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| TROUBLESHOOTING & REPAIR |
ACTIVE SCR TEST
WARNING
Service and repair should only be performed by Lincoln Electric factory trained person- nel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safe- ty 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
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CAUTION
If machine case sides and top are removed the case back and front must be support- ed. Failure to do this could result in mechanical or electrical damage to the TIG 255.
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TEST DESCRIPTION
The Active SCR Test will determine if the device is able to be gated “ON” and conduct current from anode to cathode.
MATERIALS NEEDED
An SCR tester as outlined in this procedure
TIG 255 Wiring Diagrams (see Electrical Diagrams section of this manual)
SCR Heat Sink Assembly Drawing, Figure F.14
