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TROUBLESHOOTING & REPAIR
F-6 F-6
CLASSIC II
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 cleaned.
4. Check for loose or faulty weld-
ing cables.
1. Check the Fine Current Adjust-
ment rheostat for resistance
and proper operation. Normal
resistance is 64 ohms. Check
associated wires for loose or
faulty connections. See the
Wiring Diagram.
2. Perform the
Shunt Field Wind-
ing 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.