3-65
Confidential
â– Dark
<User Check>
- Check the machine’s environment. High temperature and high humidity
or low temperature and low humidity conditions can cause this problem.
- Clean the corona wire.
- Replace the toner cartridge or drum unit with a new one.
- Adjust the color density from the control panel cover ASSY.
Step Cause Check
Result
Remedy
1 Corona wire
conduction failure
Are the electrodes on
the drum unit and
machine body dirty?
Yes Clean both electrodes.
(Refer to Fig. 3-3
(P3-33) and Fig. 3-6
(P3-34))
2 Dirt on belt unit
electrode
Are the electrodes on
the belt unit and
machine body dirty?
Yes Clean both electrodes.
(Refer to Fig. 3-4
(P3-33) and Fig. 3-6
(P3-34))
3 HVPS control PCB
failure
Is the problem solved
after replacing the HVPS
control PCB ASSY?
Yes Replace the HVPS
control PCB ASSY.
4 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.
5 Engine PCB failure Is the problem solved
after replacing the
engine PCB ASSY?
Yes Replace the engine
PCB ASSY.
6 Main PCB failure Is the problem solved
after replacing the main
PCB ASSY?
Yes Replace the main PCB
ASSY.
7 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.
8 Registration mark L
PCB failure
Is the problem solved
after replacing the
registration sensor
holder ASSY?
Yes Replace the
registration sensor
holder ASSY.
9 Toner/new
sensor PCB failure
Is the problem solved
after replacing the
toner/new sensor PCB
ASSY?
Yes Replace the toner/new
sensor PCB ASSY.
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