Lincoln Electric INVERTEC V300-PRO SVM105-B Service Manual page 31

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
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
TABLE OF CONTENTS
V300-PRO
Section F-1