Lincoln Electric PRO-CUT 55 SVM140-A - Manual (Page 38)

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Section F-1 Section F-1
PRO-CUT 55
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
TABLE OF CONTENTS
TROUBLESHOOTING & REPAIR SECTION