Lincoln Electric SVM107-B service manual Table of Contents Trouble Shooting & Repair Section

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Section F-1 Section F-1

TABLE OF CONTENTS

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-13
Test Procedures
Rotor Voltage Test	F-15
Rotor Resistance Test	F-17
Auxiliary and Field Winding Test	F-21
Output Rectifier Bridge Test	F-25
Charging Circuit Test	F-27
Engine Throttle Adjustment Test	F-29
Oscilloscope Waveforms	F-33
Normal Open Circuit Voltage Waveform (115 VAC Supply)	F-33
Typical DC Weld Output Waveform (CV Mode) – Machine Loaded	F-34
Typical DC Weld Output Waveform (CC Mode) – Machine Loaded	F-35
Typical AC Weld Output Waveform – Machine Loaded	F-36
Abnormal Open Circuit Weld Voltage Waveform (CV Mode, one diode open)	F-37
Abnormal Open Circuit DC Weld Voltage Waveform	F-38
Normal Open Circuit Weld Voltage Waveform (CV Mode)	F-39
Normal Open Circuit DC Weld Voltage Waveform	F-40
Normal Open Circuit AC Weld Voltage Waveform	F-41
Replacement Procedures	F-43
Brush Removal and Replacement	F-43
Field Capacitor and Rectifier Bridge Removal and Replacement	F-47
Printed Circuit Board Removal and Replacement	F-51
Output Rectifier Bridge Removal and Replacement	F-55
Engine Rotor Removal and Replacement (Kit S20788)	F-59
Retest After Repair	F-64

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