Brother HL-L8250CDN Service Manual page 116

■
Completely blank
<User Check>
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 Connection failure of the laser
unit flat cable
5 Laser unit flat cable failure
6 Dirt on the electrodes of the
high-voltage power supply
PCB
7 Laser unit failure
8 Main PCB failure
■
Image distortion
<User Check>
Step
1 Laser unit installation failure
2 Laser unit failure
3 Main PCB failure
- Clean the corona wire of all four colors on the drum unit.
- Replace the drum unit with a new one.
- Replace the toner cartridge with a new one.
- Install the latest firmware.
Cause
- Replace the belt unit with a new one.
Cause
2-93
Remedy
Clean the electrodes of the main body and
the drum unit.
(Refer to Fig. 2-5 (P2-55),
Clean the electrodes of the main body and
the toner cartridge.
(Refer to Fig. 2-5 (P2-55),
Clean the electrodes of the main body and
the belt unit.
(Refer to Fig. 2-5 (P2-55),
Reconnect the laser unit flat cable.
Replace the laser unit flat cable.
Clean the electrodes of the high-voltage
power supply PCB.
Replace the laser unit.
Replace the main PCB ASSY.
Remedy
Re-assemble the laser unit.
Replace the laser unit.
Replace the main PCB ASSY.
Fig. 2-6 (P2-55).)
Fig. 2-8 (P2-90).)
Fig. 2-9 (P2-91).)
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