Confidential
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One color is light
User Check
- Check the machine’s environment. High temperature and high humidity conditions can cause
this problem.
- Replace the toner cartridge or drum unit with a new one.
- Implement calibration from the control panel.
Step Cause
Check Result Remedy
1 Dirt on exposure
drum electrode
Are the electrodes of the
drum unit and the
appropriate color and
machine body dirty?
Yes Clean both electrodes.
2 Dirt on belt unit
electrode
Are the electrodes of the
belt unit and the
appropriate color and
machine body dirty?
Yes Clean both electrodes.
3 Dirt on scanner
windows
Is the scanner windows of
the appropriate color
dirty?
Yes Wipe the dirt off with a
soft, clean, lint free cloth.
4 After replacing the toner
cartridge of the
appropriate color with a
new one, does the same
problem occur even after
printing several pages?
No Replace the toner
cartridge of the
appropriate color.
5
Toner sensor
failure
Does the machine start
printing even after
removing the toner
cartridge of the
appropriate color from the
drum unit?
Yes - Clean the toner sensor
of the appropriate color.
- Check the harness
connection of the toner
sensor PCB ASSY
(TE/NEW) of the
appropriate color.
- Replace the toner
sensor PCB ASSY
(TE/NEW) of the
appropriate color.
6 Transfer HVPS
PCB failure
Is the problem solved after
replacing the transfer
HVPS PCB ASSY?
Yes Replace the transfer
HVPS PCB ASSY.
7 Charge HVPS
PCB failure
Is the problem solved after
replacing the charge
HVPS PCB ASSY?
Yes Replace the charge
HVPS PCB ASSY.
8 Engine PCB
failure
Is the problem solved after
replacing the engine PCB
ASSY?
Yes Replace the engine PCB
ASSY.
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