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F-1F-1
PRECISION TIG 275
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Troubleshooting & Repair Section ................................................................................Section F
How to Use Troubleshooting Guide.......................................................................................F-2
PC Board Troubleshooting Procedures and Replacement....................................................F-3
Troubleshooting Guide...........................................................................................................F-4
Test Procedures
Meter Calibration Adjustments ......................................................................................F-19
High Frequency Circuit Disable Procedure...................................................................F-23
Protection Board Test ....................................................................................................F-25
T1 Main Transformer Test .............................................................................................F-27
Gas (Water) Solenoid Test ............................................................................................F-31
Static SCR Test .............................................................................................................F-33
Active SCR Test.............................................................................................................F-35
Typical Output Voltage Waveform (DC Tig Mode) ........................................................F-39
Typical Output Voltage Waveform (AC Tig Mode).........................................................F-40
Typical AC Voltage Waveform - 50 AMPS (AC Tig Mode) ............................................F-41
Typical AC Voltage Waveform - 2 AMPS (AC Tig Mode) ..............................................F-42
Typical Output Voltage Waveform - 200 AMPS ( DC Tig Mode)..................................F-43
Replacement Procedures
High Voltage Transformer Removal & Replacement.....................................................F-45
Control Board Removal and Replacement....................................................................F-49
SCR Bridge Assembly Removal and Replacement ......................................................F-53
Polarity Switch Removal and Replacement ..................................................................F-57
SCR Removal and Replacement ..................................................................................F-59
Retest after Repair ........................................................................................................F-61
TABLE OF CONTENTS
TROUBLESHOOTING & REPAIR SECTION