Lincoln Electric IDEALARC DC 1000 SVM123-A Service Manual page 69

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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.
TROUBLESHOOTING & REPAIR
CONTROL BOARD TEST
IDEALARC DC-1000
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 DC-1000" position.
Also check the Output Control
Potentiometer and associated circuitry.
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