Lincoln Electric LN-9 SVM127-A Service Manual page 74

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TROUBLESHOOTING GUIDE
PROBLEMS
(SYMPTOMS)
The welding arc is variable or
"hunting."
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. Make sure the welding parame-
ters are correct for the welding
procedure being used.
2. Check the welding cables for
loose or faulty connections.
3. The gun cable may be faulty.
Check or replace.
4. Check cable liner for proper
size.
5. The gun contact tip may be
worn. Check or replace.
6. The welding power supply may
be faulty. Check or replace.
CAUTION
LN-9 Wire Feeder
Observe Safety Guidelines
detailed in the beginning of this manual.
RECOMMENDED
COURSE OF ACTION
1. Put the power
"Machine Control" for voltage,
and check if welding perfor-
mance improves. If the problem
is resolved, check or replace the
control cable. Or, the LN-9 volt-
age PC board may be faulty.
2. Perform the Wire Drive Motor
Test.
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source in