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TROUBLESHOOTING & REPAIR
F-18 F-18
LN-9 GMA 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
METER FUNCTION PROBLEMS
The arc is unstable or oscillating. 1. Check the welding cables for
loose or faulty connections.
2. Make sure the electrode and
gas (if used) are correct for the
process being used.
3. Put the Lincoln power source in
the “Machine Control” mode.
Jumper the “BYPASS” pins on
the LN-9 GMA voltage PC
board. Adjust the weld voltage
from the power source for the
process being used. If the prob-
lem is NOT resolved, the power
source may be faulty.
1. The LN-9 GMA voltage PC
board may be faulty. Replace.
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.