Brother HL-L5000D Service Manual page 127

 Poor fixing
Step
Dirt on the electrodes of the toner
1 cartridge and those of the machine
2 Fuser unit failure
High-voltage power supply PCB
3
failure
Low-voltage power supply PCB
4
failure
5 Laser unit failure
6 Main PCB failure
 Completely blank
Step
Dirt on the electrodes of the drum
1 unit and those of the machine
Dirt on the electrodes of the toner
2 cartridge and those of the machine
Connection failure of the laser unit
3
flat cable
4 Laser unit attachment failure
5 Laser unit flat cable failure
Dirt on the electrodes of the
6
machine
7 Laser unit failure
8 Main PCB failure
<User Check>
- Check the usage environment of the machine. Using the machine in
hot-humid or cold-dry conditions can cause this problem.
- Clean the corona wire of the drum unit.
- Replace the drum unit with a new one.
- Replace the toner cartridge with a new one.
Cause
<User Check>
- Clean the corona wire of the drum unit.
- Replace the drum unit with a new one.
- Replace the toner cartridge with a new one.
- Install the latest main firmware.
Cause
2-101
Remedy
Clean the electrodes of the toner cartridge
and those of the machine. (Refer to
and Fig. 2-7.)
Replace the fuser unit.
Replace the high-voltage power supply PCB
ASSY.
Replace the low-voltage power supply PCB
ASSY.
Replace the laser unit.
Replace the main PCB ASSY.
Remedy
Clean the electrodes of the drum unit and
those of the machine. (Refer to
Fig. 2-7.)
Clean the electrodes of the toner cartridge
and those of the machine. (Refer to
and Fig. 2-7.)
Reconnect the laser unit flat cable.
Reattach the laser unit.
Replace the laser unit flat cable.
Clean the electrodes of the machine.
(Refer to Fig. 2-7.)
Replace the laser unit.
Replace the main PCB ASSY.
Fig. 2-6
Fig. 2-6 and
Fig. 2-6
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