Brother HL-1112 - Image Distortion; All Black

1-22
Confidential
4.2.6 Image distortion
4.2.7 All black
Step Cause Remedy
1
Laser unit attachment failure Reattach the laser unit, and firmly tighten
the screws.
2
Dirt on high-voltage electrodes and
electrodes of the machine
Clean the high-voltage electrodes and
electrodes of the machine.
3
Laser unit FG plate attachment
failure (not grounded correctly)
Retighten the screws to secure the laser unit
FG plate.
4 Laser unit failure Replace the laser unit.
5 Main PCB failure Replace the main PCB ASSY.
<User Check>
- Clean the corona wire of the drum unit.
- Replace the drum unit with a new one.
Step Cause Remedy
1
Dirt on electrodes of the drum unit
and those of the machine
Clean the electrodes of the drum unit and
those of the machine. (Refer to Fig. 1-6 or
Fig. 1-7.)
2
Connection failure of the laser unit
flat cable
Reconnect the laser unit flat cable.
3
Laser unit FG plate attachment
failure (not grounded correctly)
Check the contact of the laser unit FG plate,
and retighten the screws.
4
High voltage power supply PCB
failure
Replace the high voltage power supply PCB
ASSY.
5 Laser unit failure Replace the laser unit.
6 Main PCB failure Replace the main PCB ASSY.