Lincoln Electric SP-250 service manual Troubleshooting & Repair

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TROUBLESHOOTING & REPAIR

TABLE OF CONTENTS

- TROUBLESHOOTING & REPAIR SECTION -

TROUBLESHOOTING & REPAIR SECTION	........... Section F
How to use Troubleshooting Guide	F-1
PC Board Troubleshooting Procedures	F-2
Troubleshooting Guide	F-3 - F10
Explanation of Prompting Error Messages	F11 -F-13
Test Procedures
SP-250 Main Transformer Test	F-14 - F-18
Static SCR Rectifier Test	F-19 - F-21
Active SCR Rectifier Test	F-22 - F-24
SP-250 Keypad Resistance Test	F-25 - F-27
Wire Drive Motor and Tach Feedback Test	.........F-28 - F-31
Oscilloscope Waveforms	F-32 - F-36
Replacement Procedures
Control Board Remove/Replace	F-37 - F-38
Keypad Remove/Replace	F-39 - F-40
Wire Drive Assembly Remove/Replace	F-41 - F-42
SCR Output Rectifier Remove/Replace	F-43 - F-44
Capacitor Bank Remove/Replace	F-45 - F-46
Main Transformer Remove/Replace	F-47 - F-48
Fan Motor Remove/Replace	F-49 - F-51
Retest After Repair	F-52

IDEALARC SP-250