One Color Is Light - Brother DCP-9045CDN Service Manual

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
1 Dirt on exposure
drum electrode
2 Dirt on belt unit
electrode
3 Dirt on scanner
windows
4 Toner sensor
failure
5
6 Transfer HVPS
PCB failure
7 Charge HVPS
PCB failure
8 Engine PCB
failure
Check
Are the electrodes of the
drum unit and the
appropriate color and
machine body dirty?
Are the electrodes of the
belt unit and the
appropriate color and
machine body dirty?
Is the scanner windows of
the appropriate color
dirty?
After replacing the toner
cartridge of the
appropriate color with a
new one, does the same
problem occur even after
printing several pages?
Does the machine start
printing even after
removing the toner
cartridge of the
appropriate color from the
drum unit?
Is the problem solved after
replacing the transfer
HVPS PCB ASSY?
Is the problem solved after
replacing the charge
HVPS PCB ASSY?
Is the problem solved after
replacing the engine PCB
ASSY?
1-46
Remedy
Result
Yes Clean both electrodes.
Yes Clean both electrodes.
Yes Wipe the dirt off with a
soft, clean, lint free cloth.
No Replace the toner
cartridge of the
appropriate color.
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.
Yes Replace the transfer
HVPS PCB ASSY.
Yes Replace the charge
HVPS PCB ASSY.
Yes Replace the engine PCB
ASSY.
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