Lincoln Electric SVM136-A User Manual

Troubleshooting & Repair Section.................................................................................Section F

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

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

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