Static Scr Test - Lincoln Electric SQUARE WAVE TIG 175 Service Manual

F-21
Service and repair should be performed only by Lincoln Electric factory trained per-
sonnel. Unauthorized repairs performed on this equipment could result in danger to
the technician or the machine operator and will invalidate your factory warranty. For
your safety and to avoid electrical shock, please observe all safety notes and precau-
tions detailed throughout this manual.
If for any reason you do not understand the test procedures or are unable to perform
the tests/repairs safely, contact the Lincoln Electric service department for technical
troubleshooting assistance before you proceed.
Call (216) 383-2531 or 1-888-935-3877.
_____________________________________________________________
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 175 Wiring Diagrams
SCR Heat Sink Assembly Drawing.
3/8" nutdriver
TROUBLESHOOTING & REPAIR

STATIC SCR TEST

WARNING
SQUARE WAVE TIG 175
F-21