LN-742 & LN-742H
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PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENTS(S)
RECOMMENDED
COURSE OF ACTION
F-8
TROUBLESHOOTING AND REPAIR
F-8
Observe all Safety Guidelines detailed throughout this manual
FEEDING PROBLEMS
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.
CAUTION
1.
Contact the Lincoln Electric
Service Department, 1-216-383-
2531 or 1-800-833-9353 (WELD).
1. Perform the
Drive Motor Test.
2. The control board may be faulty.
Replace.
The wire is feeding rough or not
feeding. The drive rolls are turning.
The drive rolls do not turn when the
gun trigger is pressed. The gas
solenoid activates and arc voltage is
present.
1. Check for mechanical restric-
tions in the wire feeding path.
Check the gun and gun compo-
nents.
2. Check the drive roll position and
idle roll pressure.
3. The electrode may be dirty or
rusty.
4. Check for the correct gun liner,
tip, and guide tubes.
1. Check plug J5 on the control
board for loose or faulty connec-
tions.