Lincoln Electric SVM140-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	Section F
How to Use Troubleshooting Guide	F-2
PC Board Troubleshooting Procedures and Replacement	F-3
Troubleshooting Guide	F-4
Test Procedures
Troubleshooting Flow Chart	F-10
Input Filter Capacitor Discharge Procedure	F-12
Input Rectifier Test	F-14
Primary Power Board Resistance Test and Capacitor Voltage Test	F-18
Output Power Board Resistance Test	F-24
Torch Continuity and Solenoid Test	F-28
Air/Gas Solenoid Test	F-32
T2 Auxiliary Transformer Test	F-34
Trigger Circuit Test	F-38
Low Voltage Circuit Test	F-44
Replacement Procedures
Control Board Removal and Replacement	F-50
Display Board Removal and Replacement	F-54
Output Power Board Removal and Replacement	F-58
Primary Power Board and Filter Capacitor Removal and Replacement	F-62
Input Rectifier Bridge Removal and Replacement	F-66
Retest after Repair	F-69

PRO-CUT 55