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Section F-1 Section F-1
SQUARE WAVE TIG 275
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
Test Procedures
High Frequency Circuit Disable Procedure ........................................................................F-18
T1 Main Transformer Test...................................................................................................F-20
Gas (Water) Solenoid Test..................................................................................................F-24
Static SCR Test...................................................................................................................F-26
Active SCR Test..................................................................................................................F-29
Oscilloscope Waveforms
Normal Open Circuit Voltage Waveform—AC TIG Mode...................................................F-33
Normal Open Circuit Voltage Waveform—DC TIG Mode...................................................F-34
Normal Open Circuit Voltage Waveform—AC Stick Mode .................................................F-35
Normal Open Circuit Voltage Waveform—DC Stick Mode.................................................F-36
Typical Output Voltage Waveform—Machine Loaded—AC TIG Mode ..............................F-37
Typical Output Voltage Waveform—Machine Loaded—DC TIG Mode ..............................F-38
Typical Output Voltage Waveform—Machine Loaded—AC Stick Mode.............................F-39
Typical Output Voltage Waveform—Machine Loaded—DC Stick Mode ............................F-40
Abnormal Open Circuit Voltage—DC TIG Mode—One Output SCR Not Functioning.......F-41
Replacement Procedures
High Voltage Transformer Removal and Replacement ......................................................F-42
SCR Bridge Assembly Removal and Replacement............................................................F-45
Polarity Switch Removal and Replacement........................................................................F-49
Main Transformer and Output Choke Assembly Removal and Replacement ....................F-54
Retest After Repair....................................................................................................................F-59