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TROUBLESHOOTING & REPAIR
PWM OUTPUT 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 troubleshoot- ing assistance before you proceed. Call
DESCRIPTION
This test will determine if the weld terminal switch and PWM output circuit on the control board are responding properly to input changes from the feedback and control input circuits. This test assumes that the CONTROL INPUT TEST and FEEDBACK INPUT TEST have already been performed.
MATERIALS NEEDED
3/8” Wrench
5/16" Nut Driver
Oscilloscope
This procedure should take approximately 60 minutes to perform.
