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TROUBLESHOOTING & REPAIR
OUTPUT SHUNT/WELDING FEEDBACK 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 following procedure will determine whether the shunt amplifier board is receiving the correct supply voltage from the control board and providing the correct feedback voltage.
MATERIALS NEEDED
Volt/Ohmmeter (Multimeter) 5/16" Nut driver
3/8" Nut driver
Machine Wiring Diagram in the Electrical Diagrams section of this manual Load Bank
This procedure takes approximately 40 minutes to perform.
