Service manual

Troubleshooting
4-18
Samsung Electronics
4-6-3 Print Quality
Error Status Check Solution
Vertical black line and
band
1. Bad blade of Toner cartridge
2. LSU
1. Change Toner cartridge
2. Replace LSU
Vertical white line 1. LSU window contamination
2. Toner cartridge
1. Clean LSU window
2. If not LSU, change Toner cartridge.
No image 1. Seal tape is removed?
2. GND OPC is well grounded?
3. LSU running well?
4. Biss voltage is normal?
5. Lower toner?
6. Is there video data from Main PBA
1. Removing seal tipe
2. Measure the resistance between frame
ground and the ground spring attached
frame. Confirm stable ground. Unless bad
ground, detach cabinet, check where is
bad point
3.Adjust LSU or replace it
4. Normal Dev bias = -350V
5. Shake toner cartridge and print.If a liitke
good, toner is empty
6. Test engine test pattern , replace Main
PBA
Light image 1. Check seal tape removing
2. LSU light power normal?
3. Enough toner?
4. High charger voltage?
5. Lower bias voltage
6. Contamination of high voltage contact.
7. Transfer volatge and roller.
1. Check and remove tape
2. LSU light power check is difficult.
Compare with new one and check.
3. Check toner and developer counter
4~5. Measure all high voltage output.
6. Leakage toner cause bad contact and
increase contact resistance. Clean contami-
nated area.
Dark image 1. LSU light power normal?
2. Bias voltage output is high?
3. Video data is always supplied?
1. Check the rated level and replace.
2. Set to power rating.
3. Replace defected board.
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