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TROUBLESHOOTING & REPAIR
F-4 F-4
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
Major physical or electrical dam-
age is evident when the sheet
metal cover(s) are removed.
1. Contact your local authorized
Lincoln Electric Field Service
Facility for technical assistance.
1. Contact the Lincoln Electric
Service Department, 216-383-
2531 or 1-800-833-9353
(WELD).
Machine is dead – no output – no
fan – no pilot light.
1. Make sure that the input Power
switch is in the “ON” position.
2. Check the three-phase input
voltage at the machine. Input
voltage must match the rating
plate and the reconnect panel.
3. Check for blown or missing
fuses in the input lines.
1. Check the Power switch (S1) for
proper operation.
2. Check the leads associated
with the Power switch (S1) and
the control transformer (T2) for
loose or faulty connections.
See Wiring Diagram.
3. Perform the Control Trans-
former Test.