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TROUBLESHOOTING & REPAIR
PROTECTION PC 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
TEST DESCRIPTION
This test will determine if the protection PC board circuitry is intact and capable of passing signal currents.
MATERIALS NEEDED
Volt/Ohmmeter (Multimeter) 5/16" Nut driver
Phillips head screw driver
Square Wave TIG Wiring Diagram (located in the Electrical Diagrams section of this manual)
Protection PC Board Schematic
Protection PC Board Resistance Test Points Chart
SQUARE WAVE TIG 355
