Lincoln Electric IDEALARC DC-1000 Service Manual page 65

F-31
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 ter-
minals or the remote control circuit (leads #73,
#74, # 75, #76 and #77) may be shorted to the
negative welding voltage. Check the weld out-
put terminals and associated leads and also the
remote control circuitry. See Wiring Diagram.
2. If the above procedures do not reveal the prob-
lem, then the Control board may be faulty-
Replace.
TROUBLESHOOTING AND REPAIR
CONTROL BOARD TEST (continued)
IDEALARC
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 cir-
cuitry.
® DC-1000
F-31