Brother HL-1112 - Poor Fixing; Completely Blank

1-21
Confidential
4.2.4 Poor fixing
4.2.5 Completely blank
<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.
Step Cause Remedy
1 Fuser unit failure Replace the fuser unit.
2
High voltage power supply PCB
failure
Replace the high voltage power supply PCB
ASSY.
3 Laser unit failure Replace the laser unit.
4 Main PCB failure Replace the main PCB ASSY.
5
Low voltage power supply PCB
failure
Replace the low voltage power supply PCB
unit.
<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.
Step Cause Remedy
1
Dirt on electrodes of the drum unit
and those of the machine, and dirt
on ground wire.
Clean the electrodes of the drum unit and
those of the machine, and the grounding
wire. (Refer to Fig. 1-6 or Fig. 1-7.)
2 Laser unit attachment failure Reattach the laser unit.
3
Connection failure of the laser unit
flat cable
Reconnect the laser unit flat cable.
4
Connection failure of the high
voltage PCB flat cable
Reconnect the high voltage PCB flat cable.
5
Disconnection of the laser unit flat
cable
Replace the laser unit flat cable.
6 Laser unit failure Replace the laser unit.
7
High voltage power supply PCB
failure
Replace the high voltage power supply PCB
ASSY.
8 Main PCB failure Replace the main PCB ASSY.