Perform the scr rectifier, Bridge test, Troubleshooting & repair – Lincoln Electric MULTI-SOURCE SVM155-A User Manual
Page 49: Test description, Materials needed, Static scr test, Warning
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STATIC SCR TEST
TROUBLESHOOTING & REPAIR
MULTI-SOURCE
WARNING
Service and repair should be performed only by Lincoln Electric factory trained personnel.
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 precautions 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 (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 output waveforms.
MATERIALS NEEDED
Analog Volt/Ohm Meter (Multimeter)
MULTI-SOURCE wiring diagrams (See Electrical Diagram Section of Manual).
3/8” Nut Driver
9/16” Wrench
This procedure takes approximately 45 minutes to perform.