Lincoln Electric SVM123-A service manual Troubleshooting & Repair

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F-1	TROUBLESHOOTING & REPAIR	F-1
	TABLE OF CONTENTS
	-TROUBLESHOOTING AND REPAIR SECTION-
	TROUBLESHOOTING AND REPAIR SECTION	Section F
	How to Use Troubleshooting Guide	F-2
	Safety Precautions	F-3
	PC Board Troubleshooting Procedures	F-3
	Troubleshooting Guide	F-4
	Output Problems	F-4
	Function Problems	F-9
	Welding Problems	F-11
	Test Procedures
	Control Transformer (T2) Voltage Test	F-13
	Main Transformer (T1) Voltage Test	F-16
	Firing Board Test	F-20
	Control Board Test	F-25
	Static SCR Test	F-30
	Active SCR Test	F-34
	Oscilloscope Waveforms
	Normal Open Circuit Voltage Waveform Constant Current Mode	F-38
	No Load
	Normal Open Circuit Voltage Waveform Constant Voltage	F-39
	Innershield - Maximum Output Setting - No Load
	Normal Open Circuit Voltage Waveform Constant Voltage	F-40
	Innershield - Minimum Output Setting - No Load
	Typical Output Voltage Waveform - Machine Loaded Constant Voltage	F-41
	Innershield Mode
	Typical Output Voltage Waveform - Machine Loaded	F-42
	500 Amp Output Terminal Constant Voltage Innershield Mode
	Typical SCR Gate Voltage Waveform Constant Voltage	F-43
	Innershield Maximum Output Setting - No Load
	Abnormal Open Circuit Voltage Waveform Constant Voltage	F-44
	Innershield One Output SCR Not Functioning Maximum Output Setting
	Replacement Procedures
	Input Contactor Cleaning and or Replacement	F-45
	SCR Output Bridge Replacement	F-49
	SCR Output Bridge Removal	F-50
	Removal of Individual SCR Heat Sink Assemblies	F-52
	SCR Heat Sink Installation	F-53
	SCR Output Bridge Installation	F-53
	Removal and Reassembly of Lift Bail	F-55
	Removal of Lift Bail	F-56
	Reassembly of Lift Bail	F-57
	Main Transformer Removal and Installation	F-58
	Main Transformer Disassembly and Assembly	F-59
	Main Transformer Disassembly	F-60
	Coil Removal and Replacement	F-60
	Transformer Reassembly	F-61
	Retest After Repair	F-63

IDEALARC DC-1000