Lincoln Electric SVM138-A Service Manual page 81

F-17
TROUBLESHOOTING GUIDE
PROBLEMS
(SYMPTOMS)
Poor arc striking with sticking or
"blast offs." The weld bead may
also be ropey and display weld
porosity.
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 and techniques 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.
5. The welding power source 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" and check
whether welding performance
improves. If the problem is
resolved, check or replace the
control cable.
GMA voltage PC board may be
faulty.
F-17
source in
Or, the LN-9