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F-12 F-12
CLASSIC II
TROUBLESHOOTING & REPAIR
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
WELDING PROBLEMS
The welding arc is loud and spat-
ters excessively.
1. The current setting may be too
high for the electrode and
process.
2. The polarity may be wrong for
the electrode and process.
1. Check the engine speed. High
idle speed should be 1800
RPM.
2. Check the DC generator brush-
es for good commutation and
alignment. Contact the Lincoln
Electric Service Dept. at 1-216-
383-2531 or 1-800-833-9353
(WELD).
The welding arc frequently “pops
out.”
1. The Fine Current Control
Rheostat may be set too low for
the process and electrode.
2. Check the welding cables for
loose or faulty connections.
1. Check the engine speed. High
idle speed should be 1800
RPM.
2. The Current Range selector
switch may be faulty. Check for
proper operation.
3. Check the DC generator
brushes for good commutation
and alignment. Contact the
Lincoln Electric Service Dept. at
1-216-383-2531 or 1-800-833-
9353 (WELD).