Samsung Printer ML 1210 User Guide

LASER PRINTER  
ML-1200 Series  
ML-1210 / ML-1250 / ML-1220M  
Manual  
SERVICE  
LASER PRINTER  
CONTENTS  
1. Precautions  
2. Specifications  
3. Disassembly and Reassembly  
4. Troubleshooting  
5. Exploded Views and Parts List  
6. Block Diagram  
7. Connection Diagram  
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This manual is stated and  
provided for service description.  
All rights reserved. Any parts of the  
information in this manual are prohibited  
from free duplication, use or translation  
without prior written approval except in  
cases allowed by the Copyright Act.  
Specifications are subject to change without  
prior notice.  
Samsung Electronics Digital Printing CS Group  
Copyright (c) 2001. 5.  
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Precautions  
1. Precautions  
Please read the following carefully to prevent any accidents and not to damage the unit during service.  
1-1 Safety Precautions  
1. Safety Precautions  
LASER STATEMENT (LASERTURVALLISUUS)  
There are some electric or machinery parts with  
safety related property. If the parts replaced are dif-  
ferent from the original, the safety may not function.  
Even if the part could allow higher voltage than that  
of the part used, do not replace it and use a regular  
product clarified in specifications.  
WARNING : NEVER OPERATE AND SERVICE THE PRINTER  
WITH THE PROTECTIVE COVER REMOVED  
FROM LASER/SCANNER ASSEMBLY. THE  
REFLECTIVE BEAM, ALTHOUGH INVISIBLE, CAN  
DAMAGE YOUR EYES.  
Class 1 laser product  
2. Be careful not to leave a switch, a cover or a safety  
device out when reinstalling or assembling the prod-  
uct after repair.  
Luokan 1 laserlaite  
Klass 1 laser apparat  
Allonpituus 770-795nm  
Teho 0.3mW±0.03mW  
3. Replacing Precautions  
Do not change or add parts as you like. You cannot  
benefit from such a remodeled product at your will  
during the term of guarantee.  
INVISIBLE LASER RADIATION WHEN  
THIS COVER OPEN. DO NOT OPEN  
THIS COVER.  
CAUTION  
4. You must replace overheated or damaged parts or  
cords with regular products. Please solve the prob-  
lem causing any damage or overheating and troubles  
beforehand.  
UNSICHTBARE LASERSTRAHLUNG,  
WENN ABDECKUNG GEOFFNET.  
NIGHT DEM STRAHL AUSSETZEN.  
VORSICHT  
REYONNEMENT LASER INVISIBLE EN CAS  
D’OUVERTURE. EXPOSITION DANGERUSE AU  
FAISCEAU.  
ATTENTION  
RADIAZIONE LASER INVISIBLE IN CASO DI  
APERTURA. EVITARE L’ESPOSIZONE LA FASCIO.  
ATTENZIONE  
PRECAUCION  
Especially mind the safety on the part with  
this mark.  
You must use regular parts described in specifi-  
cations for the parts inflammable and where the  
current can be flown. Otherwise any hazard  
such as an electric shock or a fire could occur.  
REDIACION LASER INVISIBLE CUANDO SE  
ABRE. EVITAR EXPONERSE AL RAYO.  
CAUTION : Avoid exposure to invisible laser radiation when the  
development unit is not installed.  
1-2 Precautions on Disassembly and Reassembly  
Very careful precautions should be taken when replacing  
parts. Before replacing, please check cables because  
you cannot put the cables that you removed for replacing  
parts into the proper place if you would not make sure of  
where they were connected and in which condition.  
7. When disassembling, assembling, also observe small  
components are located in place.  
8. If you uncover and turn the machine over to replace  
some parts, toner or paper particles may contaminate  
the LSU window. Protect the LSU window with clean  
paper.  
Please do the following before disassembling for a repair  
or replacement of parts.  
Releasing Plastic Latches  
1. Pull out paper cassette, printer cartridge installed.  
Especially careful not to be scratched by the surface of  
developer or not to expose them to light.  
2. Turn the power switch off.  
3. Take out the power plug, printer cable from the printer.  
4. Use only the same type of part as original when replac-  
ing parts.  
5. Do not force to open or fasten plastic material compo-  
nents.  
6. Be careful that small parts such as screws should not  
get in the printer.  
Many of 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.  
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1-1  
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Precautions  
1-3 Tools for Troubleshooting  
The following tools are recommended for safe and smooth troubleshooting described in this service manual.  
DCU(Diagnostic Control Unit)  
Driver  
4
1Standard: Test equipment to diagnose the Laser  
Standard: "-" type, "+" type (M3 long, M3 short,  
M2 long, M2 short).  
printer supplied by Samsung Electronics.  
Pinset  
5
6
Standard: For general home use, small type.  
Cotton Swab  
Standard: For general home use, for medical ser-  
DVM(Digital Volt Meter)  
2Standard: Indicates more than 3 digits.  
vice.  
Ground  
Cleaning Equipments a IPA(Isopropyl  
7 Alcohol)dry cloth or a soft stuff neutral  
detergent.  
Software(Driver) installation CD ROM  
8
Electronic Scale  
3Standard: Equipment to check the weight of con-  
sumables(toner cartridge) supplied by Samsung  
Electronics. (The gram unit can be measured.)  
Mind your hands not to be touched when  
you disassemble and reassemble PBA ASS'Y,  
such as the main board, SMPS, HVPS.  
Note  
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1-2  
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Specifications  
2. Specifications  
ML-1210 (ML-1220M)  
ML-1250  
Engine  
Speed  
12ppm  
Resolution  
600 x 600 dpi  
1200 x 600 dpi  
FROP(Fist Power On Time)  
Warm-Up Time  
Power Consumption  
Dimension  
Under 12.5 sec  
30 sec  
25W (Print), 10W (Sleep)  
329 x 355 x 231 mm (13” x 14” x 9.1”)  
Max 6.5Kg (With Toner Cartridge)  
Weight  
Controller  
Processor  
Jupiter 366MHz  
61200 66MHz  
Memory  
8MB Equivalent  
SmartGDI  
4MB  
Emulation  
PCL6  
Interface  
IEEE1284, USB (ML-1220M : USB ONLY)  
OS Support  
Windows 95/98/2000/Me/NT,  
Linux(Radhat 6.0), iMac(Mac OS 8.0)  
N/W  
External  
Input  
150 sheets  
Paper  
Toner  
Output  
Manual  
Media Type  
100 sheets  
1 sheet  
A4, Letter. Legal, Executive, B5, A5, Folio,  
7 3/4(Monarch), #10, DL, C5, C6, B5  
Type  
Single Cartridge  
2,500 sheets  
2,500 (Initial : 1,000)  
60,000  
Life  
Cartridge  
Pick up Roller  
Feed Roller  
Transfer Roller  
Fuser  
60,000  
60,000  
40,000  
Key & LED  
LCD  
3Key, 4LEDs  
No  
User interface  
Toner Save  
Reprint  
YES  
YES  
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2-1  
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Disassembly and Reassembly  
3. Disassembly and Reassembly  
3-1 Cover Assembly  
3-1-1 Front Cover  
1. Pull the both side of the cover to open.  
4. Remove a screw of the front cover PCB and remove  
the connector, then remove the cover.  
2. Remove a screw and remove the stopper that holds  
the printer cover.  
3-1-2 Other Covers  
1. Before you remove other covers, you should remove the  
Front cover in advance.  
a
2. Rear Cover : Remove the cover in the direction of  
3. Top Cover : Remove the cover in the direction of  
.
.
b
c
4. Side Cover L, R : Remove the cover in the direction of  
.
3. Loosen the right lower part of the cover, then push the  
cover in the direction of arrow to loosen the left lower  
part.  
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3-1  
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Disassembly and Reassembly  
3-2 LED Panel PBA  
1. Before you remove other covers, you should remove.  
• Front Cover (see [3-1 Main Cover])  
3. Remove two screws, and remove LED panel.  
2. Remove two screws of PCB cover, and widen the  
hooks(  
) to remove.  
c
a
b
4. Remove PCB from the PCB cover.  
3-3 LSU(Laser Scanning Unit)  
1. Before you remove LSU, you should remove front  
cover, rear cover and top cover.  
3. Remove two connectors from the LSU, then remove  
the LSU.  
• Main Cover (see [3-1 Main Cover])  
2. Remove three screws securing the LSU.  
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3-2  
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Disassembly and Reassembly  
3-4 Transfer Roller  
1. Open the front cover.  
2. Use a proper tool("-" type screwdriver) to pull the one  
end of the roller slightly, then take it out.  
3-5 Motor Assembly  
1. Before you remove the motor assembly, you should  
remove:  
• Main Cover (see [3-1 Main Cover])  
• Shield Engine Assembly  
2. Remove five screws securing the motor assembly  
and remove a connector from engine board(Engine  
board and SMPS board are integrated), then take the  
motor assembly out.  
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3-3  
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Disassembly and Reassembly  
3-6 HVPS Board  
1. Before you remove HVPS board, you should remove:  
•Main Cover (see [3-1 Main Cover])  
2. Remove four screws and a connector from HVPS  
board, then take the board out.  
When you reassemble the HVPS board, make  
sure that five terminals should be put in place.  
Terminal  
Note  
3-7 Fuser Assembly  
1. Before remove fuser assembly, you should remove:  
• Main Cover (see [3-1 Main Cover])  
3. Remove two screws and unplug a fuser assembly  
harness. Then use a " - " screwdriver to unlatch the  
fuser assembly to remove.  
2. Remove two ground screws and a connector as illus-  
trated.  
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3-4  
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Disassembly and Reassembly  
3-8 Thermostat and Halogen Lamp  
1. Remove a screw from the fuser assembly and  
remove the thermostat cover, then remove two  
screws securing the thermostat.  
3. Take the halogen lamp out from the Heat Roller.  
When you reassemble the halogen lamp,  
handle it with care as it is fragile.  
Note  
2. Remove two screws from the fuser assembly, and  
take the Heat Roller out.  
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3-5  
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Disassembly and Reassembly  
3-9 SMPS Board  
1. Before you remove the SMPS board, you should  
remove:  
3. Unplug connectors from the main board and connec-  
tors from SMPS, then remove the SMPS. Remove  
four screws from SMPS and remove the SMPS  
board.  
• Main Cover (see [3-1 Main Cover])  
a
b
2. Remove screws in the order of  
the shield engine assembly.  
then remove  
a
The Engine board and SMPS board are  
integrated in a body.  
b
Note  
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3-6  
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Disassembly and Reassembly  
3-10 Main Board and Sensor Board  
1. Before you remove the main board, you should  
remove:  
3. Release four snap-fits securing the insulator engine  
board and then remove the insulator.  
• Main Cover (see [3-1 Main Cover])  
• SMPS board (see [3-9 SMPS Board])  
2. Remove two screws from the main board and unplug  
all of connectors, then remove the board.  
Main B’d  
4. Release four snap-fits securing the sensor board and  
then remove the sensor board.  
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3-7  
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Troubleshooting  
4. Troubleshooting  
4-1 How to use DCU  
4-4 The cause and solution of the malfunction  
4-1-1 DCU Setup......................................Page(4-2)  
4-1-2 Code ................................................Page(4-2)  
4-1-3 Self Diagnostic Mode......................Page(4-3)  
4-1-4 Self Test Button ................................Page(4-4)  
4-1-5 Paper Path Layout...........................Page(4-4)  
4-4-1 All LEDs blinking (Fuser Error)........Page(4-16)  
4-4-2 All LEDs blinking (SCAN ERROR) .Page(4-16)  
4-4-3 Not function of the gear of the fuser due to  
melting away.....................................Page(4-17)  
4-4-4 Paper Empty.....................................Page(4-17)  
4-4-5 Paper Empty without indication.......Page(4-17)  
4-4-6 Cover Open......................................Page(4-18)  
4-4-7 No lamp on when the cover is open  
4-2 The cause and solution of Bad image  
...........................................................Page(4-18)  
4-2-1 Vertical Black Line and Band ..........Page(4-5)  
4-2-2 Vertical White Line ...........................Page(4-5)  
4-2-3 Horizontal Black Band .....................Page(4-6)  
4-2-4 Black/White Spot..............................Page(4-6)  
4-2-5 Light Image.......................................Page(4-7)  
4-2-6 Dark Image or a Black.....................Page(4-7)  
4-2-7 Uneven Density................................Page(4-8)  
4-2-8 Background ......................................Page(4-8)  
4-2-9 Ghost (1)...........................................Page(4-9)  
4-2-10 Ghost (2)..........................................Page(4-9)  
4-2-11 Ghost (3)..........................................Page(4-10)  
4-2-12 Ghost (4) .........................................Page(4-10)  
4-2-13 Satins on the Face of Page............Page(4-10)  
4-2-14 Satins on Back of Page..................Page(4-11)  
4-2-15 Blank Page Print out (1) .................Page(4-11)  
4-2-16 Blank Page Print out (2) .................Page(4-11)  
4-4-8 Defective motor operation ...............Page(4-19)  
4-4-9 No Power..........................................Page(4-19)  
4-4-10 Vertical Line Getting Curved .........Page(4-20)  
4-5 Toner Cartridge Service  
4-5-1 Precautions on Safe-keeping of Toner Cartridge  
..........................................................Page(4-21)  
4-5-2 Service for the Life of Toner Cartridge  
..........................................................Page(4-21)  
4-5-3 Service for Judgement of Inferior Expendables  
and the Standard of Guarantee .....Page(4-21)  
4-5-4 Signs and Measures at Poor toner cartridge  
..........................................................Page(4-22)  
4-6 The cause and solutions of bad environment  
of the software  
4-6-1 The printer is not working (1)...........Page(4-25)  
4-6-2 The printer is not working (2) .........Page(4-26)  
4-6-3 Abnormal Printing.............................Page(4-27)  
4-6-4 SPOOL Error ...................................Page(4-28)  
4-3 The cause and solution of the bad discharge  
4-3-1 Wrong Print Position.......................Page(4-12)  
4-3-2 JAM 0...............................................Page(4-12)  
4-3-3 JAM 1...............................................Page(4-13)  
4-3-4 JAM 2...............................................Page(4-13)  
4-3-5 Multi-Feeding...................................Page(4-14)  
4-3-6 Paper rolled in the fuser .................Page(4-14)  
4-3-7 OPC.................................................Page(4-15)  
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4-1  
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Troubleshooting  
4-1 How to use DCU  
4-1-1 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 CN10(4 pin) of the Main control board.  
4-1-2 Code  
Connect DCU to the printer and turn the power on. It show 7 LED on the panel and each code tells the function of the  
printer.  
Normal Code  
While printing or warming up, it indicate the position of the paper  
61  
Warm up  
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  
20  
30  
40  
50  
69  
Print Start  
The engine controller received the print order from the video controller.  
The paper is passing out of the Feed Sensor.  
Feed Sensor On  
Feed Sensor off  
Paper Out  
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.  
Error Code  
When detecting the malfunction, the printing is stopped to indicate error code.  
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  
70  
71  
72  
73  
95  
Cover Open  
No Paper  
The Printer Cover is open or Toner Cartridge not installed.  
No paper in the paper cassette.  
Paper Jam 0  
Paper Jam 1  
Paper Jam 2  
LSU Not Ready  
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.  
The front part of paper is jammed just after passing through the discharge sensor.  
LSU Scanner Motor not ready or Hsync signal not output.  
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4-2  
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Troubleshooting  
4-1-3 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.  
00  
01  
02  
03  
04  
Main Motor Operating System  
Only the main motor is in operation.  
Main High Voltage On(THV-)  
-1550 voltage output by MHV terminal.  
Transfer High Voltage(-)On(THV-)  
Caution : High voltage probe should be used.  
-1300 voltage output by MHV terminal.  
Transfer High Voltage (+)Reference on (THV +)  
1300 voltage output by MHV terminal.  
DEV/supply High Voltage : DEV/Supply High Voltage Test.  
Caution  
:
High voltage probe should be used.  
Caution : High voltage probe should be used.  
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. Press the [Up] button to switch the voltage. The middle and right one of the three LEDs  
are on and -530 voltage output by DEV HV terminal.  
Caution : High voltage probe should be used.  
05  
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.  
06  
07  
Pickup clutch on  
The Solenoid in the printer is in operation. To stop the operation, Press the button [shift] and [Enter] together.  
Pempty/PWIDTH/New CRU Sensor Test : Pempty/PWIDTH.HEW CRU sensor test.  
If activate the Actuator of the PEMPTY/PWIDTH Sensor, the left and right of the three LEDs are on.  
If you install new toner Cartridge in this mode, the right LED is on.  
08  
09  
10  
Feed & Exit Sensor Test  
Test the Feed sensor and Discharge sensor in the same way as '06'.  
Cover Open Sensor Test  
The same way as code '06'.  
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.  
Cleaning Mode Print Mode  
Print the paper to clean the OPC Drum in the Cartridge.  
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4-3  
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Troubleshooting  
13.  
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. If no toner cartridge in the printer, output of THV is  
+199V ~ + 2100V.  
14.  
15.  
PTL Test  
Indicates the PTL LED.  
Fan Test  
Indicates the function of the fan.  
4-1-4 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.  
4-1-5 Paper Path Layout  
APER (150 SHEETS)  
APER (100 SHEETS)  
1
SHEET  
RECORDED  
P
RECORDED P  
MANUAL  
FACE DOWN  
LSU  
KNOCK UP  
EXIT 2  
PICK UP  
CARTRIDGE  
CR  
DR  
FUSER  
SR  
IDLE  
OPC  
H R/L  
FEED  
EMPTY SEN  
FACE UP  
TR  
FEED SEN  
PTL  
MAIN BOARD  
EXIT 1  
SENSOR BOARD  
Pr R/L  
EXIT SENSOR  
SMPS  
SHIELD  
SHIELD  
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4-4  
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Troubleshooting  
4-2 The cause and solution of Bad image  
4-2-1 Vertical Black Line and Band  
1. Straight thin black vertical line occurs in the printing.  
• Description  
2. Dark black vertical band occur in the printing.  
Check and Cause  
Solution  
Digital Printer  
Digital Printer  
Digital Printer  
Digital Printer  
1. Damaged develop roller in the Developer  
or deformed Doctor-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  
2. Replace the transfer roller if occurred as  
No. 3.  
Digital Printer  
in the developer, or heavily accumulated  
foreign matters between the discharge  
roller and fur transfer roller/ charge roller.  
3. Partly depression or deformation on the  
surface of the transfer roller.  
4-2-2 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.  
(In case the life of the developer has  
been expired, white lines occur in front of  
the image.)  
2. Foreign matter in the LSU : Open the  
cover of LSU and clean with a cotton  
swab on the surface of the reflex mirror.  
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.  
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, check to  
see if the weight of the developer is  
below 670g. If so, replace the developer  
cartridge.  
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Troubleshooting  
4-2-3 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 mm  
2. Clean the right Gear that has relatively  
small gap of the teeth in the OPC.  
Supply roller = 27 mm  
Develop roller = 32 mm  
Transfer roller = 47 mm  
3. If the malfunction persists, replace the  
developer.  
4-2-4 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 mm interval  
OPC drum : 75mm interval)  
2. If faded areas or voids occur in a black  
image at intervals of 75 mm, or black  
spots occur elsewhere, the OPC drum  
surface is damaged.  
2. In case of 75mm 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 50,000  
sheets printing. If the roller's life is expired,  
replace it.  
4. In case of 37mm interval unremovable in 1,  
take measures as to replace the developer  
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  
4-2-5 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. Wait 30 minutes after printer is powered on  
before you start printing.  
3. Bad contact caused by the toner stains  
between the high voltage terminal in the  
HVPS and the one in the set.  
4. Clean up the contaminated area by the  
toner.  
4. Abnormal output from the HVPS.  
(Run self-test and check 1~4)  
5. Replace the HVPS if the problems are not  
solved by the above four directions.  
( Service parts : Figure 11, Chapter 5)  
4-2-6 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  
4-2-7 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.  
4-2-8 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. Recycled recording paper has been  
used.  
1. B/S is not guaranteed when using recycled  
paper.  
2. The life of the Developer has expired.  
(The weight at the expiration of the  
developer's life: 800 ± 20g)  
2. Replace the Developer that has expired.  
3. Clean the busing part of the transfer roller.  
3. The up-to-down movement of the trans-  
fer roller is swift?  
4. The HVPS is normal?  
4. Replace the Developer if not solved by the  
above direction 1~3.  
(Perform DCU diagnostic code 01~04)  
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Troubleshooting  
4-2-9 Ghost (1)  
• Description  
Ghost occurs at 75 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.  
(Service Parts : Figure 9 , chapter 5)  
4. Transfer roller lifetime(50,000 sheets) has  
expired.  
4. If not solved by the direction 3, check the  
transfer roller lifetime and replace it.  
(Service Parts : Figure 8-2 , chapter 5)  
5. Abnormal low temperature(below 10°C).  
5. Wait about 1 hour after power on before  
using printer.  
4-2-10 Ghost (2)  
Ghost occurs at 75 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  
4-2-11 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  
4-2-12 Ghost (4)  
• Description  
Ghost occurs at 47mm 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)  
4-2-13 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  
4-2-14 Satins on Back of Page  
• Description  
The back of the page is stained at 47mm intervals.  
Check and Cause  
Solution  
Digita
Digital
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.  
4-2-15 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.  
4-2-16 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.  
(Service Parts : Figure 9 , chapter 5)  
4. Turn the power off, delete the data of PC  
and try printing again.  
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Troubleshooting  
4-3 The cause and solution of the bad discharge  
4-3-1 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  
(Service Parts : Figure 8-16 , chapter 5)  
4-3-2 JAM 0  
1. Paper is not exited from the cassette.  
2. Jam-0 occurs if the paper feeds into the printer.  
• Description  
Check and Cause  
Solution  
1. Check the Solenoid by using DCU  
diagnostic mode 06.  
1. Replace the solenoid. (Service Parts :  
Figure 8-11 , chapter 5)  
LSU  
EXIT  
2
PICK UP  
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.  
CARTRIDGE  
FEED SEN  
(Service Parts : Figure 8-13 , 8-14,  
chapter 5)  
EXIT  
1
EXIT SENSOR  
3. Check the surface of the roller-pick-  
up for foreign matter.  
JAM 0  
3. Clean with soft cloth dampened with  
IPA(Isopropyl Alcohol) or water.  
4. If continuous clusters occur, check  
whether the assembly slot between  
shaft-pickup and housing-pickup  
become open or is broken away.  
4. Replace the Housing-Pickup and/or  
Shaft-Pickup.  
(Service Parts : Figure 8-135, 8-12, chapter 5)  
5. If the paper feeds into the printer  
rand Jam 0 occurs, perform DCU to  
check feed-sensor of the sensor  
board.  
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Troubleshooting  
4-3-3 JAM 1  
1. Recording paper is jammed in front of or inside the fuser.  
Description  
2. Recording paper is stuck in the discharge roller and in the fuser just after passing through the  
Actuator-Feed.  
Check and Cause  
Solution  
1. If the recording paper is jammed in  
front of or inside the fuser.  
1. Replace the SMPS. (Service Parts :  
Figure 10, chapter 5)  
LSU  
(Perform DCU diagnostic code of)  
EXIT  
2
PICK UP  
FEED  
CARTRIDGE  
FEED SEN  
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 defec-  
tive.  
2. Reassemble the Actuator-Feed and  
Spring-Actuator if the returning is bad.  
EXIT  
1
EXIT SENSOR  
JAM 1  
4-3-4 JAM 2  
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.  
Description  
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).  
Check whether burrs occur in the  
assembly part of the actuator exit or  
not and if the actuator is smoothly  
operated.  
LSU  
After the paper is completely dis-  
charged, 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.  
EXIT  
2
PICK UP  
CARTRIDGE  
FEED SEN  
EXIT  
1
EXIT SENSOR  
JAM 2  
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.  
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 contami-  
nated with the toner.  
2. If the paper is stuck in the fuser : dis-  
assemble the fuser and remove the  
jammed paper, and clean the surface  
of the pressure roller with dry gauze.  
3. Paper is accordion in the fuser.  
3. Remove the jammed paper after disas-  
sembling the fuser : Clean the surface  
of the pressure roller with dry gauze.  
Remove the toner particles stained  
on the rib.  
Check the assemblage and perfor-  
mance of the exit.  
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Troubleshooting  
4-3-5 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 mode : solenoid check 06.  
1. Replace the solenoid if necessary.  
(Service Parts : Figure 13, chapter 5)  
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.  
4-3-6 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.  
(Background, Hot off set)  
1. Disassemble the fuser, clean the area between the  
Heat-roller and Thermistor and remove the foreign  
matter of the pressure roller.  
2. If background appears badly in the printing, fix it by  
referring to the solutions for background.  
(See 4-2-8 Background)  
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Troubleshooting  
4-3-7 OPC  
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 paper in the OPC.  
Remove the paper while turning the OPC against  
the ongoing direction.  
Clean fingerprints on the OPC softly with soft  
cloth dampened with IPA(Isopropyl Alcohol) or tis-  
sue.  
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Troubleshooting  
4-4 The cause and solution of the malfunction  
4-4-1 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.  
4. Check if the overheat circuit works properly.  
5. The fuser gear is defective due to melting away.  
4-4-2 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.  
(Service Parts : Figure 13, chapter 5)  
If you cannot solve the problem after you replace LSU,  
replace the main board.  
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Troubleshooting  
4-4-3 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.  
(Service Parts : Figure 8-4, Chapter 5)  
2. Replace the Main Control board.  
(Service Parts : Figure 9, Chapter 5)  
4-4-4 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.  
(Service Parts : Figure 8-17, Chapter 5)  
2. The function of the sensor board is defective Perform  
DCU mode: Perform DCU diagnostic code 8.  
2. Replace the sensor board.  
(Service Parts : Figure 8-10, Chapter 5)  
4-4-5 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.  
(Service Parts : Figure 8-17, chapter 5)  
2. The function of the sensor board is defective Perform.  
DCU mode : Perform DCU diagnostic code 8.  
2. Replace the sensor board.  
(Service Parts : Figure 8-10, chapter 5)  
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Troubleshooting  
4-4-6 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.  
(Service Parts : Figure 1, chapter 5)  
2. Check the connector 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 Sensor  
Connect.  
3. Replace the Main Control board or Cover Open  
Sensor.  
(Service Parts : Figure 9, chapter 5)  
Hook Lever  
4-4-7 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 Sensor  
Connect.  
2. Replace the Main Control board or Cover Open  
Sensor.  
(Service Parts : Figure 9, chapter 5)  
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Troubleshooting  
4-4-9 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.  
(Service Parts : Figure 12, chapter 5)  
2. Perform DCU diagnostic code 00 and Check the motor  
operation.  
2. Replace the SMPS, if necessary.  
(Service Parts : Figure 10, chapter 5)  
4-4-10 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.  
(Service Parts : Figure 10, chapter 5)  
2. Check the inferiority of LED-Panel on the front-cover if  
2. Replace the control board.  
the LED of Panel does not appear after normal warming-  
up.  
(Service Parts : Figure 9, chapter 5)  
3. Replace the LED-panel.  
(Service Parts : Figure 1-1, chapter 5)  
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Troubleshooting  
4-4-11 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.  
(Service Parts : Figure 13, chapter 5)  
2. Replace the Main Control board.  
(Service Parts : Figure 9, chapter 5)  
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Troubleshooting  
4-5 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.  
4-5-1 Precautions on Safe-keeping of Toner Cartridge  
Excessive exposure to direct light more than a few minutes may cause damage to the cartridge.  
4-5-2 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.  
4-5-3 Service for Judgement of Inferior Expendables and the Standard of Guarantee  
Please refer to User's Manual or Instructions on Fax/Printer Expendables SVC for the judgement of inferior expend-  
ables and the standard of guarantee besides this service manual.  
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Troubleshooting  
4-5-4 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  
(1)The weight of the developer  
ended: 800g ± 20g  
(The life is ended.)  
(2)If it become better by shaking,  
replace with a new developer  
after 50-100 sheets in the clos-  
ing state of the life span.  
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.  
2. In case of 2-  
Periodically a noise 2. Some part of image is not  
as "tick tick" occurs.  
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.)  
printed - Shake the develop-  
er and then recheck.  
(1)NG: Check the weight of the  
developer and 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.  
(2)Check the appearance of  
both ends of the developer  
OPC drum.  
1. If both ends of the OPC drum  
are contaminated with toner:  
Check the life of the developer.  
(In case of less than 820g, the  
life may be expired.)  
Contaminated with  
toner on prints part-  
ly or over the whole  
surface.  
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)35mm interval : Charged  
roller  
(2)75mm 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 75mm, or  
black spots occur elsewhere,  
the OPC drum is damaged 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 37mm - Replace  
the developer.  
: at intervals of 75mm - Remove  
foreign substance.  
: Broken image - Replace the  
developer according to care-  
lessness.  
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.  
Samsung Electronics  
4-23  
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Troubleshooting  
Fault  
Signs  
Cause & Check  
Solution  
Ghost & Image  
Contamination  
The printed image  
is too light or dark,  
or partially contami-  
nated black.  
1. The printed image is too light  
or dark, or partially contami-  
nated black.  
(1)Check whether foreign sub-  
stance or toner are stuck to  
the terminal(point of contact)  
of the developer.  
1. All of 1, 2, 3 above  
(1)Remove toner and foreign sub-  
stances adhered to the contact  
point of the developer.  
(2)The contact point of the unit  
facing that of the developer  
also must be cleaned.  
Totally contaminat-  
edblack.  
(Black image print-  
ed out)  
(2)Check whether the terminal  
assembly is normal.  
(3)If the terminal assembly is  
unsafe:  
Fully stick the terminal to or  
reassemble it after disassem-  
bling.  
Disassemble the side plate and  
push the terminal to be stuck,  
then reassemble it.  
The density of print-  
outs is too dark and  
ghost occurs.  
2. Totally contaminated black.  
(Black image printed out)  
(1)Check whether foreign sub-  
stances are stuck to the ter-  
minal(point of contact) of the  
developer and the state of  
assembly.  
2. In case of 2  
It is a phenomenon when the  
OPC drum of the developer is not  
electrically charged. Clean the  
terminals of the charged roller,  
then recheck it.  
(Especially check the  
charged roller terminal.)  
3. The printed image is dark and 3. In case of 3  
ghost occurs.  
It is a phenomenon as the devel-  
(1)Check foreign substance  
attached to the terminal  
(point of contact) of the  
developer and the state of  
assembly.  
oping bias voltage of the devel-  
oper. Clean the terminals of the  
developing roller, then recheck it.  
(Especially check the devel-  
oping roller terminal.)  
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4-24  
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Troubleshooting  
4-6 The cause and solutions of bad environment of the software  
4-6-1 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 4-5)  
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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4-25  
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Troubleshooting  
4-6-2 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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4-26  
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Troubleshooting  
4-6-3 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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4-27  
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Troubleshooting  
4-6-4 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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4-28  
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Exploded Views and Parts List  
5. Exploded Views and Parts List  
Deal drawings and service parts are declared for the items with higher rate  
of inferiority and replaceable in the level of service description only.  
• If inferiority occurs, you can replace the parts by the unit declared in deal  
drawings and service items.  
Way to observe Part Code & Description  
Part code and Description is quoted and controlled by determined standard. Refer to this determined  
standard, it will help with ordering Part.  
• There ar woo kinds of Part code inscription type.  
ex ) 2007-007961  
ex ) JB96-01268A  
R-CHIP  
ELA UNIT-COVER TOP  
Type 1 : Controlled by Company : It can be commonly used for all kinds of product SEC produce.  
Mostly, electronics Parts.  
Type 2 : Controlled by Division : It is used or one produce. Mostly, Mostly, mechanical Parts.  
• A/S privately used part : It is only used for A/S .  
• Ass’y part : Assembled by more than 2 Parts. If necessary part is not A/S Part, Ass’y part including  
necessary par can be used. It is shown in the diagram and drawing of SVC manual.  
• Ass’y part and A/S privately used Part is distinguished by part Code and Description.  
The are inscription type 2. It is recognized by Part character and front side of description.  
DIVISION  
A/S Private  
PART CODE  
**81-******  
DESCRIPTION  
AS-*****  
(JB81-00039A)  
(AS-USE)  
ASS’Y Part  
ASS’Y Part  
ASS’Y Part  
**75-******  
(JB75-00068A)  
MEC-*****  
(MEC-CHUTE)  
**92-******  
(JB92-01131A)  
PBA ******  
(PBA MAIN-CONTROLLER)  
**97-******  
MEA ******  
(JB97-01089A)  
(MEA UNIT-PULLEY IDLE)  
Samsung Electronics  
5-1  
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Exploded Views and Parts List  
5-1 Exploded Views and Parts List  
• Service Parts List  
O : Service available X : Service not available  
No.  
Description  
SEC.Code  
Q’ty SA  
Remark  
• PMO-COVER FRONT •  
1
ELA UNIT-CVR FRONT  
PBA SUB-LED PANEL  
PMO-COVER FRONT  
CBF HARNESS-FRONT PANEL  
PMO-COVER PCB  
PMO-GUIDE STACKER  
PMO-STOPPER  
PMO-COVER FRONT, SUB IMAC JC72-00843A  
PMO-STACKER RX  
PMO-STACKER RX  
PMO-COVER TOP  
PMO-COVER REAR  
PMO-COVER SIDE(L)  
PMO-COVER SIDE(R)  
MEC-TRAY(P)  
*
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
5
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
X
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
X
1-1  
JC92-01280A  
refer to the table  
JC39-00112C  
JC72-00678A  
JC72-00511A  
JC72-00519A  
ML-1210  
1-2  
1-3  
1-4  
1-5  
1-6  
1-7  
ML-1210/XAA  
JC72-00677A  
JC72-00677A  
JC72-00677F  
JC72-00677A  
JC72-00677A  
JC72-00677E  
JC72-00677A  
JC72-00677F  
JC72-00677A  
JC72-00677G  
JC72-00677A  
JC72-00677A  
JC72-00677V  
JC72-00677A  
ML-1210/XAC  
ML-1210/XAX  
ML-1210/XEG  
ML-1210/XEU  
ML-1210/XEF  
ML-1210/XET  
ML-1210/XEC  
ML-1210/XEO  
ML-1210/XIL  
ML-1210/XIP  
ML-1210/XSA  
ML-1210/XEV  
ML-1210/XEN  
ML-1220M ONLY  
ML-1210,1250  
ML-1220M  
2
JC72-00302A  
JC72-00302C  
JC72-00522A  
JC75-00094A  
JC72-00523A  
JC72-00524A  
JC75-00099A  
JC75-00099D  
*
3
4
5
6
7
ML-1210,1250  
ML-1220M  
MEC-TRAY(P)  
8
ELA UNIT-FR LOWER  
PMO-FRAME LOWER  
MEC-ROLLER_TRANSFER  
FAN-DC  
ELA HOU-FUSER ASS’Y  
ELA HOU-FUSER ASS’Y  
8-1  
JC72-00533A  
JC75-00129A  
3103-001085  
JC81-00424A  
JC81-00423A  
4713-001136  
4713-001135  
4712-000001  
JC75-00053A  
JC97-01486A  
JC72-00124A  
JC75-00056A  
JC75-00049A  
JC92-01197A  
JC33-00002B  
JC75-00072A  
JC75-00050B  
JC75-00051B  
JC72-00109A  
JC72-00130A  
JC72-00119A  
JC75-00111A  
JC96-01584A  
JC96-02037A  
JC72-00101A  
JC72-00102A  
JC61-00458A  
JC61-00024A  
JC72-00532A  
JC72-00534A  
JC72-40849A  
JC75-00054A  
JC75-00055A  
JC72-00100D  
JC92-01316D  
JC92-01333A  
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
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
8-2  
8-3  
8-4  
220V  
110V  
220V  
110V  
8-4-1 LAMP-HALOGEN  
LAMP-HALOGEN  
8-4-2 THERMOSTAT  
8-5  
8-6  
8-7  
8-8  
8-9  
ML-1250  
125 / 250V  
ML-1250/XAA  
ML-1250/XAC  
ML-1250/XEC  
ML-1250/XEG  
ML-1250/XEU  
ML-1250/XEF  
ML-1250/XET  
ML-1250/XIL  
ML-1250/XAX  
ML-1250/XIP  
ML-1250/XSA  
JC72-00677B  
JC72-00677B  
JC72-00677M  
JC72-00677B  
JC72-00677B  
JC72-00677L  
JC72-00677B  
JC72-00677N  
JC72-00677B  
JC72-00677M  
JC72-00677B  
MEC KNOCKUP-ASS’Y  
MEC UNIT HOLDER PAD  
PMO-CAP_PAD  
MEC GEAR-PICK UP  
MEC-TERMINAL  
PBA MAIN-SENSOR  
SOLENOID  
MEC-CAM PICK UP  
MEC-SIDE PAD(L)  
8-10  
8-11  
8-12  
8-13  
8-14  
8-15  
8-16  
8-17  
8-18  
8-19  
8-20  
8-21  
8-22  
8-23  
8-24  
8-25  
8-26  
8-27  
8-28  
8-29  
8-30  
MEC-SIDE PAD(R)  
PMO-HOUSING-PICK UP  
PMO-ACTUATOR-EXIT  
PMO-ACTUATOR-FEED  
MEC-PLATE UPPER  
ELA HOU-OPEN SENSOR  
ELA HOU-PTLASS’Y  
PMO-BUSHING_TR(R)  
PMO-BUSHING_TR(L)  
SPRING-TR, L  
SPRING-TR (300)  
PMO-HOLDER_EXIT  
PMO-COVER PTL  
PMO-BUSHING SHAFT  
MEC-ROLLER FEED  
EMC-HOLDER FEED  
PMO-HOLDER TR  
PBA MAIN-CONTROLLER GDI  
PBA MAIN-CONTROLLER PCL  
ML-1220M  
ML-1220M/XEU  
ML-1220M/XEF  
ML-1220M/XIL  
ML-1220M/AC  
JC72-00841A  
JC72-00841B  
JC72-00841C  
JC72-00841A  
9
ML-1210  
ML-1250  
ML-1220M  
220V  
110V  
ML-1210/1220M  
ML-1250  
PBA MAIN-ML-1220M IMAC(SUB) JC92-01316C  
10  
11  
12  
SMPS-ML-1210 V2  
SMPS-ML-1210 V1  
SMPS-HVPS  
JC44-00026A  
JC44-00025A  
JC44-00024A  
JC44-00036A  
JC96-02125A  
JC31-00005B  
JC59-00015A  
JC59-00015B  
SMPS-HVPS  
ELA UNIT-RX DRIVE  
MOTOR-STEP 7.5  
UNIT-LSU  
12-1  
13  
ML-1210/1220M  
ML-1250  
UNIT-LSU  
Samsung Electronics  
5-2  
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Exploded Views and Parts List  
5
2
1
/
M
0
2
3
0
1
2
2
1
-
1
-
L
L
M
M
7
13  
2
5
8
4
8-18  
1
9
8-26  
8-20  
11  
8-22  
8-23  
8-30  
1-5  
8-21  
8-24  
8-12  
10  
8-2  
1-2  
1-6  
8-13  
8-5  
8-14  
1-3  
8-9  
8-6  
8-15  
8-19  
8-7  
8-1  
1-1  
1-4  
8-11  
8-4  
8-8  
8-25  
8-17  
1-2’  
8-4-2  
1-2  
8-3  
8-27  
8-16  
8-29  
8-28  
8-4-1  
8-10  
6
12-1  
1-7  
12  
ML-1210 / ML-1250  
ML-1220M  
Samsung Electronics  
5-3  
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Exploded Views and Parts List  
5-2 Front Assembly  
0
SAMSUNG  
11  
3
2
5
ML-1210 / ML-1250  
10  
0’  
SAMSUNG  
4
10  
8
ML-1220M  
6
1
12  
9
7
NO  
DESCRIPTION  
0
ELA HOU-COVER FRONT  
ELA HOU-COVER FRONT  
CBF-HARNESS-PANEL MAIN  
PMO-COVER FRONT  
PMO-GUIDE STACKER  
PMO-DOOR FACE UP  
PPR-SHEET PAPER GUIDE  
PMO-KEY A  
1
2
3
4
5
6
7
PMO-KEY B  
8
PMO-LENS SED  
2’  
2
9
PMO-COVER PCB  
10  
11  
12  
13  
PMO-STOPPER  
PMO-BRKT PUSH DEVE  
PBA SUB DISP-PANEL  
PMO-COVER FRONT, SUB IMAC  
SAMSUNG  
13  
ML-1210 / ML-1250  
ML-1220M  
Samsung Electronics  
5-4  
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Exploded Views and Parts List  
5-3 Engine/Frame Lower Assembly  
2-17  
2-14  
2-13  
2-3  
3-2  
2-3-2  
2-12  
3-2-2  
3-2-3  
3-2-1  
2-11  
2-3-1  
3-2-4  
3-15  
3-43  
3-44  
2-15  
1
2-7  
3-12  
3-3  
3-3-1  
3-4  
3-2-3  
3-2-1  
2-7-3  
2-7-1  
2-7-2  
3-6  
3-5  
3-6  
2-10  
2-16  
2-16-2  
2-16-1  
3-17  
3
2-9  
2-9-1  
2-9-2  
3-10-2  
3-10-1  
3-10  
3-41  
2-9-3  
2-8  
3-45  
2-9-4  
3-25  
3-16  
3-9  
3-1  
2-1  
2-2  
3-24  
2-2-1  
2-2-3  
2-2-2  
2-6  
3-22  
3-23  
3-8  
3-7  
3-21  
3-26  
2-5  
3-19  
3-42  
3-11  
3-39  
3-13  
3-31  
3-32  
3-29  
3-34  
3-30  
2-4  
3-22  
3-23  
3-14  
3-26  
3-18  
3-21  
3-33  
3-20  
3-35  
3-28  
3-38  
3-36  
3-40  
3-27  
3-37  
3-46  
NO  
DESCRIPTION  
NO  
DESCRIPTION  
NO  
DESCRIPTION  
1
2
2-1  
2-2  
SMPS-HVPS  
2-16-1 TERMINAL  
2-16-2 SPRING-HV APOLLO  
3-17  
3-18  
3-19  
3-20  
3-21  
3-22  
3-23  
3-24  
3-25  
3-26  
3-27  
3-28  
3-29  
3-30  
3-31  
3-32  
3-33  
3-34  
3-35  
3-36  
3-37  
3-38  
3-39  
3-40  
3-41  
3-42  
3-43  
3-44  
3-45  
3-46  
IPR-GROUND_HVPS  
IPR-GROUND_FUSER  
IPR-GROUND_DRIVE  
CBF HARNESS-OPE GND  
PMO-HOLDER_PR  
ELA HOU-ENGINE ASSY  
SOLENOID-(APOLLO)  
MEC-GEAR PICKUP  
PMO-GEAR_PICKUP,1  
PMO-GEAR_PICKUP,2  
SPRING-PICKUP,GEAR  
MEC-CAM PICKUP  
PMO-CAM_PICKUP  
PMO-SHAFT_PICKUP  
PMO-GEAR_FEED  
PMO-CLUTCH_FEED  
SPRING-CLUTCH  
MEC-KNOCKUP ASSY  
PMO-PLATE_KNOCKUP  
PMO-CAM-KNOCKUP  
IPR-BAR_KNOCKUP  
SPRING-KNOCK UP  
MEC-HOLDER PAD  
PMO-HOLDER PAD  
PMO-HOLDER_PAD  
RPR-PAD FRICTION  
SPRING-PAD  
2-17  
S-1  
3
3-1  
3-2  
3-2-1  
PCT-INSULATOR ENG BD  
SCREW-TAPTITE  
ELA HOU-FRAME LOWER  
PMO-FRAME LOWER  
MEA ETC-HOLDER TR L  
PMO-HOLDER TR  
2-2-1  
2-2-2  
2-2-3  
BEARING-PRESSURE R  
SPRING-PR  
2-3  
MEC-ROLLER_PRESSURE  
PMO-GUIDE_INPUT  
RMO-RUBBER_FOOT  
ELA HOU-FUSER ASSY220V  
CBF-HARNESS FUSER  
ELA HOU-MOTOR GND  
PMO-BUSHING SHAFT  
FAN-DC  
2-3-1  
2-3-2  
3-2-2  
3-2-3  
3-2-4  
PMO-BUSHING_TR(L)  
SPRING-TR  
IPR-PLATE_TR  
2-4  
2-5  
2-6  
2-7  
3-3  
MEA ETC-HOLDER TR R  
PMO-HOLDER TR  
PMO-BUSHING_TR(R)  
SPRING-TR  
3-2-1  
3-3-1  
3-2-3  
2-7-1  
2-7-2  
2-7-3  
3-4  
PMO-CAP PLTE GU/DEV R  
PMO-CAP PLTE GU/DEV L  
SPRING-GUIDE DEVE  
PMO-ACTUATOR_EXIT  
PMO-HOLDER_EXIT  
PMO-BUSHING_TERMINAL  
ELA HOU-OPEN SENSOR  
PMO-GEAR_83/35  
3-5  
3-6  
3-7  
3-8  
3-9  
3-10  
SPRING-FUSER DR  
PMO-GEAR_FU_IN 47  
PMO-GEAR_FU_OUT 47  
MEC-ROLLER FEED  
PBA MAIN-SENSOR  
EMC-HOLDER FEED  
CBF HARNESS-MOTOR GND  
IRP-BRKT FUSER DRV  
PMO-HINGE FRONT(L)  
PMO-HINGE FRONT(R)  
PMO-COVER PTL  
2-8  
2-9  
2-9-1  
2-9-2  
2-9-3  
2-9-4  
3-10-1 IPR-BRKT_SENSOR  
3-10-2 CBF-HARNESS COVER  
2-10  
PMO-CAP_PAD  
MEC-SIDE PAD(R)  
MEC-SIDE PAD(L)  
PMO-GEAR_TRANSFER  
PPR-SPACER DR  
2-11  
2-12  
2-13  
2-14  
2-15  
2-16  
3-11  
IPR-GUIDE-TR  
3-12  
3-13  
3-14  
3-15  
3-16  
IPR-PLATE-TERMINAL  
IPR-SAW_PLATE  
PCT-FILM SAW  
IPR-EARTH_TRANS  
IPR-GROUND_GUIDE  
ELA HOU-PTL  
PCT-COVER SHEET LAMP  
PCT-INSULATOR SENSOR BD  
MEC-TRANSFER ROLLER  
MEC-TERMINAL  
Samsung Electronics  
5-5  
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Exploded Views and Parts List  
5-4 Fuser Assembly  
24  
30  
29  
27  
26  
28  
24  
23  
25  
17  
21  
0
NO  
0
DESCRIPTION  
ELA HOU-FUSER ASSY  
THERMISTOR-NTC  
1
2
THERMOSTAT-150C  
LAMP-HALOGEN  
3
7
2
4
PMO-COVER FUSER  
PMO-BUSHING H/R, L  
PMO-BUSHING H/R, R  
PMO-COVER_THERMOSTAT  
NPR-ROLLER HEAT  
IPR-ELECTRODE_PLATE  
IPR-GROUND_FU  
S-1  
13  
9
5
6
12  
7
20  
8
9
10  
11  
12  
13  
14  
PMO-GUIDE CLAW  
15  
15-2  
15-1  
ELECTRODE-WIRE,1  
ELECTRODE-WIRE,S  
MEA ETC-SHAFT EXIT  
PMO-SHAFT_EXIT(Z15)  
RMO-RUBBER_EXIT  
PMO-ROLLER_IDLE EXIT  
IPR-PIN ROLLER EXIT  
SPRING-EXIT  
4
16  
18  
1
S-2  
14-1  
14-1  
14-2  
15  
15-1  
16  
17  
14-2  
22  
10  
11  
17  
18  
19  
20  
21  
22  
23  
24  
25  
26  
27  
28  
29  
30  
S-1  
S-2  
PMO-GEAR_EXIT_DRV16  
PMO-GEAR_EXIT_IDLE  
PMO-GEAR_FUSER  
LABEL (R)-CAU_HOT_FU  
SPRING-EXIT DOWN  
SPRING-ES, GUIDE CLAW  
GEAR-EXIT F/DOWN  
BEARING-EXIT FU L  
PMO-COVER FUSER F/DOWN  
PMO-HOLDER_EXIT_DOWN  
PMO-EXIT_DOWN_L  
PMO-EXIT_DOWN_S  
RMO-RUBBER-KICKER  
MEC-UNIT_EXIT, F_DOWN  
SCREW TAPTITE  
14  
S-1  
5
3
S-1  
8
19  
6
SCREW TAPTITE  
Samsung Electronics  
5-6  
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Exploded Views and Parts List  
5-5 Shield Engine Unit Assembly  
NO  
0
DESCRIPTION  
ELA HOU-SHIELD ENGINE  
MEC-SHIELD BRKT CONTROLLER  
IPR-SHIELD ENGINE  
IPR-BRKT CONTROLLER  
PCT-INSULATOR SMPS  
CBF HARNESS-INLET ASSY  
SCREW-MACHINE  
1
1-1  
1-2  
0
2
3
S-1  
S-2  
S-3  
SCREW-TAPTITE  
SCREW-TAPTITE  
2
1
S-1  
3
S-3  
S-2  
1-1  
1-2  
Samsung Electronics  
5-7  
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Exploded Views and Parts List  
5-6 RX Drive Assembly  
NO  
0
DESCRIPTION  
ELA HOU-RX DRIVE  
MOTOR-STEP  
0
1
2
PMO-GEAR_71/28  
PMO-GEAR_73/22  
PMO-GEAR_132/19  
IPR-BRKT_MOTOR  
IPR-BRKT_GEAR  
CBF-HARNESS_MOTOR  
SCREW-MACHINE  
3
4
7
5
4
5
6
7
6
S-7  
1
2
3
S-7  
S-7  
5-7 Plate-Upper Unit Assembly  
NO  
0
DESCRIPTION  
MEC-PLATE UPPER  
IPR-UPPER-PLATE  
1
2
IPR-PLATE SPRING DEV  
MEA ETC-ROLLER PICKUP  
PMO-HOUSING_PICKUP  
RMO-ROLLER_PICKUP  
PMO-IDLE_PICKUP  
MEA ETC-IDLE FEED  
PMO-HOLDER_PICKUP  
SPRING-FEED  
3
0
6
3-1  
3-2  
3-3  
4
4-1  
4-2  
4-3  
PMO-HOLDER_IDLE,FEED  
ICT-ROLLER_IDLE,FEED  
CABLE CLAMP  
5
6
S-1  
S-9  
SCREW TAPTITE  
SCREW TAPTITE  
4
1
3-3  
4-1  
4-2  
4-3  
3-2  
3
4
3-1  
4-1  
3-3  
2
4-2  
4-3  
2
5
Samsung Electronics  
5-8  
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Block Diagram  
6. Block Diagram  
6-1. Block Diagram(GDI)  
MAIN  
POWER  
SWI TCH  
+5V  
POWER  
CORD  
USB  
SMPS  
74LVX161284  
+24V  
FLASH  
MEMORY  
(0 .5MB)  
Line  
PC  
I N-LET  
IEEE 1284 CABLE  
EXI T  
Transc ei v er  
N
SE SOR  
MOTOR  
SDRAM  
(8MB)  
Power  
On  
Eng i ne  
SOLENOIDE  
Re s e t  
VOLTAGE  
FAN  
DETECT OR  
C P U  
DEV_FUSE  
Jupiter3  
Crystal  
10MHz  
S3C46M0X  
Mai n  
Clock  
LSU  
FS781BZB  
Vi deo  
Clock  
PANEL  
B' D  
Osci l lator  
44 MHz  
4 LED  
MHV  
MHVPWM  
BI ASPW M  
THVPWM  
OPC GND  
SUPPLY  
3
KEY  
BUFFER  
HVPS  
B' D  
DEV  
TH V  
Samsung Electronics  
6-1  
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Block Diagram  
6-2. Block Diagram(PCL)  
MAIN  
Oscillator  
48 MHz  
POWER  
SWITCH  
+5V  
POWER  
CORD  
USB  
SMPS  
+24V  
USB Driver  
USBN9602-28M  
FLASH  
MEMORY  
(2MB)  
IN-LET  
PC  
IEEE 1284 CABLE  
EXIT  
N
SE SOR  
MOTOR  
SDRAM  
( 4MB)  
Power  
On  
Reset  
SOLENOID  
Eng i ne  
VOLTAGE  
DETECTOR  
Option  
Up to  
FAN  
DEV_FUSE  
68MB  
C P U  
Main  
74HCT273  
74ACT273  
S3C46C0X01  
Clock  
Oscillator  
20 MHz  
LSU  
Devided by  
74HC406ON  
Video  
Clock  
PANEL  
B' D  
Oscillator  
44 MHz  
Crystal  
6.7149 MHz  
4 LED  
MHV  
OPC GND  
SUPPLY  
3
KEY  
MHVPWM  
HVPS  
B' D  
BI ASPW M  
THVPWM  
DEV  
TH V  
Samsung Electronics  
6-2  
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Connection Diagram  
7. Connection Diagram  
7-1. Connection Diagram(GDI)  
+24V_T  
+24V GND  
*PMOTOR  
+3. 3V  
EXT_CLK  
* HSYNC  
+5V  
+5V GND  
* LD_ON  
VDO  
+5V GND  
1
2
1
2
3
4
5
IEEE1284  
COMPATI ABLE  
CABLE  
POLYGON  
MOTOR  
3
4
5
36  
PI N  
J1  
LSU  
6
1
CN9  
7
2
8
3
4
5
6
LD DIODE  
9
10  
11  
4PI N  
HOST  
+5V  
+5V GND  
LED_ERROR  
LED_PAPER  
LED_DATA  
LED_TONER  
* KEY_TONER  
* KEY_CANCEL  
USB CABLE  
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
CONN-  
CN3  
ECTO R  
f or  
COMPUTER  
LED  
USB  
CN13  
DISPLAY  
PANEL  
* KEY_DEMO  
+5V  
1
1
2
3
4
DCU_DATA  
DCU_CLK  
+5V GND  
2
DCU  
1
CN  
3
4
+5V  
PTL  
1
2
1
2
GDICN6  
Main  
PTL LED ARRAY  
+5V  
*P EMPT Y  
* FEED  
+5V GND  
1
1
SENSOR  
BOARD  
2
3
4
2
3
4
CN7  
Board  
G
+5V ND  
+5V  
+5V GND  
+5V  
+5V GND  
+5V  
1
2
1
2
3
3
4
4
5
5
6
6
+24V GND  
+24V  
+24V GND  
+24V  
+24V GND  
+24V  
EXIT  
+24VS  
FUSER ON  
+24VS  
* EGMOT_B1  
CLUTCH  
EGMOT_PHB  
FA N  
DEV_FUSE  
EGMOT _A1  
* NEW_DEVE  
EGMOT PHA  
7
7
8
9
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
FUSER  
8
9
CN502  
CN1  
+24V  
Not Used  
+24VS  
SMPS  
1
2
3
1
2
3
COVER  
SW ITCH  
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
CN11  
CN12  
CN5  
CN5  
THERM_A  
THERM_B  
1
2
1
2
THERMI STOR  
SOL E-  
NOID  
+24V_T  
+24V GND  
THV PWM  
*THV_EA  
THVRE AD  
* M HVPWM  
BI ASPW M  
+5V  
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
ST EP-  
PING  
ENGINE  
N
C 2  
*
M
O
TO R  
CN8  
_
HV PS  
DEV_FUS E  
FAN  
CN3  
CN4  
+5V GND  
ENGI NE + SMPS  
Unification  
B'd  
Samsung Electronics  
7-1  
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Connection Diagram  
7-2. Connection Diagram(PCL)  
+24V_SLEEP  
1
2
1
2
3
4
5
+24V GND  
PMOTOR *  
LREADY*  
EXT_CLK  
HSYNC*  
+5V  
+5V GND  
LD_ON*  
VDO  
IEEE1284  
COMPATI ABLE  
CABLE  
POLYGON  
MOTOR  
3
4
5
36  
PI N  
J1  
LSU  
6
1
CN12  
7
2
8
3
4
5
6
LD DIODE  
9
10  
11  
+5V GND  
4PI N  
HOST  
+5V  
+5V GND  
USB CABLE  
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
CONN-  
CN7  
ECTO R  
f or  
COMPUTER  
LED_ERROR  
LED_PAPER  
LED_DATA  
LED_TONER  
KEY_TONER*  
KEY_CANCEL*  
KEY_DEMO*  
LED  
USB  
CN5  
CN4  
DISPLAY  
PANEL  
+5V  
1
1
2
3
4
DCU_DATA  
DCU_CLK  
+5V GND  
2
DCU  
9
CN  
3
4
+5V  
PTL  
1
2
1
2
PTL LED ARRAY  
PCL  
Main  
Board  
+5V  
PEMPTY*  
FEED_SENSOR*  
+5V GND  
1
1
SENSOR  
BOARD  
2
3
4
2
3
4
CN6  
+5V GND  
+5V  
+5V GND  
+5V  
+5V GND  
+5V  
+24V GND  
+24V  
+24V GND  
+24V  
+24V GND  
+24V  
EXIT  
+24VS  
FUSER ON  
+24VS  
MOTOR B*  
CLUTCH  
MOTOR_PB  
FAN  
DEV_FUSE  
MOTOR_A*  
NEW_DVE*  
MOTOR_PA  
1
2
1
2
3
3
4
4
5
5
6
6
7
7
8
9
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
FUSER  
8
9
CN502  
CN1  
+24V  
Not Used  
+24VS  
SMPS  
1
2
3
1
2
3
COVER  
SW ITCH  
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
CN8  
CN3  
CN5  
THERM_A  
THERM_B  
1
2
1
2
CN11  
CN2  
THERMI STOR  
SOL E-  
NOID  
+24V_SLEEP  
+24V GND  
THV PWM  
THV_EN*  
THVRE AD  
M HVPWM*  
BI ASPW M  
+5V  
1
2
3
4
5
6
7
8
9
1
2
ST EP-  
PING  
ENGINE  
N
C 2  
3
4
5
6
7
8
9
M
O
TO R  
HV PS  
DEV_FUS E  
FAN  
CN3  
CN4  
+5V GND  
ENGI NE + SMPS  
Unification  
B'd  
Samsung Electronics  
7-2  
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Repair Manual  
LASER PRINTER  
ML-1200 Series  
CONTENTS  
1. Block Diagram  
2. Connection Diagram  
3. Schematic Diagrams  
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BLOCK DIAGRAM  
1. Block Diagram  
1.1 GDI Block Diagram(ML-1210/ML-1220M)  
1
Repair Manual  
1-1  
Samsung Electronics  
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BLOCK DIAGRAM  
1.2 PCL Block Diagram(ML-1250)  
Repair Manual  
1-2  
Samsung Electronics  
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CONNECTION DIAGRAM  
2. Connection Diagram  
2.1 GDI Connection Diagram(ML-1210/ML-1220M)  
2
+24V_T  
+24V GND  
*PMOTOR  
+3. 3V  
EXT_CLK  
* HSYNC  
+5V  
+5V GND  
* LD_ON  
VDO  
+5V GND  
1
2
3
4
5
6
7
8
1
2
3
4
5
1
2
3
4
5
IEEE1284  
COMPATI ABLE  
CABLE  
POLYGON  
MOTOR  
36  
PI N  
J1  
LSU  
CN9  
LD DIODE  
9
10  
11  
6
4PI N  
HOST  
USB CABLE  
+5V  
+5V GND  
LED_ERROR  
LED_PAPER  
LED_DATA  
LED_TONER  
* KEY_TONER  
* KEY_CANCEL  
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
CONN-  
ECTO R  
f or  
USB  
CN3  
COMPUTER  
LED  
CN13  
DISPLAY  
PANEL  
* KEY_DEMO  
+5V  
1
1
2
3
4
DCU_DATA  
DCU_CLK  
+5V GND  
2
DCU  
1
CN  
3
4
+5V  
PTL  
1
2
1
2
GDICN6  
Main  
PTL LED ARRAY  
+5V  
*P EMPT Y  
* FEED  
+5V GND  
1
1
SENSOR  
BOARD  
2
3
4
2
CN7  
Board  
G
+5V ND  
+5V  
+5V GND  
+5V  
+5V GND  
+5V  
1
1
3
4
2
3
4
5
6
7
2
3
4
5
6
7
+24V GND  
+24V  
+24V GND  
+24V  
+24V GND  
+24V  
EXIT  
+24VS  
FUSER ON  
+24VS  
* EGMOT_B1  
CLUTCH  
EGMOT_PHB  
FA N  
DEV_FUSE  
EGMOT _A1  
* NEW_DEVE  
EGMOT PHA  
FUSER  
CN502  
8
8
+24V  
Not Used  
+24VS  
SMPS  
CN5  
1
2
3
1
2
3
9
9
COVER  
SW ITCH  
10  
10  
CN11  
CN12  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
11  
12  
13  
14  
15  
16  
CN5  
THERM_A  
THERM_B  
1
2
1
2
THERMI STOR  
17  
SOL E-  
NOID  
CN1  
18  
19  
20  
21  
22  
23  
+24V_T  
+24V GND  
THV PWM  
*THV_EA  
THVRE AD  
* M HVPWM  
BI ASPW M  
+5V  
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
ST EP-  
ENGINE  
PING  
N
C 2  
*
M
O
TO R  
CN8  
23  
24  
_
HV PS  
DEV_FUS E  
FAN  
24  
CN3  
CN4  
+5V GND  
9
9
ENGI NE + SMPS  
Unification  
B'd  
Repair Manual  
2-1  
Samsung Electronics  
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CONNECTION DIAGRAM  
2-2 PCL Connection Diagram(ML-1250)  
+24V_SLEEP  
1
2
3
4
5
1
2
+24V GND  
PMOTOR *  
LREADY*  
EXT_CLK  
HSYNC*  
+5V  
+5V GND  
LD_ON*  
VDO  
IEEE1284  
COMPATI ABLE  
CABLE  
POLYGON  
MOTOR  
3
4
5
36  
PI N  
J1  
LSU  
1
6
CN12  
2
7
8
3
4
5
6
LD DIODE  
9
10  
11  
+5V GND  
4PI N  
HOST  
USB CABLE  
+5V  
+5V GND  
LED_ERROR  
LED_PAPER  
LED_DATA  
LED_TONER  
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
CONN-  
ECTO R  
f or  
CN7  
COMPUTER  
LED  
USB  
CN5  
CN4  
DISPLAY  
PANEL  
KEY_TONER*  
KEY_CANCEL*  
KEY_DEMO*  
+5V  
1
1
2
3
4
DCU_DATA  
DCU_CLK  
+5V GND  
2
DCU  
9
CN  
3
4
+5V  
PTL  
1
2
1
2
PTL LED ARRAY  
PCL  
Main  
Board  
+5V  
PEMPTY*  
FEED_SENSOR*  
+5V GND  
1
1
SENSOR  
BOARD  
2
3
4
2
3
4
CN6  
+5V GND  
+5V  
+5V GND  
+5V  
+5V GND  
+5V  
+24V GND  
+24V  
+24V GND  
+24V  
+24V GND  
+24V  
EXIT  
+24VS  
FUSER ON  
+24VS  
MOTOR B*  
CLUTCH  
MOTOR_PB  
FAN  
DEV_FUSE  
MOTOR_A*  
NEW_DVE*  
MOTOR_PA  
1
2
1
2
3
3
4
4
5
5
6
6
7
7
8
9
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
FUSER  
8
9
CN502  
CN1  
+24V  
Not Used  
+24VS  
SMPS  
1
2
3
1
2
3
COVER  
SW ITCH  
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
CN8  
CN3  
CN5  
THERM_A  
THERM_B  
1
2
1
2
CN11  
CN2  
THERMI STOR  
SOL E-  
NOID  
+24V_SLEEP  
+24V GND  
THV PWM  
THV_EN*  
THVRE AD  
M HVPWM*  
BI ASPW M  
+5V  
1
2
3
4
5
6
7
8
9
1
2
STEP-  
PING  
ENGINE  
N
C 2  
3
4
5
6
7
8
9
M
O
TO R  
HV PS  
DEV_FUS E  
FAN  
CN3  
CN4  
+5V GND  
ENGI NE + SMPS  
Unification  
B'd  
Repair Manual  
2-2  
Samsung Electronics  
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SCHEMATIC DIAGRAMS  
3. Schematic Diagrams  
3.1 GDI Main Circuit Diagram (1/5)  
3
Repair Manual  
3-1  
Samsung Electronics  
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SCHEMATIC DIAGRAMS  
Main Circuit Diagram (2/5)  
Repair Manual  
3-2  
Samsung Electronics  
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SCHEMATIC DIAGRAMS  
Main Circuit Diagram (3/5)  
Repair Manual  
3-3  
Samsung Electronics  
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SCHEMATIC DIAGRAMS  
Main Circuit Diagram (4/5)  
Repair Manual  
3-4  
Samsung Electronics  
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SCHEMATIC DIAGRAMS  
Main Circuit Diagram (5/5)  
Repair Manual  
3-5  
Samsung Electronics  
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SCHEMATIC DIAGRAMS  
3.2 PC L Main Circuit Diagram (1/9)  
Repair Manual  
3-6  
Samsung Electronics  
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SCHEMATIC DIAGRAMS  
PCL Main Circuit Diagram (2/9)  
Repair Manual  
3-7  
Samsung Electronics  
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SCHEMATIC DIAGRAMS  
PCL M a i n Circuit Diagram (3/9)  
Repair Manual  
3-8  
Samsung Electronics  
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SCHEMATIC DIAGRAMS  
PCL Main Circuit Diagram (4/9)  
Repair Manual  
3-9  
Samsung Electronics  
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SCHEMATIC DIAGRAMS  
PCL MainCircuit Diagram (5/9)  
Repair Manual  
3-10  
Samsung Electronics  
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SCHEMATIC DIAGRAMS  
PCL Main Circuit Diagram (6/9)  
Repair Manual  
3-11  
Samsung Electronics  
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SCHEMATIC DIAGRAMS  
PCL Mai n Circuit Diagram (7/9)  
Repair Manual  
3-12  
Samsung Electronics  
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SCHEMATIC DIAGRAMS  
PCL M a i n Circuit Diagram (8/9)  
Repair Manual  
3-13  
Samsung Electronics  
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SCHEMATIC DIAGRAMS  
PCL M a i n Circuit Diagram (9/9)  
Repair Manual  
3-14  
Samsung Electronics  
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3.3 HVPS Circuit Diagram (1/2)  
5V  
18V  
24VS  
C402  
103  
R407  
240K  
R401  
100  
T401  
KAB-006  
D401  
4KV  
C404  
R426  
R405  
220KF  
3KV 471  
R411  
2.2K  
MGR1/2W 100KF  
R422  
5.6K  
1
7
6
MHV  
R403  
R404  
33K  
R413  
MGR1/2W 6MF  
110KF  
12  
13  
Q401  
Q402  
D526-Y  
+
-
14  
5
2
A708-Y  
C406  
3KV 471  
MHV-PWM  
3
R416  
C405  
D402  
4KV  
4
D111  
2KV 680  
MGR1/2W 15MF  
R408  
47K  
1N4148  
U1-D  
KA324  
R402  
56KF  
CN1-#6  
U2-B  
7407  
R414  
MGR1/2W 6MF  
4
R412  
2K  
R409  
430  
C408  
104  
C401  
222  
OPC  
R406  
2.2KF  
C403  
333  
R410  
1W  
VR401  
50K  
3
ZD401  
1W 130V  
R417  
MGR1/2W 15MF  
D403  
1N4148  
24VS  
T501  
KAB-006  
D502  
4KV  
5V  
18V  
R516  
MGR1/2W 50K  
R514  
MGR1/2W 15MF  
1
7
SUPPLY  
R510  
47K  
C503  
R501  
5.6K  
104  
Q502  
D526-Y  
R503  
100  
R508  
86.6KF  
5
2
6
C506  
3KV 471  
ZD501  
1W 100V  
C505  
2KV 680  
Q501  
BIAS-PWM  
CN1-#7  
A708-Y  
1
2
9
-
R507  
27K  
8
4
R502  
2.2K  
DEV  
10  
R515  
MGR1/2W 15MF  
U2-A  
7407  
+
R519  
R511  
47K  
R512  
430  
MGR1/2W 50K  
R505  
U1-C  
100KF  
R506  
100KF  
KA324  
C501  
104  
R517  
MGR1/2W 15MF  
R504  
2K  
C502  
222  
R513  
1W 3  
C504  
333  
R509  
12KF  
D501  
1N4148  
VR501  
50K  
CN1  
GIL-S-9P-S2T2-EF  
24VS  
U3  
KA7818  
24VS  
1
2
3
4
A-GND  
THV-PWM  
THV-EA  
TITLE  
SAMSUNG ELECTRONICS  
SWALLOW-HVPS  
IN  
OUT  
18V  
THV-READ  
MHV-PWM  
BIAS-PWM  
5V  
D-GND  
5
6
7
8
9
+
GND  
DESIGNED CHECKED APPROVED DRW. NO  
C1  
104  
REV.  
1.0  
C2  
104  
C3  
35V 47uF  
REF. NO  
JC  
JH.CHO  
1 OF 2  
SIZE A4  
DATE 01/01/04  
Repair Manual  
3-15  
Samsung Electronics  
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HVPS Circuit Diagram (2/2)  
T201  
HVT-2A  
C208  
6KV 471  
C206  
6KV 471  
24VS  
5V  
18V  
1
7
6
D204  
6KV  
D206  
6KV  
R201  
10K  
D207  
6KV  
D205  
6KV  
R206  
100  
Q204  
D526-Y  
5
2
THV-PWM  
13  
C205  
6KV 101  
12  
11  
10  
D201  
U1-B  
C209  
6KV 471  
C207  
6KV 471  
R208  
30KF  
1N4148  
KA324  
R205  
1K  
CN1-#3  
R213  
2.2K  
5
6
U2-F  
7407  
U2-E  
7407  
Q203  
A708-Y  
+
7
4
C201  
103  
-
THV  
R209  
110KF  
24VS  
R207  
2K  
R215  
430  
R216  
R218  
MGR1/2W 100KF  
BR1/2W 30MJ  
+
R214  
1.2K  
C101  
35V 47uF  
C202  
331  
R210  
D202  
510KF 1N4148  
VR201  
50K  
C204  
473  
R217  
BR1/2W 200MG  
R212  
470K  
C203  
472  
D203  
1N4148  
ZD201  
5.6V  
ZD202  
7.5V  
5V  
CN1-#8  
18V  
R211  
1MF  
18V  
R3  
1/2W 560  
ZD1  
5.6V  
C7  
104  
T301  
KAB-006  
D304  
4KV  
C307  
3KV 471  
R309  
2.2K  
Q301  
A708-Y  
1
7
6
THV-EA  
CN1-#4  
9
8
R315  
BR1/2W 30MJ  
U2-C  
7407  
R307  
33K  
5
2
C306  
2KV 680  
D303  
4KV  
C308  
3KV 471  
Q303  
D526-Y  
18V  
D-GND  
24VS  
4
D301  
1N4148  
R310  
2.2K  
C4  
104  
R314  
2.2KF  
R308  
33K  
R311  
100KF  
VR302  
5K  
Q302  
A708-Y  
3
THV-READ  
CN1-#5  
+
1
R302  
33K  
R303  
100KF  
2
C305  
333  
-
R306  
26.1KF  
R316  
1KF  
U1-A  
KA324  
R304  
200KF  
C303  
333  
R317  
2KF  
R305  
5.1KF  
C302  
102  
R301  
470K  
D302  
1N4148  
C304  
500V 103  
VR301  
10K  
TITLE  
SAMSUNG ELECTRONICS  
SWALLOW-HVPS  
C301  
222  
DESIGNED CHECKED APPROVED DRW. NO  
REV.  
1.0  
JC  
REF. NO  
JH.CHO  
2 OF 2  
SIZE A4  
DATE 01/01/04  
Repair Manual  
3-16  
Samsung Electronics  
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3.4 SMPS Circuit Diagram (110V)  
R502  
1/2W  
560K  
V501  
SCK-054  
F501  
125V 8A  
F502  
125V 3A  
T501  
EER2828  
R518  
22  
C522  
1KV 102  
LF501  
APOLLO12  
LF502  
APOLLO12  
CN501  
L
C501  
D504  
ER1002FCT  
R517  
C508  
R509  
3W  
47K  
222MAD  
R505  
1W  
82  
-
+
F.G  
N
1W  
47K  
CN5-7,9,11  
+24V 1.8A  
C511  
BD501  
FL406  
12  
1
C520  
C521  
R519  
5W  
C519  
104  
TNR501  
C502  
222MAD  
TNR502 C503  
C505  
104  
N24  
11  
NP  
500  
3
C512  
R506  
1W  
D502  
CN5-8,10,12  
GND  
47K  
L501  
300uH  
R501  
C504  
333  
1W 47  
R514  
C514  
FUSIBLE  
U502  
STRT-G6153  
D501  
ER102  
22  
1KV 102  
R507  
30  
B501  
L502  
10uH  
CN502  
5
1
2
1
DRAIN VCC  
U501  
BTA12-600  
APOLLO12  
CN5-1,3,5  
R512  
330  
D503  
R515  
+5V 1.0A  
SB1040FCT  
2.2K-F  
R521 R520  
150 47K  
R503  
1/4W  
100  
R508  
C507  
104  
1W 180  
PC501  
K1010H  
R511  
4.3K  
C518  
6
10  
C517  
104  
FUSIBLE  
C513  
1uF  
N5  
7
NB  
5
EXIT  
CN5-14  
C515  
10V  
1000uF  
C509  
C510  
PC502  
KMOC3063  
R504  
68K  
R516  
2.2K-F  
1
R510  
OP501  
ITR8406-S  
U503  
KA431  
1W  
0.3  
R513  
1/2W  
1.5K  
PC501  
K1010H  
CN5-2,4,6  
GND  
C506  
222MAD  
+5V  
+24VS  
CN5-13,15  
NO MARKING RESISTOR 1/4W-J (5%)  
+24VS2  
FUSER_ON  
CN5-16  
C8  
C3  
+24VS  
D3  
+24V  
CN4  
CN1  
D2  
3
2
1
C1  
331  
GND  
GND  
2
1
11  
5
U1  
A2918SWH  
35301-0350  
35303-0250  
CN2  
13  
8
1
17  
EGMOT_PHA  
EGMOT_PHB  
PHASE1  
PHASE2  
1A  
1B  
1
2
Q3  
1008-Y  
R12  
510  
Q1  
1008-Y  
R13  
2.2K  
CLUTCH  
14  
7
2
4
FAN  
2A  
2B  
+EGMOT_A1  
+EGMOT_B1  
+ENABLE1  
+ENABLE2  
3
4
R2  
5.6K  
R1  
5.6K  
C2  
35303-0450  
12 16  
5
15 18  
3
6
9
+5V  
331  
GND  
GND  
R7  
1.2K  
R8  
1K  
R10  
1K  
C7  
103  
C5  
C6  
103  
R11  
56K  
R6  
R15  
56K  
C4  
331  
R9  
R5  
17.4K-F  
331  
GND  
GND  
GND GND  
Repair Manual  
3-17  
Samsung Electronics  
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SCHEMATIC DIAGRAMS  
SMPS Circuit Diagram (220V)  
R502  
1/2W  
560K  
V501  
SCK-054  
F501  
250V 5A  
F502  
250V 2A  
C522  
1KV 102  
R518  
22  
T501  
EER2828  
LF501  
APOLLO12  
LF502  
APOLLO12  
CN501  
L
D504  
ER1002FCT  
C501  
R517  
R509  
3W  
47K  
C508  
222MAD  
R505  
1W  
82  
-
+
F.G  
N
1W  
100K  
CN5-7,9,11  
C511  
+24V 1.8A  
BD501  
FL406  
12  
1
C520  
C521  
R519  
5W  
C519  
104  
TNR501  
C502  
C503  
C505  
104  
N24  
11  
NP  
222MAD  
500  
3
C512  
R506  
1W  
D502  
CN5-8,10,12  
GND  
100K  
L501  
300uH  
R501  
C504  
1W 47  
R514  
C514  
1KV 102  
333  
FUSIBLE  
U502  
D501  
ER102  
22  
R507  
30  
B501  
APOLLO12  
L502  
10uH  
STRT-G6153  
CN502  
1
5
2
1
DRAIN  
VCC  
U501  
BTA12-600  
CN5-1,3,5  
R512  
330  
D503  
R515  
+5V 1.0A  
SB1040FCT  
2.2K-F  
R521 R520  
R503  
1/4W  
22  
R508  
C507  
104  
150  
47K  
1W 180  
PC501  
K1010H  
R511  
4.3K  
6
10  
N5  
C518  
C517  
104  
FUSIBLE  
C513  
1uF  
NB  
5
EXIT  
CN5-14  
C515  
10V  
C509  
C510  
PC502  
7
1000uF  
KMOC3063  
R504  
22K  
R516  
2.2K-F  
1
R510  
OP501  
ITR8406-S  
U503  
KA431  
1W  
0.6  
R513  
1/2W  
1.5K  
PC501  
K1010H  
CN5-2,4,6  
GND  
C506  
332MAD  
+5V  
+24VS  
CN5-13,15  
NO MARKING RESISTOR 1/4W-J (5%)  
+24VS2  
FUSER_ON  
CN5-16  
C8  
C3  
+24V  
+24VS  
D3  
CN4  
CN1  
D2  
3
2
1
GND  
C1  
331  
GND  
2
11  
5
1
U1  
A2918SWH  
35303-0250  
35301-0350  
CN2  
13  
8
1
17  
1A  
1B  
EGMOT_PHA  
EGMOT_PHB  
PHASE1  
PHASE2  
1
2
Q1  
1008-Y  
Q3  
1008-Y  
R12  
510  
R13  
2.2K  
CLUTCH  
14  
7
2
4
FAN  
+ENABLE1  
+ENABLE2  
2A  
2B  
+EGMOT_A1  
+EGMOT_B1  
3
4
R2  
5.6K  
R1  
5.6K  
C2  
35303-0450  
+5V  
331  
12 16  
5
15 18  
3
6
9
GND  
R7  
1.2K  
R10  
1K  
C7  
R8  
1K  
C5  
C6  
103  
R11  
56K  
R6  
R15  
56K  
C4  
331  
R9  
17.4K  
R5  
331  
103  
GND  
GND  
GND GND  
Repair Manual  
3-18  
Samsung Electronics  
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SCHEMATIC DIAGRAMS  
3.5 Panel Circuit Diagram  
Repair Manual  
3-19  
Samsung Electronics  
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This manual is made and  
described centering around  
circuit diagram  
and circuit description needed  
in the repair center  
in the form of appendix.  
Samsung Electronics Digital Printing  
CS Group  
Copyright (c) 2001. 10  
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Contents  
CONTENTS  
1. Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page(1-1)  
1-1 Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page(1-1)  
1-2 Precautions on Disassembly and Reassembly . . . . . . . . . . . . . . .page(1-1)  
1-3 Tools for Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page(1-2)  
2. Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page(2-1)  
3. Disassembly and Reassembly . . . . . . . . . . . . . . . . . . . . . . . . . . .page(3-1)  
3-1 Cover Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page(3-1)  
3-2 LED Panel PBA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page(3-2)  
3-3 LSU(Laser Scanning Unit) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page(3-2)  
3-4 Transfer Roller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page(3-3)  
3-5 Motor Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page(3-3)  
3-6 HVPS Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page(3-4)  
3-7 Fuser Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page(3-4)  
3-8 Thermostat and Halogen Lamp . . . . . . . . . . . . . . . . . . . . . . . . . . .page(3-5)  
3-9 SMPS Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page(3-6)  
3-10 Main Board and Sensor Board . . . . . . . . . . . . . . . . . . . . . . . . . . .page(3-7)  
4. Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page(4-1)  
4-1 How to use DCU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page(4-2)  
4-2 The cause and solution of Bad image . . . . . . . . . . . . . . . . . . . . . .page(4-5)  
4-3 The cause and solution of the bad discharge. . . . . . . . . . . . . . . . .page(4-12)  
4-4 The cause and solution of the malfunction . . . . . . . . . . . . . . . . . . .page(4-16)  
4-5 Toner Cartridge Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page(4-21)  
4-6 The cause and solutions of bad environment of the software . . . .page(4-25)  
5. Exploded Views and Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . .page(5-1)  
5-1 Expolded Views and Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . .page(5-2)  
5-2 Front Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page(5-4)  
5-3 Engine/Frame Lower Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . .page(5-6)  
5-4 Fuser Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page(5-8)  
5-5 Shield Engine Unit Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page(5-10)  
5-6 RX Drive Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page(5-12)  
5-7 Plate-Upper Unit Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page(5-14)  
6. Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page(6-1)  
6-1 Block Diagram(GDI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page(6-1)  
6-2 Block Diagram(PCL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page(6-2)  
7. Connection Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page(7-1)  
7-1 Connection Diagram(GDI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page(7-1)  
7-2 Connection Diagram(PCL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page(7-2)  
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