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TROUBLESHOOTING & REPAIR
F-17 F-17
LN-9 Wire Feeder
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TROUBLESHOOTING GUIDE Observe Safety Guidelines
detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
WELDING PROBLEMS
Poor arc striking with sticking or
"blast offs." The weld bead may
also be ropey and display weld
porosity.
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.
1. Jumper the "BYPASS" terminals
on the voltage PC board.
2. Put the power source in
"Machine Control" and check if
welding performance improves.
If the problem is resolved, check
or replace the control cable. Or,
the LN-9 voltage PC board may
be faulty.
CAUTION
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.