Brother DCP-7080 Service Manual page 112

 Fogging
Step
New toner sensor PCB failure
1
High-voltage power supply PCB
2
failure
Main PCB failure
3
Note:
• This problem tends to occur when the life of the drum unit or toner cartridge is expiring.
<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.
Cause
2-77
Remedy
Replace the new toner sensor PCB ASSY.
Replace the high-voltage power supply PCB
ASSY.
Replace the main PCB ASSY.
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