Lincoln Electric SVM156-A service manual Table of Contents Troubleshooting & Repair Section

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Section F-1	Section F-1
TABLE OF CONTENTS
- TROUBLESHOOTING & REPAIR SECTION -
Troubleshooting & Repair	Section F
How to Use Troubleshooting Guide	F-2
PC Board Troubleshooting Procedures	F-3
Troubleshooting Guide	F-4
Test Procedures	F-9
Input Filter Capacitor Discharge Procedure	F-9
Switch Board Test	F-11
Input Rectifier Test	F-14
Input Contactor Test	F-17
DC Bus Power Supply PC Board Test	F-20
Power Board Test	F-23
Input Board Test	F-26
STT Chopper Board Test	F-30
Power Wave Current Transducer Test	F-33
STT Current Transducer Test	F-37
Output Rectifier Test	F-41
Auxiliary Transformer No. 1 Test	F-43
Auxiliary Transformer No. 2 Test	F-46
Component Removal and Replacement Procedure	F-48
Input Rectifier Removal and Replacement	F-48
Input Contactor Removal and Replacement	F-50
Auxiliary Transformer No. 1 Removal and Replacement Procedure	F-52
Auxiliary Transformer No. 2 Removal and Replacement Procedure	F-55
Control, Feed Head, or Voltage Sense PC Board Removal and Replacement	F-58
Gateway PC Board Removal and Replacement	F-62
STT Current Transducer Removal and Replacement	F-64
Power Wave Current Transducer Removal and Replacement	F-67
Output Rectifier, STT Chopper Board and Rectifier Module Removal
and Replacement	F-70
Switch Board and Filter Capacitor Removal and Replacement	F-74
Retest after Repair	F-77

POWER WAVE 455/R