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Confidential
4.6 Troubleshooting for Control Panel Problems
4.6.1 Nothing is displayed on the LCD
4.6.2 Control panel is inoperable
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 ASSY failure Replace the backlight 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.
<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 R, L or C.
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.
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