Brother HL-5580D, Service Manual

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2-102
Confidential

Image distortion
 All black
Step Cause Remedy
1 Laser unit attachment failure Reattach the laser unit.
2 Laser unit failure Replace the laser unit.
3 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 the 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. 2-6 and
Fig. 2-7 .)
2 Laser unit flat cable failure Replace the laser unit flat cable.
3
Dirt on the electrodes of the
machine Clean the electrodes of the machine.
(Refer to
Fig. 2-7 .)
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.