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TROUBLESHOOTING & REPAIR
FIELD EFFECT TRANSISTOR/SWITCH BOARD TEST
OR
IGBT/SWITCH BOARD 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
DESCRIPTION
The following procedure will determine if the four switch boards and their related circuitry are functioning properly. This is a resistance test, not a voltage test. The machine does not have to be powered up to perform the test, which is both safer for the technician and less likely to result in accidental damage to the switch boards.
MATERIALS NEEDED
Analog Volt/Ohmmeter (Multimeter) 5/16" Nut driver
3/8" Nut driver
Machine Wiring Diagram in the Electrical Diagrams section of this manual
