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F-33F-33
PRECISION TIG 275
TROUBLESHOOTING & REPAIR
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
electrical 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 trou-
bleshooting assistance before you proceed. Call 1-888-935-3877.
DESCRIPTION
The 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
3/8” Nut Driver
Analog Ohmmeter (Multimeter)
Tig 275 Wiring Diagrams
SCR Heatsink Assembly Drawing
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WARNING