2-80
Confidential
4.6 Troubleshooting for Control Panel Problems
4.6.1 Nothing is displayed on the LCD
4.6.2 Nothing is displayed on the LED
<User Check>
- Turn the power switch OFF and then ON again.
Step
Cause
Remedy
1
Rubber key attachment failure
(For models without touch panel)
Reattach the rubber key.
2
Connection failure of the panel
harness
Reconnect the panel harness.
3
Connection failure of the key PCB
flat cable
(For models with touch panel)
Reconnect the key PCB flat cable.
4
Connection failure of the LCD flat
cable
Reconnect the LCD flat cable.
5
Connection failure of the LVPS
harness
Reconnect the LVPS harness.
6
Power cord failure
Replace the power cord.
7
Rubber key failure
(For models without touch panel)
Replace the panel unit.
8
Panel PCB failure
Replace the panel PCB ASSY.
9
Key PCB failure
(For models with touch panel)
Replace the panel unit.
10
LCD failure
(For models without touch panel)
Replace the LCD.
11
Low-voltage power supply PCB
failure
Replace the low-voltage power supply PCB
ASSY.
12
Main PCB failure
Replace the main PCB ASSY.
<User Check>
- Turn the power switch OFF and then ON again.
Step
Cause
Remedy
1
Connection failure of the panel
harness
Reconnect the panel harness.
2
Panel PCB failure
Replace the panel PCB ASSY.
3
Main PCB failure
Replace the main PCB ASSY.