Lincoln Electric IDEALARC SVM136-A - Manual (Page 41)

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Section F-1 Section F-1
IDEALARC CV-400
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
TABLE OF CONTENTS
TROUBLESHOOTING & REPAIR SECTION