Color Misregistration - Brother HL-4040CN Service Manual

Color misregistration

User Check
- Implement the auto color registration by the panel operation.
- Replace the belt unit with a new one.
- Replace the drum unit with a new one.
- Replace the waste toner box with a new one.
Step Cause
1 Phase shift of
gear 39/121
2
Engine PCB
failure
Fogging
User Check
- Replace the toner cartridge with a new one.
- Replace the drum unit with a new one.
- Do not use acid paper.
- Check if there is dust or paper powder in the machine.
Step Cause
1 Toner sensor
failure (Machine
body)
2
Transfer HVPS
PCB failure
3 Charge HVPS
PCB failure
Note:
This problem often occurs when the drum unit or toner cartridge is nearly at the end of life.
Check
Check if gear 39/121
phase is shifted?
Is the problem solved
after replacing the engine
PCB ASSY?
Check
Is the toner sensor
performed normally by
following the procedure
described in
"Maintenance mode 32"
to check.
Is the problem solved
after replacing the
transfer HVPS PCB
ASSY?
Is the problem solved
after replacing the charge
HVPS PCB ASSY?
1-55
Remedy
Result
Yes Phase the Gear 39/121.
For the method how to
phase the gear 39/121,
refer to "Chapter 3
DISASSEMBLY AND
ASSEMBLY".
Yes Replace the engine PCB
ASSY.
Remedy
Result
No Replace the toner sensor
PCB (TE/NEW) of the
appropriate color.
Yes Replace the Transfer
HVPS PCB ASSY.
Yes Replace the charge
HVPS PCB ASSY.
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