Image Distortion - Brother DCP-L5500D Service Manual

 Image distortion
Step
1 Laser unit attachment failure
2 Laser unit failure
3 Main PCB failure
 All black
Step
Dirt on the electrodes of the drum
1 unit and those of the machine
2 Laser unit flat cable failure
Dirt on the electrodes of the
3
machine
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
2-99
Remedy
Reattach the laser unit.
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. 2-9.)
Replace the laser unit flat cable.
Clean the electrodes of the machine.
(Refer to Fig. 2-9.)
Replace the high-voltage power supply PCB
ASSY.
Replace the laser unit.
Replace the main PCB ASSY.
Fig. 2-8 and
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