Lincoln Electric POWER MIG SVM160-B - Manual (Page 45)

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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