Brother MFC-7450

1-42
Confidential
■ Ghost
■ Fogging
CAUTION:
This problem often occurs when the drum unit or toner cartridge is nearly at the end of life.
User Check
• Check the machine's environment, conditions such as high or low
humidity may cause this situation to occur.
• Check that the appropriate media type or size is selected in the
printer driver.
• Replace the drum unit with a new one.
Step Cause Check
Result Remedy
1
Dirt on cleaner
electrode
Are the electrodes of the
drum unit and machine
body dirty?
Ye s
Clean both electrodes.
(Refer to Fig. 1-1, Fig. 1-2.)
2
HVPS PCB
failure
Is the problem solved
after replacing the
HVPS PCB ASSY?
Ye s
Replace the HVPS PCB
ASSY.
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 Check
Result Remedy
1
Toner sensor
failure (Machine
body)
Is the toner sensor
performed normally by
following the procedure
in "Maintenance mode
32" (Chapter 5).
No
Replace the toner sensor
PCB unit ASSY and the
toner LED PCB ASSY.
2
HVPS PCB
failure
Is the problem solved
after replacing the
HVPS PCB ASSY?
Ye s
Replace the HVPS PCB
ASSY.
3
Main PCB failure Is the problem solved
after replacing the main
PCB ASSY?
Ye s
Replace the main PCB
ASSY.