Image Distortion - Brother DCP-8110DN Service Manual

Image distortion

Step
Laser unit attachment failure
1
Harness connection failure
2
Dirt on high-voltage electrodes and
3
electrodes of the machine
Laser unit earth plate attachment
4
failure (not grounded correctly)
5 Laser unit failure
6 Main PCB failure
All black
<User Check>
- Clean the corona wire.
- Replace the drum unit with a new one.
Step
Dirt on electrodes of the drum unit
1 and those of the machine, and dirt
on grounding wire
Connection failure of the laser unit
2
flat cable
Earth plate contact failure (not
3
grounded correctly)
High-voltage power supply PCB
4
failure
5 Laser unit failure
6 Main PCB failure
Cause
Attach the laser unit correctly, and firmly
tighten the screws.
Check the connection of all harnesses. If
faulty, reconnect them.
Clean the high-voltage electrodes and
electrodes of the machine.
Retighten the screws to secure the laser unit
earth plate.
Replace the laser unit.
Replace the main PCB ASSY.
Cause
Clean the electrodes of the drum unit and
those of the machine, and the grounding
wire. (Refer to
Reconnect the laser unit flat cable correctly.
Check the contact of the laser unit earth
plate, and retighten the screws.
Replace the high-voltage power supply PCB
ASSY.
Replace the laser unit.
Replace the main PCB ASSY.
2-76
Remedy
Remedy
Fig. 2-10 or Fig. 2-11.)
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