Troubleshooting According To Image Defect - Brother DCP-8110DN Service Manual

4.3.2 Troubleshooting according to image defect

End users can solve problems related to image defects as long as they follow the User
Check items. If the problem still cannot be solved, implement each procedure according to
the step number in the tables below.
Light
Step
Dirt on electrodes of the drum unit
1
Toner volume determination failure
2 when a new toner cartridge is
detected
Connection failure of the develop
3
clutch 51R harness
4 Develop clutch 51R failure
5 Fuser unit failure
High-voltage power supply PCB
6
failure
7 Laser unit failure
8 Main PCB failure
<User Check>
- Check the usage environment of the machine. Using the machine in
high temperature and humidity or low temperature and humidity
conditions can cause this problem.
- If the whole page is light, toner save mode may be ON. Turn OFF
the toner save mode.
- Adjust the density using the Density Adjustment.
- Replace the drum unit with a new one.
- Replace the toner cartridge with a new one.
Cause
2-72
Remedy
Clean the electrodes of the drum unit and
those of the machine. (Refer to
Fig. 2-11.)
Reset the developer roller counter. (Refer to
"2.4 Reset Developer Roller Counter" in
Chapter 5.)
Reconnect the develop clutch 51R harness.
Replace the develop clutch 51R.
Replace the fuser unit.
Replace the high-voltage power supply PCB
ASSY.
Replace the laser unit.
Replace the main PCB ASSY.
Fig. 2-10 or
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