Lincoln Electric 355M, 405M service manual 1TABLE of Contents Troubleshooting and Repair F-1

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F-1TABLE OF CONTENTS - TROUBLESHOOTING AND REPAIR F-1

Troubleshooting and Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .F-1

How to Use Troubleshooting Guide	F-2
PC Board Troubleshooting Procedures and Replacement	F-3
Troubleshooting Guide	F-4
Test Procedures
Input Filter Capacitor Discharge Procedure	F-13
Main Switch Board Test	F-15
Input Rectifier Test	F-19
Power Board Test	F-23
DC Bus Board Test	F-27
Output Rectifier Modules Test	F-31
Auxiliary Transformer Test	F-35
Current Transducer Test	F-39
Fan Control and Motor Test	F-43
Replacement Procedures
Control Board Removal and Replacement	F-47
Main Switch Board Removal and Replacement	F-51
Snubber Board Removal and Replacement	F-55
Power Board Removal and Replacement	F-57
DC Bus Board Removal and Replacement	F-61
Input Rectifier Removal and Replacement	F-65
Output Rectifier Modules Removal and Replacement	F-69
Current Transducer Removal and Replacement	F-73
Retest after Repair	F-78

POWER WAVE 355M/405M