Lincoln Electric Pro-MIG 140 Operator's Manual page 29

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Observe all Safety Guidelines detailed throughout this manual
PROBLEMS
(SYMPTOMS)
Arc is unstable – Poor starting
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your
Local Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.
TROUBLESHOOTING
POSSIBLE
CAUSE
WELDING PROBLEMS
1. Check for correct input voltage
to machine – 115vac.
2. Check for proper electrode
polarity for process.
3. Check gun tip for wear or dam-
age and proper size – Replace.
4. Check for proper gas and flow
rate for process. (For MIG only.)
5. Check work cable for loose or
faulty connections.
6. Check gun for damage or
breaks.
7. Check for proper drive roll orien-
tation and alignment.
8. Check liner for proper size.
CAUTION
Pro-MIG 140
RECOMMENDED
COURSE OF ACTION
If all recommended possible areas
of misadjustment have been
checked and the problem persists,
Contact your local Lincoln
Authorized Field
Facility.
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Service