Lincoln Electric CLASSICII SVM125-A Service Manual page 56

F-6
Observe Safety Guidelines
detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
The welding output varies abnor-
mally. The auxiliary output remains
constant. The engine is operating
correctly.
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.
TROUBLESHOOTING & REPAIR
POSSIBLE AREAS OF
MISADJUSTMENT(S)
OUTPUT PROBLEMS
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.
CAUTION
CLASSIC II
TROUBLESHOOTING GUIDE
RECOMMENDED
COURSE OF ACTION
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.
Wiring Diagram.
2. Perform the Shunt Field Wind-
ing Test.
3. Check the Current
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.
F-6
See the
Range