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TROUBLESHOOTING & REPAIR
F-7 F-7
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 machine does not have maxi-
mum output.
1. Make sure the correct three-
phase input voltage is being
applied to the machine.
2. If remote control is being used,
set the Output Control switch
(S2) to the “Machine or Local”
position and control the weld
output with the machine Output
Control (R4). If the problem is
solved, check the remote control
unit or wire feeder and associat-
ed control cable.
1. Check the Output Control (R4).
Normal resistance is 10,000
ohms. Also check associated
wiring for loose or faulty connec-
tions. See the Wiring Diagram.
2. Check the Output Control switch
(S2) and associated wiring. See
the Wiring Diagram.
3. Perform the
Main Transformer
Test.
4. Perform the
SCR/Diode Bridge
Rectifier Test.
5. The control board may be faulty.
Replace.
The machine will not shut off when
the power switch is put in the OFF
position.
1. Make sure the three-phase input
lines are connected correctly to
the CV-400.
1. Check the input power switch
(S1) and associated leads. See
the Wiring Diagram.
2. Perform the
Input Contactor
Test.