Image Distortion; All Black - Brother HL-1110 Service Manual

4.2.6 Image distortion

Step
Laser unit attachment failure
1
Dirt on high-voltage electrodes and
2
electrodes of the machine
Laser unit FG plate attachment
3
failure (not grounded correctly)
4 Laser unit failure
5 Main PCB failure

4.2.7 All black

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