Section F-1
-TROUBLESHOOTING & REPAIR SECTION-
Troubleshooting & Repair Section.......................................................................................Section F
Troubleshooting Guide ................................................................................................................F-4
Test Procedures ........................................................................................................................F-20
Power Board Test ...............................................................................................................F-25
Input Contactor Test ...........................................................................................................F-28
Pilot Transformer Test .........................................................................................................F-32
Feed-Thru PC Board Test...................................................................................................F-34
Protection PC Board Test ...................................................................................................F-38
Main Transformer Test ........................................................................................................F-41
Control Board Test..............................................................................................................F-47
Static SCR Test...................................................................................................................F-51
Active SCR Test ..................................................................................................................F-54
Oscilloscope Waveforms ..........................................................................................................F-58
Replacement Procedures..........................................................................................................F-66
Rest after Repair .......................................................................................................................F-84
TABLE OF CONTENTS
SQUARE WAVE TIG 355
Section F-1