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Lincoln Electric SVM101-B PC Board Assembly Switch L8441, CAPACITOR, Cemo 2700P 50V 5%

Models: SVM101-B

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G-16	ELECTRICAL DIAGRAMS	G-16
PC BOARD ASSEMBLY - SWITCH - (L8441)

Item	Description	Item	Description
A1	ELECTRONIC MODULE ASSEMBLY	R2, R4	RESISTOR-MF, .25W 1% 221 ohm
A2	ELECTRONIC MODULE ASSEMBLY	R6, R8, R9, R17, R19,	RESISTOR-MF, .25W 1% 10.0 ohm
B1, B2, B3, B4, B5, B6,	CONNECTOR, tab QC edge offset	R25, R26, R27, R33, R34
B7, B8, B9, B10, B11,	1/4”	R7, R30	RESISTOR-MF, .25W 1% 1.50K ohm
B12		R10, R32	RESISTOR-MF, .25W 1% 15.0K ohm
C1, C5, C6, C7	CAPACITOR,CEMO .022 50V 20%	R11, R15, R22, R28	RESISTOR-CC, .50W 5% 1 ohm
C2, C8	CAPACITOR, CEMO 2700P 50V 5%	R12, R14, R20, R21	RESISTOR-MF, .25W 1% 1.00K ohm
C3, C4	CAPACITOR-PPF, .047 1200V 5%	R13, R31	RESISTOR-MF, .25W 1% 20.0 ohm
D1, D2, D3, D4, D5, D6,	DIODE, AXLDS 1A 400V FR 1N4936	R16, R23	RESISTOR-MF, .25W 1% 22.1K ohm
D7, D8, D9, D10		R18, R29, R37, R42	RESISTOR-MF, .25W 1% 475 ohm
DZ1, DZ2, DZ3, DZ12	DIODE, Zener 1W 10V 5% 1N4740A	R35, R36	RESISTOR-MF, .25W 1% 47.5 ohm
DZ4, DZ7	DIODE, Zener 1W 15V 5% 1N4744A	R38, R39, R40, R41	RESISTOR-MF, .25W 1% 39.2K ohm
DZ5, DZ6, DZ8, DZ9	DIODE, Zener 1W 6.2V 5% 1N4735A
Q1, Q2, Q3, Q10	TRANSISTOR-NMF, 4PDIP 1A 100V	NOTE: Individual parts listed are not available from Lincoln Electric.
	RFD110
Q4, Q12	TRANSISTOR-N, T226 0.5A 40V
	2N4401
Q5, Q6, Q7, Q8, Q9, Q11	TRANSISTOR-P, T226 0.5A 40V
	2N4403
R1, R3, R5, R24	RESISTOR-MF, .25W 1% 100 ohm

NOTE: Lincoln Electric assumes no responsibility for liablilities resulting from board level troubleshooting. PC Board repairs will invalidate your factory warranty. Individual Printed Circuit Board Components are not available from Lincoln Electric. This information is pro- vided for reference only. Lincoln Electric discourages board level troubleshooting and repair since it may compromise the quality of the design and may result in danger to the Machine Operator or Technician. Improper PC board repairs could result in damage to the machine.

V300-I

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Lincoln Electric SVM101-B service manual PC Board Assembly Switch L8441, CAPACITOR, Cemo 2700P 50V 5%

Contents

Invertec Safety Electric Shock can kill ARC Rays can burnFumes and Gases can be dangerous Safety Welding Sparks can cause fire or explosionCylinder may explode if damaged IiiPrécautions DE Sûreté Sûreté Pour Soudage a L’ArcMaster Table of Contents for ALL Sections Table of Contents Installation SectionSection A-1 Installation Three Phase Single Phase3INSTALLATIONA-3 Product Description Electrical InstallationInput Voltage Setup LocationPower Input Connection Connection of Wire Feeders to the InvertecSingle Phase Input Three Phase InputRemote Control of Invertec K900-1 DC TIG Starter ConnectionParallel Operation 6INSTALLATIONA-6 Output CablesQuick Disconnect Plugs Operation Section Section B-1Operation Operating InstructionsDuty Cycle Control Function / OperationMode Switch Full Range Is Is Very Soft, 10 Is Very CrispMeter Polarity Switch Auxiliary PowerAccessories Section Section C-1Accessories Options / AccessoriesMaintenance Section Section D-1Maintenance Input Filter Capacitor Discharge ProcedurePreventive Maintenance Overload ProtectionFigure D.2 Location of Maintenance Components Theory of Operation Section Section E-1Theory of Operation Input Line Voltage & Auxiliary TransformerPrecharge & Protection Circuits Return to Return to Section TOCSwitch Boards Figure E-4 ---SWITCH Circuits & TransformerOutput and Control Circuits Figure E-5 --OUTPUT & Control CircuitsPassive Pulse Width Modulation Minimum OutputMaximum Output Protective Circuits Overload ProtectionThermal Protection Troubleshooting & Repair Section Section F-1Troubleshooting & Repair HOW to USE Troubleshooting GuidePC Board Troubleshooting Procedures Additional Information Oscilloscope Warning Input Filter Capacitor CONDITION- INGMatched Parts Feeding Problems DepartmentFeeding Problems See Input Rectifier test See Output Diodes test See Switch Board test V300-I 11TROUBLESHOOTING & REPAIRF-11 Input Filter Capacitor Discharge ProcedureInput Filter Capacitor Discharge Procedure Figure F.I Location of Input Filter Capacitor TerminalsOutput Pilot Circuit Test Test Procedure G2527 J2 J4 J3V300-I Protection Board Output Test Test Procedure Turn Power Switch OFF313 306 J15 275F 311 V300-I Protection Figure F.6 Inserting ProbesCapacitor Balance Test Static Capacitor Test 912 V300-I Switch Board Test Switch Board Test Switch Board Test Table F.3 Snubber Resistor Test Snubber Resistor Test Check Test Result Conclusion Next Test Step Repair ActionOutput Diode Test Test Procedure Output Diode TestInput Rectifier Test Table F.5 Points StepsProbe Acceptable Meter Reading Overcurrent Protection Current Trigger Test Overcurrent Protection Current Trigger Test 302 G2527 Control J1 275DControl Overvoltage Protection DC Trigger Circuit Test Overvoltage Protection DC Trigger Circuit Test Figure F.16 PC Boards Removed306 275F 309 310 1J8 #311 1J14 6J6 #302 #313 #275D3J8 2J14 1J6 #301 #305Thermal Protection AC Trigger Circuit Figure F.20 PC Boards Moved for Access Thermal Protection AC Trigger CircuitFigure F.21 Thermal Protection AC Trigger Circuit V300-I Power Board Test Power Board Test Test aTest B Figure F.23 Power Board Test Points Simplified Trigger Circuit Capacitor Removal and Replacement Procedure Capacitor Removal and Replacement ProcedureFigure F.27 -- Removing Capacitor Nuts Figure F.27 Switch Board Removal and Replacement Procedure Switch Board Replacement ProcedureTest After Switch Board or Capacitor Replacement Test After Switch Board or Capacitor Replacement Perform Retest After RepairOutput Diode Replacement Procedure 60TROUBLESHOOTING & REPAIRF-60 Output Diode Replacement Procedure61TROUBLESHOOTING & REPAIRF-61 Procedure Diode ModulesRetest After Repair OCV at rated Input V300-PROOutput Min. Acceptable Max. All Modes V300-I V300-PROElectrical Diagrams Section Section G-1Wiring Diagram Entire Machine Code 9826 L8657 #0#Wiring Diagram Entire Machine Code 9827 L8938 ReturnWiring Diagram Entire Machine Code 10036 L9299 Wiring Diagram Entire Machine Code 10037 L9300 $ $Wiring Diagram Entire Machine Code 10132 L9567 SectionWiring Diagram Code Wiring Diagram Entire Machine Code 10133 L9568Wiring Diagram Entire Machine Code 10258 L10189 $& $V300-I Wiring Diagram European Wiring Diagram Entire Machine Code 10336, 10450 L10205Schematic Entire Machine # . $ #$ !#$ #! %&$Schematic Driver PC Board S20216 PC Board Assembly Driver L8660 IdentificationSchematic Driver PC Board S20799 PC Board Assembly Driver DescriptionSchematic Switch PC Board L8440 PC Board Assembly Switch L8441 CAPACITOR, Cemo 2700P 50V 5%Schematic Switch PC Board L10956 PC Board Assembly Switch L10958-1 Reqd IdentificationSchematic Control PC Board G2525 Electrical Diagrams CAPACITOR, Cemo 150P Schematic Protection PC Board M16097 PC Board Assembly Protection L7915-2 DZ1Schematic Power PC Board M16018 PC Board Assembly Power L8033-7 VOLT. REG. & Heat Sink Asbly