Lincoln Electric SHIELD-ARC SVM128-A Service Manual page 66

F-12
TROUBLESHOOTING GUIDE
PROBLEMS
(SYMPTOMS)
The welding arc is loud and spat-
ters excessively.
The welding arc frequently "pops
out."
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)
WELDING PROBLEMS
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. The Fine Current Control rheo-
stat may be set too low for the
process and electrode.
2. Check the welding cables for
loose or faulty connections.
CAUTION
SA-250
Observe Safety Guidelines
detailed in the beginning of this manual.
RECOMMENDED
COURSE OF ACTION
1. Check the engine speed. High
idle speed should be 1800
RPM.
2. Check the DC generator brush-
es for good commutation and
alignment. Contact the Lincoln
Electric Service Dept. 1-216-
383-2531 or 1-800-833-9353
(WELD).
3. Check for shorted series coils.
1. Check the engine speed. High
idle speed should be 1800
RPM.
2. The Current Range Selector
switch may be faulty. Check for
proper operation.
3. Check the DC generator brush-
es for good commutation and
alignment. Contact the Lincoln
Electric Service Dept. 1-216-
383-2531 or 1-800-833-9353
(WELD).
F-12