6-3
Symptoms Possible Cause Corrective Action
Touchscreen does not
respond.
Touchscreen disabled
Check if there is a
symbol displayed above the [Main
Menu] quickkey. If yes, press and hold the [Main Menu]
quickkey for more than 3 seconds to enable the
touchscreen.
Cable defective 1. Check that the cable between the touchscreen and
touchscreen control board is correctly connected.
2. Check that the cable between the touchscreen control
board and main board is correctly connected.
Touchscreen control board defective Replace the touchscreen control board
Touchscreen defective Replace the touchscreen.
The main board failed. Replace the main board.
Touch position invalid Touchscreen not calibrated Calibrate the touchscreen.
6.6.3 Alarm Lamp Failures
Symptoms Possible Cause Corrective Action
The alarm lamp is not
light or extinguished,
or the alarm lamp
illuminates
abnormally.
Cable defective 1. Check that the cable between the alarm lamp board and main
board is correctly connected.
2. Check that the cables and connectors are not damaged.
Alarm lamp board defective Replace the alarm lamp board
The main board failed. Replace the main board.
6.6.4 Button and Knob Failures
Symptoms Possible Cause Corrective Action
Buttons do not work Cable defective Check that the cable between the keypad board and main board is
correctly connected.
Keypad board failure Replace the keypad board.
Knob does not work Cable defective 1. Check that the cable between the knob and keypad board is
correctly connected.
2. Check that the cable between the keypad board and main
board is correctly connected.
Knob failure Replace the knob encoder.
Keypad board failure Replace the keypad board.
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