Samsung Printer ML 1700 User Guide
LASER PRINTER  
ML-1700 Series  
ML-1710  
ML-1750  
Manual  
SERVICE  
LASER PRINTER  
CONTENTS  
1. Precautions  
2. Reference Information  
3. Specifications  
4. Summary of product  
5. Disassembly and Reassembly  
6. Alignment and Adjustments  
7. Troubleshooting  
8. Exploded Views and Parts List  
9. Block Diagram  
10. Connection Diagram  
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Precautions  
1. Precautions  
The cautions in the below are items needed to keep in mind when maintaining and servicing.  
Please read carefully and keep the contents in mind to prevent accidents while servicing and to prevent  
1
that the machine gets damage.  
1.1 Warning for safety.  
(1) Request the service by qualified service person.  
The service for this machine must be performed by a service person who took the additional education of  
this field.  
It is dangerous if unqualified service person or user tries to fix the machine.  
(2) Do not rebuild it discretionary.  
Do not attach or change pats discretionary. Do not dissemble, fix, and rebuilt it. If do, printer will abnormally  
work and electric shock or a fire can be occurred.  
(3) Laser Safety Statement  
The Printer is certified in the U.S. to conform to the requirements of DHHS 21 CFR, chapter 1 Subchapter J  
for Class 1(1) laser products, and elsewhere, is certified as a Class I laser product conforming to the  
requirements of IEC 825.  
Class I laser products are not considered to be hazardous. The laser system and printer are designed so  
there is never any human access to laser radiation above a Class I level during normal operation, user  
maintenance, or prescribed service condition.  
Warning >> Never operate or service the printer with the protective cover removed from Laser/Scanner assembly. The reflected  
beam, although invisible, can damage your eyes. When using this product, these basic safety precautions should  
always be followed to reduce risk of fire, electric shock, and injury to persons.  
CAUTION - INVISIBLE LASER RADIATION  
WHEN THIS COVER OPEN.  
DO NOT OPEN THIS COVER.  
VORSICHT - UNSICHTBARE LASERSTRAHLUNG,  
WENN ABDECKUNG GE FFNET.  
NICHT DEM STRAHL AUSSETZEN.  
ATTENTION - RAYONNEMENT LASER INVISIBLE EN CAS  
D OUVERTURE. EXPOSITION DANGEREUSE  
AU FAISCEAU.  
ATTENZIONE - RADIAZIONE LASER INVISIBILE IN CASO DI  
APERTURA. EVITARE L ESPOSIZIONE AL  
FASCIO.  
PRECAUCION - RADIACION LASER IVISIBLE CUANDO SE ABRE.  
EVITAR EXPONERSE AL RAYO.  
ADVARSEL. - USYNLIG LASERSTR LNING VED BNING, N R  
SIKKERHEDSBRYDERE ER UDE AF FUNKTION.  
UNDG UDSAETTELSE FOR STR LNING.  
ADVARSEL. - USYNLIG LASERSTR LNING N R DEKSEL  
PNES. STIRR IKKE INN I STR LEN.  
UNNG EKSPONERING FOR STR LEN.  
VARNING - OSYNLIG LASERSTR LNING N R DENNA DEL  
R PPNAD OCH SP RREN R URKOPPLAD.  
BETRAKTA EJ STR LEN. STR LEN R FARLIG.  
VARO! - AVATTAESSA JA SUOJALUKITUS OHITETTAESSA  
OLET ALTTIINA N KYM TT M LLE LASER-  
S TEILYLLE L KATSO S TEESEEN.  
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Precautions  
1.2 Caution for safety  
1.2.1 Precaution related noxious material  
The toner in a printer cartridge contains a chemical material, which might harm human body if it is swallowed.  
Please keep children out of the toner cartridge.  
1.2.2 Precaution related electric shock or fire  
It is possible to get electric shock or burn by fire if you don't fallow the instructions of the manual.  
(1) Use exact voltage. Please do use an exact voltage and wall socket. If not, a fire or an electric leakage can  
be caused.  
(2) Use authorized power code. Do use the power code supplied with PRINTER. A fire can be occurred when  
over current flows in the power code.  
(3) Do not insert many codes in an outlet. If do, a fire can be occurred due to flow over current in an outlet.  
(4) Do not put water or extraneous matter in the PRINTER. Please do not put water, other liquid, pin, clip, etc.  
It can cause a fire, electric shock, or malfunction. If it is happened, turn off the power and remove the  
power plug from outlet immediately.  
(5) Do not touch the power plug with wet hand. When servicing, do remove the power plug from outlet. And  
do not insert or take off it with wet hand. Electric shock can be occurred.  
(6) Caution when inserting or taking off the power plug. The power plug has to be inserted completely. If not,  
a fire can be caused due to poor contact. When taking off the power plug, do grip the plug and take it off.  
If grip the line and pull over, it could be damaged. A fire or electric shock could cause.  
(7) Management of power code. Do not bend, twist, or bind it and place other materials on it. Also, do not fix  
it with staples. If the power code gets damage, a fire or electric shock can be caused. A damaged power  
code must be replaced immediately. Do not repair the damaged part and reuse it. A repaired part with plas-  
tic tape can be occurred a fire or electric shock. Do not spread chemicals on the power code. Do not  
spread insecticide on the power code. A fire or electric shock can be occurred due to thinner(weak) cover  
of the power code.  
(8) Check whether the power outlet and the power plug are damaged, pressed, chopped, or blazing fire or  
not. When such inferiorities are found, repair it immediately. Do not make it pressed or chopped when  
moving the machine.  
(9) Caution when thundering, and being flash of lightening. It causes a fire or electric shock. Take the power  
plug off when thundering. Do not touch cable and device when thundering and being flash of lightening.  
(10) Do avoid the place where is moisture or has dust. Do not install the printer in where have lots of dust or  
around humidifier. A fire can be occurred. A plug part need to clean well with dried fabric to remove dust.  
If water drops are dripped on the place covered with dust, a fire can be occurred.  
(11) Avoid direct sunlight. Do not install the printer near to window where directly contacts to the sunlight. If  
the machine contacts sunlight long time, the machine cannot work properly because inner temperature  
of the machine is getting higher. A fire can be caused.  
(12) Turn off the power and take off the plug when a smoke, strange smell, or sound from the machine. If you  
keep using it, a fire can be occurred.  
(13) Do not insert steel or metal piece inside/outside of the machine. Do not put steel or metal piece into a  
ventilator. An electric shock could be happened.  
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Precautions  
1.2.3 Precaution related handling the machine.  
If you ignore this information, you could get harm and machine could be damaged.  
(1) Do not install it on the different levels, or slanted floor.  
Please confirm whether it is balanced or not after installation. If it is unbalanced, an accident can be hap-  
pened due to the machine fell over.  
(2) Be careful not to insert a finger or hair in the rotating unit.  
Be careful not to insert a finger of hair in the rotating unit (motor, fan, paper feeding part, etc) while the  
machine is operating. Once it happens, you could harm.  
(3) Do not place a pot contains water/chemical or small metals. If those are got into the inner side of machine,  
a fire or electric shock can be occurred.  
(4) Do not install it in where lots of moisture or dust exists or where raindrop reaches. A fire or electric shock  
can be caused.  
(5) Do not place a candlelight, burning cigarette, and etc. on the machine. Do not install it near to heater. A  
fire can be occurred.  
1.2.4 Precaution when assembly/disassembly  
When replace parts, do it very carefully. Do memorize the location of each cable before replace parts for  
reconnecting it afterwards. Do memorize. Please perform the below before replace or disassembly the parts.  
(1) Check the contents stored in the memory. All the information will be erased after replace main board. The  
information needed to keep has to be written down.  
(2) Before servicing or replacing electric parts, take off a plug.  
(3) Take off printer cables and power code connected to printer.  
(4) Do use formal parts and same standardized goods when replacing parts.Must check the product name,  
part code, rated voltage, rated current, operating temperature, etc.  
(5) Do not give an over-force when release or tighten up the plastic parts.  
(6) Be careful not to drop the small parts such as screws in the printer.  
(7) Be careful not to change the location of small parts such as screws when assembling and disassembling.  
(8) Do remove dust or foreign matters completely to prevent fire of tracking, short, or etc.  
(9) After finished repair, check the assembling state whether it is same as before the repair or not.  
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Precautions  
1.3 ESD Precautions  
Certain semiconductor devices can be easily damaged by static electricity. Such components are commonly  
called “Electrostatically Sensitive (ES) Devices”, or ESDs. Examples of typical ESDs are: integrated circuits,  
some field effect transistors, and semiconductor “chip” components.  
The techniques outlined below should be followed to help reduce the incidence of component damage caused  
by static electricity.  
Caution >>Be sure no power is applied to the chassis or circuit, and observe all other safety precautions.  
1. Immediately before handling a semiconductor component or semiconductor-equipped assembly, drain off  
any electrostatic charge on your body by touching a known earth ground. Alternatively, employ a commer-  
cially available wrist strap device, which should be removed for your personal safety reasons prior to apply-  
ing power to the unit under test.  
2. After removing an electrical assembly equipped with ESDs, place the assembly on a conductive surface,  
such as aluminum or copper foil, or conductive foam, to prevent electrostatic charge buildup in the vicinity  
of the assembly.  
3. Use only a grounded tip soldering iron to solder or desolder ESDs.  
4. Use only an “anti-static” solder removal device. Some solder removal devices not classified as “anti-static”  
can generate electrical charges sufficient to damage ESDs.  
5. Do not use Freon-propelled chemicals. When sprayed, these can generate electrical charges sufficient to  
damage ESDs.  
6. Do not remove a replacement ESD from its protective packaging until immediately before installing it. Most  
replacement ESDs are packaged with all leads shorted together by conductive foam, aluminum foil, or a  
comparable conductive material.  
7. Immediately before removing the protective shorting material from the leads of a replacement ESD, touch  
the protective material to the chassis or circuit assembly into which the device will be installed.  
8. Maintain continuous electrical contact between the ESD and the assembly into which it will be installed,  
until completely plugged or soldered into the circuit.  
9. Minimize bodily motions when handling unpackaged replacement ESDs. Normal motions, such as the  
brushing together of clothing fabric and lifting one’s foot from a carpeted floor, can generate static electric-  
ity sufficient to damage an ESD.  
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REFERENCE INFORMATION  
2. Reference Information  
This chapter describes the reference information for applying this training manual, and it is consist-  
ed of the tool list, the abbreviation table, the outline of model, and so on.  
2
2.1 Tool for Troubleshooting  
The following tools are recommended for safe and smooth troubleshooting described in this service manual.  
DCU(Diagnostic Control Unit)  
Standard : Test equipment to diagnose the Laser  
printer supplied by Samsung Electronics.  
Driver  
1
4
Standard : "-" type, "+" type (M3 long, M3 short, M2 long,  
M2 short).  
Tweezers  
5
6
Standard : For general home use, small type.  
DVM(Digital Volt Meter)  
Standard : Indicates more than 3 digits.  
Cotton Swab  
Standard : For general home use, for medical ser-vice  
2
Cleaning Equipments a IPA(Isopropyl  
Alcohol)dry cloth or a soft stuff neutral  
detergent  
7
8
Software(Driver) installation CD ROM  
Electronic Scale  
3
Standard : Equipment to check the weight of con-  
sumables(toner cartridge) supplied by Samsung  
Electronics. (The gram unit can be measured.)  
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REFERENCE INFORMATION  
2.2 Acronyms and Abbreviations  
The table in the below explains abbreviations used in this service manual.  
The contents of this service manual are declared with abbreviations in many parts. Please refer to the  
table.  
AC  
Alternating Current  
IEEE  
Institute of Electrical and Electronics  
Engineers. Inc  
ASIC  
ASSY  
BIOS  
CMOS  
Application Specific Integrated Circuit  
assembly  
IPA  
Isopropy Alcohol  
IPM  
LAN  
lb  
Images Per Minute  
local area network  
pound(s)  
Basic Input Output System  
Complementary Metal Oxide  
Semiconductor  
CN  
connector  
LBP  
LCD  
LED  
LSU  
MB  
Laser Beam Printer  
Liquid Crystal Display  
Light Emitting Diode  
Laser Scanning Unit  
megabyte  
CON  
CPU  
dB  
connector  
Central Processing Unit  
decibel  
dbA  
decibelampere  
dBM  
DC  
decibel milliwatt  
MHz  
NVRAM  
OPC  
PBA  
PCL  
megahertz  
direct current  
nonvolatile random access memory  
Organic Photo Conductor  
Printed Board Assembly  
DCU  
DPI  
Diagnostic Control Unit  
Dot Per Inch  
DRAM  
DVM  
ECP  
EEPROM  
Dynamic Random Access Memory  
Digital Voltmeter  
Enhanced Capability Port  
Printer Command Language , Printer  
Control Language  
PDL  
Page Discription Language  
Page Per Minute  
PPM  
PTL  
Electronically Erasable Programmable  
Read Only Memory  
Pre-Transfer Lamp  
EMI  
EP  
Electro Magnetic Interference  
electrophotographic  
Enhanced Parallel Port  
firmware  
Q-PID  
Q ty  
Quick Printer Initiating Device  
quantity  
EPP  
F/W  
GDI  
GND  
HBP  
HDD  
HV  
RAM  
ROM  
SCF  
SMPS  
SPGP  
SPL  
Random Access Memory  
Read Only Memory  
graphics device interface  
ground  
Second Cassette Feeder  
Switching Mode Power Supply  
Samsung Printer Graphic Processor  
Samsung Printer Language  
Simultaneous Peripheral Operation Online  
switch  
Host Based Printing  
Hard Disk Drive  
high voltage  
Spool  
SW  
HVPS  
I/F  
High Voltage Power Supply  
interface  
sync  
USB  
synchronous or synchronization  
Universal Serial Bus  
I/O  
Input and Output  
integrated circuit  
IC  
IDE  
Intelligent Drive electronics or Imbedded  
Drive Electronics  
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REFERENCE INFORMATION  
2.3 The Sample Pattern for the Test  
The sample pattern shown in below is the standard pattern used in a factory.  
The contents of the life span and the printing speed are measured with the pattern shown in below.  
(The picture in the manual is 70% size of the actual A4 size.)  
2.3.1 A4 5% Pattern  
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2.3.2 A4 2% Pattern  
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2.3.3 A4 IDC Pattern  
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Specifications  
3. Specifications  
Product specifications are subject to change without notice.See below for product specifications.  
3.1 General Specifications  
3
ITEM  
DESCRIPTION  
Non-impact Electro-photograpic Printing  
Print Technology  
Developing system  
Print Speed(1)  
Non-Magnetic, Mono-Component Developing System  
16 PPM : A4 size , 5% Character pattern  
17 PPM : Letter size , 5% Character pattern  
ML-1710 : True 600 X 600 DPI  
ML-1750 : 1200 X 600 DPI  
Resolution  
Source of Light  
Warm-Up Time  
First Print Out Time  
Media Size  
Laser diode (LSU : Laser Scanner Unit)  
Power-on boot : 30 seconds or less  
Less than 12 seconds (Ready to 1st page out)  
75 X 125 (3” X 5”) mm to 216 X 356 (8.5” X 14”)mm  
16 ~ 24 lb  
Media Thickness  
Dimension(W X D X H)  
Weight  
352 (13.8”) X 372 (14.6”) X 196 (7.7”) mm  
Net : 7 Kg /15.4 lb  
Gross : 9.5 Kg (Max.)  
Acoustic Noise(1)  
Stand by : Less than 35 dB  
Printing : Less than 50 dB  
Power save mode  
Toner save mode  
Duty Cycle  
Available  
Available  
Monthly : 15,000 pages maximum  
Periodic Replacing Parts(2) Pick Up Roller : 60,000 Sheets  
Feed Roller 60,000 Sheets  
:
Transfer Roller : 60,000 Sheets  
Fuser Assembly : 60,000 Sheets  
(1) For measuring the printing speed, count the papers which outputted within one minute from when the  
second page starts to be printed. (A4, 5% character pattern standard)  
(2) The life span of the consumption parts can be checked by printing the demo page or the system list.  
(Refer to the 6.3 Receive the service information)  
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Specifications  
3.2 Controller Specification  
DESCRIPTION  
ITEM  
ML-1710  
ML-1750  
Processor(CPU)  
OS Compatibility(1)  
Samsung Jupiter4 90MHz  
Win 98x/ME/2000/XP,  
Samsung SPGPm 166MHz  
Win 9x/NT4.0/ME/2000/XP  
Various Linux OS,Mac (Mac OS 8.6 ↑)  
FLASH ROM(PROGRAM) : 0.5MB flash  
RAM : 8 MB  
Various Linux OS,Mac (Mac OS 8.6 ↑)  
Memory  
EEPROM(NVRAM) : 512 byte  
SPL(Samsung Printer Language)  
USB 1.1  
Emulation  
Interface  
PCL6, IBMProPrinter, EPSON  
USB  
- 12 Mbps 1 port  
- USB 2.0  
- 480 Mbps 1 port  
Parallel : IEEE 1284  
- Modes supported :  
Compatible,Nibble,Byte,ECP  
External Network Adaptor(Optional)  
Interface switching  
Interface time-out  
Font  
Automatic  
5min(Max.)  
Windows Font  
45 Scalable, 1 Bitmap  
(1) The SPL series model is USB exclusive use, so it supports the environment beyond the WIN 98.  
3.3 Electrical Specification  
ITEM  
DESCRIPTION  
100~127VAC  
Input Voltage  
Nominal input voltage  
Input voltage range  
Nominal frequency  
90~132VAC  
50/60 Hz  
Frequency tolerance  
+3Hz  
Power Consumption  
Printing : 280W Avg or less  
Power Save : 10W Avg or less  
3-4 Environmental Range  
ITEM  
OPERATING  
STORAGE  
Temperature  
10~32 oC(50-90 oF)  
-20~40 oC (-4~104 oF)  
Humidity  
20~80%RH  
10~80%RH  
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Specifications  
3.5 TONER Cartridge (Developer)  
ITEM  
Life span  
DESCRIPTION  
REMARK  
IDC 5% pattern  
Starter: 1,000 sheets  
Running : 3,000 sheets  
Non-magnetic Mono Conponent Contact Developing  
Conductive Roller Charging  
Not Available  
Developing  
Charging  
Toner checking sensor  
Ozone  
0.1PPM or less  
8 hours  
Style  
Single cartridge  
2-Paper Handling Specifications  
Please refer to "Paper Specifications" on user guide  
• Input Paper Size  
PAPER  
DIMENSIONS  
210 X 297 mm  
WEIGHT  
60 to 90 g/m2 bond(16 to 24 lb)  
A4  
Letter  
216 X 279(8.5 X 11")  
216 X 356(8.5 X14")  
Legal(Legal14")  
JIS B5  
182 X257mm (7.2 X 10")  
216 X 330mm (8.5 X 13")  
Folio(Legal13")  
Minimum size (Custom)  
Maximum size (Custom)  
Transparency(OHP)  
Label paper  
76 X 127mm (3 X 5")  
60 to 163 g/m2 bond(16 to 43 lb)  
216 X 356mm (8.5 X 14")  
Same minimum and maximum  
sizes as listed above  
Thickness:  
0.10 X 0.14 mm (0.0039 X 0.0055")  
Envelopes  
Up to 90 g/m2 bond(16 to 24 lb)  
• Input capacity  
Cassette: 250 sheets  
Manual : 1 sheet  
• Output capacity  
Face Down : 50 sheets(20lb)  
Face Up : 1 sheet(OHP, Lavbel, Cut Sheet, Envelope)  
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Specifications  
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SUMMARY OF PRODUCT  
4. Summary of Product  
This chapter describes the functions and operating principal of the main component.  
4
4.1 Printer Components  
4.1.1 Front View  
Top output tray  
(Face down)  
Control Panel  
Output Support  
Front Cover  
Power switch  
Manual Feeder guide  
Manual Feeder  
Paper level indicator  
Tray  
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SUMMARY OF PRODUCT  
4.1.2 Rear View  
Rear output tray  
(Face up)  
Power receptacle  
Parallel port  
(ML-1750 Only)  
USB port  
4.1.3 Inside View  
Toner cartridge  
Front Cover  
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SUMMARY OF PRODUCT  
4.1.3 Control Panel  
1) On Line/Error and Toner Save LEDs  
LED  
Description  
If the On Line/Error lights green, the printer is ready to print.  
If the On Line/Error lights red, the printer is experiencing an error, such as jammed paper,  
the open cover or the empty toner cartridge. If you press the Cancel button while the printer  
is receiving data, the On Line/Error LED blinks red to cancel printing.  
In Manual Feed mode, if there is no paper in the Manual Feeder, the On Line/Error LED  
blinks red. Load paper into the Manual Feeder and the LED stops blinking.  
If the printer is receiving data, the On Line/Error LED slowly blinks green.  
If the printer is printing the received data, the On Line/Error LED blinks green fast.  
If you press the Cancel button in Ready mode, this LED is on and the Toner Save mode is  
enabled.  
If you press this button once again, this LED is off and the Toner Save mode is disabled.  
If the On Line/Error and Toner Save LEDs blink, your system has some problems. To solve  
the problem.  
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SUMMARY OF PRODUCT  
2) Cancel button  
Printing demo page  
In Ready mode, press and hold this button for about 2 seconds until  
all LEDs blink slowly, and release.  
Printing configuration sheet  
Manual feeding  
In Ready mode, press and hold this button for about 6 seconds until  
all LEDs blink fast, and release.  
Press this button each time you load a sheet of paper in the manual  
feeder, when you select Manual Feed for Source from your software  
application.  
Cleaning inside printer  
Canceling print job  
In Ready mode, press and hold this button for about 10 seconds  
until all LEDs turn on, and release. After cleaning the printer, one  
cleaning sheet prints.  
Press this button during printing. The On Line/Error LED blinks while  
the print job is cleared from both the printer and the computer, and  
then return to Ready mode. This may take some time depending on  
the size of the print job.  
In Manual Feed mode, you can’t cancel the print job by pressing this  
button.  
Toner Save mode on/off  
In Ready mode, press this button to turn the Toner Save mode on or  
off.  
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SUMMARY OF PRODUCT  
4.2 System Layout  
6
L S U  
CR  
5
Fuser  
Toner Cartridge  
DR  
OPC  
SR  
7
PR  
2
MP Sensor  
TR  
FR  
4
3
1
1
2
3
4
5
6
7
Cassette  
Fuser  
Manual Feeder  
Transfer Roller  
PTL(Per-Tramsfer-Lamp)  
LSU(Laser Scan Unit)  
Toner Cartridge  
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SUMMARY OF PRODUCT  
4.2.1 Feeding Part  
There are the universal cassette, which loads papers, and the manual feeder, which supplies paper one by  
one. The cassette has the function pad which separates paper one by one, and it has the sensor function  
to check the existence of the loading paper.  
- Feeding Method: Universal Cassette Type  
- Feeding Standard: Center Loading  
- Feeding Capacity: Cassette-250 sheets (75g/m©˜, 20lb paper standard)  
Manual 1 sheet (Paper, OHP, Envelop, etc.)  
- Paper detecting sensor: Photo sensor  
- Paper size sensor: None  
4.2.2 Transfer Ass’y  
It is consisted of the PTL (pre-transfer lamp) and the Transfer Roller. The PTL sends a light to the OPC  
drum, makes the current on the drum surface to low, and improves the transfer efficiency.  
The transfer roller delivers the toner of the OPC drum to the paper.  
- The life span: Print over 60,000 sheets (in 15~30°C)  
4.2.3 Driver Ass’y  
It is a power delivery unit by gearing. By driving the motor, it supplies the power to the feeding unit, the  
fusing unit, and the distributing unit.  
4.2.4 Fixing Part(Fuser)  
- The fuser is consisted of the Heat Lamp, Heat Roller, Pressure Roller, Thermistor, and Thermostat. It  
adheres the toner to the paper with a pressure and a heat to complete the printing job.  
- There are two methods, the existing method which use the Heat Lamp and the Q-PID which is developed  
by Samsung.  
110V : Heat Lamp type Fuser  
220V : Heat Lamp type or Q-PID type Fuser  
4.2.4.1 Temperature-Intercepting Device (Thermostat)  
The thermostat is the temperature-intercepting device, which cuts off the power for preventing an overheat-  
ing or a fire when the heat lamp or the heat coil of the heat roller is overheated.  
4.2.4.2 Temperature Detecting Sensor (Thermistor)  
The Thermistor detects the surface temperature of the heat roller, and it maintains the regular temperature  
of the heat roller by responding to the information of the temperature.  
4.2.4.3 Heat Roller  
The heat roller transfers the temperature from the heat lamp or heat coil to the surface to heat the paper  
which passes the surface. The melted toner cannot stain the heat roller coated with Teflon.  
The heating elements are heat lamp and heat coil. For this product, Q-PID method with the heat coil is  
applied.  
4.2.4.4 Pressure roller  
The pressure roller mounted right under the heat roller is made of the silicon resin, and the surface of the  
roller is coated with Teflon to fuse the toner on the paper when paper passes between the heat roller and  
the pressure roller.  
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4.2.4.5 Safety Relevant Facts  
• Protecting device when overheating  
- 1st protecting device: H/W cuts off when detecting an overheating  
- 2nd protecting device: S/W cuts off when detecting an overheating  
- 3rd protecting device: Thermostat cuts off the power  
• Safety device  
- The power of the fuser is cut off when the front cover is open.  
- The overheating safety device for customer  
- Maintains the surface temperature of the Fuser Cover under 80°C and attach the caution label  
inside of the rear cover where customer can find easily.  
4.2.5 LSU (Laser Scanner Unit)  
The LSU unit is controlled by the video controller. It scans the video data received from video controller with  
laser beam by using the rotation principal of the polygon mirror to create the latent image on the OPC drum.  
It is the core part of LBP.  
The OPC drum rotates as the same speed as the paper feeding speed. It creates the /HS YNC signal and  
sends it to the engine when the laser bean of the LSU reaches the end of the polygon mirror, and the engine  
detects the /HS YNC signal to arrange the vertical line of the image on the paper. After detecting the /HS  
YNC signal, the image data is sent to the LSU to arrange the its left margin on the paper.  
The one side of the polygon mirror is one line for scanning.  
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4.2.6 Toner Cartridge  
By using the electronic photo process, it creates a visual image. In the toner cartridge, the OPC unit and  
the developer unit are in a body. The OPC unit has OPC drum and charging roller, and the developer unit  
has toner, toner cartridge, supply roller, developing roller, and blade (Doctor blade)  
- Developing Method: Non magnetic 1 element contacting method  
- Toner: Non magnetic 1 element shatter type toner  
- The life span of toner: 3,000 sheets (IDC Pattern/A4 standard)  
- Toner remaining amount detecting sensor: None  
- OPC Cleaning: Collect the toner by using electric static + FILM OPC  
- Management of disusable toner: Collect the toner by using electric static (Clenerless Type- No  
disusable toner)  
- OPC Drum protecting Shutter: None  
- Classifying device for toner cartridge: ID is classified by interruption of the frame channel.  
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4.3 Main PBA(SPL Model)  
The Engine Board and the Controller Board are in one united board, and it is consisted of CPU part and  
print part in functional aspect. The CPU is functioned as the bus control, I/O handling, drivers, and PC inter-  
face. The main board sends the Current Image dlml Video data to the LSU and manages the conduct of  
Electrophotography for printing. It is consisted of the circuits of the motor (paper feed, pass)  
driving, clutch driving, pre-transfer lamp driving, current driving, and fan driving.  
The signals from the paper feed jam sensor and paper empty sensor are directly inputted to the main  
board.  
FLASH MEMORY  
ASIC  
SDRAM  
BUFFER  
VIDEO CLK  
14.7456MHz  
Main CLK  
10MHz  
USB PORT  
MOTOR Drive IC  
U27 U16 U26 U32  
U24 CN3  
CN9  
OSC1  
U33  
CN10  
U13  
CN6  
U17  
OSC2  
CN2  
CN1  
U20 U31 CN5 U25  
CN8  
CN7  
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4.3.1 ASIC (Jupiter IV)  
The Jupiter IV (16Bit RISC Processor), which is the executive controller to operate the printer function, is in  
use, and the each operation block is driven by system program of the flash memory. The whole system is  
controlled by driving operation block.  
•Main function block  
• Completely Integrated System for Embedded Applications,  
• 16 Bit Risc Architecture, Efficient and Powerful ARM7TDMI CPU  
• LSU Interface Module for Interfacing PVC or HPVC with LSU  
• 2 Channel General Purpose DMA Controller for High Speed I/O  
• Dual Memory Bus Architecture  
• Operating frequency : 80MHz  
• Operating power : 3.3V  
• Power on reset time : under 6.6ms  
4.3.2 Flash Memory  
It stores the system program and downloads the system program through the PC interface.  
• Capacity : 0.5M Byte  
• Access Time : 70 nsec  
4.3.3 SDRAM  
It is used as a swath buffer, system working memory area, etc. while printing.  
• Capacity :  
ML-1510  
2 M byte  
ML-1710  
8 M byte  
ML-1750  
8 M byte  
•
Access Time : 60 nsec  
4.3.4 Sensor input circuit  
1) Paper Empty Sensing  
The Paper empty sensor (Photo Interrupter) on the engine board informs the state of paper to CPU whether  
it is empty or not with operation of the actuator.  
When cassette is empty, it detects the fact by reading the D0 Bit of CPU, and then informs the fact by  
selecting the second LED(yellow) among the panel LEDs.  
2) MP Sensing  
By operation of Actuator on the frame, the MP Sensor (Photo Interrupter) on the engine board informs the  
state of paper to CPU whether it is empty or not. It reads the D0 Bit of CPU for recognizing paper in MP,  
and paper is fed from MP if there is.  
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3) Paper Feeding, Toner Cartridge Sensing  
When paper passes the actuator (feed sensor part), it detects the signal of Photo interrupter, informs the  
paper feeding state to CPU, and then sprays the image data after certain time.  
If it doesn't detect the feed sensor within 1 sec. after paper is fed, paper Jam0 is occurred (Red and Yellow  
will be turned on among the OP panel LEDs), and the fact whether the developer is inserted or not is detect-  
ed with the same principle. After the developer is mounted, the actuator is operated. The signal from the photo  
interrupter is detected when it is passing the actuator of the sensor part. That is the developer ID sensing.  
4) Paper Exit Sensing  
It detects paper state whether paper gets out from the set with operation of exit sensor on the engine board  
and actuator on the frame. Paper detects the on/off time of exit sensor, and the normal operation or jam infor-  
mation is informed to the CPU.  
The paper JAM2 is informed. (Red, Yellow LED will be turned on among the OP panel LEDs)  
5) Cover Open Sensing  
The Cover open sensor is located on the front cover. After the front cover is opened, +24V (DC fan, solenoid,  
main motor, polygon motor part of LSU, HVPS), which is supplied to the each unit, is cut off.  
The cover-open sensing is operated by the D0 bit of CPU, and the developer ID sensing is operated.  
In this case, the red LED among OP panel LEDs will be ON for informing the facts to user.  
6) DC FAN / SOLENOID Driving  
It is driven by transistor and controlled by D6 bit of CPU.  
When it is high, the fan is driving by turning on the TR, and it is off when the sleep mode is selected.  
There are two solenoids, and they are driven by paper pick-up and MP signal. Its driving time is 300ms. The  
diode protects the driving TR from the noise pulse, which is flown when the solenoid is de-energizing.  
7) Motor Driving  
The motor driving circuit is formed when the Driver IC is selected in the first place. The A3977 (Motor driver  
IC) is used in this case. But, the resistance Rs value of sensing and the voltage value of the V reference can  
be changed by motor driving voltage value.  
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SUMMARY OF PRODUCT  
4.4 Main PBA (PCL Model)  
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U8  
U6 CN2 U27  
CN3  
U7 CN4  
U3  
U20 U10 U11  
U24 U13 CN13  
OSC2  
U13  
CN6  
CN12  
U1 U15 U25  
U14 OSC5 CN8 OSC4 U17  
U26 U18  
CN10  
CN9 CN11  
ML-1710 (ML-1510)  
ML-1750  
Processor  
Samsung Jupiter4 90MHz  
Samsung SPGPm 166MHz  
USB 2.0  
PC Interface  
USB 1.1  
USB  
USB/IEEE1284 (Parallel)  
SPL, PCL6,  
Emulation  
SPL  
(Samsung Printer Language)  
Win 98/Me/2000/XP  
Various Linux OS,  
IBM ProPrinter, EPSON  
Win 9x/NT/4.0/Me/2000/XP  
Various Linux OS,  
Mac (Mac OS 8.6 ↑)  
FR-4, 4Layer  
OS Compatibility  
pcb  
Mac (Mac OS 8.6 ↑)  
FR-4, 2Layer  
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4.4.1 Asic(SPGPm)  
1) ARM946ES  
- 32-bit RISC embedded processor core  
- 16KB instruction cache and 16KB data cache  
- No Tightly Coupled Memory  
- Memory Protection Unit & CP15 control program  
2) Dual bus architecture for bus traffic distribution  
- AMBA High performance Bus (AHB)  
- System Bus with SDRAM  
3) IEEE1284 compliant parallel port interface  
4) Printer Video Controller for LBP engines  
5) Graphic Execution Unit for Banding support of Printer Languages  
6) Printer Video Controller for LBP engines  
- PVC : Printer Video Controller without RET Algorithm  
- HPVC : Printer Video Controller with RET algorithm  
(Line Memory & Lookup Table Memory : 512 x 8 , 4096 x 16)  
7) Engine Controller  
- Motor Control Unit  
- Motor Speed Lookup Table Memory (128 x 16 x 2)  
- Pulse Width Modulation Unit  
- 4 Channels are supported  
- ADC Interface Unit  
- 3 ADC Channels are available  
- ADC Core (ADC8MUX8) maximum clock frequency : 3 MHz  
8) USB 2.0 Interface  
9) Package : 272 pins PBGA  
10) Power : 1.8V(Core), 3.3V(IO) power operation  
11) Speed : 166MHz core(ARM946ES) operation, 60MHz bus operation  
4.4.2 Memory  
1) Flash Memory  
- It stores the System Program, downloads the System program through PC Interface, and compresses the  
PCL font, then stores it.  
- Capacity : 2M Byte  
- Access Time : 70 nsec  
2) DRAM  
- It is used as Swath buffer, System working memory area, etc. when printing. It stores the font list, com-  
pressed into flash memory, on DRAM and uses it as PCL font.  
- Capacity : 8M Byte (Basic), upto 64M Byte (Factory Option)  
- Type : SDRAM 100MHz/133MHz , 16bit  
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SUMMARY OF PRODUCT  
4.4.4 SPGPm Internal Block Diagram  
ARM946E -S CORE  
16KB ICACHE  
16KB DCACHE  
EXTERNAL  
DMA CONTROLLER  
USB2.0  
(4CH)  
ROM  
CONTROLLER  
ADDR/  
DATA  
MUX  
ARBITER  
AHB BUS  
IO  
CONTROLLER  
DECODER  
MAC  
SYSTEM  
BUS  
INTERFACE  
SFR BUS  
INTERFACE  
SYSMAC  
CLOCK & RESET  
GENERATOR  
PVC  
SYSTEM PLL  
(120MHz)  
HPVC  
512x8  
4096x16  
SYSTEM BUS  
ARBITER  
UART(3CH)  
SDRAM  
CONTROLLER  
(5CH)  
ENGINE  
CONTROLLER  
LSU I/F  
PULSE WIDTH  
MODULATOR  
HCT  
MOT OR  
CONTROLLER  
128x16 x2  
ADC (3CH)  
gCODEC  
PARALLEL PORT  
INTERFACE  
GRAPHIC  
EXECUTION  
UNIT  
MISC  
CONTROLLER  
EPI  
ROTATOR/  
SCALER/  
ENGINE  
Comm. I/F  
HALFTONER  
1024x8, 256x8x 4  
INTERRUPT  
CTRL (5CH)  
TIME CONTROL  
UNIT  
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4.5 SMPS & HVPS  
The SMPS supplies the DC power to the system.  
It takes 110V/220V and outputs the +3.3V, +5V and +24V to supply the power to the main board and ADF  
board.  
The HVPS part creates the high voltage of THV/MHV/Supply/Dev and supplies it to the developer part for  
making the best condition to display the image. The HVPS part takes the 24V and outputs the high voltage  
for THV/MHV/BIAS, and the outputted high voltage is supplied to the toner, OPC cartridge, and transfer  
roller.  
F2  
F1  
CN3  
(FAN CON.)  
CN4  
(PANEL CON.)  
110V : 125V/3A  
220V : 250V 2A H  
110V : 125V/8A  
220V : 250V T 5A H  
THV  
CN1  
(H/L CON.)  
DEV  
MHV  
OPC  
SUPPLY  
COVER OPEN SWITCH  
MANUAL SENSOR  
FEED SENSOR  
PAPER-EMPTY SENSOR  
EXIT SENSOR  
F101  
MAIN PBA CON.  
250V L2A  
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4.5.1 HVPS(High Voltage Power Supply)  
1) Transfer High Voltage (THV+)  
- Function: It is a voltage to transfer a toner developed on OPC drum to a paper.  
- Output voltage: Maximum +5.0KV ±5% (Duty changeable, unload)  
- 1.0KV ±15%(When cleaning, 200MOhm)  
- Error: If THV (+) doesn't output, a ghost status (same character is printed after one cycle (76mm)  
of OPC) with a low density occurs due to a toner on OPC drum cannot normally transfer to a  
paper.  
2) Charge Voltage (MHV)  
- Function: It is a voltage to charge entire surface of OPC with -900V ~ -1000V.  
- Output voltage: -1.3KV ~ 1.8KV DC ±50V  
- Error: If MHV doesn't output, a black paper is printed out because toner on developing roller  
moves to OPC drum due to the surface of OPC is not charged.  
3)Cleaning Voltage (THV-)  
- Function: It removes a dirty on a surface by sending a minus toner in a transfer roller to an OPC  
drum to recover toners.  
- Output Voltage: There is no feedback control, so change range of output is big up to load.  
- Error: Toner contamination occurs at a backside of a printed-paper.  
4) Developing Voltage (DEV)  
- Function: It is a voltage to develop a toner with using a difference of electronic potential on an  
exposed part by LSU (Laser Scanning Unit).  
* Generally, the electronic potential of exposed OPC is -180V and exposed developer is -350V  
when printing, so toner with minus (-) is developed on an exposed part.  
- Output voltage: -200V ~ 600V DC ±20V  
- Error: 1. If DEV is GND, a density is going significantly down.  
2. If DEV is floating due to instable contacting point of terminal, and etc., a density is signif-  
icantly going up.  
5) Supply Voltage(SUP)  
- Function: It is a voltage to supply toner to a developing roller.  
- Output voltage: : -400V ~ 800V DC °æ 50V(Use ZENER, DEV gear)  
- Error: 1. If SUP is GND, a density is dramatically going down.  
2. If SUP is floating due to instable contacting point of terminal, and etc., a density is signif-  
icantly going down as much as it cannot be recognized with eyes.  
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4.5.2 SMPS(Switching Mode Power Supply)  
It is the power source for the whole system. It is an independent module, so it is possible to use for com-  
mon use. It is mounted at the bottom of the set.  
It is consisted of the SMPS part, which supplies the DC power for driving the system, and the AC heater  
control part, which supplies the power to fuser. SMPS has three outputting channels (3.3V, +5V and +24V).  
There are three kinds of power, 120V exclusive (America), 220V exclusive (Europe), and 220V for china  
(nations with instable power supply).  
1) AC Input  
- Inputting rated voltage : AC 220V ~ 240V AC 120V / AC 220V  
- Inputting voltage fluctuating range : AC 198V ~ 264V AC 90V ~ 135V / AC 198V ~ 264V  
- Rated frequency : 50/60 Hz  
- Frequency fluctuating range : 47 ~ 63 Hz  
- Inputting voltage : Under 4.0Arms/2.0Arms  
(The state when lamp is off or rated voltage is inputted/outputted)  
2) Rated Power Output  
NO  
1
Item  
CH1  
CH2  
CH3  
Remark  
Channel name  
CONNECTOR PIN  
+3.3V  
+5V  
+24.0V  
2
CON 3  
CON3  
CON 3  
3.3V PIN: 3, 4  
GND PIN: 5, 6  
5V PIN : 8  
GND PIN: 7  
24V PIN: 11, 12, 13  
GND : 9. 10  
3
Rated outputting voltage  
3.3V ± 5%  
+5V ± 5%  
+24V ± 10%  
(3.2 ~ 3.4V)  
(4.75 ~ 5.25V)  
(21.6 ~ 26.4V)  
4
5
6
7
8
9
Maximum outputting voltage  
Peak loading voltage  
Ripple noise voltage  
Maximum output  
Peak output  
1.0 A  
0.14A  
2.0 A  
1.5 A  
0.14A  
2.0 A  
1ms  
1ms  
100mVp-p  
3.3W  
100mVp-p  
0.35W  
0.7W  
500mVp-p  
48W  
4.95W  
Logic part  
60W  
Uses  
LSU LD  
Main Motor  
HVPS  
Solenoid  
Fan  
3) Consumption Power  
NO  
Item  
CH1  
CH2  
CH3  
System  
(+3.3V)  
(+5V)  
(+24V)  
1
2
3
Stand-By  
1.0 A  
1.0 A  
0.8A  
0.07A  
0.14A  
0.01A  
0.4 A  
2.0 A  
0.4A  
AVG : 55 Wh  
AVG : 250 Wh  
AVG : 10 Wh  
PRINTING  
Sleep-Mode  
4) Length of Power Cord : 1830 ± 50mm  
5) Power Switch : Use  
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6) Feature  
- Insulating resistance : over 50MΩ (at DC500V)  
- Insulating revisiting pressure : Must be no problem within 1min. (at 1500Vzc, 10mA)  
- Leaking voltage : under 3.5mA  
- Running voltage : under 40A peak (at 25°c, Cold start) Under 60A peak (in other conditions)  
- Rising Time : Within 2Sec  
- Falling Time : Over 20ms  
- Surge : Ring Wave 6KV-500A (Normal, Common)  
7) Environment Condition  
- Operating temperature range : 0°c ~ 40°c  
- Maintaining temperature range : -25°c ~ 85°c  
- Maintaining humid range : 30% ~ 90% RH  
- Operating atmospheric pressure range : 1  
8) EMI Requirement : CISPR ,FCC, CE, MIC, C-Tick,  
9) Safty Requrement  
- IEC950 UL1950, CSA950, C-UL,NOM,TUV,Semko,Nemko,iK,CB, CCC(CCIB),GOST, EPA,  
4.5.3 Fuser AC Power Control  
Fuser (HEAT LAMP) gets heat from AC power. The AC power controls the switch with the Triac, a semicon-  
ductor switch. The 'On/Off control' is operated when the gate of the Triac is turned on/off by Photo triac (insult-  
ing part).  
In the other words, the AC control part is passive circuit, so it turns the heater on/off with taking signal from  
engine control part.  
When the 'HEATER ON' signal is turned on at engine, the LED of PC1 (Photo Triac) takes the voltage and  
flashes. From the blinking light, the Triac part (light receiving part) takes the voltage, and the voltage is sup-  
plied to the gate of Triac and flows into the Triac. As a result, the AC current flows in the heat lamp, and heat  
is occurred.  
On the other hand, when the signal is off, the PC1 is off, the voltage is cut off at the gate of Triac, the Triac  
becomes off, and then the heat lamp is turned off.  
1) Triac (THY1) feature  
- 12A,600V SWITCHING  
2) Phototriac Coupler (PC3)  
- Turn On If Current : 15mA ~ 50mA(Design: 16mA)  
- High Repetive Peak Off State Voltage : Min 600V  
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4.6 Engine F/W  
4.6.1 Feeding  
If feeding from a cassette, the drive of the pickup roller is controlled by controlling the solenoid. The on/off  
of the solenoid is controlled by controlling the general output port or the external output port. If feeding  
from a manual feeder, decide to insert the paper according to the operation of the manual sensor, and by  
driving the main motor, insert the paper in front of the feed sensor. While paper moves, occurrence of jam  
is judged as below. (Refer to the [6.2 Paper Transfer rout])  
4.6.1.1 Jam 0  
• After picking up, paper cannot entered due to paper didn’t feed.  
• After picking up, paper entered but it cannot reach to the feed sensor in certain time due to slip, etc.  
• After picking up, if the feed sensor is not on, repack up. After repacking up, if the feed sensor is not on  
after certain time, it is Jam 0.  
- It is a status that the leading edge of the paper doesn’t pass the feed sensor.  
• Even though the paper reaches to the feed sensor, the feed sensor doesn’t be on.  
- It is a status that the leading edge of the paper already passes the feed sensor.  
4.6.1.2 Jam 1  
• After the leading edge of the paper passes the feed sensor, the tailing edge of the paper cannot pass the  
feed sensor after certain time. (The feed sensor cannot be Off)  
• After the leading edge of the paper passes the feed sensor, the paper cannot reach the exit sensor after  
certain time. (The exit sensor cannot be On)  
- The paper exists between the feed sensor and the exit sensor.  
4.6.1.3 Jam 2  
• After the tailing edge of the paper passes the feed sensor, the paper cannot pass the exit sensor after  
certain time.  
4.6.2 Drive  
By gearing, the main motor drives the rollers such as feeding roller, developing roller, fuser roller, and dis-  
tributing roller. The step motor is controlled for the sections, acceleration section and fixed speed section.  
In the initial stage of the motor run, appoint the acceleration section to prevent the isolation of the motor. It  
is controlled by the A3977 motor driver IC. The step signal and the enable signal are sent to make the  
phase for driving the motor in CPU.  
4.6.3 Transfer  
The charging voltage, developing voltage and the transfer voltage are controller by PWM (Pulse Width  
Modulation). The each output voltage is changeable due to the PWM duty. The transfer voltage admitted  
when the paper passes the transfer roller is decided by environment recognition. The resistance value of  
the transfer roller is changed due to the surrounding environment or the environment of the set, and the  
voltage value, which changes due to the environments, is changed through AD converter. The voltage  
value for impressing to the transfer roller is decided by the changed value.  
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4.6.4 Fusing  
The temperature change of the heat roller’s surface is changed to the resistance value through the thermis-  
tor. By converting the voltage value, which impressed to the resistance, to the digital value through the AD  
converter, the temperature is decided. The AC power is controlled by comparing the target temperature to  
the value from the thermistor. If the value from the thermistor is out of the controlling range while controlling  
the fusing, the error stated in the table occurs. (For the domestic model, the Q-PID method has been  
applied.)  
4.6.4.1 Heat Lamp Method  
Error  
Description  
DCU  
LED Displat  
Open heat error  
When warming up, it has been lower  
60 All LED are blinking.  
than 68°C over 28 seconds  
Lower heat error  
• Standby:  
62 All LED are blinking  
It has been lower than 80°C over 10 seconds  
• Printing:  
- 2 consecutive pages: it has been lower than  
145°C over 4 seconds.  
- 3 consecutive page; it has been 25°C lower  
than the fixed fusing temperature over 4 seconds.  
Over heat error  
It have been higher than 220°C over 3 seconds  
68 All LED are blinking  
4.6.4.2 Q-PID Method  
Error  
Description  
DCU  
LED Displat  
Open heat error  
When preheating, it has been lower than 68°C  
60 All LED are blinking  
over 15 seconds.  
Lower heat error  
• After finishing the preheating stage,  
it has not reached 100°C (preheating stop  
temperature) during 15 seconds since the  
temperature is over 68°C.  
62 All LED are blinking  
• Printing  
1) When the main motor is on and after 0.92  
second, it has not reached the 160°C  
during 20 seconds.  
2) From the 2 consecutive pages, it has been  
20°C lower than the fusing temperature  
over 4 seconds.  
Over heat error  
• the error is not displayed immediately when  
it has been over 220°C over 3 seconds.  
The temperature after the 3 seconds is checked.  
If it is over 240°C, it is error.  
68 All LED are blinking  
• If the temperature has been higher than 220°C  
over 25 seconds, it is an error even through the  
temperature doesn’t reach 240°C.  
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SUMMARY OF PRODUCT  
4.6.4.3 What is the Q-PID Method?  
The Q-PID is developed by Samsung, and it saves the preheating time in half in comparison with the existed  
method. It saves not only the printing time for initial print but also it saves the printing speed for the reat-  
tempting print after for a while.  
Air Layer  
Holgen Lamp  
Heat Pipe  
Heating Wire  
Paper  
Toner  
Toner  
Paper  
Pressure Roller  
Pressure Roller  
• After heating the air layer, transfer the heat to the  
surface  
• It takes long time to heat it until it reaches the  
proper temperature.  
• The heat conductivity of the heat pipe is  
100~150 times higher than cooper’s.  
• It is possible to raise the temperature in an  
instant  
• The high temperature is needed when it is stand-  
by status.  
• It saves the dissipation of power in the standby  
status due to high accumulation of heat.  
4.6.5 LSU  
The LSU is consisted of the LD (Laser Diode) and the polygon motor control. When the printing signal occurs,  
it turns the LD and drives the polygon motor. When the receiving light part detects the beam, Hsync occurs.  
When the polygon motor speed becomes a normal, LReady occurs. If two conditions are satisfied, the sta-  
tus bit of the LSU controller register becomes 1 to be judged that the LSU is ready. If two conditions are not  
satisfied, the error shown in below occurs.  
Error  
Description  
DCU  
Polygon motor error  
When the polygon motor’s speed doesn’t  
95  
become a normal  
Hsync error  
The polygon motor’s speed is normal,  
96  
but the Hsync signal is not created.  
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Disassembly and Reassembly  
5. Disassembly and Reassembly  
5.1 General Precautions on Disassembly  
5
When you disassemble and reassemble compo-  
nents, you must use extreme caution. The close  
proximity of cables to moving parts makes proper  
routing a must.  
If components are removed, any cables disturbed  
by the procedure must be restored as close as  
possible to their original positions. Before remov-  
ing any component from the machine, note the  
cable routing that will be affected.  
Releasing Plastic Latches  
Many of the parts are held in place with plastic  
latches. The latches break easily; release them  
carefully.  
To remove such parts, press the hook end of the  
latch away from the part to which it is latched.  
Whenever servicing the machine, you  
must perform as follows:  
1. Check to verify that documents are not stored  
in memory.  
2. Be sure to remove the toner cartridge before  
you disassemble parts.  
3. Unplug the power cord.  
4. Use a flat and clean surface.  
5. Replace only with authorized components.  
6. Do not force plastic-material components.  
7. Make sure all components are in their proper  
position.  
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Disassembly and Reassembly  
5.2 Top Cover  
1. Pull the Cassette out of the printer.  
4. Unlatch the front ends of the Top Cover.  
Cassette  
2. Remove the Front Cover in the direction of  
arrow.  
5. Remove the Top Cover in the direction of arrow.  
Top Cover  
Front Cover  
3. Remove four screws.  
6. Remove the Rear Cover from the Top Cover.  
Rear Cover  
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Disassembly and Reassembly  
5.3 Fuser  
5.3.1 Fuser(Heat Lamp Type)  
1. Before you remove the Fuser, you should  
remove:  
5. Remove one screw and take the Idle Gear out.  
- Top Cover(see page 5-2)  
Idle Gear  
2. Unplug two connectors(Block) from the boards,  
then remove four screws.  
Fuser Ass'y  
6. Remove four screws and divide the Fuser into  
two parts  
Fuser Cover  
3. Remove two screws and take the Thermostat  
out of the Fuser.  
Thermostat  
7. Remove the Thermister from the Fuser Cover.  
4. Remove two screws and take the Halogen  
Lamp out of the Heat Roller.  
Heat Roller  
Thermister  
Halogen Lamp  
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Disassembly and Reassembly  
5.3.2 Fuser(Q-PID Type)  
1. Before you remove the Fuser, you should  
remove:  
4. Remove two screws.  
- Top Cover(see page 5-2)  
2. Unplug two connectors(Block) from the boards,  
then remove four screws.  
Fuser Ass’y  
5. Remove one screw and take the Idle Gear out.  
Idle Gear  
3. Remove two screws and take the Thermostat  
out of the Fuser.  
Thermostat  
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Disassembly and Reassembly  
6. Separate Heat Roller Ass'y after remove six  
screws and after removing 6 screws as shown  
in below, take out the heat roller assembly in  
direction of the arrow while pulling the both side  
of the unit-brush  
7. Unplug Thermister Harness from the Fuser  
cover.  
Thermister Harness  
Fuser Cover  
Unit-Brush  
Heat Roller  
8. Remove one screw and separate Thermister  
from the inter connector Fuser Cover.  
Caution : • Be careful not to damage or contaminate the sur-  
face of the roller when assembling/disassembling  
the heat roller.  
• Additional state: Be careful especially not to dam-  
age the covering of the fusing assembly.  
(If the cover is damaged, it could cause an electric  
leakage.)  
Thermister  
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Disassembly and Reassembly  
5.4 Exit Roller  
1. Before you remove the Fuser, you should  
remove:  
Exit Gear  
Bearing  
- Top Cover(see page 5-2)  
Exit Roller  
2.Remove the Exit Gear, Bearing and Exit Roller  
as shown below  
1
2
5.5 LSU  
1. Before you remove the Fuser, you should  
remove:  
4. Unplug two connector from the LSU  
- Top Cover(see page 5-2)  
2. Remove two screws and unplug one connector  
from the Frame.  
5. Unplug four screws and take the LSU out.  
LSU  
3. Remove the LED PBA Ass’y as shown below.  
LED PBA Cover  
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Disassembly and Reassembly  
5.6 Fan  
1. Before you remove the Fuser, you should  
remove:  
- Top Cover(see page 5-2)  
2. Unplug the connector from the SMPS and  
remove the one screw. Then take out the Fan.  
DC Fan  
5.7 Driver Ass’y  
1. Before you remove the Fuser, you should  
remove:  
3. Unplug one connector from the Driver Ass’y  
- Top Cover(see page 5-2)  
Drive Ass'y  
2. Remove the six screws from the Drive Ass’y.  
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Disassembly and Reassembly  
5.8 Engine Shield Ass’y  
1. Before you remove the Fuser, you should  
remove:  
- Top Cover(see page 5-2)  
- Fuser Connector(see page 5-3)  
2. Remove the fourteen screws securing from the  
Engine Shield Ass’y and unplug the all connec-  
tors. Then take the Engine Shield Ass’y.  
Engine Shield  
Ass'y  
5.9 Main PBA  
1. Before you remove the Fuser, you should  
remove:  
- Top Cover(see page 5-2)  
- Engine Shield Ass’y(see page 5-8)  
Main PBA  
2. Unplug one connector and remove five screws  
from the Main PBA. Then lift the Main PBA out,  
as shown below.  
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Disassembly and Reassembly  
5.10 SMPS  
1. Before you remove the Fuser, you should  
remove:  
3. Remove one screw and unplug one connector  
from the Main PBA.  
- Top Cover(see page 5-2)  
- Engine Shield Ass’y(see page 5-8)  
2. Unplug one connector and remove three screws  
then take the Inlet Ass’y out.  
Inlet Bracket  
4. Remove three screws and take The SMPS out.  
SMPS  
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Disassembly and Reassembly  
5.11 Transfer Roller  
1. Before you remove the Fuser, you should  
remove:  
3. Unplug the PTL Holder Connector, then remove  
the PTL Holder and PTL Lens, as shown below.  
- Top Cover(see page 5-2)  
- LSU(see page 5-6)  
PTL  
Lens  
PTL  
Holder  
2. Remove three screws and take the Transfer  
Earth out.  
Transfer  
Earth  
4. Unlatch the Bush and remove it. Then lift the  
Transfer Roller out, as shown below.  
Transfer  
Roller  
Bush  
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Disassembly and Reassembly  
5.12 Feed Roller  
1. Before you remove the Fuser, you should  
remove:  
5. Remove the Idle Gear and Feed Gear2.  
- Top Cover(see page 5-2)  
- Drive Ass’y(see page 5-7)  
Feed Gear2  
2. Remove two screws from the Guide Paper and  
take it out.  
Guide paper  
Idle Gear  
6. Remove the Feed Gear 1 Ass’y, as shown  
below.  
3. Pull up the Feed Idle Bush and Feed Idle Shaft,  
as shown below.  
Feed Gear1  
Ass'y  
Feed Idle  
Shaft  
Bush  
7. Remove the Feed Roller and Feed Roller 1, as  
shown below.  
4. Remove three screws from the Feed Bracket  
and take it out.  
Feed Roller  
Feed Bracket  
Feed Roller1  
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Disassembly and Reassembly  
5.13 Pick Up Roller & Solenoid  
1. Before you remove the Fuser, you should  
remove:  
4. Remove the Pick up Ass’y, as shown below.  
- Top Cover(see page 5-2)  
- Drive Ass’y(see page 5-7)  
- Engine Shield Ass’y(see page 5-8)  
2. Remove three screws from the Feed Bracket  
and take it out.  
Feed Bracket  
Bush  
1
2
Pick up Ass'y  
5. Remove two screw then remove The Manual  
Solenoid and Pick Up Solenoid.  
3. Remove the Pick up Gear Ass’y, as shown  
below.  
Pick up Gear  
Ass'y  
(Pick up)  
Solenoid  
(Manual)  
Solenoid  
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ALIGNMENT & ADJUSTMENTS  
6. Alignment and Adjustments  
This chapter describes the main functions for service, such as the product maintenance method,  
the test output related to maintenance and repair, DCU using method, Jam removing method, and  
so on. It includes the contents of manual.  
6
6.1 How to use DCU  
6.1.1 DCU Setup  
You can examine the malfunction of the printer. To perform DCU, open the front discharge cover and leave  
the connect the harness wire(10 pin/4 pin) to the CN3(ML-1750) or CN2(ML-1710/1510) of the Main control  
board.  
ML SERIES DIAGNOSTIC CONTROL UNIT  
04 DEV 300  
05 LSU READY  
07 PAPER EMPTY  
08  
DEV 350  
DEV 350  
LSU MT & LD  
PAPER WIDTH  
EXIT SENSOR  
LSU MOTOR  
NEW CRU  
SELF  
TEST  
FEED SENSOR  
09 COVER OPEN  
STATUS  
10 COER HEATING PRINTING TEMP READY HEAT  
DIAGNOSTIC  
ON  
OFF  
DIAGNOSTIC CODE  
00 MAIN MOTOR OPERATING SYSTEM  
STATUS CODE  
61 WARM UP  
MAIN HIGH-VOLTAGE ON  
TRNSFER HIGH-VOLTAGE (-)ON  
THV(+) REFERANCE VOLTAGE  
DEV/SUPPLY HIGH-VOLTAGE ON/PTL ON  
LSU OPERATING SYSTEM  
PICKUP CLUTCH ON  
PEEMPTY/PWITH/NEW CRU TEST  
FEED & EXIT SENSOR TEST  
COVER OPEN SENSOR TEST  
FUSER TEST  
01  
02  
03  
04  
05  
06  
07  
08  
09  
10  
11  
00 READY (REGAL)  
01 READY (LETTER)  
READY (A4)  
READY (EXECUTIVE)  
READY (B5)  
02  
03  
04  
PRINT START  
20  
30  
40  
50  
FEED SENSOR ON  
FEED SENSOR OFF  
PAPER OUT  
HOT BURN TEST  
CLEAN MODE PRINT  
12  
13  
14  
THV(+)TRIGGER, ALL HV & FAN ON  
THV(+) REFERENCE ON  
SLEEP MODE  
69  
ERROR STATUS CODE  
OPEN FUSER ERROR  
LOW TEMPERATURE ERROR  
OVER HEATING ERROR  
COVER OPEN ERROR  
NO PAPERR  
PAPER JAM 0  
PAPER JAM 1  
PAPER JAM 2  
60  
62  
68  
64  
70  
71  
72  
73  
95 LSU NOT READY  
DIAGNOSTIC  
MODE  
DOWN  
UP  
SHIFT  
STOP  
ENTER  
TO ENTER DIAGNOSTIC MODE, PUSH THREE BUTTONS SIMUL ANEOUSL  
AND TURN THE PRINTER POWER ON.  
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ALIGNMENT & ADJUSTMENTS  
6.1.2 Code  
Connect DCU to the printer and turn the power on. It show 7 Segment FND on the panel and each code  
tells the function of the printer.  
1) Normal Code  
While printing or warming up, it indicate the position of the paper  
Code  
61  
State  
Warm up  
Description  
The printer is on, the cover is open or close.  
00~05  
Ready(kind of paper)  
The printer is ready, the paper is detected when the first paper is printed.  
00: Legal ,01: Letter ,02: A4 ,03: EXEC ,04: B5 ,05: Folio, 06: A5/A6  
The engine controller received the print order from the video controller.  
20: 1st, 21: MP, 22: SCF  
20, 21, 22  
Print Start  
30  
40  
50  
69  
Feed Sensor On  
Feed Sensor off  
Paper Out  
The paper is passing out of the Feed Sensor.  
The paper has passed out of the Feed Sensor.  
The paper has passed out of Exit Sensor.  
Sleep Mode  
The fuser power turned off to minimize the power consumption.  
2) Error Code  
When detecting the malfunction, the printing is stopped to indicate error code.  
Code  
State  
Description  
60, 62, 68 Fuser Error  
The error in the fuser occurred. There is a short circuit in the thermistor  
and the thermostat while printing, Low Temperature Error occurs.  
• 60: Open Fuser Error  
• 62: Low Heat Error  
• 68: Over Heat Error  
64  
65  
70  
71  
72  
Cover Open  
CRU Error  
No Paper  
The Printer Cover is open.  
The Toner Cartridge not installed,  
No paper in the paper cassette.  
Paper Jam 0  
Paper Jam 1  
The front part of paper is jammed between pickup unit and Feed sensor.  
The front part of paper is jammed between the Discharge sensor and  
Feed sensor.  
73  
Paper Jam 2  
The front part of paper is jammed just after passing through the discharge  
sensor.  
76  
95  
Out Bin Full  
The Out bin is filled with paper.  
LSU Not Ready  
LSU Scanner Motor not ready or Hsync signal not output.  
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ALIGNMENT & ADJUSTMENTS  
6.1.3 Self Diagnostic Mode  
If Error code occurs due to malfunction of the printer, perform Self Diagnostic Mode to solve the problem.  
The printer works only in the self-test mode to solve the malfunction problem.  
To enter the self-test mode, turn the power on pressing the buttons of [Down], [Shift] and [Stop] at the same  
time.  
Release the button within 2 or 3 seconds if 78 shows in the DCU. If 00 shows in the DCU, press the button  
[Up] or [Shift] to select the self+test , and press the button of [Enter] to operate. To stop, press the button of  
[shift] and [Enter] together.  
Code  
00  
Description  
Main Motor Operating System  
Only the main motor is in operation.  
01  
02  
Main High Voltage On(THV-)  
-1400 voltage output by MHV terminal.  
Caution : High voltage probe should be used.  
Transfer High Voltage(-)On(THV-)  
-1000 voltage output by MHV terminal.  
Caution : High voltage probe should be used.  
03  
04  
Transfer High Voltage (+)Reference on (THV +)  
+800 voltage output by MHV terminal.  
Caution : High voltage probe should be used.  
DEV/supply High Voltage : DEV/Supply High Voltage Test.  
The left one of the three LEDs in the self-test panel is on when DEV high voltage Supply  
high voltage output by each HV terminal(-500V). Press the [Up] button to switch the volt-  
age. The middle and right one of the three LEDs are on and -650 voltage output by DEV  
HV terminal.  
Caution : High voltage probe should be used.  
05  
06  
LSU Operating System  
The scanning motor of LSU is in operation, the right LED of the three buttons on. Press  
the [Up] button to Check LD. LD is functioning and the middle button is on. If the LD is  
normal, all LEDs are on.  
Pickup clutch on  
The Solenoid in the printer is in operation. To stop the operation, Press the button [shift]  
and [Enter] together.  
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ALIGNMENT & ADJUSTMENTS  
Code  
Description  
07  
Paper Empty Sensor Test :  
If activate the Actuator of the PEMPTY Sensor, the left and right of the three LEDs are  
on.  
Paper Empty Sensor ON/OFF  
1st LED ON/OFF  
08  
Feed & Exit Sensor Test  
Test the Feed sensor and Discharge sensor in the same way as '07'.  
Feed Sensor ON/OFF  
Exit Sensor ON/OFF  
2nd LED ON/OFF  
3rd LED ON/OFF  
09  
10  
Cover Open Sensor Test  
Test the Cover Open Sensor in th same way as code '07’  
Cover Open Sensor ON/OFF  
1st LED ON/OFF  
Fuser Test  
If the [Enter] button pressed, the right LED is on and temperature of the fuser is up to  
READY Mode. If the [Up] button pressed, the middle LED is on and temperature of the  
fuser is up to Printing Mode.  
If you press the button once more, the left LED is on and temperature of the fuser is up  
to overheat Mode.  
11  
Hot Burn Test  
If the [enter] button pressed, the printer is continuously printing without detection.  
Turn the power off to stop operation.  
12  
13  
Cleaning Mode Print Mode  
Print the paper to clean the OPC Drum in the Cartridge.  
THV(+) TRIGGER. ALL HV :  
All high voltage output by each HV terminal and LSU and the fan is in operation. In this  
mode, electronic resistance of transfer roller and high voltage is detected.  
14  
15  
16  
17  
PTL Test :  
Indicates the function of the PTL, same method of the code ‘07’.  
Fan Test :  
Indicates the function of the Fan, same method of the code ‘07’.  
Manual Pickup Test :  
Indicates the function of th Manual Pickup, same method of the code ‘07’.  
Manual Sensor Test :  
Indicates the function of the Manual Sensor, same method of the code ‘07’.  
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ALIGNMENT & ADJUSTMENTS  
No.  
Function  
Enter  
Up/ Dow n  
Stop  
Remark  
00  
01  
02  
Motor Run  
Mhv On  
Motor Stop  
Mhv Off  
Motor  
MHV  
-1550V  
Thv Negative On  
Thv Negative Off  
THV(-)  
03  
04  
Thv On  
Dev On  
Thv Off  
Dev Of f  
+1300V  
THV(+)  
DEV  
Supply  
0 : -630V  
DEV  
0 : -430V  
05  
06  
07  
LSU Run  
LSU Stop  
Pickup Off  
LSU  
On  
Off  
Ready  
Pickup On  
Pic kUp  
PEmpty  
Paper Empty  
Cover Open  
08  
09  
Sensor  
Cover  
Ex it  
Feed  
10  
11  
12  
Fuser On  
HotB urn O n  
Clean Printing  
Fuser Off  
Fuser  
HotBurn  
Clean Print  
Thv  
Reference  
PTL  
13  
low  
adequate  
high  
14  
15  
PTL On  
Fan On  
PTL Off  
Fan Off  
FAN  
Manual  
Pic kUp  
Manual  
Sensor  
16  
17  
Manual Pickup On  
Manual Pickup Off  
Manual Sensor  
6.1.4 Self Test Button  
If the Self-Test button pressed, vertical lines are printed.  
Turn the power on while pressing this button, '89' shows in the DCU and the printer is warming up. After  
warming-up the printer is in READY Mode, and '88' shows in the DCU. In this mode, without any detection,  
the printer begins printing(trial printing and data from the PC). It is convenient to use this mode when the  
engine malfunction is detected in the control board.  
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ALIGNMENT & ADJUSTMENTS  
6.2 Paper Path  
3
4
L S U  
CR  
Fuser  
Toner Cartridge  
DR  
OPC  
2
SR  
PR  
7
MP Sensor  
Feed  
Sensor  
FR6  
TR  
5
1
1
2
3
5
6
7
Paper Input (Cassette)  
Paper Empty Sensor  
Paper Feeding Sensor  
Paper Exit Sensor  
Paper Input (Manual Feeder)  
Paper Out(Face Down)  
Paper Out(Face Up)  
4
L
S
U
L
S
U
L
S
U
Fuser  
Toner Cartridge  
CR  
Fuser  
Fuser  
Toner Cartridge  
Toner Cartridge  
CR  
CR  
DR  
OPC  
SR  
EXIT  
PR  
Sensor  
DR  
DR  
OPC  
SR  
OPC  
SR  
EXIT  
EXIT  
PR  
PR  
MP Sensor  
Sensor  
Sensor  
Feed  
Sensor  
TR  
FR  
MP Sensor  
Feed  
MP Sensor  
Feed  
Sensor  
Sensor  
TR  
FR  
TR  
FR  
Empty Sensor  
Empty Sensor  
Empty Sensor  
<Jam0>  
<Jam1>  
<Jam2>  
1) After taking order, the printer feeds the printing paper from the cassette or manual feeder.  
2) The fad paper passes the paper feeding sensor. (Jam 0 occurs if the sensor is not operated after certain  
time passes)  
3) The paper passed the paper feeding sensor moves to the paper exit sensor via printing process. (Jam 1  
occurs if the sensor is not operated after certain time passes)  
4) The paper passed the paper exit sensor moves out from the set. (Jam 2 occurs sometime after if the tail-  
ing edge of the paper is not coming out from the set after the leading edge of paper passes the paper  
exit sensor.)  
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ALIGNMENT & ADJUSTMENTS  
6.3 Clearing Paper Jams  
Occasionally, paper can be jammed during a print job. Some of causes include:  
• The tray is loaded improperly or overfilled.  
• The tray has been pulled out during a print job.  
• The front cover has been opened during a print job.  
• Paper that does not meet paper specifications has been used.  
• Paper that is outside of the supported size range has been used.  
If a paper jam occurs, the On Line/Error LED on the control panel lights red. Find and remove the jammed  
paper. If it is invisible, look inside the printer.  
Do not use a pinset or a sharp metal tool when removing a jam.  
The covering of a metal part can be removed which can cause an electric leakage.  
6.3.1 In the Paper Exit Area (JAM2)  
1) If the paper jams as it exits to the output tray and a  
long portion of the paper is visible, pull the paper  
straight out.  
3) Loosen the paper if it is caught in the feed rollers.  
Then pull the paper gently out.  
When you pull the jammed paper, if there is resis-  
tance and the paper does not move immediately, stop  
pulling. Continue with the next step.  
Note: Please be careful when you open the rear cover.  
The inside of the printer is still hot.  
2) Open the rear output tray.  
4) Close the rear output tray. Open and close the front  
cover. Printing can be resumed.  
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ALIGNMENT & ADJUSTMENTS  
6.3.2 In the Paper Feed Area (JAM0)  
1) Slide out the tray to expose the jammed paper.  
2) Remove any missfeed paper by pulling it out by the visi-  
ble edge from the tray. Make sure that all of the paper is  
properly aligned in the tray.  
3) Slide the tray back into the printer. Open and close the  
front cover. Printing can be resumed.  
6.3.3 Around the Toner Cartridge (JAM1)  
1) Open the front cover and remove the toner cartridge  
2) Gently pull the paper toward you.  
3) Check that there is no other paper in the printer.  
4) Reinstall the toner cartridge, and then close the cover.  
Printing can be resumed.  
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ALIGNMENT & ADJUSTMENTS  
6.3.4 Tips for Avoiding Paper Jams  
By selecting the correct paper types, most paper jams can be avoided. If a paper jam occurs, follow the  
steps outlined in  
• Ensure that the adjustable guides are positioned correctly.  
• Do not overload the tray. Ensure that the paper is below the paper capacity mark on the right inside of  
the tray.  
• Do not remove the paper from the tray while printing.  
• Flex, fan and straighten the paper before loading.  
• Do not use creased, damp or highly curled paper.  
• Do not mix paper types in the input tray.  
• Use only recommended print media.  
• Ensure that the recommended print side is facing down when loading paper into the input tray.  
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ALIGNMENT & ADJUSTMENTS  
6.4 Sample Pattern  
This product has the several sample patterns for maintenance. With the sample patterns, check the exis-  
tence of the abnormality. The patterns help to regularly maintain the product.  
6.4.1 Printing a Demo Page  
Print a demo page or a configuration sheet to make sure that the printer is operating correctly.  
1) Hold down the Cancel button for about 2 seconds to print a demo page.  
Hold down the Cancel button for about 6 seconds to print a configuration sheet.  
2) The Demo page or the configuration sheet shows the printer’s current configuration.  
<Demo Page : ML-1710>  
<Demo Page : ML-1750>  
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ALIGNMENT & ADJUSTMENTS  
<System Data List : PCL Model Only>  
6.4.2 Printing a cleaning sheet  
If you are experiencing blurred, faded or smeared printouts. Printing a cleaning sheet cleans the drum  
inside the toner cartridge. This process will produce a page with toner debris, which should be discarded.  
1) Ensure that the printer is turned on and in the Ready mode with paper loaded in the tray.  
2) Press and hold down the Cancel button on the control panel for about 10 seconds.  
3) Your printer automatically picks up a sheet of paper from the tray and prints out a cleaning sheet with  
dust or toner particles on it.  
Note: The cartridge cleaning process takes some time. To stop printing, turn the power off.  
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ALIGNMENT & ADJUSTMENTS  
6.5 Consumables and Replacement Parts  
The cycle period outlined below is a general guideline for maintenance.  
The example list is for an average usage of 50 transmitted and received documents per day.  
Environmental conditions and actual use will vary these factors.  
The cycle period given below is for reference only.  
COMPONENT  
Pick-up Roller  
REPLACEMENT CYCLE  
60,000 Pages  
Paepr Feeding Roller(Friction Pad)  
Transfer Roller  
60,000 Pages  
60,000 Pages  
Fuser  
60,000 Pages  
Toner Cartridge  
3,000 Pages  
6.6 The LED Status Display by Each Error  
ERROR  
LED Status  
DCU CODE  
Open Fuser Error  
The [Error] LED (red) and the [Toner Save] LED are simultaneously  
flashing every one-second.  
60  
Over Heat Error  
Low Heat Error  
The [Error] LED (orange) and the [Toner Save] LED are  
simultaneously flashing every one-second.  
68  
62  
95  
96  
The [Error] LED (red) and the [Toner Save] LED are simultaneously  
flashing every 4 seconds.  
LSU not Ready Error  
(Pmotor Error)  
The [Error] LED (green) and the [Toner Save] LED are  
simultaneously flashing every one-second.  
LSU Not Ready Error  
(HSYNC Error)  
The printing is stop in the fad status, and the [Error] LED (green) and  
the [Toner Save] LED are simultaneously flashing every 4 seconds.  
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ALIGNMENT & ADJUSTMENTS  
6.7 Periodic Defective Image  
If the delinquent image regularly occurs in the printed-paper, it is due to delinquent or damaged roller.  
Refer to the table in below and check the condition of the roller.  
No  
1
Roller  
Defective image  
75.5mm  
Typical defect  
white spot on black image or black spot  
black spot  
OPC Drum  
2
Charge Roller  
Supply Roller  
Developing Roller  
Transfer Roller  
Heat Roller  
37.7mm  
3
37.0mm  
light or dark horizontal image band  
horizontal image band  
4
35.3mm  
5
45.3mm  
image ghost  
6
64.1mm  
Black spot and image ghost  
black spot on the backside  
7
Pressure Roller  
75.5mm  
L S U  
Fuser  
Toner Cartridge  
2
6
4
1
3
7
MP Sensor  
5
L
S
U
5
6
7
Tramsfer Roller  
1
2
3
4
OPC Drum  
Fuser  
Toner Cartridge  
CR  
DR  
OPC  
SR  
PR  
MP Sensor  
Heat Roller  
Charge Roller  
Supply Roller  
TR  
FR  
Pressure Roller  
Developing Roller  
<Rollers Layout>  
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TROUBLESHOOTING  
7. Troubleshooting  
7.1 Bad image  
7
7.1.1 Vertical Black Line and Band  
1. Straight thin black vertical line occurs in the printing.  
2. Dark black vertical band occur in the printing.  
• Description  
Check and Cause  
Solution  
Digital Printer  
Digital Printer  
Digital Printer  
Digital Printer  
Digital Printer  
1. Damaged develop roller in the Developer.  
Deformed Doctor-blade or cleaning-  
blade.  
1. If causes 1 and 2 occur in the developer  
cartridge, replace the developer and try to  
print out.  
2. Scratched surface of the discharge roller  
in the developer.  
2. Replace the transfer roller if occurred as  
No. 3.  
3. Partly depression or deformation on the  
surface of the transfer roller.  
7.1.2 Vertical White Line  
• Description  
White vertical voids in the image.  
Check and Cause  
Solution  
Digital Printer  
Digital Printer  
Digital Printer  
Digital Printer  
Digital Printer  
1. Foreign matter stuck onto the window of  
internal lenses of LSU mirror.  
1. Foreign matter stuck onto the window :  
Clean the LSU window with recommend-  
ed cleaner(IPA) Clean the window with a  
clean cotton swab.  
2. Foreign matter or toner particles between  
the developer roller and blade.  
2. Foreign matter in the LSU : Open the  
cover of LSU and clean with a cotton  
swab on the surface of the reflex mirror.  
(In case the life of the developer has  
been expired, white lines or light image  
occur in front of the image.)  
3. It may occur when Burr and foreign sub-  
stances are on the window of the devel-  
oper frame.  
3. No 3. : Remove the foreign matter and  
burr of the exposure window.  
(Developer cartridge)  
4. If the fuser is defective, voids occur peri-  
odically at the top of a black image.  
4. No. 4. : Open the front cover and check  
ribs that corresponds to the position of  
the voids. Remove if found.  
5. If the problems are not solved, replace  
the developer cartridge.  
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TROUBLESHOOTING  
7.1.3 Horizontal Black Band  
1. Dark or blurry horizontal stripes occur in the printing periodically.  
(They may not occur periodically.)  
• Description  
Check and Cause  
Solution  
Digital Printer  
Digital Printer  
Digital Printer  
Digital Printer  
Digital Printer  
1. Bad contacts of the voltage terminals to  
developer.  
1. Clean each voltage terminal of the Charge,  
Supply, Develop and Transfer roller.  
(remove the toner particles and paper par-  
ticles)  
2. The rollers of developer may be stained.  
Charge roller = 37.7mm  
2. Clean the right Gear that has relatively  
small gap of the teeth in the OPC.  
Supply roller  
=
37mm  
Develop roller = 35.3mm  
Transfer roller = 45.3mm  
3. If the malfunction persists, replace the  
developer.  
7.1.4 Black/White Spot  
1. Dark or blurry black spots occur periodically in the printing.  
2. White spots occur periodically in the printing.  
• Description  
Check and Cause  
Solution  
Digital Printer  
Digital Printer  
Digital Printer  
Digital Printer  
Digital Printer  
1. If dark or blurry black spots occur periodi-  
cally, the rollers in the Developer may be  
contaminated with foreign matte or paper  
particles.  
1. Run OPC cleaning Mode Print and run the  
Self-test 2 or 3 times.  
( Charge roller : 37.7 mm interval  
OPC drum : 75.5 mm interval)  
2. If faded areas or voids occur in a black  
image at intervals of 75.5 mm, or black  
spots occur elsewhere, the OPC drum  
surface is damaged.  
2. In case of 75.5 mm interval unremovable in  
1, cleanly remove foreign substances stuck  
on the OPC location equivalent to black  
spots and white spots with a dry duster.  
3. If a black image is partially broken, the  
transfer voltage is abnormal or the trans-  
fer roller's life has expired.  
3. The transfer roller guarantees 60.000  
sheets printing. If the roller's life is expired,  
replace it.  
4. In case of 37.7 mm interval unremovable in  
1, take measures as to replace the develop-  
er cartridge and try to print out.  
5. Clean the inside of the set against the paper  
particles and foreign matter in order not to  
cause the trouble.  
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TROUBLESHOOTING  
7.1.5 Light Image  
• Description  
The printed image is light, with no ghost.  
Check and Cause  
Solution  
Digital Printer  
Digital Printer  
Digital Printer  
Digital Printer  
Digital Printer  
1. Develop roller is stained when the toner  
of developer cartridge is almost con-  
sumed.  
1. Check if the Toner Save mode is off.  
2. Ambient temperature is below than 10°C.  
2. Replace the developer cartridge and try to  
print out.  
3. Bad contact caused by the toner stains  
between the high voltage terminal in the  
HVPS and the one in the set.  
3. Wait 30 minutes after printer is powered on  
before you start printing.  
4. Abnormal output from the HVPS.  
4. Clean up the contaminated area by the  
toner.  
5. Replace the HVPS if the problems are not  
solved by the above four directions.  
7.1.6 Dark Image or a Black  
• Description  
The printed image is dark.  
Check and Cause  
Solution  
1. No charge voltage in the engine board.  
( Perform DCU diagnostic code 01)  
1. Clean the high voltage charge terminal.  
2. Charge voltage is not turned on due to  
the bad contacts between power supply  
in the side of the Developer and charge  
terminal of HVPS.  
2. Check the state of the connector which  
connects the engine board and HVPS.  
3. Replace the HVPS if not solved by the  
above direction 1 and 2.  
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TROUBLESHOOTING  
7.1.7 Uneven Density  
• Description  
Print density is uneven between left and right.  
Check and Cause  
Solution  
1. The pressure force on the left and right  
springs of the transfer roller is not even,  
the springs are damaged, the transfer  
roller is improperly installed, or the trans-  
fer roller bushing or holder is damaged.  
1. Replace both the left and right Spring  
Holder.  
2. The toner level is not even on the devel-  
oper roller due to the bad blade.  
2. Occur in the developer cartridge, replace  
the developer and try to print out.  
7.1.8 Background  
• Description  
Light dark background appears in whole area of the printing.  
Check and Cause  
Solution  
Digital Printer  
Digital Printer  
Digital Printer  
Digital Printer  
Digital Printer  
1. Does character exist less than 2%  
per a page, and hasn’t it been used  
long time?  
1. The toner cartridge is basically  
designed to print 3,000 sheets with  
5% image. If it prints more than  
3,000 sheets (around 5,000 sheets)  
with 2% image, a background can be  
occurred.  
2. Does recycle paper be used?  
2. The B/S is not guaranteed if using  
recycle paper.  
3. Has the life span of the developer  
ended?  
3. Replace the developer when the life  
span of it has been ended.  
4. Is the movement(Up and Down) of  
the transfer roller smooth?  
4. Clean the bushing part of the transfer  
roller.  
5. Is the HVPS normal?  
5. If the problem is still not solved,  
replace the developer.  
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TROUBLESHOOTING  
7.1.9 Ghost (1)  
• Description  
Ghost occurs at 75.5 mm intervals of the OPC drum in the whole printing.  
Check and Cause  
Solution  
Digital Printer  
Digital Printer  
1. Bad contacts caused by contamination  
from toner particles between high voltage  
terminal in the main body and the elec-  
trode of the Developer.  
1. Clean the terminals when contaminated by  
toner particles.  
Digital Printer  
Digital Printer  
Digital Printer  
Digital Printer  
2. Bad contacts caused by contamination  
from toner particles between high voltage  
terminal in the main body and the one in  
the HVPS board.  
2. Occur in the developer cartridge, replace  
the developer and try to print out.  
3. The life of developer is expired.  
3. Replace the engine board if not solved by  
the above directions 1-2.  
4. Transfer roller lifetime(60.000 sheets) has  
expired.  
4. If not solved by the direction 3, check the  
transfer roller lifetime and replace it.  
5. Abnormal low temperature(below 10°C).  
5. Wait about 1 hour after power on before  
using printer.  
7.1.10 Ghost (2)  
Ghost occurs at 75.5 mm intervals of the OPC drum in the whole printing.  
(When printing on card stock or transparencies using manual feeder)  
• Description  
Check and Cause  
Solution  
Digital Printer  
Digital Printer  
When printing on card stock thicker than nor-  
mal paper or transparencies such as OHP,  
higher transfer voltage is required.  
Select 'Thick Mode' on paper type menu from  
the software application and after using return-  
ing to the original mode is recommended.  
Digital Printer  
Digital Printer  
Digital Printer  
Digital Printer  
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TROUBLESHOOTING  
7.1.11 Ghost (3)  
• Description  
White ghost occurs in the black image printing at 32mm intervals.  
Check and Cause  
Solution  
Digital Printer  
Digital Printer  
1. The life of the developer may be expired.  
1. Occur in the developer cartridge, replace  
the developer and try to print out.  
Digital Printer  
Digital Printer  
2. The abnormal voltage and bad contact of  
the terminal of the supply roller  
2. Check the approved voltage of the supply  
roller and contact of the terminal and adjust  
if necessary.  
Digital Printer  
Digital Printer  
7.1.12 Ghost (4)  
• Description  
Ghost occurs at 47 mm intervals.  
Check and Cause  
Solution  
Digital Printer  
Digital Printer  
The temperature of the fuser is maintained  
high.  
1. Disassemble the fuser and remove the  
contaminated toner particles on the roller  
and clean the foreign matter between  
Thermistor and Heat roller.  
Digital Printer  
Digital Printer  
Digital Printer  
Digital Printer  
(
Caution : can be deformed)  
7.1.13 Satins on the Face of Page  
• Description  
The background on the face of the printed page is stained.  
Check and Cause  
Solution  
Digital Printer  
Digital Printer  
Digital Printer  
Digital Printer  
Digital Printer  
1. Toner leakage due to improperly sealed  
developer.  
1. Replace the developer cartridge.  
2. If the transfer roller is contaminated, satins  
on the face of page will occur.  
2. If the transfer roller is contaminated, run PC  
Cleaning Mode Print 2 or 3 times.  
And perform Self-Test 2 or 3 times to  
remove contamination.  
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TROUBLESHOOTING  
7.1.14 Satins on Back of Page  
• Description  
The back of the page is stained at 47 mm intervals.  
Check and Cause  
Solution  
Digita
Digita
Digital Printer  
Digital Printer  
Digital Printer  
1. Transfer roller is contaminated.  
1. Perform the OPC Cleaning Mode Print 2 or  
3 times. Run Self-Test to remove the conta-  
mination of the transfer roller.  
2. Pressure roller is contaminated.  
2. Replace the transfer roller if contaminated  
severely.  
3. Disassemble the fuser and clean the  
H/R(Heat Roller) and P/R(Pressure roller).  
And check the area between H/R and  
Thermistor. If contaminated, clean the area  
not to be deformed.  
7.1.15 Blank Page Print out (1)  
• Description  
Blank page is printed.  
Check and Cause  
Solution  
Bad ground contacts in OPC and/or devel-  
oper.  
Remove contamination of the terminals of the  
developer and the unit.  
7.1.16 Blank Page Print out (2)  
1. Blank page is printed.  
2. One or several blank pages are printed.  
• Description  
3. When the printer turns on, several blank pages print.  
Check and Cause  
Solution  
1. Bad ground contacts in OPC and/or  
developer.  
1. Remove contamination of the terminals of  
the developer.  
2. Abnormal solenoid.  
2. Perform the engine self test using DCU to check  
if the Solenoid is normal.(refer to code 06)  
3. If not solved by the above directions 1-2,  
Replace the engine board.  
4. Turn the power off, delete the data of PC  
and try printing again.  
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TROUBLESHOOTING  
7.2 bad discharge  
7.2.1 Wrong Print Position  
• Description  
Printing begins at wrong position on the paper.  
Check and Cause  
Solution  
Wrong sense time caused by defective feed sensor  
actuator.  
Replace the defective actuator  
7.2.2 JAM 0  
L S U  
• Description  
Fuser  
Toner Cartridge  
CR  
DR  
OPC  
SR  
EXIT  
PR  
Sensor  
1. Paper is not exited from the cassette.  
MP Sensor  
Feed  
Sensor  
TR  
FR  
2. Jam-0 occurs if the paper feeds into the printer.  
R
/
CK  
I
P
Empty Sensor  
Check and Cause  
Solution  
1. Check the Solenoid by using DCU diagnostic mode  
06.  
1. Replace the solenoid.  
2. Check if the pad is loose due to bad sealing of the  
side-pad.  
2. Replace the side-pad Assembly L or R, if necessary.  
3. Check the surface of the roller-pickup for foreign mat-  
ter.  
3. Clean with soft cloth dampened with IPA(Isopropyl  
Alcohol) or water.  
4. If the paper feeds into the printer rand Jam 0 occurs,  
perform DCU to check feed-sensor of the engine  
board.  
4. Replace the SMPS-HVPS and/or Sensor.  
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TROUBLESHOOTING  
7.2.3 JAM 1  
L S U  
CR  
• Description  
Fuser  
Toner Cartridge  
DR  
OPC  
SR  
EXIT  
PR  
Sensor  
1. Recording paper is jammed in front of or inside the fuser.  
2. Recording paper is stuck in the discharge roller and in the  
fuser just after passing through the Actuator-Feed.  
MP Sensor  
Feed  
Sensor  
TR  
FR  
R
/
CK  
I
P
Empty Sensor  
Check and Cause  
Solution  
1. If the recording paper is jammed in front of or inside  
the fuser. (Perform DCU diagnostic code 08)  
1. Replace the SMPS.  
2. If the recording paper is stuck in the discharge roller  
and the fuser just after passing through the Actuator-  
Feed, Feed Actuator may be defective.  
2. Reassemble the Actuator-Feed and Spring-Actuator  
if the returning is bad.  
7.2.4 JAM 2  
L S U  
• Description  
Fuser  
Toner Cartridge  
CR  
DR  
OPC  
SR  
EXIT  
1. Recording paper is jammed in front of or inside the fuser.  
2. Recording paper is stuck in the discharge roller and in the  
fuser just after passing through the Actuator-Feed.  
PR  
Sensor  
MP Sensor  
Feed  
Sensor  
TR  
FR  
R
/
CK  
I
P
Empty Sensor  
Check and Cause  
Solution  
1. If the paper is completely fed out of the printer, but Jam  
2 occurs : Exit sensor is defective.  
1. Check if the exit sensor actuator is defective.  
• Check if the actuator exit is unformed (Check if the  
lever part is unformed in shape).  
• After the paper is completely discharged, actuator  
Exit should return to the original position to shut the  
photo-sensor. Sometimes it takes longer hour than it  
should and does not return.  
• Check whether burrs occur in the assembly part of  
the actuator exit or not and if the actuator is  
smoothly operated.  
• Check if foreign matters and wire get caught in the  
actuator exit's operation.  
2. If the paper is rolled in the Fuser Roller:  
• This occurs when a Guide claw is broken away or  
transformed.  
2. If the paper is stuck in the fuser : disassemble the  
fuser and remove the jammed paper, and clean the  
surface of the pressure roller with dry gauze.  
• It occurs when the Spring of a Guide claw is broken  
away or transformed.  
• It occurs when the Heat-Roller or Pressure-Roller is  
seriously contaminated with the toner.  
3. Paper is accordion in the fuser.  
3. Remove the jammed paper after disassembling the  
fuser : Clean the surface of the pressure roller with  
dry gauze.  
• Remove the toner particles stained on the rib.  
• Check the assemblage and performance of the exit.  
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TROUBLESHOOTING  
7.2.5 Multi-Feeding  
• Description  
Multiple sheets of paper are fed at once.  
Check and Cause  
Solution  
1. Solenoid malfunction(the solenoid does not work  
properly): Perform DCU Diagnostic Code 06.  
1. Replace the solenoid if necessary.  
2. Pad-Friction is contaminated with foreign matter.(oil...)  
3. The face of paper is blended.  
2. Clean the pad friction with soft clothe dampened  
with IPA(Isopropyl Alcohol).  
3. Use the smooth paper.  
7.2.6 Paper rolled in the Fuser  
• Description  
If contaminated at intervals of 57mm on the back of a paper.  
Check and Cause  
Solution  
1. Contamination of the pressure roller or heat  
roller (Background, Hot off set).  
1. After disassembling the fuser, clean contami-  
nation between the heat roller and the ther-  
mostor and remove the contamination of the  
pressure roller.  
2. Check the claw of the fuser whether it is unfit-  
ted.  
2. If there is heavy background, repair it by the  
background troubleshooting method.  
3. The surface of the heat roller with IPA or  
water  
4. Check the warp or separation of the sprint  
claw and the holder plate claw, and then man-  
age it.  
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TROUBLESHOOTING  
7.2.7 Paper rolled in the Toner Cartridge (OPC Drum)  
• Description  
Paper is rolled up in the OPC.  
Check and Cause  
Solution  
1. Paper is too much thin.  
1. Recommend to use normal paper.  
2. The face of paper is curled.  
2. How to remove the rolled in the OPC Drum.  
• Remove the paper while turning the OPC  
Drum against the ongoing direction.  
• C;eam fomger[romts on the OPC Drum  
spft;u with IPA(Isopropyl Alcohol) or tissue.  
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TROUBLESHOOTING  
7.3 Malfunction  
7.3.1 All LEDs blinking (Fuser Error)  
1. All the lamps on the operator panel blink.  
2. Gear of the fuser does not work and breaks away melt away.  
• Description  
When printing, motor breaks away from its place due to defective fuser gear.  
Check and Cause  
Solution  
1. Check if the thermostat, AC wire and Heat Lamp is  
open.  
1. If the thermostat is open replace the fuser and  
check following items.  
2. Check if the thermistor sensor is in place.  
2. If the thermistor sensor device is located deep in the  
sponge, replace the fuser.  
3. Check if the heat lamp works properly.  
3. Check if the circuit of overheat mode works properly.  
4. Run DCU mode : Perform DCU diagnostic code 10.  
5. Replace Fuser.  
4. Check if the overheat circuit works properly.  
5. The fuser gear is defective due to melting away.  
7.3.2 All LEDs blinking (Scan Error)  
• Description  
1. All lamps on the operator panel blink.  
Check and Cause  
Solution  
DCU Mode : Perform DCU diagnostic code 05. If the DCU  
error code 95 is displayed, replace LSU.  
Replace LSU.  
If you cannot solve the problem after you replace LSU,  
replace the main board.  
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TROUBLESHOOTING  
7.3.3 Not function of the gear of the fuser due to melting away  
• Description  
The motor breaks away from its place due to gear melting away.  
Check and Cause  
Solution  
DCU Mode : Check if the Error States '60' '62' '68' occur.  
Check the operation of Fuser Erasing Lamp  
On/Off with the Error Code Check -10-.  
1. Replace the Fuser.  
2. Replace the Main Control board.  
7.3.4 Paper Empty  
• Description  
The paper lamp on the operator panel is on even when paper is loaded in the cassette.  
Check and Cause  
Solution  
1. Bending or deformation of the actuator of the paper sen-  
sor.  
1. Replace the defective actuator.  
2. The function of the engine board is defective Perform  
DCU mode : Perform DCU diagnostic code 8.  
2. Replace the engine board.  
7.3.5 Paper Empty without indication  
• Description  
The paper lamp on the operator panel does not come on when the paper cassette is empty.  
Check and Cause  
Solution  
1. Bending or deformation of the actuator of the paper sen-  
sor.  
1. Replace the defective actuator.  
2. The function of the engine board is defective Perform.  
DCU mode : Perform DCU diagnostic code 8.  
2. Replace the engine board.  
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7.3.6 Cover Open  
• Description  
The ERROR lamp is on even when the print cover is closed.  
Check and Cause  
Solution  
1. The Hook Lever in the top cover may be defective.  
1. Replace the hook lever, if defective.  
2. Check the connector (Engine B’d↔ HVPS) and circuit of  
the cover switch department in the Main Control board.  
Perform DCU mode : If Error state '64' occurs, Check the  
related codes of the Cover Open Error.  
2. Check the insertion of the Cover Open S/W  
Connect.  
3. Replace the Main Control board or Cover Open  
S/W.  
7.3.7 No lamp on when the cover is open  
• Description  
The ERROR lamp does not come on even when the printer cover is open  
Check and Cause  
Solution  
1. Check the connector(CN8) and circuit of the cover switch  
department in the Main Control board. Perform DCU  
mode : If Error state '64' occurs, Check the related codes  
of the Cover Open Error  
1. Check the insertion of the Cover Open S/W  
Connect.  
2. Replace the Main Control board or Cover Open  
S/W.  
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7.3.8 Defective motor operation  
• Description  
Main motor is not driving when printing, and paper does not feed into the printer, resulting 'Jam 0'.  
Check and Cause  
Solution  
1. Motor harness or sub PCB may be defective.  
1. Check the motor harness, replace it, if defective.  
2. Perform DCU diagnostic code 00 and Check the motor  
operation.  
2. Replace the SMPS, if necessary.  
7.3.9 No Power  
• Description  
When system power is turned on, all lamps on the operator panel do not come on.  
Check and Cause  
Solution  
1. Check if the power input and SMPS output are normal.  
1. Replace the power supply cord or SMPS.  
2. Check the inferiority of LED-Panel on the front-cover if  
the LED of Panel does not appear after normal warming-  
up.  
2. Replace the control board.  
3. Replace the LED-panel.  
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TROUBLESHOOTING  
7.3.10 Vertical Line Getting Curved  
• Description  
When printing, vertical line gets curved.  
Check and Cause  
Solution  
1. If the supply of +24v is unstable in the Main Control board  
linking with LSU, check drive by DCU Mode : LSU Check  
-05- LSU Motor on.  
1. Replace LSU.  
2. Replace the Main Control board.  
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TROUBLESHOOTING  
7.4 Toner Cartridge Service  
It is not guaranteed for the default caused by using other toner cartridge other than the cartridge supplied  
by the Samsung Electronic or caused by non-licensed refill production.  
7.4.1 Precautions on Safe-keeping of Toner Cartridge  
Excessive exposure to direct light more than a few minutes may cause damage to the cartridge.  
7.4.2 Service for the Life of Toner Cartridge  
If the printed image is light due to the life of the toner, you can temporarily improve the print quality by  
redistributing the toner(Shake the toner cartridge), however, you should replace the toner cartridge to solve  
the problem thoroughly.  
7.4.3 Redistributing Toner  
When toner is low, faded or light areas may appear on a printed page. You may be able to temporarily  
improve the print quality by redistributing the toner. The following procedures may allow you to finish the  
current print job before replacing the toner cartridge.  
1) Grasp the front cover and pull it toward you to  
open.  
3) Gently shake the toner cartridge from side to side  
five or six times to redistribute the toner.  
2) Remove the toner cartridge from the printer  
Note :  
If the toner gets on your clothing, wipe it off with a dry  
cloth and wash clothing in cold water. Hot water sets  
toner into fabric.  
Note :  
Avoid reaching too far into the printer. The fusing  
area may be hot.  
To prevent damage to the toner cartridge, do not  
expose it to light for more than a few minutes.  
4) Reinsert the toner cartridge into the printer.  
Ensure that the toner cartridge snaps into place.  
5) Close the front cover. Make sure that the cover is  
securely closed.  
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TROUBLESHOOTING  
7.4.4 Signs and Measures at Poor toner cartridge  
Fault  
Signs  
Cause & Check  
Solution  
Light image and  
partially blank  
image  
• The printed image  
is light or unclean  
and untidy.  
1. If the image is light or unclean 1. All of 1, 2, 3 above-  
and untidy printed image -  
Shake the developer and  
then recheck.  
(1)NG : Check the weight of  
the developer  
If it become better by shaking,  
replace with a new developer  
after 35.3-100 sheets in the  
closing state of the life span.  
(The life is ended.)  
• Some part of the  
image is not print-  
ed.  
Digital Printer  
Digital Printer  
Digital Printer  
Digital Printer  
Digital Printer  
(2)OK : Lack of toner, so the  
life is nearly closed.  
• Periodically a noise 2. Some part of image is not  
as "tick tick" occurs.  
2. In case of 2-  
printed - Shake the develop-  
er and then recheck.  
(1)NG : Check the weight of  
the developer and  
If it becomes better after clean-  
ing the LSU window, then the  
developer is normal.  
(Because of foreign substance  
on the LSU window, the image  
has not been printed partly.)  
clean the LSU window  
with a cotton swab,  
then recheck.  
(2)OK : Lack of toner, so the  
life is nearly closed.  
3. Periodically a noise as "tick  
tick" occurs - Measure the  
cycle and the weight of the  
developer.  
3. In case of 3-  
If the cycle of noise is about 2  
seconds, the toner inside the  
developer has been nearly  
exhausted.( Purchase and  
replace with a new developer  
after using about 200 sheets at  
the point of occurrence)  
4. In case of 3-  
4. White vertical stripes on the  
whole screen or partly :  
Check the weight of the  
developer.  
This is a phenomenon caused  
by lack of toner, so replace with  
a new developer.  
Toner  
Contamination  
• Toner is fallen on  
the papers periodi-  
cally.  
1. Toner is fallen on the paper  
periodically.  
(1)Check the cycle of the  
falling of the toner.  
1. If both ends of the OPC drum  
are contaminated with toner:  
Check the life of the developer.  
• Contaminated with  
toner on prints part-  
ly or over the whole  
surface.  
(2)Check the appearance of  
both ends of the developer  
OPC drum.  
2.The center of the printed mat-  
ter is contaminated with toner.  
(1)Check whether foreign sub-  
stances or toner are stuck  
to the terminal (contact  
point) of the developer.  
(2)Check whether the state of  
the terminal assembly is  
normal.  
2. Check whether it could be recy-  
cled.  
3. If it cannot be recycled:  
Replace the developer.  
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TROUBLESHOOTING  
Fault  
Signs  
Cause & Check  
Solution  
1. If light or dark periodical black  
dots occur, this is because the  
developer rollers are contami-  
nated with foreign substance  
or paper particles.  
(1)37.7mm interval : Charged  
roller  
(2)75.5mm interval : OPC cycle  
White Black spot  
• Light or dark black  
dots on the image  
occur periodically.  
1. In case of 1 above -  
Run OPC Cleaning Mode Print  
4-5 times repeatedly to remove.  
Especially check foreign sub-  
stance on the OPC surface, then  
remove them with a clean gauze  
moistened with IPA(Isopropyl  
Alcohol) not to damage OPC if  
necessary.  
Digital Printer  
Digital Printer  
Digital Printer  
Digital Printer  
Digital Printer  
• White spots occur  
in the image period-  
ically.  
Never use usual alcohol.  
2. If white spots occur in a black  
image at intervals of 75.5mm,  
or black spots occur else-  
where, the OPC drum is dam-  
aged or foreign substance is  
stuck to the surface.  
2. In case of 2  
If they are not disappeared by  
running OPC Cleaning Mode  
Print 4-5 times.  
:
at intervals of 37.7mm - Replace  
the developer.  
: at intervals of 75.5mm - Remove  
foreign substance.  
: Broken image - Replace the  
developer according to careless-  
ness.  
3. If a black and white or graphic 3. In case of 3 - Exchange the  
image is partially broken at  
irregular intervals, the transfer  
roller's life has been expired or  
the transfer voltage is abnor-  
mal.  
transfer roller because the life of  
the transfer roller in use has been  
expired. (Check the transfer volt-  
age and readjust if different.)  
Recycled product • Poor appearance of 1. Poor appearance of the devel- 1. In case of 1 -  
the developer.  
oper.  
(1)If there is an evidence of disas-  
sembling the developer.  
(2)If materials other than normal  
parts of the developer are  
added or substituted.  
(1)Check the damage to label  
and whether different materi-  
als are used.  
(2)Check the appearance of  
parts of the developer, such  
as frame, hopper.  
• Unclean and rough  
printouts.  
• Bad background in  
the image.  
2. Unclean and rough printouts.  
(1)Check whether foreign sub-  
stance or toner are stuck to  
the terminal (contact point) of  
the developer.  
(2)Check whether the state of  
the terminal assembly is nor-  
mal.  
2. In case of 2 - If there are any  
abnormals in connection with the  
situation of 1.  
(1)It occurs when the developer  
is recycled over 2 times.  
(2)If toner nearly being expired  
are collected to use, it is  
judged as the recycled devel-  
oper.  
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TROUBLESHOOTING  
7.5 Bad Environment of The Software  
7.5.1 The printer is not working (1)  
• Description  
While Power turned on, the printer is not working in the printing mode.  
Check and Cause  
Solution  
1. Run Self-Test Mode : Turn the power on while pressing  
the test printing button for 2 or 3 seconds before printing  
works.  
1.Check the power of the printer and perform the Self-  
Test. If the test printing works, that means no prob-  
lems in the printer itself. If the test printing does not  
work, that means bad functioning of the printer(not  
because of software). Perform DCU to check the  
Error Status.  
2. Check if the PC and the printer is properly connected  
and the toner cartridge installed.  
2. Replace the printer cable. If the problems not solved  
even after the cable replaced, check the amount of  
the remaining tone.  
(refer to Toner Cartridge Service 7.4)  
3. Printing is nor working in the Windows.  
3. Check if the connection between PC and printer port  
is proper. If you use windows, check if the printer dri-  
ver in the controller is set up. If the printer driver is  
properly set up, check in which program the printing  
is not working. The best way to find out is to open the  
memo pad to check the function of printing. If it is not  
working in a certain program, adjust the setup the  
program requires. Sometimes, the printout is normal  
within the Windows basic programs, but it's not work-  
ing in a particular program. In such case, install the  
new driver again. If not working in the Windows basic  
program, Check the setup of the port of CMOS is on  
ECP. And check the address of IRQ 7 and 378  
4. If the scanner needs to be connected to the printer,  
first the remove the scanner from the PC to see if the  
printer is properly working alone.  
4. Check if the printer cable is directly connected to periph-  
eral devices  
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TROUBLESHOOTING  
7.5.2 The printer is not working (2)  
After receiving the printing order, no response at all or the low speed of printing  
occurs due to wrong setup of the environment rather than malfunction of the printer itself.  
• Description  
Check and Cause  
Solution  
1. Secure more space of the hard disk.  
1. Not working with the message 'insufficient printer  
memory' means hard disk space problem rather than  
the RAM problem. In this case, provide more space  
for the hard disk. Secure more space using the disk  
utilities program.  
2. Printing error occurs even if there is enough space in  
the hard disk.  
2. The connection of the cable and printer port is not  
proper. Check if the connection is properly done and  
if the parallel port in CMOS is rightly set up.  
3. Check the parallel-port-related items in the CMOS  
Setup.  
3. As a printer port, Select ECP or SPP among  
SPP(Normal), ECP, and EPP modes(increase print-  
ing speed) SPP normal mode support 8-bit data  
transfer, while ECP Mode transfer the 12-bit data.  
4. Reboot the system to print.  
4. If the regular font is not printing, the cable or the  
printer driver may be defective.  
Turn the PC and printer off, and reboot the system  
to print again. If not solved, double-click the printer in  
my computer If the regular fonts are not printed this  
time again. the cable must be defective so replace  
the cable with new one.  
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TROUBLESHOOTING  
7.5.3 Abnormal Printing  
The printing is not working properly even when the cable has no problem.  
(even after the cable is replaced)  
If the printer won't work at all or the strange fonts are repeated, the printer driver may be defec-  
tive or wrong setup in the CMOS Setup.  
• Description  
Check and Cause  
Solution  
1. Set up the parallel port in the CMOS SETUP.  
1. Select SPP(Normal) or ECP LPT Port the among  
ECP, EPP or SPP in the CMOS Setup.  
2. Printer Driver Error.  
2. Check the printer in My Computer.(to see if the  
printer driver is compatible to the present driver or  
delete the old driver, if defective and reinstall the new  
driver)  
3. Error message from insufficient memory.  
(The printing job sometimes stops or due to insufficient  
virtual memory, but it actually comes from the insuffi-  
cient space of the hard disk.)  
3. Delete the unnecessary files to secure enough  
space of the hard disk and start printing job again.  
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TROUBLESHOOTING  
7.5.4 SPOOL Error  
To spool which stands for "simultaneous peripheral operations online" a computer document or  
task list (or "job") is to read it in and store it, usually on a hard disk or larger storage medium so  
that it can be printed or otherwise processed at a more convenient time (for example, when a  
printer is finished printing its current document).  
• Description  
Check and Cause  
Solution  
1. Insufficient space of the hard disk in the directory  
assigned for the basic spool.  
1. Delete the unnecessary files to provide more space  
to start printing job.  
2. If the previous printing error not solved.  
2. If there are some files with the extension name of  
****.jnl, Delete them and Reboot the Windows to  
restart printing job.  
3. When expected to collide with other program.  
3. Shut down all other programs except the current  
one, if possible.  
4. When an application program or the printer driver is  
damaged.  
4. Delete the printer driver completely and reinstall it.  
5. When some files related to OS are damaged or virus  
infected.  
5 After rebooting the computer, check for viruses,  
restore the damaged files and reinstall the program  
to do the printing job.  
6. Memory is less than suggested one.  
6. Add up enough memory to the PC.  
How to delete the data in the spool manager.  
In the spool manager, the installed drivers and the list of the documents waiting to be printed are shown.  
Select the document to be deleted and check the delete menu.  
If you intend to delete the current document being printed, the data being transferred to the printer will be put  
out and then the document is removed. Before choosing the document, the menu is still inactive.  
Or put the document out of the list and repeat the routine as in the above or finish the spool manager.  
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EXPLODED VIEW & PARTS LIST  
8. Exploded Views and Parts List  
8
5-1. Main Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page(5-2)  
5-2. Frame Unit Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . page(5-4)  
5-3. Drive Unit Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . page(5-7)  
5-4. Cassette Unit Assembly . . . . . . . . . . . . . . . . . . . . . . . . . page(5-8)  
5-5. Fuser Unit Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . page(5-10)  
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EXPLODED VIEW & PARTS LIST  
8.1 Main Assembly  
Service Manual  
8-2  
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EXPLODED VIEW & PARTS LIST  
Main Assembly Parts List  
SA : Service Available  
O : Service available X : Service not available  
No.  
Description  
SEC.Code  
Q’ty  
SA  
Remark  
0
1
2
ML-1710 / ML-1750  
ELA UNIT-FRAME LOWER, 110V  
MEA UNIT-COVER TOP  
MEA UNIT-COVER TOP  
MEA UNIT-COVER TOP  
MEA UNIT-COVER TOP  
LENS LED-M-LED  
COVER-M-TOP  
COVER-TOP  
COVER-TOP  
COVER-TOP  
JC96-02732A  
JC97-01748A  
JC97-01749A  
JC97-01748F  
JC97-01749N  
JC67-00026A  
JC63-00102A  
JC63-00102F  
JC63-00102T  
JC63-00102U  
JC63-00101A  
JC72-00973A  
*
JC72-01001A  
6107-001169  
JC64-00039A  
JC61-00606A  
JC39-00241A  
JC44-00046A  
JC59-00018A  
JC92-01439A  
JC63-00104A  
JC39-00242A  
JC96-02733A  
JC97-01746A  
JC63-00103A  
JC70-00302A  
JC70-00304A  
JC66-00387A  
JC70-00303A  
JC97-01750A  
JC92-01426A  
JC92-01424D  
JC39-00240A  
JC39-00240B  
JC31-00027A  
JC97-01793A  
JC66-00528A  
JC66-00395A  
JC72-00851A  
*
1
1
1
1
1
1
1
1
1
1
1
1
1
2
1
1
1
1
1
1
1
1
1
1
1
1
1
2
1
1
1
1
1
1
1
1
1
1
1
2
1
1
1
1
O
O
O
O
O
O
O
O
O
O
O
O
X
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
X
110V  
ML-1710/XAA  
ML-1750/XAA  
ML-1710/XAX  
ML-1750/XAX  
2-1  
2-2  
ML-1710/XAA  
ML-1750/XAA  
ML-1710/XAX  
ML-1750/XAX  
2-3  
2-4  
2-5  
2-6  
2-7  
2-8  
COVER-M-REAR  
PMO-STACKER_RX  
PMO-BUSHING_F/DOWN  
PMO-SUB STACKER  
SPRING-CS  
KEY-M-ON LINE  
3
4
5
6
7
8
9
PLATE-P-CHANNEL  
CBF HARNESS-MOTOR  
SMPS- V1(XAA)  
UNIT-HUMMINGBIRD LSU  
PBA MAIN-PANEL  
110V  
COVER PCB-M-PCB  
CBF HARNESS-LSU  
ELA UNIT-RX DRIVE  
MEA UNIT-COVER FRONT, USA  
COVER-M-FRONT  
ADJUST-M-MANUAL_L  
ADJUST RACK-M-MANUAL  
GEAR-RACK_PINION  
ADJUST-M-MANUAL_R  
MEA UNIT-CASSETTE, USA  
PBA MAIN-CONTROLLER GDI_1L  
PBA MAIN-CONTROLLER  
CBF HARNESS-ENGINE  
CBF HARNESS-ENGINE  
FAN-DC_HUMMINGBIRD  
MEA ETC-TR  
10  
11  
11-1  
11-2  
11-3  
11-4  
11-5  
12  
13  
ML-1710A  
ML-1750A  
ML-1710  
ML-1750  
14  
15  
16  
16-1  
16-2  
16-3  
ROLLER-TRANSFER ROLLER  
GEAR-TRANSFER  
PPR-SPACER_TR  
MEA UNIT-TONER CART_ DOM_1K  
CBF HARNESS-PANEL  
SHIELD-P-ENGINE  
17  
X
O
X
18  
19  
20  
JC39-00244A  
*
JC61-00601A  
BRACKET-P-INLET  
O
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EXPLODED VIEW & PARTS LIST  
8.2 Frame Unit Assembly  
Service Manual  
8-4  
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EXPLODED VIEW & PARTS LIST  
Frame Unit Assembly Parts List  
SA : Service Available  
O : Service available X : Service not available  
No.  
Description  
SEC.Code  
Q’ty  
SA  
Remark  
110V  
0
1
2
3
4
5
6
7
8
9
ELA UNIT-FRAME LOWER, 110V  
FRAME-M-BASE  
JC96-02732A  
*
1
1
1
1
1
1
2
1
4
2
4
4
4
4
3
1
1
2
1
1
2
1
1
1
1
1
1
1
1
5
1
1
1
1
1
1
1
1
1
1
1
2
2
1
1
1
1
1
1
O
X
GUIDE-P-TR  
PLATE-P-SAW  
GUIDE-M-TR RIB  
JC61-00607A  
JC61-00604A  
JC61-00594A  
*
O
O
O
X
GEAR-EXIT F/DOWN  
MEC-BEARING,EXIT  
ROLLER-EXIT F/DOWN  
SPRING-CS  
PMO-GEAR_EXIT_DRV16  
HOLDER-M-EXIT F/DOWN  
PMO-ROLLER_EXIT,MAIN  
PMO-ROLLER_EXIT,FR  
MEC-TERMINAL  
IPR-P-TERMINAL CON  
IPR-P-TERMINAL CR  
HOUSING-TERMINAL  
PMO-LOCKER CST  
PMO-ACTUATOR CVR OPEN  
PMO-PLATE GUIDE DEVE_R  
SPRING ETC-GUIDE DEVE  
IPR-P-GROUND_GUIDE PAPER  
PMO-PLATE GUIDE DEVE_L  
PMO-ACTUATOR FEED  
PMO-ACTUATOR EMPTY  
PMO-ACTUATOR MANUAL  
IPR-P-GROUND_EARTH TR  
SPRING-ETC  
*
X
JC66-00378A  
6107-001163  
*
JC61-00582A  
*
O
O
X
O
X
Spring Exit  
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
25  
26  
27  
28  
29  
30  
31  
32  
33  
34  
35  
36  
37  
38  
39  
40  
41  
42  
43  
44  
45  
46  
47  
48  
*
X
JC75-00049A  
JC70-00312A  
JC70-00313A  
JC61-00592A  
JC72-00983A  
JC72-00974A  
JC72-00985A  
*
JC70-00458A  
JC72-00984A  
JC72-00976A  
JC72-00975A  
JC72-00977A  
*
O
O
O
O
O
O
O
X
O
O
O
O
O
X
O
X
X
O
X
O
O
O
O
X
6107-001162  
*
ROLLER-FEED ROLLER 1  
PMO-BUSHING FEED  
ROLLER-FEED  
SPRING-TS  
IPR-P-EARTH TRANSFER  
HOLDER-PTL  
*
JC66-00598A  
*
Spring-act,Manual  
Spring-act,Feed  
JC70-00307A  
JC61-00583A  
JC67-00027A  
JC61-00588A  
*
LENS-PTL  
BUSH-M-TR L  
SPRING ETC-TR L HAWK  
SPRING-TS  
PMO-BUSHING_TR(L)  
IPR-P-GROUND_FUSER  
SHAFT-FEED IDLE  
BUSH-M-FEED IDLE  
SPRING ETC-TR  
IPR-P_GROUND_DRIVE2  
SPRING-TS  
*
X
JC72-00102A  
JC70-00310A  
JC66-00527A  
*
O
O
O
X
*
X
Spring Feed Idle  
JC70-00335A  
6107-001170  
JC66-00377A  
JC70-00308A  
JC33-00009A  
*
O
O
O
O
O
X
Spring-cam Pick-up  
CAM-M-PICK_UP  
IPR-P-GROUND_DRIVE  
SOLENOID-HB (PICK-UP)  
SOLENOID-HB (MANUAL)  
continue on the next page.  
Service Manual  
8-5  
Samsung Electronics  
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EXPLODED VIEW & PARTS LIST  
Frame Unit Assembly Parts List(Cont.)  
SA : Service Available  
O : Service available X : Service not available  
No.  
49  
49-1  
49-2  
49-3  
Description  
SEC.Code  
Q’ty  
SA  
Remark  
AS-GEAR PICK_UP  
PMO-GEAR PICK_UP B  
PMO-GEAR PICK_UP A  
SPRING-CS  
BRACKET-P-FEED  
IPR-P-GROUND_TR  
SHAFT-FEED  
JC81-01692A  
JC72-00980A  
JC72-00979A  
*
JC61-00602A  
JC70-00311A  
JC66-00398A  
*
JC66-00394A  
JC66-00396A  
JC61-00718A  
*
JC81-01693A  
*
1
1
1
1
1
1
2
3
1
1
1
2
1
1
1
2
2
1
1
1
1
1
1
1
1
1
4
1
O
O
O
X
O
O
O
X
O
O
O
X
O
X
Spring-Pick-up gear  
50  
51  
52  
53  
54  
55  
56  
57  
58  
RING-CS  
GEAR-FEED 2  
GEAR-IDLE 23  
GUIDE-P-PAPER  
RMO-RUBBER_FOOT  
AS-PICK UP  
58-1  
BUSH-M-PICK_UP L  
SHAFT-P-PICK_UP  
STOPPER-PICK_UP  
PMO-IDLE PICK_UP  
SPONGE-ROLLER PICK_UP  
BUSH-M-PICK_UP R  
HOUSING-M-PICK_UP  
MEA UNIT-CLUTCH  
GEAR-FEED 1  
PMO-COLLAR_SPRING  
SPRING-TS  
PMO-HUB CLUTCH  
AS-FUSER 110V  
58-2  
58-3  
58-4  
58-5  
58-6  
58-7  
*
*
X
X
JC72-00982A  
JC72-01231A  
JC61-00587A  
JC61-00591A  
JC97-01788A  
JC66-00393A  
JC72-00978A  
*
O
O
O
O
O
O
O
X
59  
59-1  
59-2  
59-3  
59-4  
60  
61  
62  
JC72-00981A  
JC81-01689A  
*
O
O
X
110V  
RMO-RUBBER EXIT  
PBA MAIN-PTL  
*
X
Service Manual  
8-6  
Samsung Electronics  
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EXPLODED VIEW & PARTS LIST  
8.3 Drive Unit Assembly  
0
7
6
8
1
9
HARNESS-MOTOR  
2
4
5
3
4
5
Drive Unit Assembly Parts List  
SA : Service Available  
O : Service available X : Service not available  
No.  
Description  
SEC.Code  
Q’ty  
SA  
Remark  
0
1
2
3
4
5
6
7
8
9
ELA UNIT-RX DRIVE  
BRACKET-P-GEAR 1400  
GEAR-RDCN 53/26  
GEAR-RDCN 113/33  
GEAR-RDCN 57/18  
RING-E  
BRACKET-P-MOTOR 1400  
GEAR-RDCN 103/41  
GEAR-RDCN 90/31  
MOTOR STEP-HUMMINGBIRD  
PMO-IMPELLER_DRV  
JC96-02733A  
1
1
1
1
2
2
1
1
1
1
1
O
X
X
X
X
X
X
O
O
O
X
*
*
*
*
*
*
JC66-00390A  
JC66-00392A  
JC31-00028A  
*
10  
Service Manual  
8-7  
Samsung Electronics  
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EXPLODED VIEW & PARTS LIST  
8.4 Cassette Unit Assembly  
0
12  
14  
13  
4
17  
3
16  
18  
5
6
7
2
5
8
10  
9
11  
1
15  
Service Manual  
8-8  
Samsung Electronics  
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Cassette Unit Assembly Parts List  
SA : Service Available  
O : Service available X : Service not available  
No.  
Description  
SEC.Code  
Q’ty  
SA  
Remark  
0
MEA UNIT-CASSETTE, USA  
FRAME-M-CASSETTE  
PMO-EXTENSION LARGE  
PMO-EXTENSION SMALL  
PLATE-P-KNOCK_UP  
SPRING-CS  
JC97-01750A  
1
1
1
1
1
2
1
1
2
2
1
1
1
1
1
1
1
1
3
O
X
O
O
X
X
X
X
X
X
X
X
O
O
X
O
O
X
X
1
*
2
JC72-00970A  
3
JC72-00971A  
4
*
5
*
6
HOLDER-M-PAD  
*
7
SPRING ETC-EXIT ROLL FD  
ROLLER-M-IDLE FEED  
SPRING-ES  
*
8
*
9
*
10  
11  
12  
13  
14  
15  
16  
17  
18  
PMO-PLATE_LOCKER  
SPRING ETC-LOCKER,PLATE  
ADJUST-M-CASSETTE_L  
ADJUST-M-CASSETTE_R  
GEAR-PINION  
*
*
JC70-00300A  
JC70-00301A  
*
INDICATOR-M-LEVER INDICATOR  
RPR-FRICTION PAD  
IPR-PLATE PAD  
JC64-00040A  
JC73-00140A  
*
*
RPR-PAD CASSETTE  
Service Manual  
8-9  
Samsung Electronics  
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EXPLODED VIEW & PARTS LIST  
8.5 Fuser Unit Assembly  
0
9
8
10  
7
6
33  
4
11  
5
3
2
12  
32  
1
32  
17  
13  
16  
15  
14  
18  
22  
19  
23  
20  
24  
21  
25  
31  
27  
30  
26  
29  
28  
Service Manual  
8-10  
Samsung Electronics  
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EXPLODED VIEW & PARTS LIST  
Fuser Unit Assembly Parts List  
SA : Service Available  
O : Service available X : Service not available  
No.  
Description  
AS-FUSER 110V  
SEC.Code  
Q’ty  
SA  
Remark  
110V  
O
JC81-01689A  
1
1
4
4
2
2
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
2
3
1
1
1
1
1
2
5
1
O
X
X
X
X
X
O
X
X
X
O
X
X
O
X
O
O
X
O
O
O
X
O
X
X
X
X
O
X
X
X
X
X
X
1
COVER-M-FUSER  
HOLDER-M-PLATE CLAW  
SPRING ETC-CLAW  
PMO-ROLLER EXIT  
SPRING ETC-FUSER EXIT  
THERMOSTAT-150  
PMO-GEAR_EXIT_DRV16  
GEAR-IDLE 23  
*
2
*
3
*
4
*
5
*
6
JC47-00005A  
7
*
8
*
9
RING-CS  
*
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
25  
26  
27  
28  
29  
30  
31  
32  
33  
GEAR-RDCN 25/15  
IPR-ELECTRODE_LAMP  
ELECTRODE-WIRE_L  
THERMISTOR-NTC  
ELECTRODE-WIRE_R  
CBF HARNESS-FUSER 110V  
GEAR-FUSER, Z37  
BUSH-M-HR L  
JC66-00397A  
*
*
1404-001298  
*
JC39-00239A  
White  
110V  
JC66-00564A  
*
ROLLER-HEAT  
JC66-00601A  
BUSH-M-HR R  
JC61-00590A  
LAMP-HALOGEN  
4713-001155  
ROLLER-M-EXIT F/UP  
ROLLER-PRESSURE  
BEARING-PRESSURE/R  
SPRING-CS  
*
JC66-00600A  
*
*
PMO-BUSHING TX  
HOLDER-ACTUATOR  
PMO-ACTUATOR_EXIT  
IPR-P-FRAME_FUSER  
GUIDE-M-INPUT  
*
*
JC72-00987A  
*
*
*
*
*
*
SPRING-TS  
RMO-RUBBER_EXIT  
NUT-HEXAGON  
LABEL(P)-CAUTION, HOT_FUSER  
Service Manual  
8-11  
Samsung Electronics  
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EXPLODED VIEW & PARTS LIST  
Service Manual  
8-12  
Samsung Electronics  
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BLOCK DIAGRAM  
9. Block Diagram  
9.1 PCL Model  
9
Service Manual  
9-1  
Samsung Electronics  
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BLOCK DIAGRAM  
9.2 SPL Model  
Service Manual  
9-2  
Samsung Electronics  
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CONNECTION DIAGRAM  
10. Connection Diagram  
10.1 PCL Model  
10  
LSUCLK  
1
2
3
4
5
6
7
8
1
2
3
4
5
1
2
3
4
5
POLYGON  
MOTOR  
nLREADY  
IEEE1284  
COMOPATIABLE  
nPMOTOR  
GND  
24VS  
38 PIN  
CABLE  
CN5  
*HSYNC  
5V  
37  
38  
CN9  
LSU  
GND  
LD  
nLD_ON  
VDO  
GND  
9
1 0  
1 1  
DIODE  
6
6 PIN  
HOST  
COMPUTER  
+3.3V  
PTL  
1
2
1
2
USB CABLE  
CN11  
PTL LED ARRAY  
CONNECTOR CN14  
for USB  
+24V  
MP_CLUTCH  
1
2
1
2
5
6
CN12  
CN6  
Manual Clutch  
Main Clutch  
+24V  
MAIN_CLUTCH  
1
2
1
2
PCL MAIN BOARD  
FR-4, 4LAYER  
P_EMPTY  
P_FEED  
1
2
1
4
3
6
5
8
7
10  
9
12  
11  
14  
13  
16  
15  
18  
17  
20  
19  
22  
21  
24  
23  
26  
25  
2
3
4
5
6
7
8
9
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
3.3V  
3.3V  
3.3V GND  
THER 1  
THER 2  
3.3V GND  
1
2
SMPS  
1
2
THERMISTOR  
CN8  
5V  
3.3V GND  
3.3V GND  
3.3V GND  
24VS  
A
1
1
2
3
B
A/  
B/  
24VS  
MP_EMPTY  
2
3
4
MOTOR  
CN10  
CN13  
24VS  
4
LED_READY  
THV_READ  
LED_ERROR  
THV_PWM  
THV_EN  
FAN  
PANEL  
BIAS_PWM  
HVPS  
MHV_PWM  
LED_TONER SAVE  
KEY_DEMO  
+3.3V  
23  
24  
25  
1
1
2
3
FAN  
FUSER  
P_EXIT  
DCU_DATA  
DCU_CLK  
GND  
2
3
4
DCU  
CN3  
26  
4
CN5  
Service Manual  
10-1  
Samsung Electronics  
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CONNECTION DIAGRAM  
10.2 SPL Model  
LSUCLK  
1
2
3
4
5
1
2
3
4
5
6
7
8
POLYGON  
MOTOR  
nLREADY  
nPMOTOR  
GND  
24VS  
HOST  
COMPUTER  
4PIN  
CONN-ECTOR  
USB CABLE  
for  
USB  
*HSYNC  
5V  
LSU  
1
2
3
4
5
CN6  
CN8  
GND  
nLD_ON  
VDO  
GND  
LD  
CN3  
9
1 0  
1 1  
DIODE  
6
+3.3V  
PTL  
1
2
1
2
PTL LED ARRAY  
+24V  
MP_CLUTCH  
1
2
1
2
CN9  
CN3  
Manual Clutch  
Main Clutch  
THE RM  
1
2
1
+24V  
MAIN_CLUTCH  
THE RM2  
THERMISTOR  
CN5  
2
1
2
1
2
A
1
2
1
A/  
B
SPL  
MAIN  
BOARD  
FR-4, 2Layer  
2
3
4
MOTOR  
P_EMPTY  
P_FEED  
3.3V  
3.3V  
3.3V GND  
CN7  
3
1
2
1
4
B/  
4
2
3
4
5
6
7
8
9
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
3
6
5
3.3V GND  
SMPS  
5V  
8
7
10  
3.3V GND  
3.3V GND  
3.3V GND  
24VS  
9
12  
11  
14  
13  
16  
24VS  
MP_EMPTY  
CN10  
CN5  
24VS  
LED_READY  
THV_READ  
LED_ERROR  
THV_PWM  
THV_EN  
15  
18  
17  
20  
19  
22  
FAN  
+3.3V  
1
1
2
3
D CU _D ATA  
2
3
4
_
CN2  
D CU C LK  
DCU  
PANEL  
BIAS_PWM  
GND  
HVPS  
4
MHV_PWM  
LED_TONER SAVE  
KEY_DEMO  
21  
24  
23  
26  
25  
23  
24  
25  
FAN  
FUSER  
P_EXIT  
26  
Service Manual  
10-2  
Samsung Electronics  
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SCHEMATIC DIAGRAMS  
11. Schematic Diagrams  
11.1 PCL Main Circuit Diagram (1/7)  
11  
Service Manual  
11-1  
Samsung Electronics  
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SCHEMATIC DIAGRAMS  
PCL Main Circuit Diagram (2/7)  
Service Manual  
11-2  
Samsung Electronics  
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SCHEMATIC DIAGRAMS  
PCL Main Circuit Diagram (3/7)  
Service Manual  
11-3  
Samsung Electronics  
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SCHEMATIC DIAGRAMS  
PCL Main Circuit Diagram (4/7)  
Service Manual  
11-4  
Samsung Electronics  
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SCHEMATIC DIAGRAMS  
PCL Main Circuit Diagram (5/7)  
Service Manual  
11-5  
Samsung Electronics  
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SCHEMATIC DIAGRAMS  
PCL Main Circuit Diagram (6/7)  
Service Manual  
11-6  
Samsung Electronics  
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SCHEMATIC DIAGRAMS  
PCL Main Circuit Diagram (7/7)  
Service Manual  
11-7  
Samsung Electronics  
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SCHEMATIC DIAGRAMS  
11.2 SPL Main Circuit Diagram (1/5)  
Service Manual  
11-8  
Samsung Electronics  
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SCHEMATIC DIAGRAMS  
SPL Main Circuit Diagram (2/5)  
Service Manual  
11-9  
Samsung Electronics  
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SCHEMATIC DIAGRAMS  
SPL Main Circuit Diagram (3/5)  
Service Manual  
11-10  
Samsung Electronics  
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SCHEMATIC DIAGRAMS  
SPL Main Circuit Diagram (4/5)  
Service Manual  
11-11  
Samsung Electronics  
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SCHEMATIC DIAGRAMS  
SPL Main Circuit Diagram (5/5)  
Service Manual  
11-12  
Samsung Electronics  
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SCHEMATIC DIAGRAMS  
11.3 HVPS Circuit Diagram (1/2)  
24VS  
5V  
5V  
C207  
103  
R202  
100  
R209  
100K  
C204  
103  
D201  
Q201  
A708-Y  
1N4148  
C206  
104  
CON2-16  
IT201  
R210  
5.6K  
C210  
6KV 221  
THV-PWM  
R201  
430  
4
THV-sen  
5
6
C211  
+
-
R208  
10K  
2 ¡  
7
Q202  
6
C945C-Y  
6KV 221  
U102-B  
KA324  
D204  
6KV  
D205  
D206  
6KV  
R204  
47K  
R205  
22K  
5
¡ 7  
D203  
D1NL20U  
1 ¡  
6KV  
THV  
50K  
THV  
R212  
Q203  
C2383  
6KV 221  
IT-01  
C201  
473  
C209  
C202  
102  
C203  
681  
R203  
C208  
681  
1/2W 100K  
2K  
R206  
180K-F  
R207  
C205  
330K-F  
ZD201  
2.7V  
D202  
473  
R211  
1/4W 4.7  
D1NL20U  
TNR201  
5N221K  
C212  
2KV 221  
TNR202  
5N431K  
R213  
MGR1/2W 100MF  
24VS  
TNR203  
5N431K  
5V  
C302  
103  
R302  
470K  
IT301  
C301  
104  
D302  
4KV  
R303  
470  
R309  
N.U  
4
2
C304  
R305  
¡
MGR1/2W 50M  
6
3KV 151  
R301  
1K  
5
¡ 7  
CON2-17  
THV-EA  
THV-sen  
Q301  
1 ¡  
IT-01  
C945C-Y  
D303  
1N4148  
R306  
150KF  
C303  
103  
Q302  
C2383  
473  
C306  
ZD301  
2.7V  
D301  
D1NL20U  
R304  
1/4W 4.7  
C305  
104  
D304  
1N4148  
R307  
150K  
INDEX  
50K  
5V  
D305  
1N4148  
R308  
1K  
3
2
+
-
CON2-18  
1
THV-READ  
U102-A  
KA324  
C307  
473  
Service Manual  
11-13  
Samsung Electronics  
Download from Www.Somanuals.com. All Manuals Search And Download.  
SCHEMATIC DIAGRAMS  
HVPS Circuit Diagram (2/2)  
5V  
24VS  
ZD401  
2.7V  
C404  
472  
R403  
1.5M  
D401  
1N4148  
C406  
103  
R407  
100K  
R406  
5.6K  
D404  
4KV  
Q401  
A708-Y  
MHV-sen  
R410  
1/2W 560K  
IT401  
MHV  
R413  
12  
13  
+
-
14  
4
R408  
470  
MHV-PWM  
1/2W 100K  
C405  
104  
R404  
10K  
2 ¡  
C409  
3KV 471  
U102-D  
KA324  
CON2-19 R401  
47K  
R402  
22K  
6
R411  
MGR1/2W 20MF  
C403  
331  
R414  
MGR1/2W 15MF  
5
¡ 7  
C401  
C402  
102  
D402  
1N4148  
R405  
10K  
473  
1 ¡  
MHV-sen  
IT-01  
C407  
103  
OPC  
Q403  
R412  
30KF  
5V  
C2316  
D403  
D1NL20U  
Q402  
C945C-Y  
ZD402  
2.7V  
C410  
221  
ZD403  
130V  
C408  
103  
R409  
1/4W 4.7  
MHV  
20K  
5V  
24VS  
ZD501  
2.7V  
C504  
472  
10  
R503  
D501  
1N4148  
C506  
103  
330KF  
R507  
R506  
5.6K  
100K  
Q501  
A708-Y  
D504  
4KV  
BIAS-sen  
IT501  
R510  
SUPPLY  
1/2W 1.8M  
R513  
+
-
4
8
BIAS-PWM  
CON2-20  
R508  
470  
1/2W 50K  
R502  
9
C505  
104  
R511  
R504  
10K  
2 ¡  
C510  
R501  
47K  
22K  
U102-C  
KA324  
6
C509  
3KV 471  
3KV 101  
ZD503  
200V  
7
5
¡
C501  
473  
C502  
102  
D502  
C503  
R505  
10K  
1 ¡  
1N4148 681  
BIAS-sen  
IT-01  
C507  
103  
DEV  
R514  
Q503  
C2316  
5V  
R512  
30KF  
1/2W 50K  
Q502  
C945C-Y  
D503  
D1NL20U  
R515  
MGR1/2W 15MF  
C508  
103  
R509  
1/4W 10  
ZD502  
2.7V  
DEV  
20K  
U103  
KA7805  
24VS  
5V  
IN  
OUT  
+
+
C113  
25V 47uF  
C112  
50V 10uF  
Service Manual  
11-14  
Samsung Electronics  
Download from Www.Somanuals.com. All Manuals Search And Download.  
SCHEMATIC DIAGRAMS  
11.4 SMPS Circuit Diagram : 110V (1/2)  
AR1  
DSS-601M  
Humming-V1 SMPS circuit diagram  
C3 C2  
472MAA  
SW1  
3024-P3T4DBKBK  
F1  
125V 8A  
F2  
125V 3A  
472MAA  
PT1  
EER2828V  
LF1  
0509V  
LF2  
0504V  
R14 R2  
D1,2,3,4  
C101  
1KV 102  
SW2  
SS-5GLD  
600V2A*4  
R5  
3W  
C6  
INLET1  
-
+
47K  
6
CON2-11,12,13  
+24VS 2.0A  
TVR1  
10D221K  
C4  
104  
9
C1  
224  
C5  
200V  
330uF  
C105  
D101,102  
200V 3A*2  
R1  
50V  
1uF  
C102  
35V  
R3  
5
1/2W  
560K  
TH1  
8
10D-13  
1000uF  
CON2-9,10  
GND  
R15  
D5  
UF4007  
1
R4  
CON2-8  
+5V 0.14A  
1
3
L1  
100uH  
10  
8
D104  
U105  
7805  
C103  
C104  
R11  
1W 47  
C10  
100V 1A  
16V  
25V  
100uF  
47uF  
630V  
333  
CON2-7  
GND  
CON1  
U2  
FUSIBLE  
VR1  
500  
B1  
PWM CONTROL  
D6  
2
R6  
100  
D103  
1
L101  
Drain  
40V 3A  
Vin  
U1  
F101  
250V2A  
1
4
STR-G6353  
200V1A  
BTA12-600B  
CON2-3,4  
+3.3V 1.0A  
5uH  
OCP/FB  
5
Source  
2
GND  
3
R109  
330  
R110  
430  
C11  
50V  
104  
R12  
1W 180  
FUSIBLE  
R13  
1/4W 100  
R111  
1.8K-F  
3
C106  
1KV 102  
PC101-B  
817M-B  
PC101-A  
817M-B  
PC102  
TLP3061F  
7
R8  
680  
R10  
47K  
C108  
50V 1uF  
C7  
35V  
22uF  
C109  
10V  
470uF  
4
C107  
16V  
1000uF  
R7  
6.8K  
R112  
5.6K-F  
1
11  
R9  
1W0.25  
U101  
TL431  
C8  
681  
R114  
1/2W  
1.5K  
GND  
CON2-5,6  
C13  
472MAA  
C12  
472MAA  
CON2-1(FEED-SEN)  
CON2-2(PAPER-EMPT)  
CON2-14(MANUAL)  
CON2-15(THV-READ)  
CON2-16(LED-READY)  
CON2-17(THV-PWM)  
CON2-11,12,13(+24VS)  
CON2-26(FUSER-ON)  
CON2-18(LED-ERROR)  
CON2-19(BIAS-PWM)  
CON2-20(THV-EA)  
Q102  
NO MARKING RESISTOR 1/8W-J(5%)  
C1008-Y  
CON2-21(LED TONER SAVE)  
CON2-22(MHV-PWM)  
CON2-23(FAN)  
CON2-24(KEY-DEMO)  
CON2-25(EXIT)  
CON2-26(FUSER-ON)  
Service Manual  
11-15  
Samsung Electronics  
Download from Www.Somanuals.com. All Manuals Search And Download.  
SCHEMATIC DIAGRAMS  
SMPS Circuit Diagram : 110V (2/2)  
3.3V  
3.3V  
R125 R126  
R127 R128  
R115 R116  
R117 R118  
CON2-2(PAPER EMPTY)  
CON2-1(FEED SENSOR)  
CON2-14(MANUAL)  
CON2-25(EXIT)  
1
3
4
1
2
3
1
2
3
4
1
2
3
OP104  
SG-288 2  
OP103  
KPI-512  
OP103  
KPI-512  
OP101  
KPI-512  
4
4
24VS  
CON3  
53015-0510  
3
2
1
D105  
1N4003  
TNR101  
7D561  
1
2
OPC1  
5268-03A  
CON2-16(LED-READY)  
CON2-18(LED-ERROR)  
CON2-21(LED-TONER SAVE)  
CON2-24(KEY-DEMO))  
R119  
2.2K  
3
4
5
CON2-23(FAN)  
Q101  
KSC1008-Y  
DGND  
R120  
5.6K  
CON4  
Service Manual  
11-16  
Samsung Electronics  
Download from Www.Somanuals.com. All Manuals Search And Download.  

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