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TROUBLESHOOTING & REPAIR
F-26 F-26
SQUARE WAVE TIG 275
WARNING
STATIC SCR TEST
Service and repair should be performed by only Lincoln Electric factory trained personnel.
Unauthorized repairs performed on this equipment may result in danger to the technician or
machine operator and will invalidate your factory warranty. For your safety and to avoid elec-
trical shock, please observe all safety notes and precautions detailed throughout this manual.
If for any reason you do not understand the test procedures or are unable to perform the
test/repairs safely, contact the Lincoln Electric Service Department for electrical troubleshoot-
ing assistance before you proceed. Call 216-383-2531 or 1-800-833-9353 (WELD).
TEST DESCRIPTION
The Static SCR Test is a quick check to determine if an SCR is shorted or “leaky.” See
machine waveform section for normal and abnormal SCR waveforms.
MATERIALS NEEDED
Analog Ohmmeter (Multimeter)
TIG 275 Wiring Diagrams
SCR Heat Sink Assembly Drawing
3/8” Nut driver
This procedure takes approximately 12 minutes to perform.