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TROUBLESHOOTING & REPAIR
F-5 F-5
IDEALARC CV-400
TROUBLESHOOTING GUIDE Observe Safety Guidelines
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 on - but
the machine has no welding output.
The input contactor (CR1) chatters.
1. If the amber thermal protection
light is on, 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 by a “closure.”
3. Check the 10 amp circuit break-
er in the 42VAC circuit. Reset if
necessary.
4. If remote control is not being
used, make certain the Output
Control switch (S2) is in the
“Machine or Local” position.
5. Check for loose or faulty welding
cable connections.
1. Make certain the three-phase
input voltage matches the
machine rating plate and the
reconnect panel.
1. Perform the
Main Transformer
Test.
2. Perform the
SCR/Diode Recti-
fier Bridge Test.
3. The control board may be faulty.
Replace.
1. Perform the
Input Contactor
Test.