Brother MFC-9125CN - Page 175

3-83
Confidential
■ Fogging
<User Check>
- Replace the toner cartridge with a new one.
- Replace the drum unit with a new one.
- Do not use acid paper.
Step Cause Check
Result
Remedy
1 Toner/new
sensor PCB failure
Is the toner sensor
performed normally by
following the procedure
described in “Function
code 32” to check?
No Replace the toner/new
sensor PCB ASSY.
2 HVPS control PCB
failure
Is the problem solved
after replacing the HVPS
control PCB ASSY?
Yes Replace the HVPS
control PCB ASSY.
3 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.
4 Engine PCB failure Is the problem solved
after replacing the
engine PCB ASSY?
Yes Replace the engine
PCB ASSY.
Note:
This problem often occurs when the drum unit or toner cartridge is nearly at the end of life.