Brother MFC-8380DN - Page 141

3-50
Confidential
■ Dark
<User Check>
- Check the machine's environment. High temperature and high
humidity conditions can cause this problem.
- Replace the drum unit with a new one.
- Replace the toner cartridge with a new one.
Step Cause Check
Result Remedy
1
Drum unit
electrode dirty
Is the electrode of the
drum unit dirty?
Yes
Clean the electrode.
2
Drum unit failure Is the problem solved
after replacing the drum
unit?
Yes
Replace the drum unit.
3
Developing bias
malfunciton
Is the problem solved
after reseting the
developer roller counter?
Yes
Reset the developer roller
counter.
4
HVPS PCB
failure
Is the problem solved
after replacing the
HVPS PCB ASSY?
Yes
Replace the HVPS PCB
ASSY.
5
Main PCB failure Is the problem solved
after replacing the main
PCB ASSY?
Yes
Replace the main PCB
ASSY.