Section f troubleshooting & repair – Lincoln Electric WELDANPOWER SVM 113-A User Manual

Page 39

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Section F-1

Section F-1

WELDANPOWER 125

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

TABLE OF CONTENTS

TROUBLE SHOOTING & REPAIR SECTION

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