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Confidential
4.6
Troubleshooting for Control Panel Problems
4.6.1
Nothing is displayed on the LCD
< User Check >
- Turn the power OFF/ON.
Step
Cause
Remedy
1
The version of the panel
firmware and the main
firmware do not match.
Install the latest panel firmware and main
firmware.
2
Connection failure of the key
PCB flat cable
Reconnect the key PCB flat cable.
3
Connection failure of the
panel PCB harness
Reconnect the panel PCB harness.
4
Connection failure of the LCD
flat cable
Reconnect the LCD flat cable.
5
Connection failure of the
low-voltage power supply
PCB harness
Reconnect the low-voltage power supply
PCB harness.
6
AC cord failure
Replace the AC cord.
7
Panel PCB failure
Replace the panel PCB unit.
8
LCD failure
Replace the LCD.
9
Key PCB failure
Replace the panel cover ASSY.
10
Low-voltage power supply
PCB failure
Replace the low-voltage power supply PCB
unit.
11
Main PCB failure
Replace the main PCB ASSY.
Содержание DCP-L8400CDN
Страница 38: ...2 8 Confidential 2 2 2 Scanning part Fig 2 4 Right side Left side Face up Document scanning feed path ...
Страница 249: ...3 85 Confidential 3 Remove the ADF spring from the Upper ADF chute Fig 3 95 ADF spring Upper ADF chute ...
Страница 277: ...3 113 Confidential 9 35 LCD 1 Remove the LCD from the Control panel ASSY Fig 3 145 Control panel ASSY LCD ...
Страница 391: ...5 7 Confidential Common to first and second side Fig 5 1 ...