Lincoln Electric SVM138-A Service Manual page 80

F-16
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. The gun contact tip may be
worn. Check or replace.
6. The welding power supply may
be faulty. Check or replace.
CAUTION
LN-9 GMA 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 whether welding per-
formance improves. If the prob-
lem is resolved, check or
replace the control cable. Or,
the LN-9 GMA voltage PC board
may be faulty.
2. Perform the Wire Drive Motor
Test.
F-16
source in