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TROUBLESHOOTING & REPAIR
FINE CONTROL POTENTIOMETER 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 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 test/repairs safely, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call
DESCRIPTION
This test will determine whether the fine control potentiometer and PC board are defective. Failure or intermediate failure of the control potentiometer circuit can result in erratic weld output or loss of weld output.
MATERIALS NEEDED
5/16” Nut Driver
Commander 400 Wiring Diagram (See the electrical diagrams section of this manual)
Control PC Board Layout (See the electrical diagrams section of this manual)
This procedure takes approximately 25 minutes to perform.
