Samsung ML-7000P User manual

ML-7000 Series
ML-7000P
ML-7000N
QwikLaser 7000
QwikLaser 7000P
QwikLaser 7000N
Laser printer Contents
SERVICE Manual
1. Precautions
2. Reference Information
3. Product Information
4. Disassembly
5. Trouble Shooting
6. Exploded Views & Parts List
7. Block Diagrams
8. PCB Diagrams
9. Port Thru
(Network Printer Card)
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5. Troubleshooting
5-1 Print Quality
Error status Check Solution
1. Check HVPS output voltage 1. Refer to HVPS output spec
Dark Image 2. Check terminal contact for - Replace the engine board
HVPS. - Refer to “4 - 11”
2. Fix the terminal to contact well.
1. Check the toner quantity. 1. Replace image cartridge.
Light Image 2. Check HVPS output voltage 2. Refor to HVPS output spec.
3. Check the terminal contact for -Replace the engine board.
HVPS. 3. Fix the terminal to contact well.
1. Compare new image cartridge 1. Replace image cartridge
Horizontal Density with present one
Band. 2. Contamination of Transfer 2. Replace transfer roller
Roller
1. Contamination of Fuser Unit 1. Clean Fuser Unit or change
If not improved, replace it.
2. Contamination of Heat roller 2. Clean Heat Roller
Print Contamination - Refer to “4-5”
3. Contamination of OPC Drum 3. Clean OPC Drum.
If not improved, replace image
cartridge.
1. Contamination of Fuser Unit 1. Clean Fuser Unit.
If not improved, replace it.
Toner on Backside - Refer to “4-5”
of printer page 2. Contamination of transfer Roller 2. Replace Transfer Roller
3. Contamination fo paper path 3. Remove the contamination on
paper path.
1. Check HVPS output voltage 1. Refer to HVPS output spec
2. OPC Drum contamination or - Replace the engine board
image cartridge life 2. Replace the image cartridge
3. Check the contamination of 3. Clean the lens with a soft
Back Ground PTL lens dry cloth
4. Check the terminal contact for 4. Fix the terminal to contact well.
HVPS.
5. Check the contamination fo transfer 5. Relpace Transfer Roller
roller.
Vertical Black Streak 1. OPC Drum scar 1. Clean OPC Drum
and band 2. OPC Drum damage 2. Replace image cartridge
Vertical White Streak 1. Contamination of LSU window 1. Clean LSU window
2. If not improved,
replace image cartridge
1. OPC Drum scar or particle 1. Clean OPC Drum & roller
2. Heat roller scar or particle 2. Cleaning heat roller
3. Develope roller scar or particle 3. Clean the develope roller.
Partial Black Image If not improved,
(periodic) replace image cartridge.
4. Charge roller scar or particle 4. Clean the charge roller.
If not improved,
replace image cartridge.
Partial White Image 1. OPC Drum scar or particle 1. Clean OPC Drum
(not periodic) 2. Check the cartridge life 2. Replace image cartridge
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Error status Check Solution
1. Check HVPS voltage 1. Refer to HVPS output spec.
- Replace the engine board
2. Check the GND OPC contact. 2. Fix contact points to fit well.
- Contact among GND OPC
contact points.
- Image cartridge.
- GND OPC terminal on frame
- GND OPC terminal on the
No image (all white) engine board
- Confirm the voltage between
GND-OPC and GND-Frame.
: -130V approx
3. Check LSU operation. 3. Replace the LSU.
- Refer to DCU control “05” -Refer to “4-8”
4. Compare new video board 4. Replace the video board.
with present one.
5. Toner empty 5. Replace the image cartridge.
1. Check the charger voltage 1. Refer to HVPS output spec
All Black Image 2. Check the terminal contact - Replace the engine board
3. Compare new video board with 2. Replace terminal
present one 3. Replace video board
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5-2 HVPS Output Spec
DCU CODE NO. HVPS OUTPUT REMARK
CHARGER “01” - 1.55 KV
TRANSFER “-” “02” -1KV~ -1.4KV
TRANSFER “+” “03” +1.8 KV
BIAS “04” - 500 V
SUPPLY “04” - 700 V
OPC GND
¶°- 130 V
1. Turn off the printer
2. Open the rear cover and disassemble
the cover-shield.
3. Connect the DCU on engine board and
close the rear cover.
4. Open the top cover.
5. Remove image Cartridge.
6. Push the Cover Open Switch
7. Select the Diagnostic mode and
measure HVPS output.
°›Recommanded Test Equipment
- DVM -High Voltage Probe
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5-3 Malfunction
Error status Check Solution
1. Check FUSE 1. Replace SMPS.
- F1(8A), F2(5A) OPEN. - Refer to “4-12”
No Power 2. Check FUSE. 2. Measure the resistance +5V and GND.
- F3(250V/3A) OPEN. (Engine board CN5-pin6 and CN5-
pin9). If find the short circuit, replace
the Engine board.
1. Check Fuser unit To disassemble the Fuser unit,
- Thermostat open refer to “4-5”.
- hallogen lamp defect 1. If the thermostat of the fuser unit
Normal : 110V version - 2~3
•ÿis opened. replace it.
220V version - 5~6•ÿ
2. Check themistor wire assembly defect. 2. If the thermistor wire of the fuser unit
Internal Error 11 Normal : 2~400k•ÿis defected, replace it.
(Fuser Error) 3. Check SMPS 3. If the fuser unit is normal,
- CN2 conection on SMPS replace SMPS.
- Fuse(F2) open
- Defect of component related to Fuser
control.
4. Check Engine Board 4. If not normal operation after replacing
- CN7 connection it, replace the engine board.
- Fuser control line:
Cn5-2 level (Lamp on : 0.2V, Lamp off:24V)
Check the Cover Open operation 1. Replace cover open Unit
1. Cover open unit defect -Refer to “4-6”
Cover open 2. Cable damage and connection 2. Replace cover open switch
3. Engine board defect assembly, and connect properly.
3. Replace the engine board.
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Error status Check Solution
1. Check the exit sensor. 1. Replace Exit sensor.
- Refer to DCU mode “08” - Refer to “4-11”
2. Check the exit sensor actuator. 2. Replace Exit sensor actuator.
Jam 2 3. Check the Exit Roller. - Refer to “4-5, 6-6”
“Paper is stopped 4. Check the Cover Rear. 3. Replace Exit Roller.
just after exit sensor” 5. Check the Contamination of Fuser Unit - Refer to “4-3, 6-1”
4. Replace Cover Rear.
- Refer to “6-1”
5. Replace or Clean Fuser Unit
- Refer to “4-5, 6-6”
1. Check the operation of Duplex Clutch 1. Replace Duplex Clutch.
- Refer to DCU mode “12” - Refer to “4-6”
2. Check the Duplex sensor 1. 2. Replace the DS1 on Engine Board.
- Refer to DCU mode “07” 3. Replace Duplex sensor 1 actuator.
Duplex Jam 1 3. Check the Duplex sensor 1 actuator. - Refer to “4-11”
4. Check the Cover Rear. 4. Replace Cover Rear.
5. Check the bracket duplex unit - Refer to “6-1”
6. Check the duplex solenoid. 5. Replace bracket duplex unit
The resistance of duplex solenoid: - Refer to “6-8”
40~50 ohm. 6. Replace duplex solenoid ass’y.
1. Check the Duplex sensor 2. 1. Replace the DS2 on Engine board.
- Refer to DCU mode “07” 2. Replace Duplex sensor actuator.
Duplex Jam 2 2. Check the Duplex sensor 2 actuator. 3. Replace Gear of shield pcb
3. Check the Gear of shield pcb - Refer to “4-11, 6-7”
- Check all the gear for correct installation
1. Check the LED Array. 1. Replace LED Array.
PTL Error 2. Check the cable connection or wire defect. - Refer to “6-2”
(Pre Transfer Lamp) 3. Check Joint board. 2. Replace harness or reconnection.
3. Replace Joint board.
- Refer to Disassembly
1. Check image cartridge life 1. Replace image cartridge.
2. Check Toner sensor contact. 2. Replace harness or reconnection.
Toner Empty 3. Check Joint board 3. Replace Joint board.
4. Compare new image with present on. - Refer to “4-4”
4. Replace image cartridge.
1. Check OUT-BIN sensor. 1. Replace OUT-BIN sensor.
- Refer to DCU mode “09” 2. Replace OUT-BIN sensor
OUT-BIN Full 2. Check OUT-BIN sensor actuator. actuator.
3. Check cable connection or wire defect 3. Connect the cable correctly or replace
the cable.
1. Check the Cable between Engine and 1. Connect the cable correctly or
Internal Error 20 Video controller. replace the cable.
(Engine Error) (Engine board CN10
®MVideo controller - Refer to “4-4”
board J11.) 2. Replace Engine board.
2. Engine board defect.
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Error status Check Solution
1. Check the DC supply for laser 1. If +5Vs for laser diode isn’t supplied.
scanning unit check the cover switch assembly for
+5Vs and fix it,
Internal Error 10 2. Check laser scanning unit 2. If the DC power supply for laser
(Scanner Error) - Refer to DUC mode “05” scanning unit has normal operation,
replace the laser scanning unit
3. Check the cable connection and defect 3. Replace cable and connect properly.
4. Engine board. 4. If not normal operation after replacing
it, replace the engine board.
1. 1st cassette feeding
1) Check the operation of Pick-up Clutch 1. Replace the Pick-up solenoid on
- Refer to DCU mode “06” Engine Board.
- Refer to “4-11”
2) Check PAD of Pickup roller. 2. Replace PAD.
- Refer to “4-7, 6-5”
3) Check the Gear of Pickup Unit. 3. Replace Pickup Unit Gear.
- Refer to “4-7, 6-5”
4) Check paper installation in cassette 4. Install paper properly.
2. Multi purpose feeding
1) Check the operation of 1. Replace MP solenoid.
multi purpose Clutch If not normal operation after replacing
- Refer to DCU mode “13” it, replace the engine board.
Jam 0 - Check MP solenoid. - Refer to “4-11”.
1. Paper is not The resistance of MP solenoid 70~80
•ÿ2. Replace PAD
exitted from cassette 2) Check PAD of Pickup roller - Refer to “4-9, 6-4”
3) Check Joint board 3. Replace Joint board.
2. Paper is stopped Measure the CN503-2pin - Refer to “4-4”
before feed sensor. 4) Check the Gear of multi Purpose 4. Replace Pickup Unit Gear.
Pickup Unit 5. Connect the cable correctly
5) Check cable connection or wire defect. or replace the cable.
3. Second cassette feeding
1) Check Pickup Clutch for SCF. 1. Replace the pick-up clutch for SCF.
- The resistance of SCF solenoid: 70~80•ÿIf not improved, replace SCF board
2) Check PAD of Pickup roller 2. Replace PAD.
3) Check the Gear of pickup Unit - Refer to “6-11”
4) Check paper installation in cassette. 3. Replace Pickup Unit Gear.
5) Check cable connection or wire defect. - Refer to “6-11”
4. Reinstiall paper properly.
5. Connect the cable correctly, or
replace the cable.
1. Check the Feed sensor. 1. Replace Feed Sensor.
Jam 1 - Refer to DCU mode “08” - Refer to “4-11”
“Paper is stopped 2. Check the Feed Sensor actuator 2. Replace Feed Sensor actuator.
on feed sensor” 3. Check the paper installation in - Refer to “4-11, 6-2”
cassette. 3. Reinstall paper properly.
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Error status Check Solution
- Refer to DCU mode “00”
1. Check the supply voltage. (+24Vdc) 1. Replace to cover open unit.
Engine board CN1 -2,5 pin 2. Replace cable
2. Check the Motor cable for cuts or 3. Replace Motor.
pinched wiring. 4. Replace Engine board.
Main Motor 3. Check the resistance for Motor between 5. Replace Motor Drive Unit
pin No. 1 to 3(4 to 6) - Refer to “4-6, 6-9”
The resistance of motor : 3
•ÿapprox.
4. Check the Engine board.
5. Check Gear of Motor Drive Unit.
- Check all the gear for correct
installation.
1) 1’st Cassette Feeder
1. Check the paper empty sensor 1. Replace the paper empty sensor on
- Refer to DCU mode “07” Engine board.
2. Check the paper empty sensor actuator. 2. Replace paper empty sensor actuator.
2) Multi Purpose Feeder
1. Check the paper empty sensor for MP. 1. Replace MP sensor assembly.
Paper Empty - Refer to DCU mode “07” 2. Replace MP paper empty sensor
2. Check the MP paper empty sensor actuator.
actuator. If not improved, replace
the engine board
3) Second Cassette Feeder
1. Check the paper empty sensor for SCF 1. Replace the paper empty sensor on
- Refer to DCU mode “07” S.C.F board.
2. Check the paper empty sensing actuator 2. Replace MP paper empty sensor
for SCF. actuator.
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5-4 .Connector Pin Assignment
5-4-1. Engine Board Connector Pin Assignment
CONNECTOR PIN-NO DESCRIPTION IDLE ACTIVE IN/OUT
1 MOTOR_PB* +24V PULSE O
CN1 2.5 +24V +24V +24V -
MOTOR 3 MOTOR_PB +24V PULSE O
4 MOTOR_PA* +24V PULSE O
6 MOTOR_PA* +24V +24V O
CN2 1 +24V +24V +24V O
DUPLEX 1 D_CLUTCH +24V L -
CN3 1 +24V +24V +24V -
FAN 2 NC NC NC -
3 FAN +24V L O
1 CAST_SENS1 H L I
CN4 2 CAST_SENS2 H L I
CASSETTE 3 CAST_SENS3 H L I
BOARD 4 DGND DGND DNGD -
1 +24VS2 +24V +24V -
2 FUSERON +24V L O
CN5 3,5,7 AGND AGND AGND -
SMPS 4 +5Vs +5V +5V -
6,8,10 +5V +5V +5V -
9,11,12 DGND DGND DGND -
13,14,15,16 +24VS2 +24V +24V -
1,2,3 +5V +5V +5V -
4 MP_CLUTCH L 0.7V O
5 +5Vs +5V +5V -
6 Q_LAMP L 0.7V O
7,9 +24VS2 +24V +24V -
CN6 8 SCF_READY H L I
JOINT BOARD 10 STS_SCF PULSE PULSE I
INTERFACE 11,13 AGND AGND AGND -
12 MP_PAPER H L I
14 TONER H L I
15,17 DGND DGND DGND -
16 CMD_SCF PULSE PULSE O
18 OPT_CLK PULSE PULSE O
CN7 1 THERMISTOR - - -
THERMISTOR 2 THERMISTOR - - -
1 +5V +5V +5V -
CN8 2 DCU_DATA PULSE PULSE I/O
DCU 3 DCU_CLK CLOCK CLOCK O
4 DGND DGND DGND -
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CONNECTOR PIN-NO DESCRIPTION IDLE ACTIVE IN/OUT
1.4 DGND DGND DNGD -
2 VDO H L O
3 LDON H L O
CN9 5 +5Vs +5V +5V -
LSU 6 HSYNC H L I
7 LREADY H L I
8 PMOTOR +24V L O
9 AGND AGND AGND -
10 +24VS2 +24V +24V -
1 EBUSY H L O
2,17,19,20,21 DGND DGND DNGD -
22,23,24
3 EMSG H L O
4 EXIT_PAP H L O
5 CCLK H PULSE I
CN10 6 PRINT H L I
VIDEO 7 VDI H L I
CONTROLLER 8 CPRDY - -
INTERFACE 9 PSYNC H - O
10 READY H L O
11 HSYNC H L O
12 NC NC NC -
13,15,16,18 +5V +5V +5V -
25,27,28
14 CMSG H I
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5-4-2. Joint Board Connector Pin Assignment
CONNECTOR PIN-NO DESCRIPTION IDLE ACTIVE IN/OUT
1,2,4 +5V +5V +5V -
3 MP_CLUTCH L 0.7V O
5 Q_LAMP L 0.7V O
6 +5Vs +5V +5V -
7 SCF_READY H L I
CN501 8,10 +24VS2 +24V +24V -
JOINT BOARD 9 STS_SCF PULSE PULSE I
INTERFACE 11 MP_PAPER H L O
12,14 AGND AGND AGND -
13 TONER H L I
15 CMD_SCF PULSE PULSE O
16,18 DGND DGND DGND -
17 OPT_CLK PULSE PULSE O
1 +5V +5V +5V -
2 AGND AGND AGND -
CN502 3 +24V +24V +24V -
SCF 4 STS_SCF PULSE PULSE O
INTERFACE 5 CMD_SCF PULSE PULSE I
6 OPT_CLK PULSE PULSE I
7 SCF_READY H L O
8 DGND DGND DGND -
CN503 1 +24V +24V +24V -
MP_CLUTCH 2 MP_CLUTCH +24V L O
CN504 1 +5V +5V +5V -
Q_LAMP 2 Q_LAMP +5V L O
CN505 1 MP_SENSOR H L I
MP_SENSOR 2 DGND DGND DGND -
3 +5V +5V +5V -
CN506 1 +5V +5V +5V -
TONER 2 TONER H L O
3 AGND AGND AGND -
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5-4-3. S.C.F Board Connector Pin Assignment
CONNECTOR PIN-NO DESCRIPTION IDLE ACTIVE IN/OUT
1 +5V +5V +5V -
2 AGND AGND AGND -
CN1 3 +24V +24V +24V -
ENGINE 4 STS_SCF PULSE PULSE O
JONIT BOARD 5 CMD_SCF PULSE PULSE I
INTERFACE 6 OPT_CLK PULSE PULSE I
7 SCF_READY H L O
8 DGND DGND DGND -
1 MOT_PA +24V PULSE -
CN2 2 MOT_PB +24V PULSE O
MOTOR 3 MOT_PA* +24V PULSE O
4 MOT_PB* +24V PULSE O
1 +5V +5V +5V -
CN3 2 DCU_IN/OUT PULSE PULSE I/O
DCU 3 DCU_CLK CLOCK CLOCK O
4 DGND DGND DNGD -
CN4 1 +24V +24V +24V -
PICK UP 2 CLUTCH +24V L O
1 CASET_1 H L I
CN5 2 CASET_2 H L I
CASSETTE 3 CASET_3 H L I
4 DGND DGND DNGD -
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5-5 .Troubleshooting of Video Controller
Most electronic products are sensitive to connectors and assemblies that are not complete seated. Therefore, before
starting the troubleshooting procedure, do a mechanical check of all the connectors and assemblies to make sure that
everything is properly seated.
1. For a complex malfunction, check first for a bad weld, short circuit or loose wire on the solder area of the board
2. Input low level is standard for the TTL logic level below 0.8V.
Input high level is standard for the TTL logic level above 3.5V.
But, for PowerPC 603e, the input low level is less than 0.8V, and the input high level is more than 2.0V.
3. USE an oscilloscope or logic analyzer for inspecting the crystal oscillator or its waveform.
5-5-1. Troubleshooting Flow Chart
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Power Error
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System Error
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Engine Error
Self Test Error
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Parallel Interface Error
Printing Error
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5-5-2. Troubleshooting Table of Video Controller Board
NO. Error Type Ckeck List Repair
Power cord connection Connect the power cord
Vcc voltage(nominal is +5V) level Refer to the section of
Vcc voltage should be in the range between+4.38-+5.2V Engine troubleshooting
The backlight Short Between Vcc and GND Repair board
1 of LCD is not Mutual connection of engine, key panel to LCD
lit up panel’s connected cable(10pin), video board to key Connect the cable to
panel’s connected cable(20pin) and engine interface connector
cable(28pin)
The pin of connector is straigh.
Mutual connection of panel cabel(10pin) Confirm the connection
video board to key panel’s connected cable(20pin) of connector
Repair or replace it
Any component damage on a video controller board. with appropriate tools.
It doesn’t If uanable to do this,
2displayed replace video board.
characters on Any foreign conductive chips of solder or material Remove any foreign
LCD is on the video controller board or is laid between conductive chips on the
IC pins after power off. video controller board.
Reset Error:Reset signal is normal high during operation
System source clock is a 50ß÷
Check point : U16(FS741)’s pin No.6, Replace the FS741
The output clock of QP17000 is a 25ß÷.
The input clock of CPU(U26) and U24 is a 25ß÷. Replace the board
The video data colck source is a 62.7639ß÷at OSc2
The input clock of U31 is a 62.76397ß÷.
3 White copy The output clock of U31 is a 16ß÷.
The input clock of U2’s pin No.125 is a 16ß÷. Replace the board
°·Check the normal operation of HSYNC* and PSYNC* Active low impulse
4 DRAM Error °·Check the DRAM address signals.(pin No. 17-20, 23-28 : U20, U290)
°·Check the DRAM data signals. (pin No. 2-5. 7-10. 33-36. 38-41 : U20, U29)
5 EEPROM °·Check the EEPROM clock signal. (pin No. 2 : U1)
°·Check the EEPROM data signals. (pin No. 3,4 : U1)
6 ROM Error °·Check the ROM chip select signals and read signal (pin No. 12,14)
°·CHeck the ROM data signals. (pin No. 15-22, 24-31 : U25, U27, U30, U32)
7 Engine Error °·Refer to the section of Engine troubleshooting
Parallel °·CHeck the operation of printer driver. Refer to USER’s manual
8 Interface °·Check the printer cable(bidirectional cable) Replace the printer
Error cable
General desc- °·Please refer to the user’s manual.
9riptions of °·If you can’t fix the trouble of video controller Replace the board
troubleshooting board, replace the video board by the verified
board.
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4. Disassembly
4-1 Front View
4-2 Rear View
Control Panel
Cover Open
Cover Front
Cover Tray
Power Switch
Paper Level Indicator
Cover Rear
°‹
°‹
°‹
°‹
°‹
°‹
°‹
°‹
°‹
Controller
Cassette
Power Inlet
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4-3 Cabinet Disassembly
4-3-1. Cover Right
Remove the screws and open the
Cover Rear.
In order to remove the Cover Right.
Please see the hook which locks
the cabinet to the frame, right hand
should first grab the hook and pull it
out for releasing the hook from the
frame.
°‹
°‹
Screw
Cover Rear
Cover Right
Screw
Hook
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