Troubleshooting - Samsung ML-7000 Series Service Manual

5. Troubleshooting

5-1 Print Quality
Error status
Dark Image
Light Image
Horizontal Density
Band.
Print Contamination
Toner on Backside
of printer page
Back Ground
Vertical Black Streak
and band
Vertical White Streak
Partial Black Image
(periodic)
Partial White Image
(not periodic)
Samsung Electronics
Check
1. Check HVPS output voltage
2. Check terminal contact for
HVPS.
1. Check the toner quantity.
2. Check HVPS output voltage
3. Check the terminal contact for
HVPS.
1. Compare new image cartridge
with present one
2. Contamination of Transfer
Roller
1. Contamination of Fuser Unit
2. Contamination of Heat roller
3. Contamination of OPC Drum
1. Contamination of Fuser Unit
2. Contamination of transfer Roller
3. Contamination fo paper path
1. Check HVPS output voltage
2. OPC Drum contamination or
image cartridge life
3. Check the contamination of
PTL lens
4. Check the terminal contact for
HVPS.
5. Check the contamination fo transfer
roller.
1. OPC Drum scar
2. OPC Drum damage
1. Contamination of LSU window
1. OPC Drum scar or particle
2. Heat roller scar or particle
3. Develope roller scar or particle
4. Charge roller scar or particle
1. OPC Drum scar or particle
2. Check the cartridge life
Troubleshooting
Solution
1. Refer to HVPS output spec
- Replace the engine board
- Refer to "4 - 11"
2. Fix the terminal to contact well.
1. Replace image cartridge.
2. Refor to HVPS output spec.
-Replace the engine board.
3. Fix the terminal to contact well.
1. Replace image cartridge
2. Replace transfer roller
1. Clean Fuser Unit or change
If not improved, replace it.
2. Clean Heat Roller
- Refer to "4-5"
3. Clean OPC Drum.
If not improved, replace image
cartridge.
1. Clean Fuser Unit.
If not improved, replace it.
- Refer to "4-5"
2. Replace Transfer Roller
3. Remove the contamination on
paper path.
1. Refer to HVPS output spec
- Replace the engine board
2. Replace the image cartridge
3. Clean the lens with a soft
dry cloth
4. Fix the terminal to contact well.
5. Relpace Transfer Roller
1. Clean OPC Drum
2. Replace image cartridge
1. Clean LSU window
2. If not improved,
replace image cartridge
1. Clean OPC Drum & roller
2. Cleaning heat roller
3. Clean the develope roller.
If not improved,
replace image cartridge.
4. Clean the charge roller.
If not improved,
replace image cartridge.
1. Clean OPC Drum
2. Replace image cartridge
5-1