Lincoln Electric SVM136-A instruction

Return to Master TOC

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	F-4 - F-9
Test Procedures	F-10
Control Transformer (T2) Voltage Test	F-10
Input Contactor Test	F-13
Main Transformer (T1) Voltage Test	F-16
Static SCR/Diode Rectifier Bridge Test	F-21
Active SCR Test	F-24
Oscilloscope Waveforms	F-28
Normal Open Circuit Voltage Waveform	F-28
Typical Output Voltage Waveform - Machine Loaded	F-29
Typical SCR Gate Voltage Waveform	F-30
Abnormal Output Voltage Waveform - Machine Loaded	F-31
Replacement Procedures	F-32
Input Contactor (CR1) Cleaning/Replacement	F-32
Fan Motor and Blade Removal and Replacement	F-34
SCR/Diode Rectifier Assembly Removal and Replacement	F-36
Mounting of Stud Type Diodes to Aluminum Heat Sinks	F-44
Main Transformer Removal and Replacement	F-46
Retest After Repair	F-53