Lincoln Electric SVM149-A service manual P2 P1

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F-23		TROUBLESHOOTING & REPAIR	F-23

MAIN INVERTER BOARD VOLTAGE TEST (CONTINUED)

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10.Carefully test for 12VDC at test points C7. See Figure F.9. See the Wiring Diagram. This is the rectified and regulated supply for the pulse width modulation circuit.

11.Carefully test for 12VDC at C18 test points. If it is not correct the control board or associated wiring may be faulty. See the Wiring Diagram. See Figure F.9.

12.Carefully check for the presence of 8VDC at C19 test points. If not correct the control board or associated wiring may be faulty. See Figure F.9.

See the Wiring Diagram.

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Figure F.9 Test Points

P2 P1

		AC
		+
	C18	+
	C18
	C17	+
		AC
	LEAD 2 (NZL)
	WRK	C19 C7
	LEAD 3 (EL)	C19 C7
	Plug J1
	Harness	+
	Harness	+
	Plug	+

RIGHT SIDE OF MACHINE

PRO-CUT 25

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Contents PRO-CUT Safety Cylinder may explode if damaged Précautions DE Sûreté SafetyMaster Table of Contents for ALL Sections PRO-CUT Installation Section Table of ContentsTechnical Specifications PRO-CUT 25 K1756-1 InstallationSelect Proper Location Safety Precautions Electric Shock can KillHigh Frequency Interference Protection Input Electrical ConnectionsGAS Input Connections Torch Output ConnectionsPRO-CUT Table of Contents Operation Section Preheat Temperature for Plasma Cutting Safety PrecautionsOperation DescriptionOperational Features and Controls Design Features AdvantagesUser Responsibility Consumable Life Cutting CapabilityLimitations Controls and SettingsPilot ARC Discussion Apparently wrong, reset the machine by turningGeneral In All Cases Procedure RecommendationsPRO-CUT Accessories General Options Accessories Maintenance Electric Shock can kill Routine MaintenancePRO CUT PRO-CUT Table of Contents Theory of Operation Section Theory of Operation General DescriptionInput Line VOLTAGE, and Auxiliary Transformer Figure E.3 Precharge and Protection Precharge and ProtectionReturn Return to Section TOC Main TransformerFigure E.5 Plasma Output Section and Torch Figure E.6 Control Board Control BoardSafety PARTS-IN-PLACE Protection Protection CircuitsAccidental Operation Protection Insulated Gate Bipolar Transistor Igbt Operation Table of Contents Troubleshooting & Repair Section HOW to USE Troubleshooting Guide Troubleshooting & RepairPC Board Troubleshooting Procedures Output Problems Function Problems See the Operation section Troubleshooting & Repair LED Function Problems Description Input Filter Capacitor Discharge ProcedureRight Side of Machine Discharge ProcedureMain Inverter Board Resistance Test Right Side of Machine IGBT’s D2 D1 D11 D10 PRO-CUT Input Board Voltage Test Test Points Fan PRO-CUT Main Inverter Board Voltage Test P2 P1 P2 P1 PRO-CUT Torch Continuity and Solenoid Test Torch Continuity and Solenoid Test Torch Continuity and Solenoid Test PRO-CUT AIR/GAS Solenoid Test AIR/GAS Solenoid Test Control Board Removal and Replacement Small Red Cap Screws Over tighten Input Board Removal and Replacement Input Board Input Board Removal & Replacement PRO-CUT Main Inverter Board Removal and Replacement Main Board Main Inverter Board Removal & Replacement PRO-CUT Switch Removal and Replacement PRO FAN Removal and Replacement Fan Do Not Over tighten Machine Input and Output Retest After RepairTable of Contents Electrical Diagrams Section Electrical DiagramsInput Voltage Board Pressure SCHEMATIC- Control Printed Circuit Board Sheet Electrical Diagrams Electrical Diagrams PC Board Assembly Main Inverter Board PC Board Assembly Input Board Cutting Current Path SVM Error Reporting Form