Poor Fixing; Completely Blank - Brother HL-1110 Service Manual

4.2.4 Poor fixing

Step
1 Fuser unit failure
High voltage power supply PCB
2
failure
3 Laser unit failure
4 Main PCB failure
Low voltage power supply PCB
5
failure

4.2.5 Completely blank

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