Troubleshooting For Laser Unit Problems; Laser Unit Failure - Brother HL-5440D Service Manual

4.9

Troubleshooting for Laser Unit Problems

4.9.1 Laser unit failure

<User Check>
- Turn ON the power switch, and open the front cover and the back cover. Leave the
machine for a while to remove condensation.
Step
Earth plate contact failure
1
Connection failure of the laser unit
2
flat cable
3 Laser unit failure
4 Main PCB failure
Cause
Check the contact of the laser unit earth
plate, and retighten the screws.
Check the proper connection of the laser
unit flat cable, and reconnect it if necessary.
Replace the laser unit.
Replace the main PCB ASSY.
2-78
Remedy
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