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Brother MFC8950DWT
Troubleshooting. 6. Control Panel Problems
6.1 Nothing is displayed on the LCD
Step |
Cause |
Remedy |
1 |
AC cord failure |
Replace the AC cord. |
2 |
Connection failure of the panel harness |
Check the connection of the panel harness, and reconnect it if necessary. |
3 |
Connection failure of the backlight harness |
Check the connection of the backlight harness, and reconnect it if necessary. |
4 |
Connection failure of the LCD harness |
Check the connection of the LCD harness, and reconnect it if necessary. |
5 |
LCD failure |
Replace the LCD. |
6 |
LCD flat cable or LCD ASSY failure |
Replace the LCD ASSY. |
7 |
Backlight PCB failure |
Replace the backlight PCB ASSY. |
8 |
Panel PCB failure |
Replace the panel PCB ASSY. |
9 |
Touch panel PCB failure |
Replace the touch panel PCB ASSY. |
10 |
Low-voltage power supply PCB failure |
Replace the low-voltage power supply PCB ASSY. |
11 |
Main PCB failure |
Replace the main PCB ASSY. |
6.2 Control panel is inoperable
User Check
- Check that the function lock is not set.
Step |
Cause |
Remedy |
1 |
Panel unit attachment failure |
Reattach the panel unit. |
2 |
Connection failure of the panel PCB harness |
Check the connection of the panel PCB harness, and reconnect it if necessary. |
3 |
Connection failure of the touch panel PCB harness |
Check the connection of the touch panel PCB harness, and reconnect it if necessary. |
4 |
Connection failure of the touch panel harness |
Check the connection of the touch panel harness, and reconnect it if necessary. |
5 |
Rubber key failure |
Replace the rubber key printed ASSY. |
6 |
Panel PCB failure |
Replace the panel PCB ASSY. |
7 |
Touch panel PCB failure |
Replace the touch panel PCB ASSY. |
8 |
Touch panel ASSY failure |
Replace the touch panel ASSY. |
9 |
Low-voltage power supply PCB failure |
Replace the low-voltage power supply PCB ASSY |
10 |
Main PCB failure |
Replace the main PCB ASSY. |