Brother DCP-L8400CDN Service Manual page 141

■
Ghost
< User Check >
- Check the machine's environment. High temperature and high humidity
- Check whether appropriate paper type is selected on the driver.
- Select "Improve Toner Fixing Mode" in the driver.
- Make a print in the color mode.
- Replace the drum unit with a new one.
Step
Scratch and dirt on fuser unit
1
High-voltage power supply
2
PCB failure
■
Inter-color position alignment
< User Check >
- Implement the adjustment of color registration (adjustment of inter-color
- Replace the belt unit with a new one.
- Replace the drum unit with a new one.
- Replace the waste toner box with a new one.
Step
Registration mark sensor L or
1
registration mark sensor R
failure
Main PCB failure
2
■
Fogging
< User Check >
- Check the machine's environment. High temperature and high humidity
- Check if the acid paper is not used.
- This symptom might stop occurring after making several prints.
- Replace the toner cartridge with a new one.
- Replace the drum unit with a new one.
Step
Toner/new sensor PCB failure
1
High-voltage power supply
2
PCB failure
Main PCB failure
3
Note:
This problem often occurs when the drum unit or toner cartridge is nearly at the end of life.
or low temperature and low humidity conditions can cause this problem.
Cause
position alignment).
Cause
or low temperature and low humidity conditions can cause this problem.
Cause
2-111
Remedy
Replace the fuser unit.
Replace the high-voltage power supply PCB
ASSY.
Remedy
Replace the registration mark sensor unit.
Replace the main PCB ASSY.
Remedy
Replace the toner/new sensor PCB ASSY.
Replace the high-voltage power supply PCB
ASSY.
Replace the main PCB ASSY.
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