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TROUBLESHOOTING & REPAIR | ||
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CONTROL BOARD TEST
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IF LED 3 does not light when the
Start Button is depressed (but LED 1 does light).
The Fault Protection Relay (2CR) is not receiving supply voltage (24 VDC) and the Input Contactor (1CR) will not stay closed. Check to see if LED 4 lights or “flickers” when the Start Button is held in.
If LED 4 lights,
1.There may be a “short” at the welder output terminals or the remote control circuit (leads #73, #74, # 75, #76 and #77) may be shorted to the negative welding voltage. Check the weld output ter- minals and associated leads and also the remote control circuitry. See wiring diagram.
2.If the above procedures do not reveal the problem, then the Control board may be faulty- Replace.
IF LED 5 does not light and varies in brightness when #2 and #4 are jumpered together, while the Output Control Potentiometer is rotated .
The Control Board may be faulty- Replace.
NOTE: The Weld Mode Switch (SW4) must be in the CV position and the Output Control Switch (SW3) in the “Output Control at
