Lincoln Electric POWER WAVE 355/405 SVM159-A Service Manual page 43

Section F-1
TROUBLESHOOTING & REPAIR SECTION
Troubleshooting & Repair Section .................................................................................Section F
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 Diode 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
TABLE OF CONTENTS
POWER WAVE 355/405
Section F-1