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TROUBLESHOOTING & REPAIR
F-8 F-8
LINCOLN
®
ELECTRIC
IDEALARC DC-400
Observe Safety Guidelines TROUBLESHOOTING GUIDE
detailed in the beginning of this manual.
CAUTION
If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con-
tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call
216-383-2531 or 1-800-833-9353.
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
OUTPUT PROBLEMS
The machine has minimum welding
output and no control.
1. If remote control is being used,
set the Output Control switch
(S2) in the OUTPUT CONTROL
“LOCAL” position and control
the weld output with the
machine Control potentiometer
(R4). If the problem is solved,
check the remote control unit
(or wire feeder) and associated
control cable.
2. Make certain the remote control
leads (#75, #76 and #77) are not
grounded to the positive weld-
ing output.
3. Make certain the three-phase
input voltage is correct and
matches the machine rating and
the reconnect panel.
1. Check the Output Control
potentiometer (R4) and associ-
ated wiring. See Wiring
Diagram.
2. Check the welding Mode switch
(S4), the microswitches, and the
associated wiring.
3. Check the Output Control
switch (S2) and associated
wiring. See Wiring Diagram.
4. Perform the Main Transformer
Test.
5. Perform the SCR/Diode Rec-
tifier Bridge Test.
6. The control board may be faulty.
Replace.