Lincoln Electric SVM104-A service manual Figure F.14-Power Board Removal/Replacement

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Section TOC

Master TOC

F-39	TROUBLESHOOTING & REPAIR

POWER BOARD REMOVAL

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Return to Section TOC

to Section TOC

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to Master TOC

H1

LEAD

H2

LEAD

C

LEADS

NEG

LEAD

#40

LEADS

MOUNTING1J21 SCREWS

			J21
H1		40 G1
		B	G2
			G2
H2	4J20
	4J20
	2J20	J20	1J20
	2J20		1J20

C

NEG

#40

3J22 J22 1J22

4J222J22

POWER BOARD

L7941

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Return

FIGURE F.14-Power Board Removal/Replacement

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REMOVAL/REPLACEMENT

PROCEDURE

1.Disconnect input power to the machine.

2.Remove the Left Case Side Assembly.

3.Perform the CAPACITOR

DISCHARGE PROCEDURE.

4.Remove the Molex Plugs J20, J21, and J22 from the Power Board.

PRO-CUT 60

5.Remove G1, G2, 40, & B lead spade lugs from the terminals on the SCR modules. See Figure F.14.

6.Remove the two C leads, the NEG lead, and the two # 40 leads by unscrewing the

terminal screws with a Phillips

head screw driver. See Figure F.14.

7.Remove leads H1 and H2 by unscrewing the terminal screws with a Phillips head screw driver. See Figure F.14.

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Contents SVM104-A Safety Electric Shock can killWelding or Cutting Sparks can cause fire or explosion Iii Electric and Magnetic FieldsPrécautions DE Sûreté Sûreté Pour Soudage a L’ArcMaster Table of Contents for ALL Sections Table of Contents Installation Technical Specifications PRO-CUTSafety Precautions Electric Shock can Kill Select Proper LocationHigh Frequency Interference Protection Tilting➁ ➂ ➀ ➃ Input Electrical ConnectionsGround Connection Fuse and Wire SizesInput Power Supply Connections AIR Input Connections Reconnect Procedure 208/230/460 VAC machinesOutput Connections WorkTable of Contents Operation SectionOperation Electric Shock can killOperational Features and Controls Design Features AdvantagesGeneral Description Recommended Processes and EquipmentLimitations Controls and SettingsCutting and Gouging Capability Operating Steps ON/OFFCutting Procedure Recommendations Use Pilot Arc ProperlyCutting Thin Gauge Sheet Metal Cutting Expanded Metal Figure B.3 -- Gouging Metal Return to Section TOC Accessories Section Accessories OPTIONS/ACCESSORIESMaintenance Section Section DMaintenance Safety PrecautionsCapacitor Discharge Procedure Procedure DescriptionProcedure Figure D.1 Capacitor Discharge ProcedureRoutine and Periodic Maintenance Perform the following dailyMaintenance PRO-CUT Theory of Operation Section Theory of Operation SectionTheory of Operation Input Line Voltage and Main TransformerOutput Rectification Control and Feedback Figure E.3 Output Rectification, Control and FeedbackHigh Voltage / High Theory of Operation Pilot ARCTransistor Switching Operation Figure E.7 Transistor Switching OperationPulse Width Modulation Thermal ProtectionThermostat Thermal SensorPRO-CUT Troubleshooting & Repair Section Troubleshooting & Repair HOW to USE Troubleshooting GuideTroubleshooting PC Board Troubleshooting Procedures Board can be dam- aged by static electricityTroubleshooting Guide Troubleshooting Guide PRO-CUTConnect ALL Input Disconnect ALL Input Machine Troubleshooting & Repair Function Problems AIR Flow Problems Cutting Problems Control Board Connector Location Power Board Connector LocationCapacitor Discharge Procedure Figure F.19-Capacitor Discharge Procedure Insulated Pliers GlovesTest Description Torch and Cable Resistance Test Procedure WorkFigure F.4 Torch and Cable Resistance Test Points Safety Circuit Test Internal TriggerReturn to Return to Section TOC Figure F.6-Control Board and 4-pin Locations Transistor Module Test Test DescriptionTest Procedure J21 Main Transformer Test Test Procedure Test a Main Secondary Voltage TestCR2 Power Board Test Figure F.11-Power Board Test Points Transistor Module Test Troubleshooting & Repair High Voltage Transformer and Circuit Test Figure F.12-High Voltage Test Component Locations Test C Test Resistance of High Voltage Transformer Secondary ON/OFF Power Switch Removal REMOVAL/REPLACEMENT DescriptionREMOVAL/REPLACEMENT Procedure ➂ ➃ ➄Control Board Removal To Section TOC Power Board Removal Figure F.14-Power Board Removal/Replacement Return to Return to Section TOC 41TROUBLESHOOTING & Repair Transistor Module RemovalRemoval Procedure SCR Module Removal Socket Head CAP Screws Torque to Power Board REMOVAL/ Replacement Procedure FAN Blade and FAN Motor REMOVAL/REPLACEMENT Figure F.17-Fan Blade & Fan Motor To Section TOC Torch Head REMOVAL/REPLACEMENT Figure F.18-Torch Head Removal/Replacement Section TOC Maximum Acceptable Output Voltage AT Minimum Output Setting Retest After RepairInput Idle Amps Recommended Meters for Machine Output TestsPRO-CUT Electrical Diagrams Electrical DiagramsStatus Board Schematic Diagram Bypass Board Schematic Diagram M15603 H E M a T I CBypass Board Schematic Diagram M17322 PRO-CUT Electrical Diagrams Control Board IdentificationPower Board Power Board IdentificationStatus PC Board M15601 StatusStatus PC Board M15601Bypass PC Board M15603 BypassBypass PC Board M15603 Bypass PC Board M17322 Bypass PC Board M17322 Wiring Diagram for Codes 10112 0 , J 2Wiring Diagram for Codes 9819 Control Board Schematic Drawing G2015 Power Board Schematic Design SVM Error Reporting Form