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F-9
TROUBLESHOOTING & REPAIR
F-9
WIRE-MATIC 255
TROUBLESHOOTING GUIDE - Observe all Safety Guidelines detailed throughout this manual
WELDING PROBLEMS
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENTS(S)
RECOMMENDED
COURSE OF ACTION
The welding arc is variable and slug-
gish.
The arc striking is poor.
1. Perform the
Output Rectifier
Bridge Test.
2. The control board may be faulty.
Replace.
1. The control board may be faulty.
Replace.
1. Check the welding cable con-
nections for loose or faulty con-
nections.
2. Make sure the wire feed speed,
voltage, and shielding gas are
correct for the process being
used.
1. Check the welding cable con-
nections for loose or faulty con-
nections.
2. Make sure the wire feed speed,
voltage, and shielding gas are
correct for the process being
used.
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, con-
tact the Lincoln Electric Service Department for technical troubleshooting assistance before you proceed call 216-
383-2531 or 1-800-833-9353
CAUTION