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TROUBLESHOOTING & REPAIR
F-11 F-11
SQUARE WAVE TIG 275
TROUBLESHOOTING GUIDE Observe Safety Guidelines
detailed in the beginning of this manual.
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.
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
TIG WELDING PROBLEMS
No high frequency. The machine is
in the TIG mode and has normal
output.
1. If the machine is in a highly dirty
environment with conductive
contaminants, check and clean
the spark gap with a low pres-
sure air stream per the mainte-
nance instructions.
2. Check the spark gap operation
and setting. Normal is (0.015”).
Refer to the
Maintenance
Section
of this manual.
1. Check the high voltage trans-
former (T2). The normal resis-
tance of the secondary winding
is 12.5k ohms.
ELECTRIC SHOCK
CAN KILL. When
115 VAC is applied to
the primary of T2, a
very high voltage is
developed on the secondary wind-
ing. For assistance, call the
Lincoln Electric Service Depart-
ment. (216-383-2531 or 1-800-
833-9353 (WELD).
2. Check R5, C6, C5, L3 and L4.
Replace if defective.
3. The control board may be faulty.
WARNING