Lincoln Electric SVM151-A service manual Table of Contents Troubleshooting & Repair Section

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Section F-1	Section F-1
TABLE OF CONTENTS
- TROUBLESHOOTING & REPAIR SECTION -
Troubleshooting & Repair Section	Section F
How to Use Troubleshooting Guide	F-2
PC Board Troubleshooting Procedures	F-3
Troubleshooting Guide	F-4 - F-12
Test Procedures	F-13
Case Cover Assembly Removal and Replacement Procedure	F-13
Power Module Capacitor Discharge Procedure	F-15
Input Contactor Coil Resistance and Supply Voltage Test	F-17
Analog Control Power Supply PC Board Test	F-20
DC Buss Power Supply PC Board Test	F-23
Chopper PC Board Input Voltages and Resistance Tests	F-26
Oscilloscope Waveforms	F-29
Normal Open Circuit Voltage Waveform (CC Mode) –
Input Voltage Applied 75 VDC	F-29
Normal Open Circuit Voltage Waveform (CV Mode) –
Output Control at Maximum	F-30
Normal Weld Voltage Waveform (CC Stick Mode) –
Machine Loaded to 350 Amps at 34 Volts	F-31
Normal Weld Voltage Waveform (CV Mode) –
Machine Loaded to 350 Amps at 34 Volts	F-32
Normal Open Circuit Voltage Waveform (CV Mode) –
Output Control at Maximum	F-33
Replacement Procedures	F-34
Case Front Assembly Removal and Replacement	F-34
Weld Control Board Removal and Replacement	F-36
Amps/Volts Digital Meter and Potentiometer Removal and Replacement	F-39
Input Contactor Removal and Replacement	F-42
Input Diode Removal and Replacement	F-45
Fan Motor Assembly Removal and Replacement	F-48
Power Capacitor Removal and Replacement	F-51
Chopper PC Board and Diode Module Removal and Replacement	F-54
Diode Module Removal and Replacement	F-57
Retest After Repair	F-60

MULTI-WELD 350