1. LSU light power normal?
2. Bias voltage output is high?
3. Video data is always supplied?
4. Bad high charge voltage contact.
1. Check the rated level and replace.
2. Set to power rating.
3. Replace defected board.
4. Check the charge voltage or change
the drum cartridge.
Background
1. High voltage output is normal?
2. C/R of drum cartridge is
contaminated?
1. Adjust to the rated status.
2. Replace drum cartridge.
Ghost
1. High voltage output.
2. Pre-Transfer Lamp.
3. Bad high voltage contact.
1. Check every high voltage.
2. Check the turn-on PTL, LED crash.
3. Clean the inside machine or replace
drum cartridge.
Stains on back of
paper
1. Contamination of transfer roller.
2. Stains of paper path.
3. Pressure roller’s contamination.
1. Clean the transfer roller with vacuum
cleaner.
2. Clean the area of paper path with
cloth or air cleaner.
3. Remove fuser and replace it.
Poor Fusing 1. Use recommended paper?
2. Check fusing temperature.
3. The machine was under the low
tempera ture for a long time?
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.
Partial blank image
(not periodic)
1. Toner is low?
2. The toner cartridge is out of position?
1. Replace Toner cartridge.
2. Checkand adjust.
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