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F-12 F-12
SQUARE WAVE TIG 275
TROUBLESHOOTING & REPAIR
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
The high frequency “spark” is pre-
sent but weak.
1. The spark gap may be too
large. Check and reset per
instructions in the
Maintenance
Section
of this manual.
2. The work and/or torch cables
may be in poor condition allow-
ing the high frequency to “lead”
to ground. Use good quality
cables, preferably those with a
high natural rubber content and
as short as possible.
3. If helium shielding gas is being
used, reduce the percentage of
helium.
4. Make sure the tungsten elec-
trode is the correct size for the
process.
1. The high voltage transformer
(T2) may be faulty.
2. Capacitor C5 may be faulty.
3. The high frequency transformer
(T3) may be faulty.