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Section F-1 Section F-1
POWER MIG 350MP
Troubleshooting & Repair Section ................................................................................Section F
How to Use Troubleshooting Guide.......................................................................................F-2
PC Board Troubleshooting Procedures .................................................................................F-3
Troubleshooting Guide................................................................................................F-4 - F-15
Chopper Board Capacitor Discharge Procedure ..........................................................F-16
Main Transformer Test ..................................................................................................F-18
Chopper Board Test ......................................................................................................F-20
Control Rectifier Test.....................................................................................................F-23
Output Rectifier Assembly Test ....................................................................................F-25
Wire Drive Motor and Tachometer Feedback Test .......................................................F-27
Encoder PC Board Test (10562 & Above).....................................................................F-30
Current Transducer Test................................................................................................F-33
Power Mig Scrolling Dashes Test..................................................................................F-36
Oscilloscope Waveforms......................................................................................................F-38
Removal and Replacement Procedures..............................................................................F-40
Motor & Gear Box Removal and Replacement.............................................................F-40
Output Rectifier Removal and Replacement.................................................................F-44
Chopper Board Assembly Removal and Replacement.................................................F-47
Main Transformer and Output Choke Removal and Replacement ...............................F-50
Fan Motor Assembly Removal and Replacement.........................................................F-54
Voltage & Current Calibration Procedure......................................................................F-56
Retest after Repair...............................................................................................................F-59
TABLE OF CONTENTS
TROUBLESHOOTING & REPAIR SECTION