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TROUBLESHOOTING & REPAIR
F-6 F-6
Classic III and IIID
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
The welding output varies abnor-
mally. The auxiliary output remains
constant. The engine is operating
correctly.
1. May be a normal condition. The
machine will normally lose
some output as the components
get heated.
2. Check for loose, worn, dirty, or
poorly seated DC generator
brushes.
3. The armature commutator may
need cleaning.
4. Check for loose or faulty welding
cables.
1. Check the Fine Current
Adjustment rheostat for resis-
tance and proper operation.
Normal resistance is 64 ohms.
Check associated wires for
loose or faulty connections. See
the Wiring Diagram.
2. Perform the
Field Shunt
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 point to shorted
turns in the “arcing” coil.
5. The main armature may be
faulty. Check for grounds.