Lincoln Electric SVM169-A ユーザーズマニュアル

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PRECISION TIG 185

Section F-1

Section F-1

TABLE OF CONTENTS

- TROUBLESHOOTING & REPAIR SECTION -

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

High Frequency Circuit Disable Procedure ..........................................................F-15

T1 Transformer Test ..............................................................................................F-17

Static SCR Test ....................................................................................................F-21

Active SCR Test ....................................................................................................F-25

Oscilloscope Waveforms

Normal Open Circuit Voltage Waveform-AC TIG Mode .......................................F-29

Normal Open Circuit Voltage Waveform-DC TIG Mode.......................................F-30

Normal Open Circuit Voltage Waveform-AC Stick Mode.....................................F-31

Normal Open Circuit Voltage Waveform-DC Stick Mode ....................................F-32

Typical Output Voltage Waveform-Machine Loaded AC TIG Mode.....................F-33

Typical Output Voltage Waveform-Machine Loaded DC TIG Mode ....................F-34

Typical Output Voltage Waveform-Machine Loaded AC Stick Mode ..................F-35

Typical Output Voltage Waveform-Machine Loaded DC Stick Mode ..................F-36

Abnormal Open Circuit Voltage-DC TIG Mode One SCR not Functioning..........F-37

Replacement Procedures

SCR Bridge Assembly Removal and Replacement .............................................F-39

Polarity Switch Removal and Replacement .........................................................F-45

High Voltage Transformer Removal and Replacement ........................................F-49

Main Transformer and Output Choke Removal and Replacement ......................F-53

Retest after Repair ......................................................................................................F-57