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Section F-1 Section F-1
POWER MIG 300
Troubleshooting & Repair Section ................................................................................Section F
How to Use Troubleshooting Guide.......................................................................................F-2
PC Board Troubleshooting Procedures .................................................................................F-3
Troubleshooting Guide ................................................................................................F-4 - F-11
Chopper Board Capacitor Discharge Procedure ..........................................................F-12
Main Transformer Test ..................................................................................................F-14
Chopper Board Test ......................................................................................................F-16
Control Rectifier Test.....................................................................................................F-19
Output Rectifier Assembly Test ....................................................................................F-21
Wire Drive Motor and Tachometer Feedback Test .......................................................F-23
Encoder PC Board Test (10562 & Above).....................................................................F-26
Current Transducer Test................................................................................................F-29
Power Mig Scrolling Dashes Test..................................................................................F-32
Oscilloscope Waveforms......................................................................................................F-34
Removal and Replacement Procedures..............................................................................F-36
Motor & Gear Box Removal and Replacement.............................................................F-36
Output Rectifier Removal and Replacement.................................................................F-40
Chopper Board Assembly Removal and Replacement.................................................F-43
Main Transformer and Output Choke Removal and Replacement ...............................F-46
Fan Motor Assembly Removal and Replacement.........................................................F-50
Voltage & Current Calibration Procedure......................................................................F-52
Retest after Repair...............................................................................................................F-57
TABLE OF CONTENTS
TROUBLESHOOTING & REPAIR SECTION