Control Panel Troubleshooting; Nothing Is Displayed On The Lcd; The Control Panel Does Not Work; Lamp Malfunction - Brother FAX-2840 Service Manual

3.10 Control Panel Troubleshooting

3.10.1 Nothing is displayed on the LCD

<User Check>
- Check that the power switch is turned ON.
Step
1 AC cord failure
Connection failure of the panel PCB
2
harness
Connection failure of the LCD
3
harness
4 LCD failure
Low voltage power supply PCB
5
failure
6 Panel PCB failure
7 Main PCB failure

3.10.2 The control panel does not work

<User Check>
- Turn the power OFF and ON.
Step
1 Panel unit attachment failure
Connection failure of the panel PCB
2
harness
3 Rubber key failure
4 Panel PCB failure
5 Main PCB failure

3.10.3 Lamp malfunction

Step
Connection failure of the panel PCB
1
harness
2 Panel PCB failure
3 Main PCB failure
Cause
Replace the AC cord.
Reconnect the panel PCB harness.
Reconnect the LCD harness.
Replace the LCD.
Replace the low voltage power supply PCB
ASSY.
Replace the panel PCB ASSY.
Replace the main PCB ASSY.
Cause
Reattach the panel unit.
Reconnect the panel PCB harness.
Replace the rubber key.
Replace the panel PCB ASSY.
Replace the main PCB ASSY.
Cause
Reconnect the panel PCB harness.
Replace the panel PCB ASSY.
Replace the main PCB ASSY.
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Remedy
Remedy
Remedy
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