Xerox WorkCentre Pro 412 Service Manual page 186

Maintenance & Troubleshooting
Error Status
Background
Ghost
Stains on back of paper
Poor Fusing
Partial blank image
(not periodic)
Partial blank image
(periodic)
Different image density
(left and right)
7-16
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 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. Developer roller scar or particle (repeated
every 94mm).
2. Transfer roller scar or particle (repeated
every 47mm).
1. Charge roller's pressure force unbalanced
2. Dev. roller and OPC or Dev. roller and
blade's pressure force unbalance
3. Transfer roller's pressure force unbalanced
each side
Solution
1. Adjust to the rated value.
2. Replace Toner cartridge.
1. Check every high voltage.
2. Check the turn-on PTL, LED crash.
3. Clean the inside of the machine or replace
toner cartridge.
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.
1. Should use recommended paper.
2. Check engine controller board.
If you have no thermometer, measure the
thermistor voltage to CPU, If 2.3V±5% in
printing CPU works well. Then, disassem-
ble fuser and check the thermistor contact
and thermistor.
3. Re-check after putting the machine in a
warm place for 2 hours
1. Replace Toner cartridge.
2. Check and adjust.
1. Replace toner cartridge.
2. Replace transfer roller.
1~2. Change toner cartridge
3. Check left and right spring of transfer roller
and the spring pressing the developer
inside the machine
3/03 WorkCentre Pro 412, FaxCentre F12 &
WorkCentre M15/M15i