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TROUBLESHOOTING & REPAIR
F-6 F-6
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 input contactor operates – the
fan runs – the pilot light is lit – but
the machine has no welding out-
put.
1. If the amber thermal protection
light is lit, the primary or sec-
ondary thermostat is open.
Allow machine to cool.
2. Make certain the output trigger
circuit (#2 and #4) is being acti-
vated either by an external “clo-
sure” or by the output terminals
switch (S3).
3. Check the 10A circuit breaker in
the 42VAC line.
4. If remote control is not being
used, make certain the Output
Control switch (S2) is in the
OUTPUT CONTROL “LOCAL”
position.
5. Check for loose or faulty weld
cable connections.
1. Perform the Main Transformer
Test.
2. Perform the SCR/Diode
Rectifier Bridge Test.
3. The control board may be
faulty. Replace.