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LASER PRINTER
ML-1200 Series
ML-1210 / ML-1250 / ML-1220M
SERVICE Manual
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
This service manual is also provided on the web, © Samsung Electronics Co.,Ltd. October. 2001
the ITSELF system Samsung Electronics Co., Ltd. Printed in Korea.
http://itself.sec.samsung.co.kr VERSION NO. : 2.03 CODE : JC-0051A
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.
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- WARNING : NEVER OPERATE AND SERVICE THE PRINTER
WITH THE PROTECTIVE COVER REMOVED
ferent from the original, the safety may not function. FROM LASER/SCANNER ASSEMBLY. THE
Even if the part could allow higher voltage than that REFLECTIVE BEAM, ALTHOUGH INVISIBLE, CAN
DAMAGE YOUR EYES.
of the part used, do not replace it and use a regular
product clarified in specifications. Class 1 laser product
2. Be careful not to leave a switch, a cover or a safety Luokan 1 laserlaite
device out when reinstalling or assembling the prod- Klass 1 laser apparat
uct after repair.
Allonpituus 770-795nm
3. Replacing Precautions Teho 0.3mW±0.03mW
Do not change or add parts as you like. You cannot
benefit from such a remodeled product at your will CAUTION INVISIBLE LASER RADIATION WHEN
during the term of guarantee. THIS COVER OPEN. DO NOT OPEN
THIS COVER.
4. You must replace overheated or damaged parts or VORSICHT UNSICHTBARE LASERSTRAHLUNG,
WENN ABDECKUNG GEOFFNET.
cords with regular products. Please solve the prob- NIGHT DEM STRAHL AUSSETZEN.
lem causing any damage or overheating and troubles ATTENTION REYONNEMENT LASER INVISIBLE EN CAS
beforehand. D'OUVERTURE. EXPOSITION DANGERUSE AU
FAISCEAU.
Especially mind the safety on the part with ATTENZIONE RADIAZIONE LASER INVISIBLE IN CASO DI
APERTURA. EVITARE L'ESPOSIZONE LA FASCIO.
this mark.
PRECAUCION REDIACION LASER INVISIBLE CUANDO SE
You must use regular parts described in specifi- ABRE. EVITAR EXPONERSE AL RAYO.
cations for the parts inflammable and where the
current can be flown. Otherwise any hazard CAUTION : Avoid exposure to invisible laser radiation when the
development unit is not installed.
such as an electric shock or a fire could occur.
1-2 Precautions on Disassembly and Reassembly
Very careful precautions should be taken when replacing 7. When disassembling, assembling, also observe small
parts. Before replacing, please check cables because components are located in place.
you cannot put the cables that you removed for replacing 8. If you uncover and turn the machine over to replace
parts into the proper place if you would not make sure of some parts, toner or paper particles may contaminate
where they were connected and in which condition. 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 Many of parts are held in
developer or not to expose them to light. place with plastic latches.
2. Turn the power switch off. The latches break easily :
3. Take out the power plug, printer cable from the printer. release them carefully.
4. Use only the same type of part as original when replac- To remove such parts,
ing parts. press the hook end of the
5. Do not force to open or fasten plastic material compo- latch away from the part to
nents. which it is latched.
6. Be careful that small parts such as screws should not
get in the printer.
Samsung Electronics 1-1
Precautions
1-3 Tools for Troubleshooting
The following tools are recommended for safe and smooth troubleshooting described in this service manual.
1 DCU(Diagnostic Control Unit)
Standard: Test equipment to diagnose the Laser 4 Driver
Standard: "-" type, "+" type (M3 long, M3 short,
printer supplied by Samsung Electronics. M2 long, M2 short).
5 Pinset
Standard: For general home use, small type.
2 DVM(Digital Volt Meter)
Standard: Indicates more than 3 digits.
6 Cotton Swab
Standard: For general home use, for medical ser-
vice.
Ground
7 Cleaning Equipmentsa asoft stuff neutral
Alcohol)dry cloth or
IPA(Isopropyl
detergent.
8 Software(Driver) installation CD ROM
3 Electronic Scale
Standard: 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,
Note such as the main board, SMPS, HVPS.
1-2 Samsung Electronics
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) Under 12.5 sec
Warm-Up Time 30 sec
Power Consumption 25W (Print), 10W (Sleep)
Dimension 329 x 355 x 231 mm (13" x 14" x 9.1")
Weight Max 6.5Kg (With Toner Cartridge)
Controller Processor Jupiter 366MHz 61200 66MHz
Memory 8MB Equivalent 4MB
Emulation SmartGDI 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
Paper Input 150 sheets
Output 100 sheets
Manual 1 sheet
Media Type A4, Letter. Legal, Executive, B5, A5, Folio,
7 3/4(Monarch), #10, DL, C5, C6, B5
Toner Type Single Cartridge
Life 2,500 sheets
Cartridge 2,500 (Initial : 1,000)
Pick up Roller 60,000
Feed Roller 60,000
Transfer Roller 60,000
Fuser 40,000
User interface Key & LED 3Key, 4LEDs
LCD No
Toner Save YES
Reprint YES
Samsung Electronics 2-1
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.
2. Rear Cover : Remove the cover in the direction of a .
3. Top Cover : Remove the cover in the direction of b .
4. Side Cover L, R : Remove the cover in the direction of c .
3. Loosen the right lower part of the cover, then push the
cover in the direction of arrow to loosen the left lower
part.
Samsung Electronics 3-1
Disassembly and Reassembly
3-2 LED Panel PBA
1. Before you remove other covers, you should remove. 3. Remove two screws, and remove LED panel.
· Front Cover (see [3-1 Main Cover])
2. Remove two screws of PCB cover, and widen the
hooks( a b c ) to remove.
4. Remove PCB from the PCB cover.
3-3 LSU(Laser Scanning Unit)
1. Before you remove LSU, you should remove front 3. Remove two connectors from the LSU, then remove
cover, rear cover and top cover. the LSU.
· Main Cover (see [3-1 Main Cover])
2. Remove three screws securing the LSU.
3-2 Samsung Electronics
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.
Samsung Electronics 3-3
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: 3. Remove two screws and unplug a fuser assembly
harness. Then use a " - " screwdriver to unlatch the
· Main Cover (see [3-1 Main Cover])
fuser assembly to remove.
2. Remove two ground screws and a connector as illus-
trated.
3-4 Samsung Electronics
Disassembly and Reassembly
3-8 Thermostat and Halogen Lamp
1. Remove a screw from the fuser assembly and 3. Take the halogen lamp out from the Heat Roller.
remove the thermostat cover, then remove two
screws securing the thermostat.
When you reassemble the halogen lamp,
Note handle it with care as it is fragile.
2. Remove two screws from the fuser assembly, and
take the Heat Roller out.
Samsung Electronics 3-5
Disassembly and Reassembly
3-9 SMPS Board
1. Before you remove the SMPS board, you should 3. Unplug connectors from the main board and connec-
remove: tors from SMPS, then remove the SMPS. Remove
four screws from SMPS and remove the SMPS
· Main Cover (see [3-1 Main Cover])
board.
2. Remove screws in the order of a b then remove
the shield engine assembly.
a
The Engine board and SMPS board are
b integrated in a body.
Note
3-6 Samsung Electronics
Disassembly and Reassembly
3-10 Main Board and Sensor Board
1. Before you remove the main board, you should 3. Release four snap-fits securing the insulator engine
remove: 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.
Samsung Electronics 3-7
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) 4-4-1 All LEDs blinking (Fuser Error)........Page(4-16)
4-1-2 Code ................................................Page(4-2) 4-4-2 All LEDs blinking (SCAN ERROR) .Page(4-16)
4-1-3 Self Diagnostic Mode......................Page(4-3) 4-4-3 Not function of the gear of the fuser due to
4-1-4 Self Test Button ................................Page(4-4) melting away.....................................Page(4-17)
4-1-5 Paper Path Layout ...........................Page(4-4) 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)
4-2 The cause and solution of Bad image 4-4-7 No lamp on when the cover is open
...........................................................Page(4-18)
4-2-1 Vertical Black Line and Band ..........Page(4-5)
4-4-8 Defective motor operation ...............Page(4-19)
4-2-2 Vertical White Line ...........................Page(4-5)
4-4-9 No Power..........................................Page(4-19)
4-2-3 Horizontal Black Band .....................Page(4-6)
4-4-10 Vertical Line Getting Curved .........Page(4-20)
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)
4-5 Toner Cartridge Service
4-2-7 Uneven Density................................Page(4-8)
4-5-1 Precautions on Safe-keeping of Toner Cartridge
4-2-8 Background ......................................Page(4-8) ..........................................................Page(4-21)
4-2-9 Ghost (1)...........................................Page(4-9) 4-5-2 Service for the Life of Toner Cartridge
4-2-10 Ghost (2)..........................................Page(4-9) ..........................................................Page(4-21)
4-2-11 Ghost (3) ..........................................Page(4-10) 4-5-3 Service for Judgement of Inferior Expendables
and the Standard of Guarantee .....Page(4-21)
4-2-12 Ghost (4) .........................................Page(4-10)
4-5-4 Signs and Measures at Poor toner cartridge
4-2-13 Satins on the Face of Page............Page(4-10)
..........................................................Page(4-22)
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)
4-6 The cause and solutions of bad environment
of the software
4-6-1 The printer is not working (1)...........Page(4-25)
4-3 The cause and solution of the bad discharge 4-6-2 The printer is not working (2) .........Page(4-26)
4-3-1 Wrong Print Position .......................Page(4-12) 4-6-3 Abnormal Printing.............................Page(4-27)
4-3-2 JAM 0...............................................Page(4-12) 4-6-4 SPOOL Error ...................................Page(4-28)
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)
Samsung Electronics 4-1
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 Print Start The engine controller received the print order from the video controller.
30 Feed Sensor On The paper is passing out of the Feed Sensor.
40 Feed Sensor off The paper has passed out of the Feed Sensor.
50 Paper Out The paper has passed out of Exit Sensor.
69 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 Cover Open The Printer Cover is open or Toner Cartridge not installed.
70 No Paper No paper in the paper cassette.
71 Paper Jam 0 The front part of paper is jammed between pickup unit and Feed sensor.
72 Paper Jam 1 The front part of paper is jammed between the Discharge sensor and Feed sensor.
73 Paper Jam 2 The front part of paper is jammed just after passing through the discharge sensor.
95 LSU Not Ready LSU Scanner Motor not ready or Hsync signal not output.
4-2 Samsung Electronics
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 Main Motor Operating System
Only the main motor is in operation.
01 Main High Voltage On(THV-)
-1550 voltage output by MHV terminal. Caution : High voltage probe should be used.
02 Transfer High Voltage(-)On(THV-)
-1300 voltage output by MHV terminal. Caution : High voltage probe should be used.
03 Transfer High Voltage (+)Reference on (THV +)
1300 voltage output by MHV terminal. Caution : High voltage probe should be used.
04 DEV/supply High Voltage : DEV/Supply High Voltage Test.
The left one of the three LEDs in the self-test panel is on when DEV high voltage Supply high voltage output
by each HV terminal. 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 Pickup clutch on
The Solenoid in the printer is in operation. To stop the operation, Press the button [shift] and [Enter] together.
07 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 Feed & Exit Sensor Test
Test the Feed sensor and Discharge sensor in the same way as '06'.
09 Cover Open Sensor Test
The same way as code '06'.
10 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.
Samsung Electronics 4-3
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. PTL Test
Indicates the PTL LED.
15. 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
)
ETS
SHE
)
ETS
(150
HE
0S
ER
(10
PAP
ER
ET
PAP
L 1 SHE
ED
ORD
ED
RD
REC
MANUA
CO
RE
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
EXIT 1 SENSOR BOARD
Pr R/L MAIN BOARD
EXIT SENSOR
SMPS
SHIELD SHIELD
4-4 Samsung Electronics
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
1. Damaged develop roller in the Developer 1. If causes 1 and 2 occur in the developer
Digital Printer
or deformed Doctor-blade. cartridge, replace the developer and try to
Digital Printer print out.
Digital Printer
Digital Printer 2. Scratched surface of the discharge roller 2. Replace the transfer roller if occurred as
in the developer, or heavily accumulated No. 3.
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
1. Foreign matter stuck onto the window of 1. Foreign matter stuck onto the window :
Digital Printer
internal lenses of LSU mirror. Clean the LSU window with recommend-
Digital Printer ed cleaner(IPA) Clean the window with a
Digital Printer clean cotton swab.
Digital Printer 2. Foreign matter or toner particles between
the developer roller and blade. 2. Foreign matter in the LSU : Open the
(In case the life of the developer has cover of LSU and clean with a cotton
been expired, white lines occur in front of swab on the surface of the reflex mirror.
the image.)
3. It may occur when Burr and foreign sub- 3. No 3. : Remove the foreign matter and
stances are on the window of the devel- burr of the exposure window.
oper frame.
4. If the fuser is defective, voids occur peri- 4. No. 4. : Open the front cover and check
odically at the top of a black image. 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.
Samsung Electronics 4-5
Troubleshooting
4-2-3 Horizontal Black Band
1. Dark or blurry horizontal stripes occur in the printing periodically.
· Description
(They may not occur periodically.)
Check and Cause Solution
Digital Printer
1. Bad contacts of the voltage terminals to 1. Clean each voltage terminal of the Charge,
Digital Printer
developer. Supply, Develop and Transfer roller.
Digital Printer (remove the toner particles and paper par-
Digital Printer ticles)
Digital Printer
2. The rollers of developer may be stained. 2. Clean the right Gear that has relatively
Charge roller = 37 mm 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.
· Description
2. White spots occur periodically in the printing.
Check and Cause Solution
Digital Printer
1. If dark or blurry black spots occur periodi- 1. Run OPC cleaning Mode Print and run the
Digital Printer
cally, the rollers in the Developer may be Self-test 2 or 3 times.
Digital Printer contaminated with foreign matte or paper
Digital Printer particles.
Digital Printer ( Charge roller : 37 mm interval
OPC drum : 75mm interval)
2. If faded areas or voids occur in a black 2. In case of 75mm interval unremovable in 1,
image at intervals of 75 mm, or black cleanly remove foreign substances stuck on
spots occur elsewhere, the OPC drum the OPC location equivalent to black spots
surface is damaged. and white spots with a dry duster.
3. If a black image is partially broken, the 3. The transfer roller guarantees 50,000
transfer voltage is abnormal or the trans- sheets printing. If the roller's life is expired,
fer roller's life has 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.
4-6 Samsung Electronics
Troubleshooting
4-2-5 Light Image
· Description The printed image is light, with no ghost.
Check and Cause Solution
Digital Printer
Digital Printer 1. Develop roller is stained when the toner 1. Check if the Toner Save mode is off.
of developer cartridge is almost con-
Digital Printer sumed.
Digital Printer
Digital Printer 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
Digital Printer
Digital Printer 1. No charge voltage in the engine board. 1. Clean the high voltage charge terminal.
( Perform DCU diagnostic code 01)
Digital Printer
Digital Printer 2. Charge voltage is not turned on due to 2. Check the state of the connector which
Digital Printer the bad contacts between power supply connects the engine board and HVPS.
in the side of the Developer and charge
terminal of HVPS.
3. Replace the HVPS if not solved by the
above direction 1 and 2.
Samsung Electronics 4-7
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 1. Replace both the left and right Spring
springs of the transfer roller is not even, Holder.
the springs are damaged, the transfer
roller is improperly installed, or the trans-
fer roller bushing or holder is damaged.
2. The toner level is not even on the devel- 2. Occur in the developer cartridge, replace
oper roller due to the bad blade. 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
1. Recycled recording paper has been 1. B/S is not guaranteed when using recycled
Digital Printer
used. paper.
Digital Printer
Digital Printer
Digital Printer 2. The life of the Developer has expired. 2. Replace the Developer that has expired.
(The weight at the expiration of the
developer's life: 800 ± 20g)
3. The up-to-down movement of the trans- 3. Clean the busing part of the transfer roller.
fer roller is swift?
4. The HVPS is normal? 4. Replace the Developer if not solved by the
(Perform DCU diagnostic code 01~04) above direction 1~3.
4-8 Samsung Electronics
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 1. Bad contacts caused by contamination 1. Clean the terminals when contaminated by
Digital Printer from toner particles between high voltage toner particles.
75mm
Digital Printer terminal in the main body and the elec-
Digital Printer trode of the Developer.
Digital Printer
Digital Printer 2. Bad contacts caused by contamination 2. Occur in the developer cartridge, replace
from toner particles between high voltage the developer and try to print out.
terminal in the main body and the one in
the HVPS board.
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 4. If not solved by the direction 3, check the
expired. 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.
· Description
(When printing on card stock or transparencies using manual feeder)
Check and Cause Solution
Digital Printer When printing on card stock thicker than nor- Select 'Thick Mode' on paper type menu from
Digital Printer mal paper or transparencies such as OHP, the software application and after using return-
75mm
Digital Printer higher transfer voltage is required. ing to the original mode is recommended.
Digital Printer
Digital Printer
Digital Printer
Samsung Electronics 4-9
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
32mm
the developer and try to print out.
Digital Printer
Digital Printer
2. The abnormal voltage and bad contact of 2. Check the approved voltage of the supply
Digital Printer
Digital Printer the terminal of the supply roller
roller. roller and contact of the terminal and adjust
if necessary.
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 1. Disassemble the fuser and remove the
high. contaminated toner particles on the roller
47mm
Digital Printer
Digital Printer and clean the foreign matter between
Thermistor and Heat roller.
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
1. Toner leakage due to improperly sealed 1. Replace the developer cartridge.
Digital Printer
developer.
Digital Printer
Digital Printer 2. If the transfer roller is contaminated, satins 2. If the transfer roller is contaminated, run PC
Digital Printer on the face of page will occur. Cleaning Mode Print 2 or 3 times.
And perform Self-Test 2 or 3 times to
remove contamination.
4-10 Samsung Electronics
Troubleshooting
4-2-14 Satins on Back of Page
· Description The back of the page is stained at 47mm intervals.
Check and Cause Solution
Digital
Digital Pri 1. Transfer roller is contaminated. 1. Perform the OPC Cleaning Mode Print 2 or
3 times. Run Self-Test to remove the conta-
Digital Printer mination of the transfer roller.
Digital Printer
Digital Printer 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
Digital Printer
Bad ground contacts in OPC and/or devel- Remove contamination of the terminals of the
Digital Printer
oper. developer and the unit.
Digital Printer
Digital Printer
Digital Printer
4-2-16 Blank Page Print out (2)
1. Blank page is printed.
· Description 2. One or several blank pages are printed.
3. When the printer turns on, several blank pages print.
Check and Cause Solution
1. Bad ground contacts in OPC and/or 1. Remove contamination of the terminals of
developer. 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.
Samsung Electronics 4-11
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 Replace the defective actuator
actuator. (Service Parts : Figure 8-16 , chapter 5)
4-3-2 JAM 0
1. Paper is not exited from the cassette.
· Description
2. Jam-0 occurs if the paper feeds into the printer.
Check and Cause Solution
1. Check the Solenoid by using DCU 1. Replace the solenoid. (Service Parts :
diagnostic mode 06. Figure 8-11 , chapter 5)
LSU
EXIT 2
PICK UP 2. Check if the pad is loose due to bad 2. Replace the side-pad Assembly L or
CARTRIDGE sealing of the side-pad. R, if necessary.
EXIT 1
FEED SEN (Service Parts : Figure 8-13 , 8-14,
EXIT SENSOR chapter 5)
3. Check the surface of the roller-pick-
JAM 0
up for foreign matter. 3. Clean with soft cloth dampened with
IPA(Isopropyl Alcohol) or water.
4. If continuous clusters occur, check 4. Replace the Housing-Pickup and/or
whether the assembly slot between Shaft-Pickup.
shaft-pickup and housing-pickup (Service Parts : Figure 8-135, 8-12, chapter 5)
become open or is broken away.
5. If the paper feeds into the printer
rand Jam 0 occurs, perform DCU to
check feed-sensor of the sensor
board.
4-12 Samsung Electronics
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 1. Replace the SMPS. (Service Parts :
front of or inside the fuser. Figure 10, chapter 5)
LSU
(Perform DCU diagnostic code of)
EXIT 2
PICK UP
CARTRIDGE
FEED
EXIT 1
FEED SEN
2. If the recording paper is stuck in the 2. Reassemble the Actuator-Feed and
EXIT SENSOR discharge roller and the fuser just Spring-Actuator if the returning is bad.
JAM 1
after passing through the Actuator-
Feed, Feed Actuator may be defec-
tive.
4-3-4 JAM 2
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 paper is completely fed out of 1. Check if the exit sensor actuator is
the printer, but Jam 2 occurs : Exit defective.
LSU sensor is defective. · Check if the actuator exit is unformed
EXIT 2
PICK UP
· After the paper is completely dis- (Check if the lever part is unformed
CARTRIDGE
charged, actuator Exit should return in shape).
to the original position to shut the · Check whether burrs occur in the
FEED SEN
EXIT 1 photo-sensor. Sometimes it takes assembly part of the actuator exit or
EXIT SENSOR
longer hour than it should and does not and if the actuator is smoothly
JAM 2 not return. operated.
· Check if foreign matters and wire get
caught in the actuator exit's operation.
2. If the paper is rolled in the Fuser Roller: 2. If the paper is stuck in the fuser : dis-
· This occurs when a Guide claw is assemble the fuser and remove the
broken away or transformed. jammed paper, and clean the surface
· It occurs when the Spring of a Guide of the pressure roller with dry gauze.
claw