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8-2. FAULT DIAGNOSIS AND TROUBLESHOOTING
1. Be careful of electric shock if disconnecting parts while troubleshooting.
2. First of all, check the connection of each electrical terminal with the wiring diagram.
3. If you replace the MAIN PWB ASSEMBLY, reinsert the connectors correctly.
CAUTION
NO POWER
Is the supplied voltage 120V AC?
Check the fuse or reset
the circuit breaker.
YES
NO
Is the voltage between the 2 FILTER
ASSEMBLY connectors 120V AC?
Replace the FILTER
ASSEMBLY (CIRC).
YES
NO
Is the LED(1) on?
Replace MAIN PWB
ASSEMBLY.
YES
NO
Are the connectors(2) on the PWB loose?
Is wire of the DISPLAY PWB ASSEMBLY
broken?
Replace DISPLAY PWB ASSEMBLY or repair
wire.
Reconnect.
Replace the MAIN
PWB ASSEMBLY.
NO
YES
YES
NO
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