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TROUBLESHOOTING & REPAIR
F-7 F-7
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
OUTPUT PROBLEMS
The machine does not have weld-
ing output in the Stick mode. The
machine operates correctly in the
TIG mode.
1. Check the electrode cable and
holder for loose or faulty con-
nections.
2. Make sure the Stick/TIG switch
(S3) is in the proper position
and operating correctly.
1. Check the Stick/TIG switch (S3)
and associated leads. See the
Wiring Diagram.
2. The control board may be faulty.
The machine welds at a very low
output regardless of the current
control setting.
1. If welding in the TIG mode, the
remote control device may be
defective.
2. Make certain the input line volt-
age is correct for the machine’s
reconnect configuration.
3. Check the welding cables
and/or torch for loose or faulty
connections.
1. Check the polarity switch and
associated leads.
2. Check the interior connections
of the heavy current carrying
leads.
3. Perform the
SCR Bridge Test.
4. Perform the
T1 Transformer
Test.
5. Check the current control for
proper operation. Normal resis-
tance is 10,000 ohms. See the
Wiring Diagram.
6. The control board may be faulty.