Brother HL-S7000DN - 4.6 Troubleshooting on Operational Panel; 4.6.1 Nothing is displayed on the LCD.; 4.6.2 LED is not lit.; 4.6.3 Unable to perform panel operation

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4.6 Troubleshooting on Operational Panel
4.6.1 Nothing is displayed on the LCD.
4.6.2 LED is not lit.
4.6.3 Unable to perform panel operation
<User Check>
- Check whether the function lock is not set.
Step Cause Remedy
1 AC cord failure Replace the AC cord.
2 Panel PCB harness
connection failure
Check the connection of panel PCB harness
and reconnect the harness.
3 Panel key PCB harness
connection failure
Check the connection of panel key PCB
harness and reconnect the harness.
4 Panel key PCB failure Replace the top cover ASSY.
5 Power supply PCB failure Replace the power supply PCB ASSY.
6 Main PCB failure Replace the main PCB ASSY.
Step Cause Remedy
1 AC cord failure Replace the AC cord.
2 Panel key PCB harness
connection failure
Check the connection of panel key PCB
harness and reconnect the harness.
3 LED harness connection
failure
Check the connection of LED harness and
reconnect the harness.
4LED failure Replace the top cover ASSY.
5 Power supply PCB failure Replace the power supply PCB ASSY.
6 Main PCB failure Replace the main PCB ASSY.
Step Cause Remedy
1 Panel unit installation failure Reinstall the panel unit.
2 Panel key PCB harness
connection failure
Check the connection of panel key PCB
harness and reconnect the harness.
3 Panel key PCB failure Replace the top cover ASSY.
4 Power supply PCB failure Replace the power supply PCB ASSY.
5 Main PCB failure Replace the main PCB ASSY.