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TROUBLESHOOTING & REPAIR |
STATIC SCR RECTIFIER ASSEMBLY TEST
WARNING
Service and repair should only be performed by Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in dan- ger to the technician or machine operator and will invalidate your factory war- ranty. 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 per- form the test/repairs safely, contact the Lincoln Electric service department for technical troubleshooting assistance before you proceed. Call
TEST DESCRIPTION
This test is used to quickly determine if an SCR or diode is shorted or “leaky.” See the Machine Waveform Section in this manual for normal and abnormal output waveforms.
MATERIALS NEEDED
Analog
POWER MIG 255 wiring diagrams (See Electrical Diagrams Section of this Manual) 3/8 in. Nutdriver
5/16 in. Nutdriver
1/2 in. Open end or socket wrench
