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F-12 F-12
CLASSIC I
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 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 1600
RPM. If necessary perform the
Engine Throttle Adjustment
Test.
2. Check the main DC generator
brushes for good commutation
and alignment. Contact the
Lincoln Electric Service Dept. at
1-800-833-9353 (WELD).
The welding arc frequently “pops
out.”
1. The fine current control field
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 1600
RPM. If necessary perform the
Engine Throttle Adjustment
Test.
2. The current range selector
switch may be faulty. Check for
proper operation and contact.
3. Check the DC generator brushes
for good commutation and align-
ment. Contact the Lincoln
Electric Service Dept. at 1-800-
833-9353 (WELD).
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