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The wire feeds but starts and stops
intermittently.
TROUBLESHOOTING AND REPAIR
LN-7 GMA WIRE FEEDER
F-11
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
1. The gun trigger may be faulty.
Check or replace.
2. Check for mechanical
restrictions in the wire feed
path.
RECOMMENDED
COURSE OF ACTION
1. The drive motor brushes may
be faulty. Check and replace if
less than 1/4 in. in length.
2. The wire feed speed
potentiometer may be faulty.
Check the resistance of the
potentiometer over the entire
range of travel. The potentio-
meter should adjust from 0 to
10K Ohms. If adjustment is not
smooth and linear, replace per
Wire Feed Speed Potentio-
meter Replacement procedure.
3. The Control PC Board may be
faulty. Replace.
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact the Lincoln
Electric Service Department for technical troubleshooting assistance before you proceed. Call 216-383-2531 or 1-800-833-9353.
WIRE FEEDING AND WELDING PROBLEMS (Continued)
CAUTION
Observe Safety Guidelines
detailed in the beginning of this manual.
Troubleshooting Guide – See Wiring Diagrams for location of specified
components. See Wiring Diagrams for troubleshooting of specific circuits.