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TROUBLESHOOTING & REPAIR
F-41 F-41
IDEALARC DC-655
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THERMAL FAN/SNUBBER BOARD LED CHART
LED # LED FUNCTIONS AND INDICATIONS
(Machine is ON)
1 Indicates fan should be running.
2Indicates welding current is greater than 200 amps.
3 Indicates fan should be running due to heating of main
SCRs.
4 Indicates an open thermal fan thermistor or an open con-
nection between the thermistor and the thermal fan/snub-
ber board. See the Wiring Diagram (leads #319 and
#316).
5 Indicates a thermostat (choke or secondary) has opened.
The thermal protection light should also be illuminated.
6 Indicates the fan motor should be running. LED 6 should
be illuminated and the fan running when any
of the following LEDs are lit: LED 2, LED 3, LED 4, or
LED 5.