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TROUBLESHOOTING & REPAIR
STATIC SCR TEST
WARNING
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 trou- bleshooting assistance before you proceed. Call
TEST DESCRIPTION
The Static SCR Test is a quick check to determine if an SCR is shorted or “leaky.” See the machine waveform section for normal and abnormal SCR waveforms.
MATERIALS NEEDED
Analog ohmmeter (Multimeter) 5/16” Nut driver
Machine Wiring Diagrams (See the Electrical Diagrams section of this manual.) SCR Test Points drawing, Figure F.18.
SQUARE WAVE TIG 355
