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TROUBLESHOOTING & REPAIR
F-6 F-6
CLASSIC I
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 1-800-833-9353.
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
OUTPUT PROBLEMS
The welding output varies abnor-
mally. The auxiliary output remains
constant. The engine is operating
correctly.
1. Check for loose or faulty weld-
ing cables.
2. This may be a normal condition.
The machine will normally lose
some output as the components
are heated.
3. Check for loose, worn, dirty or
poorly seated main DC genera-
tor brushes.
4. The main armature commutator
may need cleaning.
1. Check the fine current control
field rheostat for resistance and
proper operation. Normal resis-
tance is 64 ohms. Check asso-
ciated wires for loose or faulty
connections. See the Wiring
Diagram.
2. Perform the Main Generator
Shunt Field Winding Test.
3. Check the current range
selector switch and contacts for
proper operation.
4. While the machine is loaded,
check the interpole and series
coils for signs of “arcing.” This
condition would indicate short-
ed turns in the “arcing” coil.
5. The main armature may be
faulty. Check for grounds.
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