Brother MFC-8952DW - Image Distortion

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