Brother HL-L8250CDN Service Manual page 113

■
One color is light
<User Check>
- Check the machine's environment. High temperature and high humidity or low temperature
and low humidity conditions can cause this problem.
- Adjust the color calibration from the control panel.
- Replace the drum unit with a new one.
- Replace the toner cartridge with a new one.
- Wipe the scanner windows of the laser unit of the appropriate color with a soft, lint-free cloth.
Step
1 Dirt on the electrodes of the
main body and the drum unit
2 Dirt on the electrodes of the
main body and the toner
cartridge
3 Dirt on the electrodes of the
main body and the belt unit
4 Dirt on the electrodes of the
high-voltage power supply
PCB
5 Density sensor failure
6 Fuser unit failure
7 High-voltage power supply
PCB failure
8 Main PCB failure
■
Electrodes location of the toner cartridge
Cause
Clean the electrodes of the main body and
the drum unit.
(Refer to
Clean the electrodes of the main body and
the toner cartridge. (Refer to
See the figure below.)
Clean the electrodes of the main body and
the belt unit.
(Refer to
Clean the electrodes of the high-voltage
power supply PCB.
Replace the registration mark sensor unit.
Replace the fuser unit.
Replace the high-voltage power supply PCB
ASSY.
Replace the main PCB ASSY.
Fig. 2-8
2-90
Remedy
Fig. 2-5 (P2-55), Fig. 2-6
Fig. 2-5
Fig. 2-5 (P2-55), Fig. 2-9
(P2-55).)
(P2-55),
(P2-91).)
Confidential