40 = lC4C  
6. After completing the tests, be sure to return the J3 jumper to its original position.  
Note  
After completing this test, you can exit the SA mode only by performing a power-on reset.  
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Post-Repair Calibration  
When Required  
Calibration is required annually and also whenever certain components are replaced. If components in any of the circuits  
listed below are replaced, the supply must be recalibrated.  
Note  
For calibration procedures, see Appendix A of the Operating Manual.  
Location  
Component  
A10 Control Board  
CV/CC DACs/operational amplifiers, CV/CC control circuit amplifiers, readback  
DAC/operational amplifier, readback comparators.  
A1 Front Panel Assy  
A1 Front Panel Board or EEPROM AlU6.  
Note: If either of these front panel components is replaced, the power supply must first be  
reinitialized before calibration (see "EEPROM Initialization" ) .  
Inhibit Calibration Jumper  
If CAL DENIED appears on the display when front panel calibration is attempted (or error code 1 occurs when GPIB  
calibration is attempted on a Systems Supply), the INHIBIT CAL jumper (see Figure 3-15) is installed. This prevents the  
power supply calibration from being changed. To calibrate the power supply first move this jumper from the INHIBIT CAL  
position to the NORM position.  
Calibration Password  
In order to enter the calibration mode, you must use the correct password as described in Appendix A of the Operating  
Manual. As shipped from the factory, the supply's model number (e.g., "6681") is the password. If you use an incorrect  
password, PASSWD ERROR appears on the display during front panel calibration, or error code 2 occurs during GPIB  
calibration, and the calibration mode is disabled. If you do not know the password, you can recover the calibration function  
by restoring the preset factory calibration constants as described below.  
Restoring Factory Calibration Constants  
This procedure allows you to recover the factory calibration constants. The ability to do this allows you to operate the  
power supply for troubleshooting and/or to recalibrate it as required. To restore the original factory calibration constants,  
proceed as follows:  
1.  
2.  
Turn off the supply and remove the top cover.  
Move the jumper in test header J3 on the A1 Front Panel Board from the NORM to the FACTORY PRESET CAL  
position (see Figure 3-15).  
3.  
4.  
Turn on the power supply and note that ADDR 5 and then PWR ON INIT appear briefly on the front panel display.  
When PWR ON INIT no longer appears, the supply's factory calibration constants have been restored and the password  
has been changed to 0. There is no longer any password protection. You can now turn off the supply and restore the  
calibration jumper to the NORM position (see Figure 3-15).  
5.  
Turn on the supply. You may now set a new password (if desired) and recalibrate the power supply.  
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EEPROM Initialization  
EEPROM AlU6 on the A1 Front Panel Board stores the supply's GPIB address, model number, and constants required to  
program and calibrate the power supply. If either the front panel board or the EEPROM is replaced, the power supply must  
be reinitialized with the proper constants by running the program listed in Figure 3-18.  
When the program pauses and asks you to make a selection, respond as follows:  
Initialization (I) or Factory Preset Replacement (F)? I  
After the power supply has been initialized, it must be calibrated as described in Appendix A of the Operating Manual.  
After calibration, transfer the new calibration constants to the EEPROM's "Factory Cal" locations as described next.  
Transferring Calibration Constants To Factory Preset Locations  
A newly initialized and calibrated power supply has calibration constants in operating locations but does not have the new  
factory calibration constants stored in EEPROM. This procedure transfers the calibration constants into the EEPROM  
FACTORY PRESET CAL locations by running the program listed in Figure 3-18.  
When the initialization program pauses and asks you to make a selection, respond as follows:  
Initialization (I) or Factory Preset Replacement (F)? F  
The new calibration constants will then be stored. Pre-initialized and tested A1 Front Panel boards are available for Analog  
Programmable "bench" series supplies. (See Chapter 5, Table 5-4 for part numbers.)  
A Bench Series Supply can be initialized and the new Factory Preset calibration constants loaded by temporarily replacing  
the A2 Isolator board with an A2 GPIB board. Then follow the instructions above for "EEPROM INITIALIZATION" and  
also "TRANSFERRING CALIBRATION CONSTANTS TO THE FACTORY PRESET LOCATIONS" described above.  
After the supply has been Initialized, Calibrated, and the new Factory Presets stored, remove the GPIB board and reinstall  
the original Isolator board.  
Troubleshooting 63  
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10  
20  
30  
40  
50  
60  
70  
80  
90  
100  
!
!
!
!
!
Program to initialize EPROM or move factory preset data in 668xA  
power supplies.  
RE-STORE " INIT_668X"  
Rev A.00.00 dated 09 Nov 1993  
DIM Init_data(1:49),Model$[5],Idn$[21],Cal_data$[40]  
INTEGER Addr(1:49),Length(1:49)  
ASSIGN @Ps TO 705  
! Supply must be at address 705  
CLEAR SCREEN  
!
110 Eprom_data_addr:  
! Data address  
120  
130  
140  
150  
160  
170  
DATA 2,6,10,14,18,19,20,24,28,32  
DATA 36,37,38,42,46,50,54,55,56,57  
DATA 64,68,72,76,80,116,l52,153,154,155  
DATA l56,158,160,162,163,164,165,166,167,168  
DATA 169,170,171,172,174,176,180,184,188  
!
180 Eprom_data_len:  
! Data for word length  
! EEPROM data for 6680A  
! EEPROM data for 6681A  
! EEPROM data for 6682A  
! EPROM data for 6683A  
190  
200  
210  
220  
230  
240  
DATA 4,4,4,4,1,1,4,4,4,4  
DATA 1,1,4,4,4,4,1,1,1,1  
DATA 4,4,4,4,4,1,1,1,1,1  
DATA 2,2,2,1,1,1,1,1,1,1  
DATA 1,1,1,2,1,4,4,4,4  
!
250 Eprom_data_6680:  
!
260  
270  
280  
290  
300  
310  
DATA 729,71,5.125,0,83,0,4.235,72,895,0  
DATA 98,3,36,17,6.25,0,83,255,20,10  
DATA 6680,708,94,4.13,92,128,5,255,0,0  
DATA 1296,6680,0,20,180,20,180,175,33,98  
DATA 115,30,20,1,58,.002701,.2,.0017346,10.2286  
!
320 Eprom_data_6681:  
!
330  
340  
350  
360  
370  
380  
DATA 463,75,8.19,0,83,0,6.333,70,592,0  
DATA 98,3,22.16,17.75,10.0,0,,83,255,20,10  
DATA 6681,430,95,6.3645,92,128,5,255,0,0  
DATA 1296,6681,0,20,180,20,180,175,33,98  
DATA 115,30,20,1,58,.002701,.2,.0017346,10.2286  
!
390 Eprom_data_6682:  
!
400  
410  
420  
430  
440  
450  
DATA 175,74,21.5,0,83,0,15,73,246,0  
DATA 98,21,8.7,10,26.3,0,83,255,20,10  
DATA 6682,162,96,15,96,128,5,255,0,0  
DATA 1296,6682,0,20,180,20,180,175,33,98  
DATA 115,30,20,1,127,.002701,.2,.000307,10.25  
!
460 Eprom_data_6683: !  
470  
480  
490  
500  
DATA 116,74,32.8,0,83,0,23,75,164,0  
DATA 98,21,5.5,10,40.0,0,83,255,20,10  
DATA 6683,108,96,23,97,128,5,255,0,0  
DATA 1296,6683,0,20,180,20,180,175,33,98  
Figure 3-17. Initialization and Factory Preset Replacement Program Listing (Sheet 1 of 5)  
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510  
520  
DATA 115,30,20,1,127,.002701,.2,.00042,10.25  
!
530 Eprom_data_6684: !  
DATA 93,74,41,0,83,0,29,70,131,0  
! EEPROM data for 6684A  
540  
550  
560  
570  
580  
590  
600  
610  
620  
630  
640  
650  
660  
670  
680  
690  
700  
710  
720  
730  
740  
750  
760  
770  
780  
790  
800  
810  
820  
830  
840  
850  
860  
870  
880  
890  
900  
910  
920  
930  
940  
950  
960  
970  
980  
990  
1000  
1010  
DATA 98,21,4.6,10,50,0,83,255,20,10  
DATA 6684,87,97,28,93,128,5,255,0,0  
DATA 1296,6684,0,20,180,20,180,175,33,98  
DATA 115,30,20,1,127,.002701,.2,.000333,10.234375  
!
!
INPUT “Input Power Supply model number. Example:""6681A""",Model$  
CLEAR SCREEN  
!
RESTORE Eprom_data_addr  
!
FOR I=l T0 49  
READ Addr(I)  
NEXT I  
!
RESTORE Eprom_data_len  
!
FOR I=l T0 49  
READ Length(I)  
NEXT I  
!
SELECT TRIM$(UPC$(Model$))  
CASE "6680A"  
RESTORE Eprom_data_6680  
CASE "6681A"  
RESTORE Eprom_data_6681  
CASE "6682A"  
RESTORE Eprom_data_6682  
CASE "6683A"  
! Delete leading/trailing zeros and set to uppercase  
RESTORE Eprom_data_6683  
CASE "6684A"  
RESTORE Eprom_data_6684  
!
CASE ELSE  
PRINT "Model number not found. Program is for models"  
PRINT "Agilent 6680A, 6681A, 6682A, 6683A and 6684A only"  
STOP  
END SELECT  
!
FOR I=l T0 49  
READ Init_data(I)  
NEXT I  
! Read model dependent data  
!
OUTPUT @Ps;"*CLS"  
!
OUTPUT @Ps;"CAL;STATE ON,"  
!
! Clears power supply registers  
! Turn on cal mode, "0" passcode  
Figure 3-17. Initialization and Factory Preset Replacement Program Listing (Sheet 2 of 5)  
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1020  
1030  
1040  
1050  
1060  
1070  
1080  
1090  
1100  
1110  
1120  
1130  
1140  
1150  
1160  
1170  
1180  
1190  
1200  
1210  
1220  
1230  
1240  
1250  
1260  
1270  
GOSUB Ps_error  
IF Err THEN  
! Error if passcode is not "0"!  
OUTPUT @Ps;"*IDN?"  
ENTER @Ps;Idn$  
Model=VAL(Idn$[POS(Idn$,”,”)+1] )  
! Get data from model # location  
ELSE  
GOTO Start  
END IF  
!
OUTPUT @Ps;"CAL:STATE ON,";Model  
! Turn on cal mode, passcode =  
! data at model number location  
!
GOSUB Ps_error  
! Error if passcode is not same as  
! data at model # location  
IF Err THEN  
OUTPUT @Ps;"CAL:STATE ON,";Model$[l,4]  
! Turn on cal mode, passcode =  
! model #  
GOSUB Ps_error  
IF Err THEN  
PRINT "Change pass code to the power supply model # or zero then restart the program."  
STOP  
ELSE  
GOTO Start  
END IF  
END IF  
!
1280 Start:  
1290  
1300  
!
!
!
1310  
1320  
1330  
1340  
1350  
1360  
1370  
1380  
1390  
1400  
1410  
1420  
INPUT “Select Initialization (I) or Factory preset replacement (F).”,Sel$  
CLEAR SCREEN  
SELECT (UPC$(Sel$))  
CASE "I"  
GOTO Init_eeprom  
CASE "F"  
GOTO Fact_preset  
CASE ELSE  
BEEP  
! Select Initialization  
! Select install new factory data  
GOTO Start  
END SELECT  
!
1430 Init_eeprom:  
!
1440  
1450  
1460  
1470  
1480  
1490  
1500  
1510  
PRINT “Initializing EEPROM”  
!
FOR I=1 TO 49  
OUTPUT @Ps;"DIAG:EEPR '';Addr(I);'','';Length(I);'','';Init_data(I)  
NEXT I  
GOTO Cal_off  
!
!
1520 Fact_preset:  
!
Figure 3-17. Initialization and Factory Preset Replacement Program Listing (Sheet 3 of 5)  
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1530  
1540  
1550  
1560  
1570  
1580  
1590  
1600  
1610  
1620  
1630  
1640  
CLEAR SCREEN  
PRINT "This program should ONLY be completed if your power supply”  
PRINT "EEPROM has been replaced or a component that will effect"  
PRINT "the calibration AND the alignment of voltage, overvoltage"  
PRINT "and current is complete AND unit has passed the performance"  
PRINT "test.  
INPUT Cont_prog$  
IF (UPC$(Cont_prog$))< >"C" THEN GOTO Cal_off  
!
CLEAR SCREEN  
PRINT "Transferring calibration data to factory preset locations."  
!
Enter C to continue, any other key to abort.”  
1650 Fact_cal_sour:  
! Address of factory calibration data source  
1660  
1670  
DATA 2,6,68,72,20,24,76,80,150  
!
1680 Fact_cal_dest  
:
! Address of factory calibration data destination  
1690  
1700  
DATA 84,88,92,96,100,104,108,112,116  
!
1710 Fact_cal_len:  
! Length of factory calibration data  
1720  
1730  
1740  
1750  
1760  
1770  
1780  
1790  
1800  
1810  
1820  
1830  
1840  
1850  
1860  
1870  
1880  
1890  
1900  
1910  
1920  
DATA 4,4,4,4,4,4,4,4,1  
!
RESTORE Fact_cal_sour  
FOR I=1 TO 9  
READ Cal_sour_addr(I)  
NEXT I  
!
RESTORE Fact_cal_dest  
FOR I=1 T0 9  
READ Cal_dest_addr(I)  
NEXT I  
!
RESTORE Fact_cal_len  
FOR I=1 T0 9  
READ Cal_length(I)  
NEXT I  
!
FOR I=1 T0 9  
! Locations of good data  
Read good data  
! Enter good data  
OUTPUT @Ps;"DIAG:EEPR";Cal_dest_addr(I);",";Cal_length(I);”,”;Cal_data$  
! Write good data to factory preset locations  
OUTPUT @Ps;"DIAG:EEPR? ";Cal_sour_addr(I);",";Cal_length(I)  
ENTER @Ps;Cal_data$  
!
1930  
1940  
1950  
NEXT I  
!
!
1960 Cal_off  
1970  
1980  
1990  
2000  
CLEAR SCREEN  
OUTPUT @Ps;"CaL:STATE OFF"  
!
! Turn off cal mode  
! Check for errors  
GOSUB Ps_error  
Figure 3-17. Initialization and Factory Preset Replacement Program Listing (Sheet 4 of 5)  
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2010  
2020  
2030  
2040  
2050  
2060  
2070  
2080  
2090  
IF Err THEN  
PRINT "An error occurred during the EEPROM read/write, Check for"  
PRINT "programming errors. Initialization data may be incorrect."  
STOP  
END IF  
!
PRINT "Operation complete. Program stopped."  
STOP  
!
2100 Ps_error:  
! Error handling subroutine  
! Check for errors  
2110  
2120  
2130  
2140  
2150  
OUTPUT @Ps;"SYST:ERR?"  
ENTER @Ps;Err  
RETURN  
!
END  
Figure 3-17. Initialization and Factory Preset Replacement Program Listing (Sheet 5 of 5)  
Disassembly Procedures  
Shock Hazard: To avoid the possibility of personal injury, remove the power supply from service before  
removing the top cover. Turn off the ac power and disconnect the line cord, GPIB cable, load leads, and  
remote sense leads before attempting any disassembly. Any disassembly work must only be performed by  
a qualified support technician.  
Observe that the DC RAIL assembly LEDs (DS420 & DS421) are fully extinguished (no live voltages  
present) before attempting any disassembly work. Any disassembly work must only be performed by a  
qualified support technician.  
Cable connections are shown in Figure 6-2 of Chapter 6 and component part numbers are given in Chapter 5. Reassembly  
procedures are essentially the reverse of the corresponding disassembly procedures.  
Tools Required  
þ
þ
þ
þ
þ
TORX screwdriver size T-15 (for most all retaining screws).  
TORX screwdriver size T-20 (for power supply carry straps).  
Seven (7) mm metric hex driver (to remove GPIB read connector).  
Pencil, paper, and labels to make notes to aid in the reinstallation of components.  
Work at a static-free station such as a table covered with static-dissipative laminate or with a conductive table mat  
(Agilent P/N 9300-0797, or equivalent) using a conductive wrist strap where necessary, such as, Agilent P/N  
9300-0969 or 9300-0970.  
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Top Cover  
1. Remove the four screws that secure the carrying straps (two TORX 20 screws on each side). These same screws secure  
the cover to the chassis.  
2. Spread the bottom rear of the cover, and then pull the cover backwards towards the rear of the power supply to  
disengage it from the front panel.  
Shock Hazard: Hazardous voltage can exist inside the power supply even after it has been turned off.  
Check the INPUT RAIL LED (A4CR402) under the RFI shield (see Figure 3-18 end of this section for  
LED location). If the LED is on, there is still hazardous voltage inside the supply. Wait until the LED goes  
off (approximately 7 minutes after power is removed) before proceeding.  
Removing Protective RFI Shield (Galvanized Sheet Metal)  
Once you remove the top cover of the power supply, you will see the RFI galvanized sheet metal cover preventing the  
power supply from emanating RFI fields. The RFI shield covers most components and circuit boards, as well as, many of  
the chassis-mounted components. You must remove this shield in order to gain access to the inside of the power supply.  
Remove the shield as follows:  
1. There are approximately 21 screws holding the cover to the frame.  
2. There are two screws at the top of the shield that secure a retaining clip for the GPIB board. You do not need to remove  
these screws, simply loosen the screws and slide the GPIB retaining clip backwards free of the GPIB board.  
3. Remove all shield securing screws using a TORX T-15 screwdriver and save for later reinstallation .  
4. Lift the RF shield out of the chassis.  
5. When DC RAIL LEDs are extinguished, it is safe to work inside the power supply. (See Warning note above.)  
Note  
The following procedures describe the removal of most of the circuit boards within the power supply.  
Once the GPIB board is removed, you will have access to the A4 AC Input Assembly and the A5 DC Rail  
Assembly. Similarly, once the A10 control board is removed along with the Rectifier HS you will have  
access to other components and boards within the supply.  
It is recommended that when you disconnect any wires and/or cable connectors you should immediately  
label them to simplify their reinstallation later.  
GPIB Board  
To remove the GPIB board, disconnect the cables from the following connectors at the GPIB board:  
1. Disconnect the cable going to connector P101.  
2. Disconnect phone cable going to J107.  
3. Disconnect phone cable going to J107.  
4. Disconnect phone cable going to J108.  
5. Remove two (2) holding screws at read of chassis holding GPIB board in place.  
6. Using a 7 mm driver, remove the two (2) screws holding the GPIB connector at rear of chassis.  
7. The GPIB board can now be lifted out from the chassis.  
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A4 AC Input Assembly  
To remove the A4 AC Input Board first remove the GPIB board then disconnect these cables from the following connectors  
at the GPIB board:  
1. Disconnect the cables going to connector J417 and J420.  
2. Disconnect the cable going to connector J419.  
3. Remove the three (3) fuse assemblies inside rear of power supply to free the wires going to E400, E401, and E402 on  
the AC Input Board.  
4. Remove the holding screw at the center of board just to the left of the 3-phase choke.  
5. Disconnect phone cable going to J108.  
6. Slide the board to the right and lift out.  
7. Other wires going to the board can now be removed/unsoldered.  
A5 DC RAIL Assembly  
Disconnect these cables from the following connectors at the A5 DC RAIL board:  
1. Disconnect the cables going to four connectors: J430, J431, J432, and J433.  
2. Disconnect the cable going to connector J440.  
3. Remove the four (4) holding screws TORX T-15 holding the A5 DC RAIL board in place.  
4. Lift the board out and remove/desolder any other wires preventing the board from being removed.  
A6 BIAS Assembly  
Disconnect the cables from the following connectors at the A6 BIAS Assembly board:  
1. Disconnect cables from connectors J809, J821, J830, and J831 on the A6 BIAS Board.  
2. Remove two (2) holding screws at top side of board.  
3. Slide board upward until board is free of slotted standoffs. There is one of these standoffs at the top of the board and  
two at the bottom. Wiggle the board slightly to clear all three standoffs then lift the board out.  
4. Once the board is free from its restraining standoffs, you can proceed to remove/unsolder any other wires/cables as  
necessary to remove the A6 BIAS Board entirely.  
Note  
It is recommended that you label any connectors you disconnect from the A6 BIAS Board to facilitate the  
reinstallation of these cables/wires back to their correct locations later. If you should have trouble later in  
determining which cable goes to which connector during reinstallation, refer to the cabling diagram in  
Chapter 6.  
A3 FET Board  
Follow this procedure to remove the A3 FET Board:  
1. Remove the four (4) holding screws that secure the two black caps over the Rectifier HS assembly.  
2. Once these caps are removed, you can remove the Rectifier HS which faces the A3 FET Board.  
3. Disconnect two connectors, P430 and P431, at the A5 DC RAIL assembly.  
4. Disconnect two connectors P/O cable assemblies P/N 5080-2283, at the A5 DC RAIL assembly.  
5. You can now lift out the A3 FET board and remove/unsolder any other wires necessary to fully remove the A3 board.  
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A10 Control Assembly  
Disconnect the cables from the following connectors at the A10 DC RAIL board:  
1. Disconnect the ribbon cable going from to the A6 Bias board. This cable connects to J509 on the A10 board but it is  
easier to disconnect it at the A6 Bias Board.  
2. Disconnect cables from connector J507 (phone) and connectors J510, J511, J512, and J513 on the A10 Control Board.  
3. At rear of power supply, remove holding screw directly above fan. This screw holds the frame and A10 control board  
in place.  
4. At rear of power supply unplug connector DIG CNTL from A10 Control Board.  
5. Move board to the right and lift board and associated steel frame out of chassis.  
Front Panel Assembly  
1. Peel off vinyl trim (one strip on each side of front panel) to access the four screws that secure the front panel assembly  
to the chassis.  
2. Remove the four screws (two on each side) using a size T-10 TORX.  
3. Disconnect phone cable W5 from J6 on the A1 Front Panel Board.  
4. Record the color code and the location of each of the four wires connected to line switch S1.  
5. Disconnect the wires from the switch assembly.  
6. Remove the front panel assembly.  
S1 Line Switch  
1. Remove Front Panel Assembly and disconnect switch wires as described in that procedure.  
2. Release the switch locking tabs by pressing them inward against the body of the switch and removing the switch.  
A1 Front Panel Board  
1. Remove the Front Panel Assembly and disconnect the switch as described under "Front Panel Assembly".  
2. Disconnect LCD display ribbon cable W2 from J2 on the A1 Front Panel Board.  
Note  
When reinstalling the LCD ribbon cable, be sure to line up the "stripe" of the ribbon cable with pin 1  
on J2.  
3. Use a small Allen wrench (0.050") to loosen the set screws that are inset in the knobs. (These are the AlG1 and AlG2  
Voltage/Current control shafts that extend through the front panel.) Remove knobs and shaft bushings.  
Note  
Be careful not to unscrew the knob set screws too far out as they can easily fall out of the knob and  
become lost.  
4. Remove screw (if installed) that secures board to the Front Panel Assembly. The screw is located near J4 on the Front  
Panel Board.  
5. Lift tab (near J6 on front panel board) and slide left to release board from the A1 Front Panel Assembly and remove  
board.  
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A1DSP1 LCD Display  
1. Remove the A1 Front Panel Board as described in that procedure.  
2. Remove the nuts securing the LCD display to the front panel assembly and remove the LCD and attached ribbon cable  
(see CAUTION below). (When reinstalling this cable, be sure to line up the cable stripe over the LCD connector pin  
marked with a square.)  
The display connector is fragile. When removing the cable from the LCD display, carefully rock the  
cable connector back and forth while gently pulling it back.  
A1G1 and A1G2 Rotary Controls  
1. Remove the A1 Front Panel Board as described in that procedure.  
2. Remove the AlG1 and AlG2 cables from connectors A1J4 and A1J5.  
3. Remove nuts securing the AlG1 AlG2 controls to the board and remove controls.  
A1KPD Keypad  
1. Remove the A1 Front Panel Board as described in that procedure.  
2. With board removed, keypad can easily be lifted out of the Front Panel Assembly.  
Output Bus Boards A7, A81 and A9 & Chassis Components  
Note  
To remove the A7 Snubber Board, A8 Fast Sense Assembly, A9 Downprogrammer and other chassis  
mounted components, first remove the A10 Control Board frame assembly and the two Rectifier Heat  
Sinks described earlier. Once the heat sinks are removed you will have access to the A7, A8, and A9  
boards as well as other chassis mounted components.  
Should you have any difficulty in removing power supply components or boards, contact the Agilent  
Technologies Support Line for help.  
Shock Hazard: Hazardous voltage can exist inside the power supply even after it has been turned off.  
Check the INPUT RAIL LED (A4CR402) under the RFI shield (see Figure 3-18 end of this section for  
LED location). It the LED is on, there is still hazardous voltage inside the supply. Wait until the LED goes  
off (approximately 7 minutes after power is removed) before proceeding.  
72 Troubleshooting  
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Figure 3-18. Component Locations (Top Cover and RFI Shield Removed)  
Troubleshooting 73  
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Figure 3-19. 5-Inch Front Panel Frame Assembly  
74 Troubleshooting  
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Figure 3-20. 3-Inch Front Panel Frame Assembly  
Troubleshooting 75  
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Figure 3-21. Assembly A10, Exploded View  
76 Troubleshooting  
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Figure 3-22. Assembly A10, Exploded View (6680A, 6681A)  
Troubleshooting 77  
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Figure 3-23. Assembly A10, Exploded View (6682A, 6683A, 6684A)  
78 Troubleshooting  
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Figure 3-24. Three-Phase Line Choke Subchassis Wiring  
Troubleshooting 79  
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Figure 3-25. 24 Volt Fan Transformer  
80 Troubleshooting  
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4
Principles Of Operation  
Introduction  
Figure 4-3 (at the end of this chapter) is a block diagram showing the major circuits within the power supply. The power  
supply consists of the following circuits:  
•
•
•
A1 Front Panel Board ckts.  
A2 GPIB ckts.  
A10 Control Board including the secondary interface ckts, CV/CC control ckts, switching/downprogramming control  
ckts.  
•
•
•
•
Power circuits on the A4 AC Input Board.  
A3 FET Assembly ckts.  
A5 DC Rail Board ckts.  
Output bus circuits which include the A7 Snubber Board, A8 Slow Sense Board, and A9 Downprogrammer Board  
ckts.  
•
•
•
Output rectifiers and filter capacitors.  
Ferrite cores mounted on the output bus form the output filter inductors.  
A6 Bias Board supply which supplies low-voltage, low-power, bias voltages where required.  
Each block in Figure 4-3 identifies a schematic diagram in Chapter 6 where the circuits are shown in detail. You can refer  
to the component location diagrams in Chapter 6 to locate specific components mentioned in this description. Chapter 6  
also has a cabling diagram showing the circuit board interconnections.  
A2 GPIB Board  
Circuits on the A2 GPIB board provide the interface between the GPIB controller and the power supply. All  
communications between the power supply and the GPIB controller are processed by the GPIB interface and primary  
microprocessor circuits on the A2 board.  
The primary microprocessor circuits (microprocessor, U114, ROM U106, and RAM U108) decode and execute all  
instructions and control all data transfers between the GPIB controller and the Secondary Interface on the A10 Control  
Board. The primary microprocessor also processes measurement and status data received from the Secondary Interface.  
A UART (universal asynchronous receive/transmit) IC (U112) on the A2 board converts data between the primary  
microprocessor's 8-bit, parallel bus and the serial I/O port. The serial data is transferred between the primary interface and  
the secondary interface via a programmed GAL (gated array logic) IC (U119) and optical isolator ICs (U110/U111).  
These ICs isolate the primary interface circuits (referenced to earth ground) from the secondary interface circuits  
(referenced to power supply common). The GAL IC also provides a serial I/O port to the A1 Front Panel Board to enable  
front panel control of the power supply.  
A serial link interface IC (U109) on the A2 GPIB Board allows up to sixteen supplies to be connected together and  
programmed from one GPIB address. The first supply is the only supply connected directly to the GPIB controller and is  
set to the primary GPIB address. The remaining supplies are set to secondary addresses and are linked (daisy chained)  
together via the Jl/J2 phone jacks at the rear of each supply. The serial link configuration is described in the Power Supply  
Operating Manual.  
Principles Of Operation 81  
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A digital control interface on the A2 GPIB Board provides the following power supply functions:  
•
•
•
•
Relay link.  
Digital 1/0.  
Remote inhibit (INH).  
Discrete fault indicator (FLT).  
An optical isolator IC (U113) isolates the FLT output signal common from the external fault circuit common. The desired  
digital interface function is selected by placing a jumper in a header (J106) on the A2 GPIB Board. Appendix D in the  
Power Supply Operating Manual describes how to select one of these functions and how to make the appropriate external  
connections to the DIG CNTL connector on the supply's rear panel. Another jumper position on the header selects the SA  
(signature analysis) mode, which is used for troubleshooting (see Chapter 3).  
The A2 Board has a bias supply regulator IC (U121) that provides +5V (with respect to earth ground) for the primary  
interface circuits and the bias voltage for the front panel board circuits, the LCD, and the keypad. The A2 Board also has a  
line or bias voltage detector IC (U101) that generates a power clear signal (PCLR). This signal initializes certain primary  
interface and front panel circuits when normal ac line voltage is applied, and also shuts these circuits down when the line  
voltage drops below the required minimum.  
A1 Front Panel Assembly  
The power supply A1 Front Panel Assembly contains a circuit board, keypad, liquid crystal display (LCD), and the power  
on/off switch.  
The Front Panel Circuit Board A1 contains microprocessor circuits (microprocessor U3 and ROM U4) that decode and  
execute all front panel keypad commands. These are transferred to the power supply output via the serial I/O port to the A2  
board GAL (gated-array logic) IC and isolators, and to the secondary interface circuits on the A10 Control Board. The front  
panel microprocessor circuits also process power supply measurement and status data received from the serial I/O port.  
This data is displayed on the LCD.  
IC EEPROM, U6, (electrically-erasable, programmable, read-only memory) on the A1 Front Panel Board stores data and  
configuration information. This information includes calibration constants, GPIB address, the present programming  
language, and model-dependent data such as the minimum and maximum values of voltage and current.  
One of the EEPROM storage locations holds a checksum value used to verify the integrity of this EEPROM data. Access to  
the calibration data in the EEPROM is controlled by the combination of a password and jumper options on a header (J3)  
located on the A1 board (see Post-Repair Calibration in Chapter 3).  
The power supply can be calibrated manually using the front panel keys, or via the GPIB bus with SCPI (Standard  
Commands for Programmable Instruments) commands. The calibration procedure is in Appendix A of the Power Supply  
Operating Manual).  
A10 Control Board  
The A10 Control Board contains the Secondary Interface, CV/CC Control Circuits, Readback Circuits, PWM Switching  
Circuits and OV/Downprogramming Circuits. These circuits are shown schematically in the A10 Control Board schematic.  
Secondary Interface (P/O A10 Board)  
These circuits are shown in detail on the A10 Control Board schematic and include the Secondary Microprocessor (U506),  
Programmed GAL (U505), three DAC/OpAmp circuits (U510-U515), Readback Comparator circuits (U516, U517) and  
OV/Shunt DAC OpAmp circuit, (U520, U521).  
82 Principles Of Operation  
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The Secondary Microprocessor translates serial data received from the A2 board into parallel 12 bit data. The data bus is  
connected directly to the four DAC/OpAmp circuits. Under control of the lip the selected DAC converts the bus data into  
an analog signal. The DAC reference circuit (U503, U504) provides a +10V reference for the CV and CC DACs and a  
-11.6V reference for the readback DAC. Zener VR501 provides a-6.2V reference for the OV Shunt DAC.  
The CV DAC/OpAmp (U510, U513) converts the programmed voltage value from the bus or front panel into the CVPROG  
signal. CVPROG is sent to the CV Error Amp and compared with the VMON signal to control the magnitude of the output  
voltage in the CV mode. The range of CVPROG is 0 volts to -10 volts, which corresponds to the zero-to-full-scale output  
voltage range of the supply.  
The CC DAC/OpAmp (U511, U514) converts the programmed current value from the bus or front panel into the CCPROG  
signal. CCPROG is sent to the CC Error Amp and is compared with the IMON signal to control the magnitude of the output  
current in the CC mode. The range of CCPROG is 0 volts to -10 volts, which corresponds to the zero-to-full-scale output  
current range of the supply.  
The Readback Comparators (U516, U517) operate with the Readback DAC/OpAmp (U512, U515) to return the following  
signals to the µP:  
•
•
•
•
•
•
The monitored output voltage (VMON).  
The monitored output current (IMON).  
The ambient temperature (AMB_SENSE).  
The programmed voltage value (CVPROG).  
The programmed current value (CCPROG).  
The fan detector (FAN_DEW).  
The readback DAC circuit is controlled by the µP to successively approximate (to 12-bit resolution) the value of each  
signal monitored. The CVPROG and CCPROG signals are used during selftest to check DAC/OpAmp operation. The µP  
monitors the fan speed and ambient temperature and generates the FAN_PWM control signal to adjust fan speed depending  
upon the ambient temperature measured internally in the power supply.  
A dual DAC, Shunt-Trim/OV, Amplifier circuit (U520, U521) performs two functions. One is to convert the programmed  
overvoltage value from the bus or front panel into the OVREF signal. The OVREF signal is compared by U502 with the  
output voltage. Second, the Shunt Trim DAC calibrates the IMON signal by sampling the current flowing through  
current-sense resistor (R900) on the output power bus together with the TRIM input signal.  
Figure 4-1. AC Calibration of IMON  
During power initiation, the secondary processor generates PWM DISABLE to the power supply's output off for 10  
seconds. After 10 seconds PWM DISABLE is removed and the supply's output can be programmed.  
CV/CC Control (P/O A10 Board) These circuits are shown in detail on the A10 Control Board schematic and include the  
CV (constant voltage) and CC (constant current) control loops. The power supply must act as either a CV or CC supply for  
Principles Of Operation 83  
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any value of load impedance. Switching between CV and CC is done automatically by the CV/CC control circuits at a  
value of load impedance equal to the ratio of the programmed voltage value to the programmed current value.  
A low-level CV or CC signal is generated by the applicable status comparator (P/O U502) and returned to the secondary  
processor to indicate that the corresponding mode, CV or CC, is in effect.  
In CV mode, an OR gate diode (D652) conducts and the CV loop regulates the output voltage. A CV error amplifier (P/O  
U621) compares the programmed voltage signal CVPROG to VMON which is the output signal from the V_DIF  
amplifier(P/O U621). The range of VMON is 0 volts to +10 volts which corresponds to the zero-to-full-scale output voltage  
of the supply. If the output voltage exceeds the programmed voltage the OR GATE signal goes low causing the output  
voltage to decrease to the programmed value.  
Conversely, if the output voltage is less than the programmed voltage, the OR GATE signal goes high causing the output  
voltage to increase to the programmed value. An externally applied dc signal, VPROG, can be used to program the output  
voltage. A 0 volt to -5 volt VP level produces a proportional zero-to-full-scale output voltage.  
In CC mode, an OR gate diode (D651) conducts and the CC loop regulates the output voltage. A CC error amplifier (P/O  
U620) compares the programmed voltage signal CCPROG to IMON which is the output signal of 2nd I_AMP (P/O U620).  
The range of IMON is 0 volts to +10 volts which corresponds to the zero-to-full-scale output voltage of the supply. If the  
output current exceeds the programmed current, the OR GATE signal goes low causing the output current to decrease to the  
programmed value.  
Conversely, if the output current is less than the programmed current, the OR GATE signal goes high causing the output  
current to increase to the programmed value. An externally applied dc signal, IPROG, can be used to program the output  
current. A 0 volt to -5 volt IP level produces a proportional zero-to-full-scale output current.  
Switching/Downprogramming Control (P/O A10) These circuits include a Ramp Generator, Divider /Deadtime Latch, Fast  
Sense Differential Amplifier, Pulse Width Modulator, Summing Comparator, Down-Programmer Control and OV  
Comparator circuits.  
The Divider/Deadtime Latch (U600, U601, U602) divides the 2-MHz ALE_CK signal from the Secondary µP and supplies  
40 KHz pulses to the Ramp Generator (U607) and ON Latch ( U604).  
The OR-GATE signal (CV or CC control signal as previously described) is summed with the 40 KHz triangular waveform  
produced by the Ramp Generator. An input from the Fast Sense Differential Amplifier is also summed to compensate for a  
sudden transient in the rectified output.  
The width of the output pulses from the Summing Amplifier vary as the OR-GATE control signal increases or decreases.  
These pulses are applied to the Pulse-Width Modulator (U603) via the On Latch. The PWM generates the square wave  
pulses that are applied to the A3 FET assembly to turn the FET switches on and off. The Deadtime Latch resets the ON  
Latch to provide a minimum off time for the FET switches.  
The OV circuit compares the output voltage level with the OVREF signal which represents the programmed overvoltage  
level. When the output voltage exceeds the programmed OV value, the downprogrammer circuits are activated and the FET  
switches are turned off  
The Downprogrammer control circuit generates control signal DP CONTROL whenever an OV or disable condition has  
been detected, or when the output voltage exceeds the programmed value. DP CONTROL causes the downprogrammer  
FETs (Q980, Q981) on the A9 Downprogrammer/Fast Sense board to conduct and conduct current away from the load.  
84 Principles Of Operation  
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A4 AC Input Board  
The A4 Input Board contains the Inrush-Current Limit relay (K401), Main Power Relay (K402), current-limiting resistors  
(R407, R408) and open-fuse-detect resistor circuit (R400-R405). On power-on, the current-limit relay (K401) closes  
allowing the dc rail capacitors to charge under a controlled condition. This applies ac voltage to the A6 Bias Board. After  
the turn-on initialization period (approximately 10 seconds), the main relay (K402) closes, shorting out the current-limit  
resistor.  
The open-fuse resistors supply partial ac voltage to the front panel LED board. An open-fuse causes an unbalanced voltage  
to be supplied to the open-fuse detect circuit causing the front panel Check Fuses LED to flash. If all three fuses are good,  
or if all three are open, the Check Fuse does not flash. The three-phase line inductor is connected to the A4 Input board via  
J417 (Range 1, 180-235Vac) or J418 (Range 2, 360-440Vac).  
A5 DC Rail Board  
The A5 DC Rail board contains the full-wave, three-phase, rectifiers and the input filter circuits. The ac mains are full-wave  
rectified by D420-D425 and converted to two, 300-volt dc rails by filter capacitors, C423-C426, and by two range select  
connectors. In range 1 (180-235Vac), J438 connects the two DC rails, called Rail #1 and Rail #2, in parallel. Each rail  
supplies 300Vdc to the A3 FET board via J430 and J431. In Range 2 (360-440Vac), J439 connects the two DC rails in  
series. Each rail still supplies 300 Vdc to the A3 FET board via J430 and J431.  
The A5 DC Rail board also contains the bias transformer and primary range select connectors J436 (Range 1) and J437  
(Range 2). There are two LEDS (DS420, DS421) which light when more than 40Vdc is present on the dc rails.  
As a precaution always disconnect power supply from ac mains and wait 7 minutes before handling dc rail  
board. Be certain that the LEDs are completely extinguished.  
The +24 auxiliary bias fuse, F420, and the standard bias fuse, F421, are located on the dc rail board.  
A3 FET Board  
The A3 FET board consists of two power FET stages connected between the +rail and -rail voltages, and connected across  
the FET stages is a chassis mounted power transformer. The entire circuit represents an H-bridge configuration. A complete  
stage consists of eight, power FETs and two, bridge-driver ICs. The power FETs are mounted on but isolated from the heat  
sink assembly. The two power FET stages are isolated from each other.  
The DRIVElA, lB and DRIVE2A, 2B pulses, received from the A10 Control board, are used by the bridge drivers (U201,  
U202, U301, U302) to derive control pulses for the FET switches. The width of the pulses determines the ON time of the  
FET switches, thereby determining the magnitude of the output voltage or current. DRIVElA pulses turn on one set of  
+RAIL (Q301, Q311) and -RAIL (Q303, Q333) FETs, causing current to flow through power transformer, T900, in one  
direction. DRIVE2A pulses turn on the other set of +RAIL (Q304, Q344) and -RAIL (Q302, Q322) FETs causing current  
to flow through T900 in the opposite direction. The FET on/off periods are controlled by the duty-cycle detect and the  
peak-current detection circuits. If the output attempts to change, regulation is accomplished by the CV/CC control circuits  
on the A10 Control board. These circuits vary the width of the drive pulses and the duration of the FET on/off periods.  
Principles Of Operation 85  
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Figure 4-2. 1ST Stage of the FET H-Bridge Configuration  
Output Circuits  
The output circuits include the following circuits:  
•
•
•
•
•
•
•
•
Chassis mounted components.  
Two power transformers, T900/T901.  
Two inductors, L900/L901.  
Four rectifiers, D900 through D903.  
Output capacitors.  
A7 Snubber board mounted to the heat sink.  
A8 Fast Sense board.  
A9 Slow/Downprogrammer board and output bus bars.  
Each combination of power transformers, T900/T901, and rectifiers, D900/D903, couples the output pulses from the A3  
FET board. The output of each transformer/rectifier combination is connected in parallel before being applied to the output  
filter. The output filter assembly consists of bus bars with the filter capacitors bolted to them. The filter chokes, L902  
through L906, consist of ferrite cores enclosing the bus bar. The current-sense resistor, R900, is part of the positive-output  
bus bar.  
86 Principles Of Operation  
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Figure 4-3. Agilent Series 668xA Power Supply, Block Diagram  
Principles Of Operation 87  
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5
Replaceable Parts  
INTRODUCTION  
Chapter Organization  
This section lists the replaceable electrical and mechanical parts for the Agilent 668xA series power supplies. (Component  
location diagrams are located in Chapter 6.) The lists consist of tables organized by assemblies as follows:  
Assembly  
See  
Main chassis *  
A1 Front Panel EBoard  
LED Board  
A2 GPIB Board  
A3 FET Board  
A4 AC Input Board  
A5 DC Rail Board  
A6 Bias Board  
A7 Snubber Board  
A8 Fast Sense Board  
A9 Down Programming/Slow Sense Board  
A10 Control Board  
Table 5-3  
Table 5-4  
Table 5-5  
Table 5-6  
Table 5-7  
Table 5-8  
Table 5-9  
Table 5-9  
Table 5-11  
Table 5-9  
Table 5-9  
Table 5-10  
* The locations of circuit board assemblies and chassis-mounted components are shown in Fig 3-20.  
Reading the Tables  
Each table lists electrical components alphabetically by reference designator and provides the Agilent part number followed  
by the part description. Mechanical parts are placed after the electrical parts and listed alphabetically by part description.  
Unless otherwise specified, a listed part is used in all models of the series. Model-specific parts are tabulated by model  
number under the reference designator. The reference designators are defined in Table 5-1. Abbreviations used in parts  
descriptions are explained in Table 5-2.  
Table 5-1. Part Reference Designators  
A
B
C
CR  
D
assembly  
blower (fan)  
capacitor  
thyristor/SCR  
diode  
J
K
L
jack  
relay  
SW  
T
TB  
U
VR  
W
Y
switch  
transformer  
inductor  
plug  
transistor  
resistor  
thermal resistor  
terminal block  
integrated circuit  
voltage regulator  
cable or jumper  
crystal oscillator  
P
Q
R
RT  
DSP  
F
display (LCD)  
fuse  
Table 5-2. Part Description Abbreviations  
assy  
bd  
blvl  
gnd  
lg  
assembly  
board  
belleville  
ground  
long  
M
metric  
sq  
square  
w/o  
xfmr  
xtal  
without  
transformer  
crystal  
mch  
mm  
mtg  
PCB  
machine  
millimeter  
mounting  
pc board  
submin subminiature  
thk  
thrd  
w/  
thick  
thread  
with  
Replaceable Parts 89  
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How to Order Parts  
You can order parts from your local Agilent Technologies, Inc. Sales and Support Office (see the list of offices in the back  
of this manual). When ordering a part, please include the following information:  
• the Agilent part number  
• the desired quantity  
• the part description  
• the model number of the power supply (for example, Agilent 6682A)  
Table 5-3. Main Chassis, Replaceable Parts  
Ref. Desig.  
Agilent Part No.  
Description  
ASSEMBLIES & SUBASSEMBLIES  
A1  
5060-3553  
5060-3542  
5060-3591  
5060-3540  
5060-3543  
5060-3544  
5060-3541  
TESTED FRONT PANEL/KEYPAD  
TESTED KEYPAD PCB ASSY.  
TESTED GPIB PC ASSY.  
A2  
A3  
A4  
A5  
TESTED FET ASSY.  
TESTED AC INPUT BOARD ASSY.  
TESTED DC RAIL BOARD ASSY.  
TESTED BIAS PC ASSY.  
A6  
A7  
6680A  
6681A  
6682A  
6683A  
6684A  
A8  
06680-60021  
06681-60021  
06682-60021  
06683-60021  
06684-60021  
SNUBBER PCB ASSY.  
SNUBBER PCB ASSY.  
SNUBBER PCB ASSY.  
SNUBBER PCB ASSY.  
SNUBBER PCB ASSY.  
FAST SENSE PCB  
A9  
6680A  
6681A  
6682A  
6683A  
6684A  
A10  
06680-60022  
06681-60022  
06682-60022  
06683-60022  
06684-60022  
DOWN PROGRAMMER / SLOW SENSE PC  
DOWN PROGRAMMER / SLOW SENSE PC  
DOWN PROGRAMMER / SLOW SENSE PC  
DOWN PROGRAMMER / SLOW SENSE PC  
DOWN PROGRAMMER / SLOW SENSE PC  
6680A  
6681A  
6682A  
6683A  
6684A  
06681-61020  
06681-61020  
06682-61020  
06683-61020  
06684-61020  
TESTED CONTROL PCB ASSY.  
TESTED CONTROL PCB ASSY.  
TESTED CONTROL PCB ASSY.  
TESTED CONTROL PCB ASSY.  
TESTED CONTROL PCB ASSY.  
ELECTRICAL PARTS  
C423, 424, 425, 426  
0180-4369  
C-F 1500uF 400V  
C900  
6680A  
6681A  
6682A  
0180-4516  
0180-4532  
0180-4615  
CAP 33000uF 7.5V  
CAP 22000uF 16V  
CAP 18000uF 28V  
C901, 902, 903, 904, 905  
6680A  
6681A  
6682A  
6683A  
0180-4516  
0180-4532  
0180-4615  
0180-4596  
0180-4597  
CAP 33000uF 7.5V  
CAP 22000uF 16V  
CAP 18000uF 28V  
CAP 13000uF 45V  
CAP 7.200uF 55V  
6684A  
C906  
6680A  
6681A  
0180-4516  
0180-4532  
CAP 33000uF 7.5V  
CAP 22000uF 16V  
90 Replaceable Parts  
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Table 5-3. Main Chassis, Replaceable Parts  
Ref. Desig.  
Agilent Part No.  
Description  
C907  
6680A  
6681A  
6682A  
6683A  
6684A  
0180-4516  
0180-4532  
0180-4615  
0180-4596  
0180-4597  
CAP 33000uF 7.5V  
CAP 22000uF 16V  
CAP 18000uF 28V  
CAP 13000uF 45V  
CAP 7.200uF 55V  
C920, 921,922,923,924,925  
6682A, 6683A, 6684A  
D900  
6680A, 6681A  
D900A,B  
6682A  
0160-4183  
1906-0396  
CAP 1000pF 250V  
SHOTTY RECTIFIER  
1906-0397  
1906-0398  
SHOTTY RECTIFIER  
SHOTTY RECTIFIER  
6683A, 6684A  
D901  
6680A, 6681A  
D90lA,B  
6682A  
6683A, 6684A  
D902, 903  
6680A, 6681A  
L900, 901  
6680A, 6681A  
6682A  
6683A  
6684A  
L902, 903  
L904, 905, 906  
Q981, 982  
R900  
1906-0396  
SHOTTY RECTIFIER  
1906-0397  
1906-0398  
SHOTTY RECTIFIER  
SHOTTY RECTIFIER  
1906-0396  
SHOTTY RECTIFIER  
06681-80001  
06681-80004  
06681-80005  
06681-80006  
5080-2257  
CHOKE - OUTPUT  
CHOKE - OUTPUT  
CHOKE - OUTPUT  
CHOKE - OUTPUT  
CORE  
9170-1571  
1855-0834  
CORE  
POWER MOSFET  
6680A  
6681A  
6682A  
6683A  
5080-2296  
5080-2297  
06682-80002  
5080-2324  
5080-2324  
SHUNT-CURRENT  
SHUNT-CURRENT  
SHUNT-CURRENT  
SHUNT-CURRENT  
SHUNT-CURRENT  
6684A  
T900, 901  
6680A  
6681A  
6682A  
6683A  
9100-5042  
9100-5043  
9100-5086  
9100-5085  
9100-5076  
POWER TRANSFORMER  
POWER TRANSFORMER  
POWER TRANSFORMER  
POWER TRANSFORMER  
POWER TRANSFORMER  
6684A  
MECHANICAL PARTS  
06652-00005  
06680-20001  
06680-20002  
06680-80003  
06681-80003  
06682-80001  
06683-80001  
06684-80001  
0960-0882  
BUS BAR  
BUSS BAR BLOCK  
BUSS/FET BLOCK  
NAMEPLATE front panel model description  
NAMEPLATE front panel model description  
NAMEPLATE front panel model description  
NAMEPLATE front panel model description  
NAMEPLATE front panel model description  
SENSOR-MOISTURE  
1252-1488  
TERM-BLK-4 POS  
1252-3698  
CONNECTOR  
Replaceable Parts 91  
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Table 5-3. Main Chassis, Replaceable Parts (continued)  
Description  
Ref. Desig.  
Agilent Part No.  
2110-0910  
2110-0911  
3160-0419  
3160-0571  
5001-0538  
5001-0539  
5001-6776  
5001-6778  
5001-6779  
5001-6780  
5001-6781  
5001-6782  
5001-6783  
5001-6784  
5001-6791  
5001-6792  
5001-6793  
5020-2783  
5020-2785  
5020-2797  
5020-2808  
5040-1688  
5040-1689  
5040-1690  
5040-1691  
5040-1694  
5040-1696  
5040-1697  
5040-1700  
5040-1701  
5041-880 1  
5041-8819  
5041-8820  
5060-3237  
5060-3490  
5060-3489  
FUSE (see 5060-3513 )  
FUSE (see 5060-3512 )  
FAN FINGER GUARD  
FAN-TUBEAXIAL  
TRIM-SIDES  
TRIM SIDES,FRENCH GRAY  
CHASSIS, BASE  
PANEL, REAR  
COVER-OUTSIDE  
INPUT SUB-CHASSIS (see 5060-3490 )  
OUTPUT SUB-CHASSIS  
CHASSIS-TOP (inside cover )  
INPUT DECK  
OUTPUT DECK  
TRAY (control board )  
SHIELD  
GPIB-BRACKET (chassis top )  
HEATSINK-DIODE  
HEATSINK-FET  
SHIELD-ISOLATION  
INSULATOR  
BUSS-BEZEL  
BUSS BAR SUPPORT  
BRACKET-HS  
HS-PLEN  
BUSS BAR, PLUS, output end (large)  
BUSS BAR, PLUS, internal end (small)  
BLOCK-TOP COVER  
COLLAR-MOLDED  
BUSS BAR BRACE  
FOOT  
CAP-STRAP HANDLE  
CAP-STRAP HANDLE  
AC INPUT COVER ASSY.  
AC SUB-CHASSIS ASSY.  
NEGATIVE OUTPUT BUSS BAR ASSY.  
with L902/L903 CORE  
SUB-CHASSIS  
3 PHASE LINE CHOKE  
CABLE - 3 phase line choke/AC input assy  
FAN TRANSFORMER  
WIRE KIT (+/- sense leads)  
400VAC/16A FUSE KIT  
3 ea. FUSE 16AM 400VAC  
208VAC/30A FUSE KIT  
3 ea. FUSE 30AM 500V  
STRAP HANDLE  
5001-6780  
5080-2262  
5080-2298  
9100-5044  
5060-3492  
5060-3512  
2110-0911  
5060-3513  
2110-0910  
5062-3705  
5080-2038  
5080-2148  
5080-2168  
5080-2277  
5080-2280  
5080-2282  
5080-2285  
LABEL-WARNING (no operator serviceable)  
CABLE (chaining- 2 meters)  
CABLE-ASSY.  
SUL-THERMAL  
CABLE- BIAS/CONTROL  
CABLE - AC/RFI FILTER  
CABLE- GPIB/FAN  
92 Replaceable Parts  
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Table 5-3. Main Chassis, Replaceable Parts (continued)  
Description  
Ref. Desig.  
Agilent Part No.  
1400-0611  
5080-2299  
5080-2413  
5080-2414  
5080-2415  
5080-2314  
5080-2315  
5080-2316  
5960-5588  
668lA#400  
6681A#601  
6681A#602  
5060-3514  
6681A#861  
8120-6203  
6681A#862  
8120-6204  
6681A#908  
5062-3974  
5062-3977  
6681A#909  
5062-3974  
5062-3983  
7120-6153  
9135-0493  
CABLE CLAMP (GPIB/FAN)  
LABEL REAR PANEL  
CRATE ( shipping container )  
SKID ( shipping container )  
FOAM PAD ( shipping container )  
EDGE PROTECTOR 12 inches ( shipping container )  
EDGE PROTECTOR 2.5 inches ( shipping container )  
CABLE ASSY.  
MANUAL-OPERATING  
400V OPERATION  
BUS BAR COVER  
BUS BAR SPACER  
BB SPCR KIT #602  
CABLE-UL/CSA  
L CORD 10AWG300V  
CABLE-HARMONIZED  
L CORD 2.5mm450V  
RACK MOUNT KIT  
RACK MTG KIT  
RACK MOUNT KIT  
RACK MOUNT KIT W/HANDLES  
RACK MTG KIT  
RACK MOUNT KIT  
LABEL-WARNG  
FILTER-RFI  
Table 5-4. A1 Front Panel Board, Replaceable Parts  
Agilent Part No. Description  
ELECTRICAL PARTS  
Ref. Desig.  
C1  
C2  
C4  
C5  
0160-5422  
0160-4808  
0160-4787  
0180-0155  
0160-5422  
0160-4835  
0160-5422  
0180-0155  
1906-0229  
9140-0158  
1251-4927  
1251-4926  
1252-0718  
1251-8184  
9140-0158  
1810-0560  
0698-3359  
0698-3155  
1810-0371  
0698-3441  
0698-3155  
0837-0412  
Capacitor 0.047µF 20%  
Capacitor 470pF 5%  
Capacitor 22pF 5% 100V  
Capacitor 2.2µF 20V  
Capacitor 0.047µF 20%  
Capacitor 0.1µF 10% 50V  
Capacitor 0.047µF 20%  
Capacitor 2.2µF 20V  
Diode array 50V  
C6,7  
C8  
C10-12, C14-16  
C17  
D1,2  
L1  
J2  
J3  
J4,5  
J6  
L1  
R1  
R2  
COIL lUH 10%  
Receptacle LCD display  
Receptacle test header  
Receptacle (A3G1, A3G2)  
Receptacle phone (GPIB board)  
Inductor 1µH 10%  
Resistor network DIP  
Resistor 12.7K 1%  
Resistor 4.64K l%  
R23-25,27-30  
R37  
R38  
R39,40  
RT1  
Resistor network SIP  
Resistor 215 Ω 1% 0.125W  
Resistor 4.64K 1%  
Thermistor  
Replaceable Parts 93  
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Table 5-4. A1 Front Panel Board, Replaceable Parts (continued)  
Ref. Desig.  
Agilent Part No.  
3101-3088  
1902-0950  
1820-6721  
5080-2466  
1818-4792  
1820-2724  
1258-0209  
0811-3590  
0410-2159  
1902-0950  
Description  
S1  
VR16  
U3  
U4  
U6  
Line switch  
Diode Zener 4.7V 5  
IC MPU  
ROM programmed front panel  
IC memory  
U8  
IC SN74ALS573BN  
Jumper (J3)  
Jumper  
W3  
W5  
Y1  
Crystal 10 MHz  
Diode Zener 4.7V 5%  
Z16  
MECHANICAL PARTS  
--  
--  
--  
--  
--  
--  
1200-1274  
1200-1417  
0340-1277  
0370-3238  
0515-1455  
0590-0534  
Socket IC (U3)  
Socket IC (U4)  
Insulator (Y1)  
KNOB Ref: RPG  
SCREW - Ref: keypad PCB to front frame  
NUT - SELFTREAD -  
Ref: Display & LED board to front panel  
RPG - OPTICAL ENCODER  
PCA (KEYPAD)  
WINDOW Ref: 3 inches front frame  
BLINDER Ref: 5 inches front frame  
KEYPAD  
FRONT FRAME - 88.1mm ( 3.5 inches )  
FRONT FRAME - 132.6mm ( 5.25 inches )  
LCD DISPLAY  
LABEL Ref: 3.5 inches & 5 inches front frame  
CABLE Ref: Keypad PCB to LCD display  
--  
0960-0912  
5063-3408  
1000-0842  
5001-6794  
5040-1665  
5040-1687  
5040-1698  
5063-3473  
5080-2245  
5080-2261  
--  
--  
--  
--  
--  
--  
--  
--  
Table 5-5. Front Panel Board LED Assy, Replaceable Parts  
Agilent Part No. Description  
ELECTRICAL PARTS  
Ref. Desig.  
C450  
C451  
D450, 451, 452, 453  
0180-4132  
0160-4808  
1901-1098  
0698-3444  
0757-0401  
0698-3156  
0698-8827  
0698-3156  
0757-0280  
1858-0076  
1858-0077  
1902-0562  
CAP 6.8uF 35V  
CAP 470pF 5%  
DIO-1N4150  
RES 316 1% .125W  
RES 100 1% .125W  
RES 14.7K 1%  
RES lM 1% .125W  
RES 14 7K 1%  
RES lK 1% .125W  
R450  
R451  
R452  
R453  
R454  
R455  
U450  
U451  
Z450  
XSTR ARY 14P-DIP  
XSTR ARY 14P DIP  
DIO-ZNR 22.1V 5%  
MECHANICAL PARTS  
5080-2281  
5080-2283  
CABLE LINE SWITCH Ref: E456=E457 to S1  
CABLE LED AC INPUT  
Ref: E450-E451 to DC RAIL J440  
CABLE DEW/S1 CONNECTION  
Ref: E452-E455 to DC RAIL J441  
5080-2286  
94 Replaceable Parts  
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Table 5-6. A2 GPIB Board, Replaceable Parts (see Note)  
Agilent Part No. Description  
ELECTRICAL PARTS  
Ref. Desig.  
C122  
C128  
F101  
J101  
J106  
J107, 108, 114, 115  
P101  
U110, U111  
U113  
U117  
U118  
U121  
TB101  
0180-4606  
0160-4281  
2110-0699  
1252-2320  
1251-4926  
1251-7330  
1251-4245  
1990-0444  
1990-0543  
1820-2549  
1820-4185  
1820-0430  
0360-2312  
Capacitor 10,000µF  
Capacitor 2,200pF  
Fuse Subminature 5AM  
Connector Receptacle (GPIB)  
Connector Receptacle (Test Header)  
Connector Receptacle  
Connector Plug 2-pin (AC Bias)  
IC Optoisolator  
IC Optoisolator  
IC Optoisolator  
IC Optoisolator  
IC Voltage regulator  
Terminal Block (Digital Control)  
MECHANICAL PARTS  
--  
--  
--  
--  
1205-0758  
0535-0031  
0515-0642  
0515-0911  
Heatsink (U121)  
Nut hex w/lockwasher (J101)  
Screw (U121)  
Screw M3x0 5 (J101)  
Note: All other parts are surface mounted and are not field repairable  
Table 5-7. A3 FET Assembly, Replaceable Parts  
Ref. Desig.  
Agilent Part No.  
ELECTRICAL PARTS  
Description  
C201  
C202  
C203  
C204, 205  
C206  
C207, 208, 209  
C210, 211, 213, 214,  
C215, 216  
C217  
C218  
C219  
C220  
C221  
C222  
C226  
C227  
C228  
C229  
C230  
0160-7505  
0180-4132  
0160-4835  
0160-5098  
0180-4132  
0160-2006  
0160-6838  
0160-2006  
0160-5098  
0160-4835  
0160-2006  
0180-4132  
0160-5098  
0180-4132  
0160-4791  
0160-4835  
0160-2301  
0160-4918  
0160-4831  
0160-2301  
0160-4832  
0160-4791  
0160-4832  
0160-5098  
7uF+ - 5% 200V  
CAP 6.8uF 35V  
CAP .luF 10% 50V  
CAP .22uF 10%  
CAP 6.8uF 35V  
CAP 100pF 10%  
CAP 2200pF lKV  
CAP 100pF 10%  
CAP .22uF 10%  
CAP .luF 10% 50V  
CAP 100pF 10%  
CAP 6.8uF 35V  
CAP .22uF 10%  
CAP 6.8uF 35V  
CAP 10pF 5% 100V  
CAP .luF 10% 50V  
CAP 2000pF 100V  
CAP .022uF 50V  
CAP 4700pF 10%  
CAP 2000pF 100V  
CAP .0luF 10%  
C231  
C235, 236, 237, 238  
C239  
C240  
C242, 243  
CAP 10pF 5% 100V  
CAP .0luF 10%  
CAP .22uF 10%  
Replaceable Parts 95  
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Table 5-7. A3 FET Assembly, Replaceable Parts (continued)  
Description  
Ref. Desig.  
C244, 245  
Agilent Part No.  
0160-6806  
0160-4832  
0180-4132  
0160-7505  
0180-4132  
0160-4835  
0160-5098  
0180-4132  
0160-2006  
0160-6838  
0160-2006  
0160-5098  
0160-4835  
0160-2006  
0180-4132  
0160-5098  
0180-4132  
0160-4791  
0160-5098  
0160-4832  
0160-4835  
0160-4832  
0160-4791  
0160-4832  
0160-5098  
0160-6806  
0160-4800  
1901-0050  
1901-1065  
1901-0050  
1901-1065  
1901-0050  
1901-0050  
1901-0050  
1901-0731  
1901-0050  
1901-1065  
1901-0050  
1901-1065  
1901-0050  
1901-0050  
1901-0050  
1901-0731  
9170-1454  
9170-1510  
9170-1510  
9170-1454  
9170-1454  
9170-1510  
9170-1510  
9170-1454  
1855-0859  
1855-0859  
1853-0363  
CAP .luF 400V  
C248  
C258  
C301  
C302  
C303  
C304, 305  
C306  
C307, 308, 309  
C310, 311, 313, 314  
C315, 316  
C317  
C318  
C319  
C320  
C321  
C322  
C326  
C329  
C330  
C331  
C335, 336, 337, 338  
C339  
C340  
C342, 343  
C344, 345  
C346  
D201, 202  
D202  
D203, 204  
CAP .0luF 10%  
CAP 6.8uF 35V  
7uF+ - 5% 200V  
CAP 6.8uF 35V  
CAP .luF 10% 50V  
CAP .22uF 10%  
CAP 6.8uF 35V  
CAP 100pF 10%  
CAP 2200pF lKV  
CAP 100pF 10%  
CAP .22uF 10%  
CAP .luF 10% 50V  
CAP 100pF 10%  
CAP 6.8uF 35V  
CAP .22uF 10%  
CAP 6.8uF 35V  
CAP 10pF 5% 100V  
CAP .22uF 10%  
CAP .01uF 10%  
CAP .luF 10% 50V  
CAP .0luF 10%  
CAP 10pF 5% 100V  
CAP .01uF 10%  
CAP .22uF 10%  
CAP .luF 400V  
CAP 120pF 5%  
DIO-SWITCHING  
DIO-lN4936 PWR  
DIO-SWITCHING  
DIO-lN4936 PWR  
DIO-SWITCHING  
DIO-SWITCHING  
DIO-SWITCHING  
DIO-PWR RECT  
DIO-SWITCHING  
DIO-lN4936 PWR  
DIO-SWITCHING  
DIO-lN4936 PWR  
DIO-SWITCHING  
DIO-SWITCHING  
DIO-SWITCHING  
DIO-PWR RECT  
CORE-SHLD-BEAD  
CORE-MAGNETIC  
CORE-MAGNETIC  
CORE-SHLD-BEAD  
CORE-SHLD-BEAD  
CORE-MAGNETIC  
CORE-MAGNETIC  
CORE-SHLD-BEAD  
MOSFET 500V 20A  
MOSFET 500V 20A  
D45H5/D45H8/363  
D205  
D206, 207, 208, 209, 210  
D213, 214, 215, 216, 217  
D220, 221, 222, 223  
D224  
D301, 302  
D302  
D303, 304  
D305  
D306, 307, 308, 309, 310  
D313, 314, 315, 316, 317  
D320, 321, 322, 323  
D324  
L201, 202, 203, 204  
L205, 206, 207, 208, 209  
L210, 211, 212  
L213, 214, 215, 216  
L301, 302, 303, 304  
L305, 306, 307, 308, 309  
L310, 311, 312  
L313, 314, 315, 316  
Q201, 202, 203, 204  
Q211, 222, 233, 244  
Q251, 252, 253, 254  
96 Replaceable Parts  
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Table 5-7. A3 FET Assembly, Replaceable Parts (continued)  
Description  
Ref. Desig.  
Q301, 302, 303, 304  
Q311, 322, 333, 344  
Q351, 352, 353, 354  
R201  
R202  
R203  
R205  
R206  
R207  
R208  
R209  
R210  
R211, 212  
R213, 214, 216, 217  
R220, 221  
R222  
R224, 225  
R226  
R227  
R228  
R229  
R230  
R231  
R232  
R233  
R237  
R238  
R239  
R240  
R241, 242  
R243  
R244  
R245  
R246  
R247  
R248  
R249  
R250  
R251  
R252  
R253  
R254  
R255  
R256  
R257  
R258  
R260, 261  
R262  
R263, 264, 265  
R266  
R267  
R268  
R269  
Agilent Part No.  
1855-0859  
1855-0859  
1853-0363  
0811-3903  
0699-0208  
0683-5615  
0683-0625  
0683-7505  
0683-0335  
0683-3305  
0683-0625  
0683-8205  
0683-1535  
0811-3903  
0811-3903  
0811-2556  
0811-3903  
0683-1535  
0698-3159  
0683-8205  
0683-0625  
0683-3305  
0683-7505  
0683-0335  
0683-0625  
0757-0437  
0757-0280  
0757-0437  
0757-0280  
0757-0437  
0683-1535  
0698-4457  
0683-1015  
0683-1555  
0757-0462  
0698-3159  
0757-0444  
0698-3572  
0757-0288  
0698-3225  
0698-6533  
0698-3279  
0683-1015  
0698-3432  
0698-3430  
0683-1035  
0683-8205  
0683-1215  
0683-8205  
0683-1215  
0683-8205  
0698-3572  
0698-4121  
0757-0440  
MOSFET 500V 20A  
MOSFET 500V 20A  
D45H5/D45H8/363  
RES 150 Ohm 5W NI  
RES 1 5% .25W CF  
RES 560 5% .25W  
RES 6.2 5% .25W  
RES 75 5% .25W  
RES 3.3 5% .25W  
RES 33 5% .25W  
RES 6.2 5% .25W  
RES 82 5% .25W  
RES 15K 5% .25W  
RES 150 Ohm 5W NI  
RES 150 Ohm 5W NI  
RES 1.25 1% 4W  
RES 150 Ohm 5W NI  
RES 15K 5% .25W  
RES 26.1K 1%  
RES 82 5% .25W  
RES 6.2 5% .25W  
RES 33 5% .25W  
RES 75 5% 25W  
RES 3.3 5% 25W  
RES 6.2 5% 25W  
RES 4.75K 1%  
RES lK 1% .125W  
RES 4.75K 1%  
RES lK 1% .125W  
RES 4.75K 1%  
RES 15K 5% .25W  
RES 576 1% .125W  
RES 100 5% .25W  
RES 1.5M 5% .25W  
RES 75K 1%  
RES 26.1K 1%  
RES 13.1K 1%  
RES 60.4K 1%  
RES 9.09K 1%  
RES 1.43K 1%  
RES 12.5K 1%  
RES 4.99K 1%  
RES 100 5% .25W  
RES 26.1 1%  
RES 21.5 1%  
RES l0K 5% .25W  
RES 82 5% .25W  
RES 120 5% .25W  
RES 82 5% .25W  
RES 120 5% .25W  
RES 82 5% .25W  
RES 60.4K 1%  
RES 11.3K 1%  
RES 7.5K 1%  
R270  
Replaceable Parts 97  
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Table 5-7. A3 FET Assembly, Replaceable Parts (continued)  
Description  
Ref. Desig.  
Agilent Part No.  
0757-0200  
0757-0442  
0757-0437  
0698-3633  
0811-3903  
0699-0208  
0683-5615  
0698-4435  
0683-0625  
0683-7505  
0683-0335  
0683-3305  
0683-0625  
0683-8205  
0683-1535  
0683-1535  
0811-3903  
0811-3903  
0811-2556  
0811-3903  
0683-1535  
0683-1555  
0683-8205  
0683-0625  
0683-3305  
0683-7505  
0683-0335  
0683-0625  
0757-0437  
C757-0280  
0757-0437  
0757-0280  
0757-0437  
0683-1535  
0757-0442  
0698-3136  
0757-0382  
0683-8205  
0683-1215  
0683-8205  
0683-1215  
0683-8205  
0698-3572  
0698-4121  
0757-0440  
0757-0200  
0757-0442  
0757-0437  
0698-3633  
0757-0274  
0683-1005  
0757-0437  
0698-0085  
0683-1015  
R271  
R272  
R273, 274, 275  
R277  
R301  
R302  
R303  
R304  
R305  
R306  
R307  
R308  
R309  
R310  
R311  
R312  
R313, 314, 316, 317  
R320, 321  
R322  
R324, 325  
R326  
R327  
R328  
R329  
R330  
R331  
R332  
R333  
R337  
R338  
R339  
R340  
R341, 342  
R343  
RES 5.62K 1%  
RES l0K 1% .125W  
RES 4.75K 1%  
RES 3905% 2W MO  
RES 150Ohm 5W NI  
RES 1 5% .25W CF  
RES 5605% .25W  
RES 2.49K 1%  
RES6.25% .25W  
RES 75 5% .25W  
RES 3.3 5% .25W  
RES 33 5% .25W  
RES 6.2 5% .25W  
RES 82 5% .25W  
RES 15K 5% .25W  
RES 15K 5% .25W  
RES 150 Ohm 5W NI  
RES 150 Ohm 5W NI  
RES 1.25 1% 4W  
RES 150 Ohm 5W NI  
RES 15K 5% .25W  
RES 1.5M 5% .25W  
RES 82 5% .25W  
RES 6.2 5% .25W  
RES 33 5% .25W  
RES 75 5% .25W  
RES 3.3 5% .25W  
RES 6.2 5% .25W  
RES 4.75K 1%  
RES lK 1% .125W  
RES 4.75K 1%  
RES lK 1% .125W  
RES 4.75K 1%  
RES 15K 5% .25W  
RES 10K 1% .125W  
RES 17.8K 1%  
R354  
R355  
R356, 357  
R360, 361  
R362  
R363, 364, 365  
R366  
R367  
R368  
R369  
R370  
R371  
R372  
R373, 374, 375  
R377  
R378  
R379  
R380  
R381  
R382  
RES 16.21%  
RES 82 5% .25W  
RES 120 5% .25W  
RES 82 5% .25W  
RES 120 5% .25W  
RES 82 5% .25W  
RES 60.4K 1%  
RES 11.3K 1%  
RES 7.5K 1%  
RES 5.62K 1%  
RES 10K 1% .125W  
RES 4.75K 1%  
RES 390 5% 2W MO  
RES 1.21K 1%  
RES 10 5% .25W  
RES 4.75K 1%  
RES 2.61K 1%  
RES 100 5% .25W  
98 Replaceable Parts  
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Table 5-7. A3 FET Assembly, Replaceable Parts (continued)  
Ref. Desig.  
Agilent Part No.  
0757-0442  
8159-0005  
9100-4350  
06624-80091  
5080-2238  
9100-4350  
06624-80091  
1820-8433  
1826-1343  
1826-0138  
1826-1475  
1820-8433  
1826-1343  
1826-0412  
1990-0996  
1902-1377  
Description  
R383  
RES 10K 1% .125W  
RES-ZERO OHMS  
XFMR-CURRENT  
XFMR-PULSE  
R384, 385  
T202  
T204  
T205  
T302  
T304  
XFMR-CUR SHARING  
XFMR-CURRENT  
XFMR-PULSE  
PWM I.C. IR2110  
U201, 202  
U203  
IC-VOLTAGE REG TL431CP  
IC COMPARATOR LM339N  
VOLTAGE COMPTR LT101lCN8  
PWM I.C. IR2110  
IC-VOLTAGE REG TL431CP  
IC LM393N  
U204  
U205  
U301, 302  
U303  
U304  
U305  
OPTO-ISOLATOR HCPL-2200  
DIO-ZNR 6 19V  
Z201, 301  
MECHANICAL PARTS  
5080-2279  
5080-2283  
CABLE FET CONTROL  
Ref: E208-E209 to CONTROL J511  
CABLE +15V BIAS  
Ref: E206-E207 to BIAS J831  
Ref: E306-E307 to BIAS J830  
CABLE FET RAIL A  
Ref: E201-E202 to DCRAIL J430  
CABLE FET RAIL B  
5080-2291  
5080-2295  
Ref: E301-E302 to DCRAIL J431  
Table 5-8. A4 AC Input Assembly, Replaceable Parts  
Agilent Part No. Description  
ELECTRICAL PARTS  
Ref. Desig.  
C420  
C428, 429, 430  
J417, 418  
J419  
J420  
K401  
K402  
R400, 401,402,403,404,405  
R407, 408  
R435, 436, 437  
0160-7606  
0160-7898  
1251-5422  
1251-6832  
1251-3819  
0490-1908  
5060-3593  
0764-0027  
0699-3191  
0698-3609  
CAP 1uF 275V  
CAP 0.01uF 440V  
CONNECTOR  
CONNECTOR  
CONNECTOR  
RELAY 24V COIL  
CONTACTOR, 3 POLE  
RES 75K 5% 2W MO  
RES 27 OHM 5% 20W  
RES 22 OHM 5% 2W  
MECHANICAL PARTS  
5060-3493  
5080-2284  
WIRE KIT (E403-E408 to Fl,F2,F3)  
CABLE RELAY CNTRL (E411-E413 to BIAS J827)  
Replaceable Parts 99  
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Table 5-9. A5 DC Rail Assembly, Replaceable Parts  
Agilent Part No. Description  
ELECTRICAL PARTS  
Ref. Desig.  
C418  
C420, 421, 422  
C427  
D420, 421, 422, 424, 425  
DS420, 421  
F420  
F420  
F421  
F421  
J430, 431  
J432  
0160-4048  
0160-7606  
0160-7743  
5060-3516  
1990-0517  
2110-1107  
2110-0934  
2110-1107  
2110-0934  
1251-7616  
1251-6832  
1251-3819  
1251-3837  
1252-0055  
1252-0056  
5080-2300  
0698-3611  
0764-0044  
0764-0044  
CAP 0.022uF 20%  
CAP luF 275V  
C-F .047uF 380V  
ASSY.-RECTIFIER  
LED  
FUSE CLIPS  
FUSE .5AM, 500V  
FUSE CLIPS  
FUSE .5AM, 500V  
CONNECTOR  
CONNECTOR  
CONNECTOR  
CONNECTOR  
CONNECTOR  
CONNECTOR  
INDUCTOR-NM  
RES 27 5% 2W MO  
RES 8.2K 5% 2W  
RES 8.2K 5% 2W  
J433  
J436, 437, 438, 439  
J440  
J441  
L420, 421  
R420, 421, 422  
R423, 424, 425,426,427,428  
R429, 430, 431,432,433,434  
MECHANICAL PARTS  
5080-2286  
5080-2288  
5080-2289  
5080-2293  
5080-2294  
CABLE BIAS 24V SECONDARY  
Ref: E440-E443 to BIAS J816  
CABLE AC POWER  
Ref: E420-E425 to ACINPUT J420  
CABLE AC BIAS  
Ref: E430-E434 to ACINPUT J419  
CABLE BIAS LINE SELECT  
Ref: E444-E447 to J436/J437  
CABLE RAIL LINE SELECT  
Ref: E448-451 to J438/J439  
Table 5-10. A6 Bias Assembly, Replaceable Parts  
Agilent Part No. Description  
ELECTRICAL PARTS  
Ref. Desig.  
C800  
C801  
C803  
C804  
C805  
C806  
C807  
C808  
C809, 810  
C811, 812  
C813  
C814, 815  
C8 16, 817  
C818, 819  
C820, 821, 822  
0160-4834  
0180-4140  
0160-5422  
0180-4131  
0160-7743  
0160-4834  
0180-3587  
0180-0230  
0180-4129  
0160-4834  
0180-2980  
0180-4129  
0180-4405  
0180-0230  
0180-4129  
CAP .047uF 10%  
CAP 1800 uF 63V  
CAP .047uF 20%  
CAP 4.7uF 35V  
C-F .047uF 380V  
CAP .047uF 10%  
CAP 1000uF 50V  
C-F luF 50V  
CAP luF 35V  
CAP .047uF 10%  
C-F 1000uF 50V  
CAP luF 35V  
CAP 470 uF 50V  
C-F luF 50V  
CAP luF 35V  
100 Replaceable Parts  
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Table 5-10. A6 Bias Assembly, Replaceable Parts (continued)  
Description  
Ref. Desig.  
Agilent Part No.  
0180-4131  
0180-3298  
0160-4834  
0180-3587  
0180-0230  
0180-4129  
0180-4397  
0180-4131  
0160-4835  
0180-4131  
0180-0228  
1901-0731  
1901-0731  
1901-0731  
1901-0731  
1902-0018  
1901-1098  
1902-3393  
2110-0712  
2110-0679  
1252-1670  
1252-8837  
1252-0056  
1252-5230  
1251-7070  
1252-0055  
5060-3245  
5060-3527  
0683-3025  
0683-0475  
0698-0084  
0698-3440  
8159-0005  
0698-0084  
0698-3440  
0699-0208  
8159-0005  
0757-0442  
0698-6392  
0698-6631  
0699-0070  
0698-4493  
0757-0290  
0757-0283  
0699-0070  
0757-0444  
0757-0274  
0757-0444  
0757-0290  
0757-0280  
0757-0442  
0698-0085  
0757-0442  
0698-6363  
C823  
C824, 825  
C826  
C827  
C828  
C829, 830, 831  
C841  
C842  
C843, 844, 845  
C846  
C847  
D800, 801, 802,803,804,805  
D806, 807, 808,809,810,811  
D812, 813, 814,815,816,817  
D818, 819  
D820  
D830  
D832  
F800  
F803, 804, 805, 806  
J801  
J809  
J816  
J821  
J827  
J830, 831  
Q818, 819  
Q820, 821, 822  
R800  
R801, 802  
R803  
CAP 4.7uF 35V  
C-F 2200uF 50V  
CAP .047uF 10%  
CAP 1000uF 50V  
C-F luF 50V  
CAP luF 35V  
C-F 100uF 63V  
CAP 4.7uF 35V  
CAP .luF 10% 50V  
CAP 4.7uF 35V  
C-F 22uF 15V  
DIO-PWR RECT  
DIO-PWR RECT  
DIO-PWR RECT  
DIO-PWR RECT  
DIO-ZNR lN941  
DIO-IN4150  
DIO-ZNR 75V 55'o  
FU-SUBMIN 4A  
FUSE 1.5AM, 125V  
CONNECTOR  
CONNECTOR  
CONNECTOR  
CONNECTOR  
CONNECTOR  
CONNECTOR  
HEAT SINK-TRANSISTOR (1854-0828) ASSY.  
HEAT SINK-TRANSISTOR (1854-0828) ASSY.  
RES 3K 5% .25W  
RES 4.7 5% .25W  
RES 2.15K 1%  
RES 196 1% .125W  
RES-ZERO OHMS  
RES 2.15K 1%  
RES 196 1% .125W  
RES 1 5% .25W CF  
RES-ZERO OHMS  
RES 10K 1% .125W  
RES 22K .1%.125W  
RES 2.5K .1%  
RES 3.16M 1%  
RES 34K 1% .125W  
RES 6.19K 1%  
RES 2K 1% .125W  
RES 3.16M 1%  
RES 12.1K 1%  
R804  
R805, 806  
R807, 808, 809  
R810  
R811  
R812, 813, 814, 815, 816  
R817  
R818  
R819  
R820  
R821  
R822  
R823  
R824  
R825  
R827  
R828  
R831  
R833  
R834  
R835  
R836  
RES 1.21K 1%  
RES 12.1K 1%  
RES 6.19K 1%  
RES lK 1% .125W  
RES 10K 1% .125W  
RES 2.61K 1%  
RES 10K 1% .125W  
RES 40K .1%  
R841  
Replaceable Parts 101  
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Table 5-10. A6 Bias Assembly, Replaceable Parts (continued)  
Description  
Ref. Desig.  
Agilent Part No.  
0698-6360  
0757-0472  
0698-6977  
0698-6360  
0698-6977  
0683-3325  
0698-6977  
0698-4037  
0683-3325  
0683-1005  
0698-3152  
0698-4037  
0683-1005  
0698-8234  
0699-0070  
0757-0469  
0699-0070  
0757-0464  
0757-0290  
0757-0199  
0757-0281  
8159-0005  
0698-3440  
0698-0084  
8159-0005  
0757-0274  
0698-4037  
0683-1005  
8159-0005  
9100-5040  
9100-5041  
5060-2942  
5060-2948  
5060-2942  
5060-2943  
5060-2942  
1826-0544  
1826-0138  
1858-0047  
1990-1074  
1826-0161  
1990-1074  
R842  
R843  
R844  
R845, 847  
R848  
R849  
R850  
R851  
R852  
R853, 854, 855  
R856  
R857  
R858, 859, 860  
R861  
R862  
R863  
R864  
R865  
R867  
R868  
R869  
R870  
R871  
R872  
R873  
R874  
R875  
R876, 877, 878  
R879, 880  
T801  
T802  
U801  
U802  
U803  
U804  
U805  
RES 10K .1%  
RES 200K 1%  
RES 30K .1% .125  
RES 10K .1%  
RES 30K .1% .125  
RES 3.3K 5% .25W  
RES 30K .1% .125  
RES 46.4 1%  
RES 3.3K 5% .25W  
RES 10 5% .25W  
RES 3.48K 1%  
RES 46.4 1%  
RES 10 5% .25W  
RES 12.1K 1%  
RES 3.16M 1%  
RES 150K 1%  
RES 3.16M 1%  
RES 90.9K 1%  
RES 6.19K 1%  
RES 21.5K 1%  
RES 2.74K 1%  
RES-ZERO OHMS  
RES 196 1% .125W  
RES 2.15K 1%  
RES-ZERO OHMS  
RES 1.21K 1%  
RES 46.4 1%  
RES 10 5% .25W  
RES-ZERO OHMS  
XFMR- GPIB  
XFMR-BIAS  
HEAT SINK-LM317T REGULATOR ASSY.  
HEAT SINK-UA7805UC REGULATOR ASSY.  
HEAT SINK-LM317T REGULATOR ASSY.  
HEAT SINK-LM337T REGULATOR ASSY.  
HEAT SINK-LM317T REGULATOR ASSY.  
IC-V RGLTR 2.5V MC1403U  
IC COMPARATOR LM339N  
XSTR ARY 16P-DIP  
OPTO-ISOLATOR 4N35  
IC LM324N  
U806  
U807  
U808  
U809, 810, 811  
U812  
U813  
OPTO-ISOLATOR 4N35  
MECHANICAL PARTS  
5080-2292  
CABLE PRIMARY BIAS  
Ref: E800-E804 to DCRAIL J432  
102 Replaceable Parts  
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Table 5-11. A7 Snubber Assembly, Replaceable Parts  
Agilent Part No. Description  
ELECTRICAL PARTS  
Ref. Desig.  
C910, 911, 912, 913  
6680A, 6681A  
6682A  
6683A  
6684A  
0160-0162  
0160-6896  
0160-4845  
0160-6162  
CAP .022uF 10%  
CAP .015uF 10%  
CAP 6800pF 10%  
CAP 4700pF 10%  
R910, 911, 912, 913  
6680A, 6681A  
6682A  
6683A  
6684A  
0698-3601  
0698-3611  
0764-0013  
0698-3614  
RES 10 5% 2W MO  
RES 27 5% 2W MO  
RES 56 5% 2W MO  
RES 43 5% 2W MO  
R914, 915, 916, 917, 918  
6680A, 6681A  
6682A  
6683A  
6684A  
not used  
0698-3611  
0764-0013  
0698-3614  
RES 27 5% 2W MO  
RES 56 5% 2W MO  
RES 43 5% 2W MO  
R919, 920, 921  
6680A, 6681A  
6682A  
6683A  
6684A  
not used  
0698-3611  
0764-0013  
0698-3614  
RES 27 5% 2W MO  
RES 56 5% 2W MO  
RES 43 5% 2W MO  
MECHANICAL PARTS  
6680A, 6681A  
5060-3327  
5060-3365  
WIRE KIT ( 2 required )  
Ref: D900,D901,D902,D903  
WIRE KIT  
6682A, 6683A, 6684A  
Ref: D900A,B,D90lA,B  
Table 5-12. A7 Fast Sense Assembly, Replaceable Parts  
Agilent Part No. Description  
ELECTRICAL PARTS  
Ref. Desig.  
06680-60023  
06681-60023  
06682-60023  
06683-60023  
FAST SENSE PC ASSEMBLY  
Ref:6680A POWER SUPPLY  
FAST SENSE PC ASSEMBLY  
Ref:6681A POWER SUPPLY  
FAST SENSE PC ASSEMBLY  
Ref:6682A POWER SUPPLY  
FAST SENSE PC ASSEMBLY  
Ref:6683A POWER SUPPLY  
Ref:6681A POWER SUPPLY  
FAST SENSE PC ASSEMBLY  
Ref:6684A POWER SUPPLY  
CAP 0.47uF 50V  
06684-60023  
0160-5468  
Cl000  
MECHANICAL PARTS  
CABLE Ref: El001-El003 to CONTROL J512  
5080-2287  
Replaceable Parts 103  
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Table 5-13. A9 Down Programmer/Slow Sense, Replaceable Parts  
Agilent Part No. Description  
ELECTRICAL PARTS  
Ref. Desig.  
C950, 951  
0160-4259  
0160-4048  
0160-4065  
0160-4835  
1901-1098  
CAP .22uF 10%  
CAP .022uF 20%  
CAP .luF 20%  
CAP .luF 10% 50V  
DIO-IN4150  
C952, 953  
C956, 957  
C958, 980  
D980, 981  
F980, 981  
6680A, 6681A  
6682A, 6683A, 6684A  
Q980  
2110-0697  
2110-0916  
1853-0510  
FU-SUBMIN 15A  
FU-SUBMIN 7A  
XSTR PNP  
R940  
6680A, 6681A  
6682A, 6683A  
6684A  
0811-3705  
0811-3691  
0699-1060  
RES .01 3W  
RES .025 3W  
RES .05 3W  
R94l  
6680A, 6681A  
6682A  
6683A, 6684A  
R945, 946  
6680A  
6681A  
6682A  
6683A  
6684A  
0811-3705  
0811-3691  
0699-1060  
RES .01 3W  
RES .025 3W  
RES .05 3W  
0698-3609  
0698-3614  
0698-3633  
0698-3637  
0698-3338  
0683-5605  
0699-0208  
0683-2755  
not used  
RES 22 5% 2W MO  
RES 43 5% 2W MO  
RES 390 5% 2W MO  
RES 820 5% 2W MO  
RES 1.5K 5% 2W MO  
RES 56 5% .25W  
R950, 951, 952, 953  
R954, 955, 958, 959  
R960  
RES l 5% .25W CF  
RES 2.7M 5% .25W  
R961  
R980  
R981  
R982  
R983, 984  
U900  
0757-0451  
0698-4416  
0757-0273  
0698-0082  
RES 24.3K 1%  
RES 169 1% .125W  
RES 3.01K 1%  
RES 464 1% .125W  
6680A 6681A  
6682A, 6683A, 6684A  
Z900, 901  
Q981, 982*  
6680A, 6681A  
6682A, 6683A, 6684  
1826-0890  
1826-1409  
1902-0960  
IC 358A  
LT1013  
DIO ZNR 12V 5%  
1855-0874  
1855-1003  
0340-1507  
5080-2212*  
POWER MOSFET  
POWER MODFET  
INSULATOR (REF Q981,982)  
CABLE Ref: J910 to CONTROL J510  
* not supplied as part of downprogrammer assy  
104 Replaceable Parts  
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Table 5-14. A10 Control Assembly, Replaceable Parts  
Agilent Part No. Description  
ELECTRICAL PARTS  
Ref. Desig.  
C500, 501, 502  
C503  
C504  
C505  
C506  
C507  
C508  
C509, 510  
C511  
C512  
C513  
C514, 515  
C516  
C517  
C518, 519  
C520  
C521  
C530, 531, 532  
C533, 534, 534  
C536, 537, 538  
C539  
C540, 541, 542, 543  
C544  
0180-4129  
0160-4835  
0180-4129  
0180-4131  
0160-4835  
0180-4136  
0160-4831  
0180-4129  
0160-5422  
0160-5644  
0160-4789  
0160-4805  
0160-5422  
0180-4129  
0160-4835  
0160-4822  
0160-4832  
0160-5422  
0160-4801  
0160-5422  
0160-4846  
0160-5469  
0160-4835  
0160-4801  
0180-2264  
CAP luF 35V  
CAP .luF 10% 50V  
CAP luF 35V  
CAP 4.7uF 35V  
CAP .luF 10% 50V  
CAP l0uF 20V  
CAP 4700pF 10%  
CAP luF 35V  
CAP .047uF 20%  
CAP .033uF 10%  
CAP 15pF 5% l00V  
CAP 47pF 5% l00V  
CAP .047uF 20%  
CAP luF 35V  
CAP luF 10% 50V  
CAP l000pF 5%  
CAP .0luF 10%  
CAP .047uF 20%  
CAP l00pF 5%  
CAP .047uF 20%  
CAP 1500pF l00V  
C-F luF 10% 50V  
CAP .luF 10% 50V  
CAP l00pF 5%  
C545, 546  
C547  
C-F 3.3uF 15V  
C548  
6680A, 6681A  
C556, 560  
C561  
C562  
C563, 564  
C565  
C566  
C567  
C568, 569  
C570  
C571  
C572  
C573  
C574  
C575, 576  
C577, 578  
C579, 580  
C581  
C583  
C584  
0160-4855  
0160-4835  
0160-4904  
0160-4791  
0160-4835  
0160-4791  
0160-4795  
0160-4904  
0160-4787  
0160-4795  
0180-4129  
0180-4131  
0160-4835  
0160-4805  
0160-5098  
0160-4824  
0160-4835  
0160-4797  
0160-4807  
0160-4797  
0160-4834  
0160-4835  
CAP 0.1uF 50V  
CAP .luF 10% 50V  
CAP 6800pF 5%  
CAP l0pF 5% l00V  
CAP .luF 10% 50V  
CAP l0pF 5% 100V  
CAP 4.7pF  
CAP 6800pF 5%  
C-F 22pF 5% l00V  
CAP 4.7pF  
CAP luF 35V  
CAP 4.7uF 35V  
CAP .luF 10% 50V  
CAP 47pF 5% l00V  
CAP .22uF 10%  
CAP 680pF l00v  
CAP .luF 10% 50V  
CAP 3.3pF  
CAP 33pF 5% l00V  
CAP 3.3pF  
CAP .047uF 10%  
CAP .luF 10% 50V  
C585  
C586  
C587  
6680A  
6681A  
6682A, 683A, 6684A  
0160-4814  
0160-4801  
0160-4813  
CAP 150pF 5%  
CAP l00pF 5%  
CAP 180pF 5%  
Replaceable Parts 105  
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Table 5-14. A10 Control Assembly, Replaceable Parts (continued)  
Ref. Desig.  
Agilent Part No.  
Description  
C588  
0160-4799  
CAP 2.2pF 5%  
CAP 680pF 5%  
C589, 590  
6680A, 6681A  
6682A, 6683A, 6684A  
C591  
not used  
0160-4824  
6680A  
6681A  
6682A, 683A, 6684A  
C592  
C594  
0160-4814  
0160-4801  
0160-4813  
0160-4835  
0160-4799  
0160-5098  
CAP 150pF 5%  
CAP l00pF 5%  
CAP 180pF 5%  
CAP .luF 10% 50V  
CAP 2.2pF  
C595  
CAP .22uF 10%  
C596  
6680A, 6681A  
6682A, 683A, 6684A  
C597  
0160-4811  
0160-4831  
0160-4795  
CAP 270pF 5%  
CAP 4700pF 5%  
CAP 4.7pF  
C598  
6680A, 6681A  
6682A, 6683A  
6684A  
C599, 600, 601  
C621  
0160-4831  
0160-4830  
0160-4831  
0160-4835  
0160-4795  
0160-5534  
CAP 4700pF 10%  
CAP 2200pF 10%  
CAP 4700pF 10%  
CAP .luF 10% 50V  
CAP 4.7pF  
C622  
CAP 0.luF 10% 63V  
C624  
6680A  
6681A  
6682A  
6683A, 6684A  
C625  
0160-5267  
0160-5410  
0160-4904  
0160-5267  
CAP 4700pF 5%  
CAP 3300pF 5%  
CAP 6800pF 5%  
CAP 4700pF 5%  
6680A  
6681A  
6682A  
6683A  
6684A  
C626, 627  
C628  
0160-4819  
0160-4846  
0160-4821  
0160-4824  
0160-4808  
0180-4136  
0160-4835  
0160-4799  
CAP 2200pF l00V  
CAP 1500pF l00V  
CAP 1200pF l00V  
CAP 680pF l0V  
CAP 470pF l0V  
CAP l0uF 20V  
CAP .luF 10% 50V  
CAP 2.2pF  
C629  
C630  
6680A  
6681A  
6682A  
6683A, 6684A  
C631  
0160-4904  
0160-5410  
0160-4812  
0160-4810  
CAP 6800pF 5%  
CAP 3300pF 5%  
CAP 220pF 5%  
CAP 330pF 5%  
6680A  
6681A  
6682A, 6683A, 6684A  
C632, 633  
C635, 636  
6680A  
6681A  
6682A  
6683A, 6684A  
C637  
0160-5534  
0160-5892  
0160-5469  
0160-4791  
CAP 0.luF 10%  
CAP 0.22uF 10%  
CAP luF 10%  
CAP l0pF 5% l00V  
0160-5468  
0160-5469  
0160-5892  
0160-5468  
CAP 0.47uF 10% 50V  
CAP luF 10% 50V  
CAP 0.22uF 10% 50V  
CAP 0.47uF 10% 50V  
6680A, 6681A  
6682A, 6683A, 6684A  
0160-4808  
0160-4812  
CAP 470pF 5%  
CAP 220pF 5%  
106 Replaceable Parts  
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Table 5-14. A10 Control Assembly, Replaceable Parts (continued)  
Ref. Desig.  
Agilent Part No.  
0160-4795  
0160-4835  
0160-5410  
0160-4805  
0160-4831  
0160-4833  
0160-7277  
0160-4832  
0160-5892  
0160-4183  
Description  
C639  
C640  
C641  
C645  
C648  
C650  
C651  
C652  
C653  
CAP 4.7pF  
CAP .luF 10% 50V  
CAP 3300pF 5%  
CAP 47pF 5% l00V  
CAP 4700pF 10%  
CAP .022uF 10%  
CAP 2.2uF 50V  
CAP .0luF 10%  
CAP 0.22uF 10%  
CAP l000pF 20%  
C654, 655  
C656  
6680A, 6681A  
6682A, 6683A, 6684A  
0160-5892  
0160-5469  
CAP 0.22uF 10%  
CAP luF 10% 50V  
C657  
6680A, 6681A  
6682A, 6683A, 6684A  
C658, 659  
C710, 711  
not used  
0160-5534  
0160-4183  
0160-4835  
CAP 0.luF 10%  
CAP l000pF 20%  
CAP .luF 10% 50V  
C715  
6680A, 6681A  
not used  
6682A, 6683A, 6684A  
C735  
D500, 501, 502  
D503, 504, 505,506,507,508  
D530, 531, 532,533,534,535  
D536, 538  
D539  
D540  
D560, 561  
D637  
D651, 652  
D653, 654  
D655, 656  
D657  
D658, 659  
D670  
0160-4824  
0683-1005  
1901-0731  
1901-1098  
1901-1098  
1901-1098  
1901-0880  
1901-1098  
1901-0880  
1901-1098  
1901-1098  
1901-0880  
1901-1098  
1901-0880  
1901-1098  
1901-0880  
1901-1098  
1901-0880  
1901-1098  
1251-7330  
1252-1992  
1252-1152  
1252-0055  
1252-0056  
1252-3693  
9140-0158  
1853-0510  
1855-0413  
0757-0346  
0698-3155  
0757-0273  
0757-0442  
0757-0434  
CAP 680pF 5%  
RES 10 5% .25W  
DIO-PWR RECT  
DIO-1N4150  
DIO-1N4150  
DIO-1N4150  
DIO GEN PRP  
DIO-1N4150  
DIO GEN PRP  
DIO-1N4150  
DIO-1N4150  
DIO GEN PRP  
DIO-1N4150  
DIO GEN PRP  
DIO-IN4150  
DIO GEN PRP  
DIO-IN4150  
DIO GEN PRP  
DIO-1N4150  
PHONE RECEPTABLE  
CONNECTOR 16 pin  
CONNECTOR 10 pin  
CONNECTOR 2 pin  
CONNECTOR 4 pin  
CONNECTOR 7 pin  
COIL lUH 10%  
D671  
D672, 673, 674, 675, 676  
D677, 678, 679, 680  
J507  
J509  
J510  
J511  
J512  
J513  
L500  
Q610  
Q621, 622, 623  
R500  
R501, 502  
R503  
R504  
XSTR PNP  
J-FET P-CHAN  
RES 10 1% .125W  
RES 4.64K 1%  
RES 3.01K 1%  
RES 10K 1% .125W  
RES 3.65K 1%  
R505  
Replaceable Parts 107  
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Table 5-14. A10 Control Assembly, Replaceable Parts (continued)  
Description  
Ref. Desig.  
Agilent Part No.  
0757-0289  
0698-3155  
0698-6323  
0757-0442  
0757-0289  
0698-3155  
0757-0472  
0757-0199  
0698-3279  
0757-0472  
0698-3456  
0698-3279  
0757-0442  
0698-3279  
0757-0442  
0757-0465  
0757-0289  
0757-0280  
0757-0442  
0699-1212  
0698-6392  
0757-0283  
1810-0305  
0698-4446  
0757-0273  
0698-3155  
0699-0070  
0757-0468  
R506  
R507  
R508  
R509  
R510  
R511  
R512  
R513  
R514  
R515  
R516  
R517  
R518  
R519  
R520  
R521  
R522  
R523, 524  
R525, 526  
R527  
R528  
R529  
R530  
R531  
R532  
R533  
RES 13.3K 1%  
RES 4.64K 1%  
RES 100.1%  
RES 10K 1% .125W  
RES 13.3K 1%  
RES 4.64K 1%  
RES 200K 1%  
RES 21.5K 1%  
RES 4.99K 1%  
RES 200K 1%  
RES 287K 1%  
RES 4.99K 1%  
RES 10K 1% .125W  
RES 4.99K 1%  
RES 10K 1% .125W  
RES 100K 1%  
RES 13.3K 1%  
RES lK 1% .125W  
RES 10K 1% .125W  
RES l9K .1%  
RES 22K .1%.125W  
RES 2K 1% .125W  
NETWORK-RES SIP  
RES 267 1% .125W  
RES 3.01K 1%  
RES 4.64K 1%  
RES 3.16M 1%  
RES 130K 1%  
R534  
R535  
R536  
6680A  
6681A  
6682A  
6683A  
0757-0290  
0757-0442  
0698-4486  
0698-6076  
0757-0457  
RES 6.19K 1% .125W  
RES 10K 1% .125W  
RES 24.9K 1%  
RES 39K 1%  
RES 47.5K 1%  
6684A  
R537  
6680A  
6681A  
6682A, 6683A  
6684A  
8159-0005  
0698-8827  
0699-0070  
not used  
RES 0.0  
RES lM 1%  
RES 3.16M 1%  
R538  
6680A, 6681A  
6682A  
6683A  
R539  
R540  
R550, 551, 552  
R553, 554  
R555  
R556  
R557  
0698-8827  
0699-1972  
0699-0070  
0757-0438  
0757-0428  
0757-0401  
0757-0465  
0757-0462  
0698-3450  
0757-0280  
0698-3456  
0698-4486  
0699-0642  
0698-3279  
RES lM 1%  
RES 1.74M 1%  
RES 3.16K  
RES 5.11K 1%  
RES 1.62K 1%  
RES 100 1% .125W  
RES 100K 1%  
RES 75K 1% .125W  
RES 42.2K 1%  
RES lK 1% .125W  
RES 287K 1%  
RES 24.9K 1%  
RES 10K .1% .lW  
RES 4.99K 1%  
R558, 559  
R560, 561, 562, 563  
R564, 565, 566, 567  
R568, 569  
108 Replaceable Parts  
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Table 5-14. A10 Control Assembly, Replaceable Parts (continued)  
Description  
Ref. Desig.  
R570, 580  
R581  
R582, 583  
R584  
R585  
R586  
R587  
R588, 589  
R590  
R591, 592  
R593  
Agilent Part No.  
0757-0424  
0757-0407  
0698-4486  
0757-0472  
0757-0434  
0757-0472  
0757-0407  
0757-0442  
0699-0070  
0757-0472  
0699-0070  
0757-0280  
0757-0273  
0757-0442  
0757-0199  
0757-0273  
0757-0427  
0757-0401  
0698-4446  
0698-3279  
0698-3430  
0698-4479  
0757-0429  
RES l.lK 1%  
RES 200 1% .125W  
RES 24.9K 1%  
RES 200K 1%  
RES 3.65K 1%  
RES 200K 1%  
RES 200 1% .125W  
RES 10K 1% .125W  
RES 3.16M 1%  
RES 200K 1%  
RES 3.16M 1%  
RES lK 1% .125W  
RES 3.01K 1%  
RES 10K 1% .125W  
RES 21.5K 1%  
RES 3.01K 1%  
RES 1.5K 1%  
R594  
R595  
R596  
R597  
R598  
R599, 600  
R601, 602  
R603  
R604  
R605, 606  
R607  
RES 100 1% .125W  
RES 267 1% .125W  
RES 4.99K 1%  
RES 21.5 1%  
RES 14K 1% .125W  
RES 1.82K 1%  
R608, 609  
R610  
6680A  
0757-0462  
0757-0465  
0757-0465  
0698-3450  
0757-0442  
0698-3155  
0698-3279  
0698-3162  
0757-0410  
0698-0082  
0757-0410  
0757-0453  
RES 75K 1%  
RES l00K 1%  
RES l00K 1%  
6681A, 6682A  
6683A, 6684A  
R611  
R612  
R613  
R614  
R615  
R616  
R617  
RES 42.2K 1%  
RES l0K 1% .125W  
RES 4.64K 1%  
RES 4.99K 1%  
RES 46.4K 1%  
RES 301 1% .125W  
RES 464 1% .125W  
RES 301 1% .125W  
RES 30.1K 1%  
R618  
R619  
R620  
6680A, 6681A  
6682A  
6683A, 6684A  
R621  
not used  
0698-3136  
0757-0446  
RES 17.8K 1%  
RES 15K 1%  
6680A, 6681A  
6682A  
6683A  
0757-0453  
0757-0462  
0757-0467  
0757-0469  
RES 30.1K 1%  
RES 75K 1%  
RES 121K 1%  
RES 150K 1%  
6684A  
R622  
6680A, 6681A  
6682A  
6683A, 6684A  
R623  
not used  
0698-3136  
0757-0446  
RES 17.8K 1%  
RES 15K 1%  
6680A, 6681A  
6682A  
6683A  
0757-0453  
0757-0462  
0757-0467  
0757-0469  
RES 30.1K 1%  
RES 75K 1%  
RES 121K 1%  
RES 150K 1%  
6684A  
Replaceable Parts 109  
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Table 5-14. A10 Control Assembly, Replaceable Parts (continued)  
Ref. Desig.  
Agilent Part No.  
Description  
R624  
R625  
0757-0453  
RES 30.1K 1%  
6680A, 6681A  
6682A  
6683A, 6684A  
0698-3455  
0757-0461  
0699-1972  
RES 261K 1%  
RES 68.1K 1%  
RES 1.74M 1%  
R626  
6680A, 6681A  
6682A  
6683A, 6684A  
R627, 628  
R629  
R632  
R633  
R634  
R635  
0698-3455  
0699-0088  
0757-0480  
0698-3455  
0698-4479  
0757-0273  
0757-0465  
0757-0442  
0698-3450  
0757-0280  
RES 261K 1%  
RES 1.21M 1%  
RES 432K 1%  
RES 261K 1%  
RES 14K 1% .125W  
RES 3.01K 1%  
RES 100K 1%  
RES 10K 1% .125W  
RES 42.2K 1%  
RES lK 1% .125W  
R636  
R637  
6680A, 6681A, 6682A  
6683A  
6684A  
0757-0465  
0757-0466  
0757-0464  
0698-3279  
RES 100K 1%  
RES 110K 1%  
RES 90.0K 1%  
RES 4.99K 1%  
R638  
R639  
6680A, 6681A  
6682A  
6683A  
6684A  
R640  
0757-0463  
0757-0464  
0757-0466  
0757-0464  
0698-3279  
RES 82.5K 1%  
RES 90.9K 1%  
RES 110K 1%  
RES 90.9K 1%  
RES 4.99K 1%  
R641  
6680A, 6681A  
6682A, 6683A, 6684A  
R642  
R643  
R644  
0757-0452  
0698-3156  
0757-0410  
0757-0429  
0757-0434  
RES 27.4K 1%  
RES 14.7K 1%  
RES 301 1%  
RES 1.82K 1%  
RES 3.65K 1%  
R645  
6680A  
0698-8827  
0699-0070  
0699-0070  
RES lM 1%  
RES 3.16M 1%  
RES 3.16M l%  
6681A, 6682A  
6683A, 6684A  
R646  
6680A, 6681A  
6682A, 6683A, 6684A  
R658, 659  
R660  
0699-0088  
0698-3215  
0757-0278  
0698-8827  
RES 1.2M 1%  
RES 499K 1%  
RES 1.78K 1%  
RES lM 1% .125W  
R661  
6680A  
6681A  
6682A  
6683A, 6684A  
R662  
R663  
R664  
R665  
0757-0433  
0757-0430  
0757-0427  
0757-0280  
0757-0273  
0698-3456  
0698-3155  
0757-0273  
RES 3.32K 1%  
RES 2.21K 1%  
RES 1.5K 1%  
RES lK 1%  
RES 3.01K 1%  
RES 287K 1%  
RES 4.64K 1%  
RES 3.01K 1%  
110 Replaceable Parts  
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Table 5-14. A10 Control Assembly, Replaceable Parts (continued)  
Ref. Desig.  
Agilent Part No.  
Description  
R666  
6680A  
6681A, 6682A  
6683A  
0698-8913  
0683-2255  
0683-4755  
0683-5655  
RES 1.5M 1%  
RES 2.2M 1%  
RES 4.7M 1%  
RES 5.6M 1%  
6684A  
R667  
6680A  
6681A  
0757-0465  
0757-0462  
0698-3455  
0757-0473  
0698-3279  
RES l00K 1  
RES 75K 1%  
RES 261K 1%  
RES 221K 1%  
RES 4.99K 1  
6682A, 6683A  
6684A  
R668  
R669  
6680A  
6681A  
6682A  
6683A  
6684A  
0757-0462  
0698-4503  
0757-0273  
0757-0480  
0698-3456  
RES 75K 1%  
RES 66.5K 1%  
RES 3.01K 1%  
RES 432K 1%  
RES 287K 1%  
R670  
6680A  
6681A, 6682A  
6683A, 6684A  
R671  
R672  
6680A  
6681A, 6682A  
6683A, 6684A  
R673  
R674  
R675  
R677  
0699-1742  
0699-1211  
0699-0460  
0699-0070  
RES 70K 1%  
RES 95K 1%  
RES 85K 1%  
RES 3.16M 1%  
0698-8093  
0699-0118  
0699-0461  
0699-2247  
0699-0461  
0698-3279  
0699-0461  
RES 40K 1%  
RES 20K 1%  
RES 30K .1%  
RES 121K .05%  
RES 30K .1% .lW  
RES 4.99K 1%  
RES 30K .1% .lW  
R678, 679  
6680A  
6681A, 6682A  
6683A, 6684A  
R680  
0699-3414  
0699-2246  
0699-2246  
RES 45K  
RES 25K 0.05%  
RES 25K 0.05%  
6680A, 6681A  
6682A  
6683A  
0699-3103  
0699-2248  
0699-2879  
0699-3416  
RES l9K 0.05%  
RES 47.5K 0.05%  
RES 80K 0.05%  
RES l00K 0.05%  
6684A  
R681  
6680A, 6681A  
6682A  
6683A  
0699-3103  
0699-2248  
0699-2879  
0699-3416  
RES l9K 0.05%  
RES 47.5K 0.05%  
RES 80K 0.05%  
RES l00K 0.05%  
6684A  
R682  
6680A  
6681A  
6682A  
6683A, 6684A  
R683  
0698-6322  
0698-7163  
0698-8061  
0698-6322  
RES 4K 0.1%  
RES 2.0081K 0.1%  
RES 8.25K 0.1%  
RES 4K 0.1%  
6680A  
6681A  
6682A  
6683A, 6684A  
0698-6322  
0698-7163  
0698-8061  
0698-6322  
RES 4K 0.1%  
RES 2.0081K 0.1%  
RES 8.25K 0.1%  
RES 4K 0.1%  
Replaceable Parts 111  
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Table 5-14. A10 Control Assembly, Replaceable Parts (continued)  
Ref. Desig.  
Agilent Part No.  
Description  
R684  
6680A  
6681A  
6682A  
6683A  
6684A  
0757-0280  
0757-0289  
0757-0430  
0698-3496  
0757-0436  
RES lK 1%  
RES lK 1%  
RES 2.21K 1%  
RES 3.57K 1%  
RES 4.32K 1%  
R685  
6680A  
6681A  
6682A  
. 6683A  
6684A  
0757-0280  
0757-0289  
0757-0430  
0698-3496  
0757-0436  
RES lK 1%  
RES lK 1%  
RES 2.21K 1%  
RES 3.57K 1%  
RES 4.32K 1%  
R686  
6680A  
6682A  
6683A  
6684A  
R687  
R689  
8159-0005  
0698-8911  
0699-0486  
8159-0005  
0698-8093  
0698-5365  
RES 0.0  
RES 1.3K .1%  
RES 2.0K .1%  
RES 0.0  
RES 40K .1% .lW  
RES 3.48K .1%  
R690  
6680A, 6681A  
6682A, 6683A  
6684A  
0757-0395  
0757-0403  
0698-6362  
RES 56.2  
RES 121  
RES 1.0K .1%  
R691  
6680A, 6681A  
6682A  
6683A  
6684A  
R692  
R693, 694  
R695  
R696, 697  
R698, 699  
R701, 702  
R703  
0699-1011  
0698-8911  
0698-7163  
0698-8911  
0698-6620  
0698-3430  
0698-8093  
0698-6414  
0698-6323  
0757-0442  
RES 3.32K .1%  
RES 1.3K .1%  
RES 2.0081K .1%  
RES 1.3K .1%  
RES 150K .1%  
RES 21.5 1%  
RES 40K .1% .lW  
RES lK .1% .lW F  
RES 100 1%  
RES 10K 1% .125W  
6680A  
0757-0446  
0757-0443  
0757-0443  
0683-1065  
RES 15K 1%  
RES 11K 1%  
RES 11K 1%  
RES 10M 5% .25W  
6681A, 6682A  
6683A, 6684A  
R704  
R705  
6680A  
0699-0070  
0683-2255  
0683-2255  
8159-0005  
RES 3.16M  
RES 2.2M  
RES2.2M  
RES-ZERO OHMS  
6681A, 6682A  
6683A, 6684A  
R706  
R707  
6680A  
0699-0088  
0698-8826  
0698-8826  
RES 1.21M  
RES 825K  
RES 825K  
6681A, 6682A  
6683A, 6684A  
R708  
6680A  
6681A, 6682A  
6683A, 6684A  
0698-3459  
0698-3455  
0698-3455  
RES 383K  
RES 261K  
RES 261K  
112 Replaceable Parts  
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Table 5-14. A10 Control Assembly, Replaceable Parts (continued)  
Ref. Desig.  
Agilent Part No.  
Description  
R709  
6680A  
6681A, 6682A  
6683A, 6684A  
0757-0468  
0757-0464  
0757-0464  
RES 130K  
RES 90.9K  
RES 90.9K  
R710  
6680A  
6681A, 6682A  
6683A, 6684A  
0698-5091  
0698-3160  
0698-3160  
0698-5091  
0698-0082  
0757-0442  
0757-0349  
0757-0447  
0698-3449  
RES 45K  
RES 31.6K  
RES 31.6K  
RES 45K  
RES 464 1% .125W  
RES 10K 1% .125W  
RES 22.6K 1%  
RES 16.2K 1%  
RES 28.7K 1%  
R711  
R712  
R713  
R714  
R715  
R716  
R717  
6680A, 6681A  
6682A, 6683A, 6684A  
R718  
R719  
R720  
R721  
R724  
R725  
not used  
0757-0442  
0698-3162  
0757-0458  
0698-8093  
0698-6630  
0698-3279  
RES 10K  
RES 46.4K 1%  
RES 51.1K 1%  
RES 40K .1% .lW  
RES 20K .1%  
RES 4.99K 1%  
6680A, 6681A  
6682A, 6683A, 6684A  
R726  
R727, 728  
R729  
R730, 731  
R732  
R733  
not used  
0757-0199  
0698-6359  
0698-6630  
0698-6359  
0698-6630  
0698-6619  
0699-0489  
0683-2255  
0698-8959  
RES 21.5K  
RES 80K .1%  
RES 20K .1%  
RES 80K .1%  
RES 20K .1%  
RES 15K .1%  
RES 16.15K .1%  
RES 2.2M 5% .25W  
RES 619K 1%  
R734  
R738  
R741  
6680A  
6681A  
6682A  
6683A  
6684A  
R742  
R743  
R744  
R745  
RT500  
S500  
0757-0429  
0698-3496  
0757-0436  
0698-3496  
0698-3151  
0698-4509  
0698-8093  
0683-0475  
0698-6630  
0837-0397  
3101-1973  
1826-2341  
1826-1370  
1826-0346  
1826-1369  
RES 1.82K  
RES 3.57K  
RES 4.32K  
RES 3.57K  
RES 2.87K  
RES 80.6K 1%  
RES 40K .1% .lW  
RES 4.7 5% .25W  
RES 20K .1%  
Thermistor  
SW-SL 7-lA  
IC-REG TL7702BCP  
IC 365  
U500  
U501, 502  
U503  
IC OP AMP  
IC-VOLTAGE REG  
U504  
Replaceable Parts 113  
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Table 5-14. A10 Control Assembly, Replaceable Parts (continued)  
Description  
Ref. Desig.  
Agilent Part No.  
5080-2305  
1820-3079  
1826-2187  
1826-1896  
1826-1370  
1820-3081  
1826-1231  
1826-1409  
1820-3199  
1820-2922  
1820-3081  
1826-2343  
1820-2922  
1826-0065  
1858-0083  
1826-0962  
1826-0890  
1826-1343  
1826-1409  
1826-1895  
1826-1896  
1826-0161  
1902-3114  
1902-0777  
1902-1377  
U506  
U507  
U510, 511, 512  
U513, 514, 515  
U516, 517  
U518  
U520  
U521, 522  
U600  
U601  
U602  
U603  
U604  
U605  
U606  
U607, 608  
U609  
U610  
U620, 621  
U622  
U623  
U624  
Z500  
PRGMD-IC, SEC  
IC MC74HC138N  
IC-CONVERTER,DIA  
IC-LINEAR  
IC 365  
IC MC74HC74N  
DIA 8-DGT  
IC 1013  
IC MC74HC4040N  
IC MC74HC00N  
IC MC74HC74N  
IC-VRGLTR,SWG  
IC MC74HC00N  
IC 311  
XSTR ARY 14P-DIP  
IC 412  
IC 358A  
IC-VOLTAGE REG  
IC 1013  
PRECISION OP-AMP  
IC-LINEAR  
IC 324  
DIO-ZNR 6.19V 2%  
DIO-ZNR lN825  
DIO-ZNR 6.19V  
Z501  
Z641  
114 Replaceable Parts  
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6
Diagrams  
Introduction  
This chapter contains drawings and diagrams for troubleshooting and maintaining Agilent Series 668xA Power Supplies.  
Unless otherwise specified, a drawing or diagram applies to all models of the series. Wiring connections to external  
equipment are shown in the Power Supply Operating Manual.  
Chapter Organization  
Table 6-1 summarizes the contents of this chapter.  
Table 6-1. Summary of Chapter Contents  
Function  
Description  
See  
Figure 6-2  
Interconnections  
Drawing identifying each circuit board, the cables between boards, and  
schematic diagram for each board.  
Schematics  
Show test points, signal mnemonics, component-location grid coordinates,  
and specific notes. General notes applicable to all schematics are given in  
Table 6-4.  
Al Front Panel Board.  
LED Board.  
A2 GPIB Board.  
A3 FET Board.  
A4 AC Input Power Board.  
A5 DC Rail Board.  
A6 Bias Board.  
A7 Snubber Board.  
A8 Fast Sense Board.  
A9 Down Programming/Slow Sense Board.  
A10 Control Board.  
Signal names  
Parts location  
Table of signal name mnemonics  
Table 6-2  
A drawing that shows the location of components on a circuit board is  
located next to the above circuit board schematic diagram.  
Figure 3-18  
A drawing showing location of each circuit board in the chassis is in  
Chapter 3.  
Test points  
Description of each test point. Location of each test point is shown on the  
appropriate schematic and its associated parts location drawing.  
Table 6-3  
Diagrams 115  
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Table 6-2. Signal Name Mnemonics  
Mnemonic  
A(0)--A(15)  
AD (O)--AD(7)  
AMB_SENSE  
ANA(0)--ANA(7)  
ATN  
Description  
Address lines  
Mnemonic  
MSRQ  
NDAC  
NEG_IMON  
NRFD  
OV  
Description  
Microprocessor service request  
Not data accepted (GPIB)  
Negative current monitor  
Not ready or data (GPIB)  
Overvoltage  
Address bus  
Ambient temperature sense  
Analog Signal readback bus  
Attention (GPIB)  
BIAS_OK  
BOVPROG  
BSTX  
cc  
CCPROG  
cv  
CVPROG  
D(0)_D(7)  
D101--Dl08  
DAV  
DFI  
DFI-EN  
DPS  
DN_PGM  
DRIVE_A/B  
EOI  
FAC_CAL  
FAN_PWM  
FPRX  
OV_CLR  
OVCMP  
OVP_BIAS  
OVPROG  
OVSCR  
PCLR  
PREF  
PREF_2  
PREN  
PRX  
PTX  
PWM_EN  
RAM  
RDY  
REN  
Overvoltage clear  
15V bias supplies have stabilized  
BuFfered OV programming  
BuFfered secondary transmit  
Constant current status  
Constant current programming  
Constant voltage status  
Constant voltage programming  
Data lines  
Data lines (GPIB)  
Data valid (GPIB)  
Discrete fault indicator  
Discrete fault indicator enable  
Downprogramming shunt  
Down programming  
FET drive signals  
End or identify (GPIB)  
Factory calibration  
Fan pulse width modulation  
Front panel receive serial data  
Front panel transmit serial data  
Fast sense  
Overvoltage comparator  
Overvoltage protection bias  
Overvoltage programming  
Overvoltage SCR (crowbar)  
Primary power clear  
Primary reference voltage (2.53V)  
Primary reference voltage (1.0V)  
Primary remote enable  
Primary receive serial data  
Primary transmit serial data  
Pulse width modulator enable  
Random access memory  
Ready  
Remote enable  
Remote inhibit  
Read only memory  
Secondary power clear  
Receive serial data  
RI  
ROM  
SPCLR  
RX  
RxD  
FPTX  
FS  
Receive Serial Data  
Signature analysis  
SA  
HSRQ  
IFC  
IMON  
INH_CAL  
IP  
GPIB service request  
Interface clear (GPIB)  
Current monitor  
Inhibit calibration  
External current programming  
SRQ  
SRX  
STX  
TxD  
Service request (GPIB)  
Secondary receive serial data  
Secondary transmit serial data  
Transmit Serial Data  
Universal asynchronous  
receive/transmit  
UART  
IPROG  
ISEN  
Current programming  
Current sense  
VMON  
vos  
Voltage monitor  
Voltage offset  
ISRQ  
KO(0)-KO(5)  
KI(0)--KI(5)  
Interface service request  
Keypad output data bus  
Keypad input data bus  
VPROG  
WR  
Voltage programming  
Write  
116 Diagrams  
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Table 6-3. Test Points  
Signal Tested  
TEST POINT No. & Loc.  
Measurement and Conditions  
A2 GPIB BOARD  
Primary/chassis ground  
Connect meter or scope common here. Then  
make measurements at test points  
J106-4  
through  
.
+ 5V primary bias  
+ 5V + 0.2V  
U101- 1  
U101-6  
PCLR  
Goes high for approximately 40 ms at power on,  
then goes low.  
PCLR*  
STX  
Held low for approximately 40 ms at power on,  
then goes high.  
Primary transmit to secondary serial data line.  
Toggles between 0 and +5V.  
Primary receive from secondary serial data line.  
Toggles between 0 and +5V.  
Primary receive from front panel serial data  
line. Toggles between 0 and +5V.  
Primary transmit to front panel serial data line.  
Toggles between 0 and +5V.  
U101-8  
U110-3  
U111-6  
U119-4  
U119-18  
SRX  
FPRX  
FPTX  
AC Input Board  
and or  
Connect meter between TP  
and  
or  
and  
and measure approximately 220VAC or  
,
,
,
440VAC. Measurements at test points Rthrough X.  
AC Mains Voltage  
J418-1/J417-7  
J418-2/J417-8  
J418-3/J417-9  
K402 coil  
AC Mains Voltage  
AC Mains Voltage  
24VDC Coil Voltage  
Turns on PS, and after power-on initialization  
test, reads approximately 24VDC.  
DC Rail Board  
Rail #1 Voltage  
Rail #2 Voltage  
Measure approximately 290VDC  
Measure approximately 290VDC  
J430-1 (+) to J430-2 (-)  
J431-1 (+) to J431-2 (-)  
Bias Board  
GPIB 5V Bias  
Fan voltage  
+15 0.9V measure approx. 11VAC  
Measure 24VDC  
J801-4 to J801-5  
J801-1 (+) to J801-2 (-)  
J827-1 (+) to J827-2 (-)  
J827-1 (+) to J827-3 (-)  
Inrush relay coil  
Rail relay coil  
Measure 24VDC  
Measure 24VDC after power-on initialization  
test.  
24V Primary  
Measure approximately 34VAC  
R331  
-15Vs secondary bias  
-25V  
-15 0.9V  
R330  
-22.5V to -27.5V  
+C354  
U310-16  
U308-6  
U308-7  
RELAY ON*  
RESET  
0V  
0V  
BIAS OK  
+5V  
Diagrams 117  
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Table 6-3. Test Points (continued)  
Signal Tested  
TEST POINT No. & Loc.  
Measurement and Conditions  
Bias Board (continued)  
PREF  
+2.5V  
U308-1  
U308-5  
RESET*  
Held low for approximately 50 ms at power-on,  
then goes high.  
+3V  
FAN DETECT  
-25V  
U311-7  
D317  
+3V  
FAN_PWN  
+0.6V  
U311-2  
A3 FET Board  
are on the A3 FET Board. Troubleshooting procedures at these points are given under  
Test points  
through  
Dynamic Troubleshooting section of the FET Troubleshooting Chart (Table 3-4).  
A10 Control Board  
Secondary common (Sheet 1)  
CC/CC DACs reference (Sheet 1)  
Readback DAC reference (Sheet 1)  
CVPROG (Sheets 2,4)  
+C500  
U504-6  
U503-7  
U513-6  
U514-6  
CVPROG (Sheets 2,4)  
NOTE:  
Measurements at test points through where taken under the following conditions:  
1. Programming  
a. Voltage = ½ scale  
b. Current = ½ scale  
c. OV = full scale  
2. First measurement in CV mode with no load.  
3. Second measurement in CC mode with output shorted.  
VMON (Sheet 4)  
U621-1  
U621-7  
U502-2  
U624-1  
U622-6  
U620-7  
U620-1  
U502-3  
Y608-7  
U607-7  
U607-1  
U602-9  
U605-3  
U602-6  
U605-7  
CV CONTROL (Sheet 4)  
CV* (Sheet 4)  
CV mode =0V  
CV mode =+2.2V  
CV mode =0V  
CV mode =0V  
CV mode =+10V  
CV mode =+5V  
CV mode = -4V  
See Figure 6-1  
See Figure 6-1  
See Figure 6-1  
See Figure 6-1  
See Figure 6-1  
See Figure 6-1  
CC mode = 5V  
CC CLAMP AMP output (Sheet 4)  
1ST I AMP output (Sheet 4)  
2ND I AMP output (Sheet 4)  
CC CONTROL (Sheet 4)  
CC* (Sheet 4)  
CC mode = +2.2V  
CC mode = -0.4V  
CC mode = +4.5V  
CC mode = +0.4V  
CC mode = 0V  
FAST SENSE AMP (Sheet 3)  
RAMP GEN (Sheet 3)  
CC mode = 0V  
RAMP GEN (Sheet 3)  
DIVIDER output (Sheet 3)  
SUMMING POINT (Sheet 3)  
DEADTIME LATCH (Sheet 3)  
SUMMING COMPARATOR  
(Sheet 3)  
118 Diagrams  
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Table 6-3. Test Points (continued)  
Signal Tested  
TEST POINT No. & Loc.  
Measurement and Conditions  
A10 Control Board (continued)  
DIVIDER CLOCK (Sheet 3)  
DIVIDER RESET (Sheet 3)  
ON LATCH CLOCK (Sheet 3)  
ON LATCH (Sheet 3)  
See Figure 6-1  
U600-10  
U601-6  
U601-3  
U604-3  
U603-3  
See Figure 6-1  
See Figure 6-1  
See Figure 6-1  
PWM_EN (Sheet 3)  
Held high for approximately 12 seconds at  
power-on, then goes low.  
+5 0.2V  
VOS (Sheet 3)  
U603-13  
NOTE: Temporarily move both scope leads to J511 for TP  
DRV A, DRV B (Sheet 3)  
See Figure 6-1  
J511-1,2  
U502-14  
U501-7  
Q602,C  
+5V  
OVREF (Sheets 1,3)  
+5.4V  
DP CONTROL (Sheet 3)  
CV Mode  
Not Applicable  
CV Mode  
+13V  
CC Mode  
-0.14V  
CC Mode  
0V  
DP CONTROL (Sheet 3)  
U608-7  
PREF_2 (Sheets 1,3)  
+1V  
U630-11  
U630-12  
D660-AN  
U502-12  
DN PGM (Sheets 1,3)  
DP_TST (Sheet 3)  
0V  
0V  
OV COMPARATOR (Sheet 3)  
CV Mode  
+1.5V  
CC Mode  
+3.25V  
General Schematic Notes  
The following table lists summary information about notes appearing in schematic diagrams.  
Table 6-4. General Schematic Notes  
1. All resistors are in ohms 1%, 1/8W, unless otherwise specified.  
2. All capacitors are in microfarads unless otherwise specified.  
3. Signal lines that are terminated by flags continue on other sheets, and may also go to other locations on the same sheet.  
Example: CVPROG (SH.2 8C); "SH.2 8C" indicates the sheet number and the coordinates on that sheet where the  
CVPROG signal line goes.  
4. Unterminated signal lines go to a least one other location on the same sheet.  
5. Unless otherwise noted, bias connections to integrated-circuit packages are as follows:  
Common  
pin 7  
pin 8  
+ 5V  
pin 14  
pin 16  
pin 20  
14-pin packages  
16-pin packages  
20-pin packages  
pin 10  
Diagrams 119  
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Figure 6-1. Test Point Waveforms for Table 6-3  
120 Diagrams  
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Figure 6-2. Circuit Board Cabling Diagram  
Diagrams 121  
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Figure 6-3. A1 Front Panel Board, Component and Test Point Location  
122 Diagrams  
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Figure 6-4. A1 Front Panel Board, Schematic Diagram  
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Figure 6-5. LED Board, Component and Test Point Location  
Figure 6-6. LED Board, Schematic Diagram  
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Figure 6-7. A2 GPIB Board, Component Location  
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2
3
4
5
6
7
1
8
Figure 6-8. A2 GPIB Board, Schematic Diagram  
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Figure 6-9. A3 FET Board, Component and Test Point Location  
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Figure 6-10. A3 FET Board, Schematic Diagram (sheet 1 of 2)  
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Figure 6-10. A3 FET Board, Schematic Diagram (sheet 2 of 2)  
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12  
11  
10  
9
Figure 6-11. A4 AC Input Board, Component and Test Point Location  
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Figure 6-12. A4 AC Input Board, Schematic Diagram  
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13  
14  
Figure 6-13. A5 DC Rail Board, Component and Test Point Location  
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13  
14  
Figure 6-14. A5 DC Rail Board, Schematic Diagram  
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19  
17  
18  
16  
15  
Figure 6-15. A6 Bias Board, Component and Test Point Location  
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19  
Figure 6-16. A6 Bias Board, Schematic Diagram (Sheet 1of 2)  
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17  
18  
16  
15  
Figure 6-16. A6 Bias Board, Schematic Diagram (Sheet 2 of 2)  
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Figure 6-17. Power Mesh, Schematic Diagram, Models 6680A, 6681A Only  
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Figure 6-18. Power Mesh, Schematic Diagram Models 6682A, 6683A, 6684A Only  
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Figure 6-19. A7 Snubber Board, Component Location  
Figure 6-20. A7 Snubber Board, Schematic Diagram  
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Figure 6-22. A8 Fast Sense Board, Schematic Diagram  
Figure 6-21. A8 Fast Sense Board, Component Location  
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Figure 6-23. A9 Down Programming/Slow Sense, Component Location  
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Figure 6-24. A9 Down Programming/Slow Sense, Schematic Diagram  
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3
5
38  
0
5
3
6
55  
9
4
3
4
8
4
1
5
46  
42  
47  
41  
5
4
4
4
37  
21  
36  
22  
20  
39  
40  
56  
58  
6
4
57  
52  
54  
60  
36  
5
9
62 61  
Figure 6-25. A10 Control Board, Component and Test Point Location  
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21  
22  
20  
36  
37  
38  
63  
Figure 6-26. A10 Control Board, Schematic Diagram (Sheet 1 of 4)  
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39  
40  
64  
Figure 6-26. A10 Control Board, Schematic Diagram (Sheet 2 of 4)  
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50  
58  
54  
56  
52  
57  
51  
61  
59  
53  
49  
60  
55  
62  
65  
66  
Figure 6-26. A10 Control Board, Schematic Diagram (Sheet 3 of 4)  
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43  
39  
41  
48  
47  
42  
45  
46  
40  
44  
Figure 6-26. A10 Control Board, Schematic Diagram (Sheet 4 of 4)  
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A
Backdating  
Manual backdating describes changes that must be made to this manual for power supplies whose serial numbers are lower  
than those listed in the title page to this manual.  
Look in the following table and locate your Agilent model. Then look at each serial number listed for this group. If the  
serial number of your power supply is prior to any of the serial number(s) listed, perform the change indicated in the  
Change column. Note that, several changes can apply to your supply.  
Serial Numbers  
Change  
Model 6680A  
Serial Numbers  
Change  
Model 6683A  
3318A 00111  
3318A 00116  
3502A 00126  
3619A 00167  
1, 2, 4, 5, 6  
3349A 00104  
3349A 00108  
3514A 00123  
3514A 00178  
3619A 00203  
6
3
7
8
3
7
9
9
Model 6681A  
Model 6684A  
3319A 00154  
3336A 00164  
3350A 00172  
3350A 00183  
3350A 00193  
3506A 00218  
3619A 00383  
4
1
2, 6  
5
3
3339A 00103  
3405A 00108  
3405A 00109  
3514A 00118  
3514A 00188  
3514A 00257  
5
3
6
7
8
9
7
9
Model 6682A  
3349A 00104  
3349A 00108  
3514A 00123  
3514A 00168  
3624A 00193  
6
3
7
8
9
CHANGE 1  
In Table 5-14 A10 Control Board  
C548, 0.1uF 50V, Agilent P/N 0160-4835 in parallel with RT500.  
CHANGE 2  
DELETE  
In Table 5-7 A3 FET Board  
DELETE  
C228 & 231, 2000pF 100V P/N 0160-2301.  
C228, 6800pF 100V P/N 0160-4904.  
ADD  
R247, from 75K P/N 0757-0462, to 42.2K 1% 1/8W P/N 0698-3450.  
R249, from 13.1K P/N 0757-0444, to 7.5K 1% 1/8W P/N 0757-0440  
R250, from 60.4K P/N 0698-3572 to 40.2K 1% 1/8W P/N 0698-3499.  
R253, from 12.5K P/N 0698-6533 to 17.8K 1% 1/8W P/N 0698-3136.  
C229, from 0.022uF P/N 0160-4918 to 0.01uF 100V Ceramic P/N 0160-4832.  
CHANGE  
Backdating 149  
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In Table 5-9 A5 DC Rail Board  
C418, 0.022uF 250VAC "Y" rated P/N 0160-4048  
DELETE  
Fuse Clips, REF F420 & 421 1/4" P/N 2110-0726, qty, 4.  
Fuse Holder, REF F420 & 421, 5 x 30mm P/N 2110-0689, qty 2.  
F420 & 421, from 0.5A 500V P/N 2110-0934 to 0.5A 500V 5x30mm P/N 2110-0921.  
ADD  
CHANGE  
CHANGE 3  
In Table 5-14 Al0 Control Board  
C548, 0.1uF 50V P/N 0160-4835. in parallel with RT500.  
DELETE  
RT500, P/N 0837-0412.  
Pins, P/N 0360-1498, qty. 2.  
CHANGE 4  
In Table 5-14 Al0 Control Board  
ASSEMBLY, relay contactor P/N 5060-3593, qty. 1.  
DELETE  
Dust cover for relay, P/N 9222-1870.  
Retainer clip for relay, P/N 1460-2317.  
Relay, P/N 0490-1919.  
ADD  
CHANGE 5  
In Table 5-8 A4 AC Input Board  
C428, 429, and 430, P/N 0160-7898.  
DELETE  
R435, 436, and 437, P/N 0698-3609.  
CHANGE 6  
In Table 5-6 A2 GPIB Board  
CHANGE  
A2 GPIB board from P/N 5060-3591 to P/N 5060-3552. (see Table A-1 and Figure A-1)  
CHANGE 7  
In Table 5-6 A2 GPIB Board  
CHANGE  
U114 from P/N 1826-0536, to LM309K P/N 1820-0430.  
CHANGE 8  
In Table 5-13 A9 Downprogrammer/Slow Sense Board  
Q981, 982 from P/N 1855-1003, to POWER MOSFET P/N 1855-0835.  
Insulator, REF Q981, 982.  
CHANGE 9  
CHANGE  
DELETE  
In Table 5-10 A1 Front Panel Board  
KNOB (Ref. RPG) from P/N 0370-3238, to P/N 10370-1091.  
RPG - OPTICAL ENCODER from P/N 0960-0912 to P/N 0960-0822.  
U4 from 5080-2466 to P/N 5080-2304.  
CHANGE  
PCA (keypad), P/N 5063-3407.  
DELETE  
150 Backdating  
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Table A-1. A2 GPIB Parts List  
Ref Desig.  
Agilent Part No.  
Description  
ELECTRICAL PARTS  
C102-105  
C106  
C107,108  
C109-111,114,115,121  
C122  
C123  
C124  
C125  
C126,127  
C128  
C129-134  
C135  
C136  
C138-140  
D107-110  
D111-114  
D115,116  
D119,120  
F101  
J101  
J106  
J107,108,114,115  
L101  
P101  
Q101  
R103  
R104  
R105  
R106  
R107  
R108  
R109  
R111,114  
R115-117  
R118  
R119  
R120-122  
R123  
0160-4822  
0180-0155  
0160-4787  
0160-5422  
0180-3325  
0160-4822  
0180-0228  
0160-5422  
0160-4807  
0160-4281  
0160-5422  
0180-0228  
0160-4803  
0160-5422  
1901-0731  
1901-1098  
1901-1080  
1902-0766  
2110-0699  
1252-0268  
1251-4926  
1251-7330  
9100-1610  
1251-4245  
1853-0089  
0757-0442  
0698-3155  
0683-1065  
0698-4037  
0698-0082  
0757-0401  
0698-0082  
0698-3155  
0698-4037  
0757-0280  
0698-8827  
0698-3155  
0698-0082  
0698-3155  
0683-1015  
0698-3155  
0757-0401  
Capacitor 1000pF 5%  
Capacitor 2.2µF 20V  
Capacitor 22pF 5% 100V  
Capacitor 0.047µF 20%  
Capacitor 25V  
Capacitor 1000pF 5%  
Capacitor 22µF 15V  
Capacitor 0.047µF 20%  
Capacitor 33pF 5% 100V  
Capacitor 2200pF 20%  
Capacitor 0.047µF 20%  
Capacitor 22µF 15V  
Capacitor 68pF 5% 100V  
Capacitor 0.047µF 20%  
Diode power rectifier  
Diode 1N4150  
Diode 1N5817  
Diode zener 18.2V 5%  
Fuse subminature 5AM, 125V  
Connector receptacle (GPIB)  
Connector receptacle (test header)  
Connector receptacle phone  
Inductor 150nH 20%  
Connector plug 2-pin (ac bias)  
Transistor PNP 2N4917  
Resistor 10K 1% 0.125W  
Resistor 4.64K 1%  
Resistor 10M 5% 0.25 W  
Resistor 46.4 Ω 1%  
Resistor 464 Ω 1% 0.125W  
Resistor 100 Ω 1% 0.125W  
Resistor 464 Ω 1% 0.125W  
Resistor 4.64K 1%  
Resistor 46.4 1%  
Resistor 1K 1% 0.125W  
Resistor 1M 1% 0.125W  
Resistor 4.64K 1%  
Resistor 464 Ω 1% 0.125W  
Resistor 4.64K 1%  
Resistor 100 Ω 5% 0.25W  
Resistor 4.64K 1%  
Resistor 100 Ω 1% 0.125W  
R130-133  
R134  
R135,136  
R137  
Backdating 151  
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Table A-1. A2 GPIB Parts List (continued)  
Ref Desig.  
Agilent Part No.  
Description  
ELECTRICAL PARTS  
TB101  
U101  
U106  
U108  
U109  
U110,111  
U112  
U113  
U114  
U115  
U116  
U117  
U118  
U119  
U120  
U121  
VR101  
VR102  
0360-2312  
1826-0468  
5080-2152  
1818-4111  
1820-6789  
1990-0444  
1820-3210  
1990-0543  
1821-1479  
lLH4-0001  
1820-2724  
1820-2549  
1820-4185  
5080-2153  
5080-2154  
1820-0430  
1902-0766  
1902-0959  
1902-0049  
1258-0209  
0410-2109  
Terminal block (digital control)  
IC MC3423PI  
IC DROM GPIB  
IC MCM 6164C55  
IC interface  
IC Opto isolator  
IC 68B50  
IC Opto isolator  
IC MPU  
IC GP-IB transceiver  
IC SN74ALS573BN  
IC 8291A  
IC interface  
IC GAL programmed GPIB  
IC GAL programmed IIPIB  
IC LM309K  
Diode zener 18.2V 5%  
Diode zener 11V 5%  
Diode zener 6.19V 5%  
Jumper  
VR103,104  
W101  
Y101  
Crystal oscillator 12.000MHz  
MECHANICAL PARTS  
--  
--  
--  
--  
--  
--  
--  
--  
1205-0758  
0340-1277  
0535-0031  
0515-0642  
0515-0911  
1200-0567  
1200-0639  
1200-1274  
Heatsink (U121)  
Insulator (Y101)  
Nut hex w/lockwasher (J101)  
Screw (U121)  
Screw M3x0.5 (J101)  
Socket IC 28-pin (U106)  
Socket IC 20-pin (U119,120)  
Socket IC (U114)  
152 Backdating  
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Figure A-1. A2 GPIB Component Parts List  
Backdating 153  
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Index  
A
A1 Front Panel Board, test header .............................................................................................................................. 57  
A2 GPIB Board, test header........................................................................................................................................ 57  
A3 FET Board  
dynamic troubleshooting...................................................................................................................................... 55  
static troubleshooting........................................................................................................................................... 55  
test connections.................................................................................................................................................... 55  
test points....................................................................................................................................................... 55, 56  
analog port .................................................................................................................................................................... 8  
Agilent 50504A oscilloscope...................................................................................................................................... 34  
Agilent 545A logic probe............................................................................................................................................ 34  
B
bias supply .................................................................................................................................................................. 36  
C
cable  
W3 ribbon............................................................................................................................................................ 79  
W4 phone............................................................................................................................................................. 79  
W5 phone............................................................................................................................................................. 79  
W6 ac bias............................................................................................................................................................ 79  
Cabling diagram........................................................................................................................................................ 146  
calibration constants, factory ...................................................................................................................................... 66  
calibration password ................................................................................................................................................... 65  
calibration, post-repair ................................................................................................................................................ 65  
calibration procedure .................................................................................................................................................... 7  
CC annunciator ........................................................................................................................................................... 55  
CC load effect, testing................................................................................................................................................. 26  
CC noise (PARD), testing........................................................................................................................................... 18  
CC PARD, defined...................................................................................................................................................... 18  
Circuits  
isolator board ....................................................................................................................................................... 84  
conductive table mat .............................................................................................................................................. 9  
conductive wrist strap ............................................................................................................................................ 9  
configuration jumper  
FACTORY PRESET CAL .................................................................................................................................. 59  
FLT/INH.............................................................................................................................................................. 59  
INHIBIT CAL...................................................................................................................................................... 59  
RELAY LINK...................................................................................................................................................... 59  
SA mode .............................................................................................................................................................. 59  
current, maximum programmable............................................................................................................................... 19  
current, --CC ............................................................................................................................................................... 19  
current programming and readback accuracy, testing................................................................................................. 19  
current sink and readback accuracy, testing................................................................................................................ 19  
CV/CC status annunciators ......................................................................................................................................... 54  
CV load effect, defined ............................................................................................................................................... 16  
CV load effect, testing ................................................................................................................................................ 16  
CV noise (PARD), defined ......................................................................................................................................... 17  
CV noise (PARD), testing........................................................................................................................................... 17  
Index 155  
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CV source effect, defined............................................................................................................................................ 17  
CV source effect, testing............................................................................................................................................. 17  
CV transient response waveform ................................................................................................................................ 18  
CV transient recovery time, defined ........................................................................................................................... 18  
CV transient recovery time, testing............................................................................................................................. 18  
CV voltage programming and readback accuracy, testing.......................................................................................... 16  
D
Diagram cabling........................................................................................................................................................ 146  
DIG CNTL port, configuring...................................................................................................................................... 58  
disassembly procedures............................................................................................................................................... 71  
downprogrammer FETs, location of ........................................................................................................................... 74  
E
electronic load....................................................................................................................................................... 12, 20  
error, checksum........................................................................................................................................................... 35  
error code  
E1......................................................................................................................................................................... 35  
E10....................................................................................................................................................................... 35  
E11....................................................................................................................................................................... 35  
E12....................................................................................................................................................................... 35  
E2......................................................................................................................................................................... 35  
E3......................................................................................................................................................................... 35  
E4......................................................................................................................................................................... 35  
E5......................................................................................................................................................................... 35  
E6......................................................................................................................................................................... 35  
E7......................................................................................................................................................................... 35  
E8......................................................................................................................................................................... 35  
E9......................................................................................................................................................................... 35  
error code, over GPIB................................................................................................................................................. 35  
error code, selftest....................................................................................................................................................... 35  
error message  
CAL DENIED...................................................................................................................................................... 67  
DACS................................................................................................................................................................... 35  
EE CHKSM ......................................................................................................................................................... 35  
EE WRITE ERR.................................................................................................................................................. 35  
FP RAM............................................................................................................................................................... 35  
FP ROM............................................................................................................................................................... 35  
FRAMING........................................................................................................................................................... 35  
GPIB .................................................................................................................................................................... 35  
PASSWD ERROR............................................................................................................................................... 67  
PRI IRAM............................................................................................................................................................ 35  
PRI ROM............................................................................................................................................................. 35  
PRI XRAM .......................................................................................................................................................... 35  
SBuF FULL ......................................................................................................................................................... 35  
SBuF OVERRUN................................................................................................................................................ 35  
SEC 5V................................................................................................................................................................ 35  
SECONDARY DWN........................................................................................................................................... 35  
SEC RAM............................................................................................................................................................ 35  
SEC ROM............................................................................................................................................................ 35  
SERIAL DOWN.................................................................................................................................................. 35  
SERIAL TIMOUT............................................................................................................................................... 35  
TEMP................................................................................................................................................................... 35  
UART OVERRUN .............................................................................................................................................. 35  
156 Index  
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UART PARITY................................................................................................................................................... 35  
error message, selftest................................................................................................................................................. 35  
errors  
calibration ............................................................................................................................................................ 35  
selftest.................................................................................................................................................................. 35  
ESD......................................................................................................................................................................... 9, 33  
F
factory calibration constants ....................................................................................................................................... 65  
firmware, revisions........................................................................................................................................................ 8  
firmware revisions....................................................................................................................................................... 64  
Form, performance test record.................................................................................................................................... 25  
front panel EEPROM  
factory cal location............................................................................................................................................... 67  
initialization of..................................................................................................................................................... 67  
transferring constants to....................................................................................................................................... 67  
front panel operation..................................................................................................................................................... 7  
front panel, testing....................................................................................................................................................... 34  
G
GPIB error 2................................................................................................................................................................ 66  
GPIB interface, testing................................................................................................................................................ 34  
I
*IDN query ................................................................................................................................................................. 58  
inhibit calibration jumper............................................................................................................................................ 66  
Isolator board circuits.................................................................................................................................................. 87  
J
jumper  
DIG I/O................................................................................................................................................................ 59  
FACTORY PRESET CAL .................................................................................................................................. 59  
INHIBIT CAL...................................................................................................................................................... 59  
NORM ................................................................................................................................................................. 59  
K
keypad......................................................................................................................................................................... 14  
L
line fuse, replacing........................................................................................................................................................ 9  
line voltage, conversion of............................................................................................................................................ 9  
M
manual backdating ........................................................................................................................................................ 8  
manual changes sheet.................................................................................................................................................... 8  
manufacturing date, determining .................................................................................................................................. 8  
message  
PWR ON INIT............................................................................................................................................... 35, 65  
Index 157  
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Mnemonics signal names.......................................................................................................................................... 140  
mutual coupling, test lead ........................................................................................................................................... 14  
N
noise, testing ............................................................................................................................................................... 14  
O
operating manual........................................................................................................................................................... 7  
oscilloscope, Agilent 54504A..................................................................................................................................... 15  
output heatsink assembly ............................................................................................................................................ 82  
output rectifiers  
location of............................................................................................................................................................ 75  
replacing .............................................................................................................................................................. 75  
overvoltage, maximum programmable ....................................................................................................................... 14  
P
Performance test record form...................................................................................................................................... 25  
performance tests, CC................................................................................................................................................. 19  
performance tests, CV................................................................................................................................................. 16  
power FETs, replacing................................................................................................................................................ 47  
power-on selftest......................................................................................................................................................... 34  
power-on selftest, disabling ........................................................................................................................................ 34  
protective earth ground ................................................................................................................................................. 9  
R
record sheet, test.......................................................................................................................................................... 13  
reference supply.......................................................................................................................................................... 34  
regulation, voltage....................................................................................................................................................... 14  
removing  
A1 Front Panel Assembly.................................................................................................................................... 74  
A1 Front Panel Board .......................................................................................................................................... 74  
A2 GPIB Board.................................................................................................................................................... 72  
A3 FET Board...................................................................................................................................................... 73  
A4 AC Input Board.............................................................................................................................................. 72  
A5 Control Board ................................................................................................................................................ 73  
A6 Output Filter Board........................................................................................................................................ 73  
A7 Snubber Board ............................................................................................................................................... 75  
ac input filter........................................................................................................................................................ 72  
fan ........................................................................................................................................................................ 73  
heatsink assembly ................................................................................................................................................ 73  
keypad.................................................................................................................................................................. 75  
L900 output choke ............................................................................................................................................... 75  
line switch............................................................................................................................................................ 72  
output subchassis ................................................................................................................................................. 75  
rear panel ............................................................................................................................................................. 72  
RFI shield............................................................................................................................................................. 72  
RPG controls........................................................................................................................................................ 73  
T900 output transformer ...................................................................................................................................... 72  
top cover .............................................................................................................................................................. 73  
Replaceable parts for A2 isolator board.................................................................................................................... 104  
resistor  
current monitoring ............................................................................................................................................... 12  
158 Index  
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load ...................................................................................................................................................................... 12  
resistor, current monitor.............................................................................................................................................. 12  
resistor, current monitoring......................................................................................................................................... 12  
S
SA ............................................................................................................................................................................... 58  
SA secondary interface, exiting test............................................................................................................................ 58  
SA signals  
A5 microprocessor............................................................................................................................................... 59  
SA signals, secondary interface .................................................................................................................................. 59  
SA signatures, identical............................................................................................................................................... 60  
SA signatures, similar ................................................................................................................................................. 60  
SA test header jumper................................................................................................................................................. 60  
Schematic notes ........................................................................................................................................................ 145  
SCPI programming ....................................................................................................................................................... 8  
secondary interface, testing......................................................................................................................................... 33  
sense terminals............................................................................................................................................................ 13  
serial number................................................................................................................................................................. 7  
serial number prefix ...................................................................................................................................................... 7  
settling time................................................................................................................................................................. 13  
Signal name  
mnemonics......................................................................................................................................................... 140  
Signals  
+5V bias voltage................................................................................................................................................ 140  
BSTx.................................................................................................................................................................. 140  
PCLR ................................................................................................................................................................. 140  
RESET*............................................................................................................................................................. 140  
RxD.................................................................................................................................................................... 140  
SPCLR*............................................................................................................................................................. 140  
SRx .................................................................................................................................................................... 140  
TxD.................................................................................................................................................................... 140  
XFMR Tl ........................................................................................................................................................... 140  
slew rate ...................................................................................................................................................................... 13  
T
test  
selftest.................................................................................................................................................................. 11  
test equipment, troubleshooting .................................................................................................................................. 33  
test headers.................................................................................................................................................................. 35  
test leads...................................................................................................................................................................... 13  
test measurements, cc mode........................................................................................................................................ 19  
test points, troubleshooting ......................................................................................................................................... 35  
Test point waveforms................................................................................................................................................ 144  
tests  
constant-current mode.......................................................................................................................................... 19  
constant-voltage mode ......................................................................................................................................... 14  
independent order of............................................................................................................................................ 14  
operation verification........................................................................................................................................... 14  
performance ......................................................................................................................................................... 14  
programming........................................................................................................................................................ 13  
performance test record ....................................................................................................................................... 25  
TORX screws.............................................................................................................................................................. 71  
transformer, variable-voltage ...................................................................................................................................... 18  
transient recovery time................................................................................................................................................ 18  
Index 159  
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Troubleshooting  
test points........................................................................................................................................................... 142  
troubleshooting chart  
output held high ................................................................................................................................................... 36  
OV at turn-on....................................................................................................................................................... 36  
secondary downprogramming.............................................................................................................................. 36  
troubleshooting charts................................................................................................................................................. 36  
*TST? .................................................................................................................................................................. 34  
*TST? Query........................................................................................................................................................ 34  
U
UNREGULATED annunciator................................................................................................................................... 55  
using *IDN query.......................................................................................................................................................... 8  
V
voltage, maximum programmable .............................................................................................................................. 13  
160 Index  
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