Confidential
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4.6 Control Panel Problems
4.6.1 No display on LCD
4.6.2 No display on LED
4.6.3 The control panel does not work
4.6.4 Touch panel inoperative
Step Cause Solution
1 AC cord defective Replace the AC cord.
2 Panel harness connection failure Check connection of the panel harness and re-
connect.
3 Control panel ASSY defective Replace the control panel ASSY.
4 Power supply PCB defective Replace the power supply PCB ASSY.
5 Main PCB defective Replace the main PCB ASSY.
Step Cause Solution
1 AC cord defective Replace the AC cord.
2 Panel harness connection failure Check connection of the panel harness and re-
connect.
3 Control panel ASSY defective Replace the control panel ASSY.
4 Power supply PCB defective Replace the power supply PCB ASSY.
5 Main PCB defective Replace the main PCB ASSY.
Step Cause Solution
1 Panel connection failure Check connection of the panel harness and re-
connect.
2 Control panel ASSY defective Replace the control panel ASSY.
3 Main PCB defective Replace the main PCB ASSY.
Step Cause Solution
1 Panel connection failure Check connection of the panel harness and re-
connect.
2 Adjustment slippage of the touch
panel
Perform the touch panel adjustment. (refer to
Chapter 5, Section 1.3.31.)
3 Control panel ASSY defective Replace the control panel ASSY.
4 Main PCB defective Replace the main PCB ASSY.
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