Lincoln Electric POWER-ARC SVM103-C Service Manual page 49

Section F
- TROUBLESHOOTING & REPAIR SECTION -
Troubleshooting & Repair Section .................................................................................Section F
How to Use Troubleshooting Guide ......................................................................................F-2
Troubleshooting Guide.................................................................................................F2 - F-10
Test Procedures
Rotor Voltage Test.........................................................................................................F-11
Rotor Resistance Test ...................................................................................................F-13
Engine Throttle Adjustment Test ...................................................................................F-16
Oscilloscope Waveforms
Normal Open Circuit Weld Voltage Waveform ..............................................................F-19
Normal Open Circuit Weld Voltage Waveform (115 VAC Supply).................................F-20
Typical Weld Output Waveform - Machine Loaded ......................................................F-21
Replacement Procedures
Brush Removal and Replacement.................................................................................F-22
Rheostat Removal and Replacement...........................................................................F-25
Capacitor and Diode Bridge Removal and Replacement .............................................F-27
Stator/Rotor Removal and Replacement (Kit S20925)..................................................F-30
Retest After Repair...............................................................................................................F-35
TABLE OF CONTENTS
POWER-ARC 4000
Section F