Lincoln Electric SVM 113-A guide

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Section F-1

TROUBLE SHOOTING & 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
Rotor Voltage Test	F-13
Rotor Resistance Test	F-15
Output Rectifier Bridge Test	F-18
Main Stator Test	F-20
Rotor “Flashing” Circuit Test	F-23
Engine Throttle Adjustment Test	F-26
Oscilloscope Waveforms
Normal Open Circuit Weld Voltage Waveform	F-31
Normal Open Circuit Voltage Waveform (115 VAC Supply)	F-32
Typical Weld Output Waveform - Machine Loaded	F-33
Abnormal Open Circuit Weld Voltage Waveform	F-34
Replacement Procedures
Brush Removal and Replacement	F-35
Rheostat Removal and Replacement	F-38
Field Capacitor Removal and Replacement	F-40
Field Diode Bridge Removal and Replacement	F-42
Idler Printed Circuit Board Removal and Replacement	F-45
Output Rectifier Bridge Removal and Replacement	F-47
Output Choke Removal and Replacement	F-50
Stator/Rotor Removal and Replacement (Kit S20925)	F-53
Retest After Repair	F-59

WELDANPOWER 125