Samsung SCX-5935FN Service Manual page 118

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Error Status
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Dark image
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Background
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Ghost
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Stains on back of
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paper
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Poor Fusing
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Partial blank image
(not periodic)
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Service Manual
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Alignment & Troubleshooting
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Check
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1. LSU light power normal?
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2. Bias voltage output is high?
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3. Video data is always supplied?
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4. Bad high charge voltage contact. Digital Printer
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1. High voltage output is normal?
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1. High voltage output.
2. Pre-Transfer Lamp.
3. Bad high voltage contact.
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1. Contamination of transfer roller.
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2. Stains of paper path.
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3. Pressure roller's contamination.
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1. Use recommended paper?
2. Check fusing temperature.
3. The machine was under the low
tempera ture for a long time?
1. Toner is low?
2. The toner cartridge is out of position?
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1. Check the rated level and replace.
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2. Set to power rating.
3. Replace defected board.
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4. Check the charge voltage or change
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the drum cartridge.
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1. Adjust to the rated status.
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1. Check every high voltage.
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2. Check the turn-on PTL, LED crash.
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3. Clean the inside machine or replace
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drum cartridge.
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1. Clean the transfer roller with vacuum
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cleaner.
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2. Clean the area of paper path with
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cloth or air cleaner.
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3. Remove fuser and replace it.
1. Should use recommended paper.
2. Check engine controller board. If you
have not thermometer, measure the
thermistor voltage to CPU, If 2.3V±5%
in printing CPU works well. Then,
disassemble fuser and check the
thermistor contact and thermistor.
3. Re-check after putting the machine in
the warm place for certain period.
1. Replace Toner cartridge.
2. Checkand adjust.
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Solution
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