Lincoln Electric CLASSICII SVM125-A Service Manual page 51

Section F-1
TROUBLESHOOTING & REPAIR SECTION
Troubleshooting & Repair Section ................................................................................Section F
How to Use Troubleshooting Guide .......................................................................................F-2
PC Board Troubleshooting Procedures .................................................................................F-3
Troubleshooting Guide .................................................................................................F4 - F-12
Test Procedures ...................................................................................................................F-13
Alternator Rotor Test......................................................................................................F-13
Shunt Field Winding Test...............................................................................................F-17
Idler Solenoid Test .........................................................................................................F-20
Engine Throttle Adjustment Test....................................................................................F-22
Flashing the Fields ........................................................................................................F-26
Oscilloscope Waveforms......................................................................................................F-28
Normal Open Circuit Voltage Waveform (115VAC Supply) ...........................................F-28
Normal Open Circuit DC Weld Voltage Waveform ........................................................F-29
Typical DC Weld Output Voltage Waveform..................................................................F-30
Replacement Procedures ....................................................................................................F-31
Alternator Rotor Removal and Replacement ................................................................F-31
Alternator Stator Removal and Replacement................................................................F-38
Generator Frame Removal and Replacement ..............................................................F-43
Generator Armature Removal and Replacement ..........................................................F-46
Retest After Repair...............................................................................................................F-48
TABLE OF CONTENTS
CLASSIC II
Section F-1