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PRECISION TIG 185
TROUBLESHOOTING & REPAIR
F-21 F-21
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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 pre-
cautions detailed throughout this manual.
If for any reason you do not understand the test procedures or are unable to per-
form the test / repairs safely, contact the Lincoln Electric Service Department for
electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.
WARNING
STATIC SCR TEST
TEST DESCRIPTION
This procedure 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
Volt/Ohm Meter (Analog)
Precision TIG 185 Wiring Diagrams
3/8” nutdriver
SCR Heat Sink Assembly Drawing