Samsung ML-920 Service Manual page 53

Troubleshooting
Error Status
Background
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Ghost
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Stains on back of paper
Poor Fusing
Partial blank image
(not periodic)
Partial blank image
(periodic)
4-16
Check
1. High voltage output is normal?
2. C/R of Toner cartridge is contaminated?
1. High voltage output.
2. Pre-Transfer Lamp.
3. Bad high voltage contact.
1. Contamination of transfer roller.
2. Stains of paper path.
3. Pressure roller's contamination.
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?
1. Develope roller scar or particle.
2. Scar or particle. (94 mm)
3. Transfer roller scar or particle .
(47 mm)
Solution
1. Adjust to the rated status.
2. Replace Toner cartridge.
1. Check every high voltage.
2. Check the turn-on PTL, LED crash.
3. Clean the inside machine or replace toner
cartridge.
1. Clean the transfer roller with vaccum
cleaner.
2. Clean the area of paper path with cloth or air
cleaner.
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.
1~2. Replace toner cartridge.
3. Replace transfer roller.
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