Brother DCP-9055CDN Service Manual page 161

■ Inter-color position alignment
<User Check>
Step
1 Phase displacement of drum
gear
2 Registration mark sensor
PCB failure
3 Main PCB failure
■ Fogging
<User Check>
Step
1 Toner/New sensor PCB
failure
2 High-voltage power supply
PCB failure
3 Engine PCB failure
Note:
This problem often occurs when the drum unit or toner cartridge is nearly at the end of life.
- Implement the adjustment of inter-color position alignment from the
control panel.
- Replace the belt unit with a new one.
- Replace the drum unit with a new one.
Cause
- Do not use acid paper.
- Replace the toner cartridge with a new one.
- Replace the drum unit with a new one.
- Check the machine's environment. (If the machine is used in the high
humidity environment, this symptom is likely to occur.)
Cause
2-123
Remedy
Align the drum phase.
(Refer to "6. IF YOU REPLACE THE DRUM
DRIVE MOTOR" in Chapter
Replace the registration mark sensor holder
ASSY.
Replace the main PCB ASSY.
Remedy
Replace the Toner/New sensor PCB ASSY.
Replace the high-voltage power supply PCB
ASSY.
Replace the engine PCB ASSY.
4.)
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