You may be able to determine the remedies against Main Controller-related troubles by
checking the lighting status of LEDs on the PCB.
■ Location of LEDs
LED1 Green
LED9 Green
LED16 Green
Main Controller PCB 1
Riser PCB
■ Preconditions
■
Check whether the Main Controller PCB 1 and the Main Controller PCB 2 are properly
inserted.
Check whether the connectors are securely connected. LEDs are not lit when the contaction
is poor. (Power-on is not possible)
When the LED of the Control Panel main power is not lit, check the connection of cables (such
as UI Cable).
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Troubleshooting > Controller Self Diagnosis > Operation Check of the Main Controller LEDs > Checking the lighting of the LED4 RED on the Main Controller 2
LED 4 Red
Main Controller PCB 2
F-6-166
6
Troubleshooting > Controller Self Diagnosis > Operation Check of the Main Controller LEDs > Checking the lighting of the LED4 RED on the Main Controller 2