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Confidential
4.2 Pitch Indicated in Roller Image
Image defects which occur periodically may be caused by a failure of the roller. By referring to
the table below, specify the cause based on the pitch indicated in the image of each roller.
4.3 Troubleshooting Image Defect
Image defect related problems are user recoverable if following the User Check items. If the
same problem occurs, follow each procedure in the order of the number described in the Step
column in the tables below.
â– Light on the whole page
No. Parts name The pitch which appears in the image
1 Develop roller 31 mm
2 Exposure drum 94 mm
3 Heat roller in the fuser unit 78 mm
4 Pressure roller in the fuser unit 78 mm
<User Check>
- Check the machine’s environment. High temperature and high humidity
or low temperature and low humidity conditions can cause this problem.
- If the whole page is light, toner save mode may be on. Turn off the toner
save mode.
- Replace the toner cartridge or drum unit with a new one.
- Adjust the color density from the control panel cover ASSY.
- Leave the machine for a while as the power remains ON.
Step Cause Check
Result
Remedy
1 HVPS control PCB
failure
Is the problem solved
after replacing the HVPS
control PCB ASSY?
Yes Replace the HVPS
control PCB ASSY.
2 High-voltage power
supply PCB failure
Is the problem solved
after replacing the
high-voltage power
supply PCB ASSY?
Yes Replace the
high-voltage power
supply PCB ASSY.
3 Engine PCB failure Is the problem solved
after replacing the
engine PCB ASSY?
Yes Replace the engine
PCB ASSY.
4 Main PCB failure Is the problem solved
after replacing the main
PCB ASSY?
Yes Replace the main PCB
ASSY.
5 LED head control
PCB failure
Is the problem solved
after replacing the LED
head control PCB ASSY?
Yes Replace the LED head
control PCB ASSY.
6 LED ASSY failure
Is the problem solved after
replacing the LED ASSY?
Yes Replace the LED ASSY.
7 Registration mark L
PCB failure
Is the problem solved
after replacing the
registration sensor
holder ASSY?
Yes Replace the
registration sensor
holder ASSY.
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