Lincoln Electric SVM118-A manual

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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	F-20
	Input Power Factor Capacitor Voltage Check and Discharge Procedure	F-20
	ARC Start Trigger Circuit Test	F-22
	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 Transformer (T5) Voltage Test	F-44
	Control Board Test	F-47
	Static SCR Test	F-51
	Active SCR Test	F-54
	Oscilloscope Waveforms	F-58
	Normal Open Circuit Voltage Waveform (DC Stick Mode)	F-58
	Normal Open Circuit Voltage Waveform (AC Stick Mode)	F-59
	Normal Open Circuit Voltage Waveform (DC TIG Mode)	F-60
	Normal Open Circuit Voltage Waveform (AC TIG Mode)	F-61
	Typical Output Voltage Waveform – Machine Loaded (DC TIG Mode)	F-62
	AC TIG Mode (Balanced Waveform)	F-63
	Abnormal Open Circuit Voltage – (DC TIG Mode, One
	Output SCR Not Functioning)	F-64
	Abnormal Open Circuit Voltage – (AC TIG Mode, One
	Output SCR Not Functioning)	F-65
	Replacement Procedures	F-66
	Control PC Board Removal and Replacement	F-66
	Power PC Board Removal and Replacement	F-68
	Input Contactor (C1) Removal and Replacement	F-70
	Fan Motor and Blade Removal and Replacement	F-73
	Output Rectifier Removal and Replacement	F-75
	SCR Removal and Replacement	F-78
	Rest after Repair	F-84

SQUARE WAVE TIG 355

Lincoln Electric SVM118-A service manual Table of Contents Troubleshooting & Repair Section