Lincoln Electric SVM105-B - TROUBLESHOOTING & REPAIR SECTION -

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V300-PRO
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
Additional Troubleshooting Procedures........................................................................F-4
Troubleshooting Guide..................................................................................................F-5
Test Procedures
Input Filter Capacitor Discharge Procedure.........................................................F-11
Output Pilot Circuit Test.......................................................................................F-13
Protection Board Output Test...............................................................................F-17
Capacitor Balance Test........................................................................................F-21
Switch Board Test.................................................................................................F-25
Snubber Resistor Test..........................................................................................F-29
Output Diode Test.................................................................................................F-31
Input Rectifier Test................................................................................................F-33
OverCurrent Protection Current Trigger Test........................................................F-35
Overvoltage Protection DC Trigger Circuit Test...................................................F-38
Thermal Protection AC Trigger Circuit..................................................................F-43
Power Board Test.................................................................................................F-47
Replacement Procedures
Capacitor Replacement........................................................................................F-51
Switch Board Replacement..................................................................................F-55
Test After Switch Board or Capacitor Replacement.............................................F-57
Output Diode Replacement..................................................................................F-59
Retest After Any Repair ........................................................................................F-62