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POWER-ARC 4000
F-7
TROUBLESHOOTING
F-7
TROUBLESHOOTING GUIDE - Observe all Safety Guidelines detailed throughout this manual
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact the
Lincoln Electric Service Department for technical troubleshooting assistance before you proceed. Call 1-800-833-9353
OUTPUT PROBLEMS
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENTS(S)
RECOMMENDED
COURSE OF ACTION
Low weld output and low auxiliary
output.
1. Perform the Rotor Voltage Test.
2. If the rotor voltage is low, the
field capacitor (C1) or bridge (D1)
may be faulty. Test or replace.
3. Check the rheostat (R1). Normal
resistance is 3.3 ohm. See the
Rheostat Replacement drawing.
4. The rotor may be faulty. Perform
the Rotor Resistance Test.
5. The engine RPM may be low.
Perform the Engine Throttle
Adjustment Test.
6. If engine idle RPM is okay, the
engine may have lost horsepow-
er and be in need of major
repair.
1. The generator brushes may be
worn. See the Maintenance sec-
tion of this manual or contact
your local Lincoln Electric
Authorized Field Service Facility.
2. The engine RPM may be low.
CAUTION
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