Brother MFC-7380

2-77
Confidential
 Fogging
<User Check>
- Check the usage environment of the machine. Using the machine in
hot-humid or cold-dry conditions can cause this problem.
- Check that the acid paper is not used.
- This problem may disappear after printing multiple sheets of paper.
- Replace the toner cartridge with a new one.
- Replace the drum unit with a new one.
Step Cause Remedy
1
New toner sensor PCB failure Replace the new toner sensor PCB ASSY.
2
High-voltage power supply PCB
failure
Replace the high-voltage power supply PCB
ASSY.
3
Main PCB failure Replace the main PCB ASSY.
Note:
• This problem tends to occur when the life of the drum unit or toner cartridge is expiring.