Print Quality - Samsung SCX-5935FN Service Manual

4.2.4.3 Print Quality

Error Status
Vertical black line
and band
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Vertical white line
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No image
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Light image
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Service Manual
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Alignment & Troubleshooting
Check
1. Bad blade of Toner cartridge
2. LSU
3. Bad cleaning blade of drum cartridge.
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1. LSU window contamination
2. Toner cartridge
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1. GND OPC is well grounded?
2. LSU running well?
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3. Bias voltage is normal?
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4. Lower toner?
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5. Is there video data from Main PBA
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1. LSU light power normal?
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2. Enough toner?
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3. High charger voltage?
4. Lower bias voltage
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5. Contamination of high voltage
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contact.
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6. Transfer volatge and roller.
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1. Change Toner cartridge
2. Replace LSU
3. Replace drum cartridge.
1. Clean LSU window
2. If not LSU, change Toner cartridge.
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1. 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
2. Adjust LSU or replace it
3. Normal Dev bias = -450V
4. Shake toner cartridge and print.If a
like good, toner is empty
5. Test engine test pattern , replace
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Main PBA
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1. LSU light power check is difficult.
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Compare with new one and check.
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2. Check toner and the toner cartridge
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counter 3~4. Measure all high voltage
output.
5. Leakage toner cause bad contact and
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increase contact resistance. Clean
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contaminated area.
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Solution
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