GENERAL SERVICE PROCEDURES
Refer to quick check guide first before working on charger or removing cover. The obvious is often
missed.
If unable to diagnose from quick check, unplug AC and DC connectors, and remove cover. Carefully
inspect for damaged, discolored components and loose or discolored wiring. If unable to spot
problem, proceed to DC Circuit Checkout Procedure.
Quick Check Guide
Charger does not come on - no transformer hum with charger unplugged:
- check AC voltage to charger
- check circuit breaker
- check for continuity through DC fuse
- check DC plug and receptacle for good connection
- check for loose component/wire connections
PROBLEM
THIS MEANS
YOU SHOULD
AC circuit breaker
Abnormal voltage
Reset
trips
or current spikes
AC voltage switch
Correct switch
in wrong position
or wrong supply
voltage
AC circuit breaker
Possible wrong
Have qualified
trips after reset
circuit breaker or
service technician
transformer or SCR
inspect.
DC fuse/breaker blows
SCR short, circuit
Same as above
board malfunction
