CAPACITOR-CEMO,4700P,50V,10% | Lincoln Electric SVM100-A specs

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G-7

PROTECTION/SNUBBER BOARD (L9255)

Item	Identification

C23,C24,C25,C26	CAPACITOR-CEMO,4700P,50V,10%
J15	CONNECTOR,MOLEX,MINI,PCB,6-PIN
J14	CONNECTOR,MOLEX,MINI,PCB,8-PIN

L1,L2,L3,L4,L5,L6,L7,	CHOKE-390UH,5%,225MA,CONFORMAL
L8,L9,L10,L11

R1,R2,R3,R4	RESISTOR-CC,2W,47,10%
J11	CONNECTOR,MOLEX,MINI,PCB,10-PIN
J10	CONNECTOR,MOLEX,MINI,PCB,12-PIN
J12	CONNECTOR,MOLEX,MINI,PCB,14-PIN
J13	CONNECTOR,MOLEX,MINI,PCB,16-PIN

C1,C2,C3,C4,C5,C6,	CAPACITOR-CD,.0047,3000V,20%
C7,C8,C9,C10,C11,
C12,C13,C14,C15,
C16,C17,C18,C29

C19,C20,C21,C22	CAPACITOR-PEF,0.68,400V,10%
L12,L13,L14,L15,L16	CHOKE-RF,390UH,10%,1A,SLEEVED
TP1,TP2,TP3,TP4	MOV-150VRMS,45J,14MM
TP5	MOV-320VRMS,160J,20MM
C27,C28	CAPACITOR-PEF,0.1,400V,10%
R5,R6	RESISTOR-MF,1/4W,26.7,1%

NOTE: Lincoln Electric assumes no responsibility for liabilities resulting from board level troubleshooting. PC Board repairs will invalidate your factory warranty. Individual Printed Circuit Board Components are not avail- able from Lincoln Electric. This information is provided 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.

SQUARE WAVE TIG 255

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Lincoln Electric SVM100-A service manual CAPACITOR-CEMO,4700P,50V,10%

Contents

Square Wave TIG Electric Shock can kill SafetyARC Rays can burn Fumes and Gases can be dangerous Welding Sparks can cause fire or explosion Cylinder may explode if damaged May be dangerous Electric and Magnetic Fields Sûreté Pour Soudage a L’Arc Précautions DE Sûreté Master Table of Contents for ALL Sections Installation Section Table of Contents Technical Specifications Square Wave TIG Installation High Frequency Interference Protection Safety PrecautionsSelect Suitable Location Stacking Input Connections Ground ConnectionInput Supply Connections Reconnect Procedure Output ConnectionsTIG Torch Connection Stick Electrode Cable Connection Table A.1 Operation Section Operating Instructions OperationGeneral Warnings Fumes and Gases Section TOC While Weld ING TIG Gtaw Single Phase Polarity Do not Switch AC & DC Recti Fier Power SourceWork Connec Coolant Tion Output Operational Features and Controls Design Features AdvantagesGeneral Description Recommended Processes and Equipment Limitations Welding Capability Control Panel Keys Controls and Settings Load Case Front Controls Table B.1 Recommended Polarity Settings for TIG Welding Accessory Operation TIG WeldingHand and Foot Amptrol Welding Operation TIG Welding Guidelines TIG Welding Sequence Operation 2-STEP Mode Table B.2 Typical Current Ranges 1 for Tungsten ElectrodesSquare Wave TIG 255 12/95 TIG Welding Sequence Operation 4-STEP Mode Advanced TIG Welding Features Auxiliary PowerALL Machines AC Wave Balance and Auto Balance Overload Protection Square Wave TIG Accessories Section Options / Accessories AccessoriesInstallation of Field Installed Options Undercarriage Function Maintenance Section Maintenance MaintenanceRoutine and Periodic Maintenance Safety Precautions Figure D.1 General Assembly Exploded View Square Wave TIG Theory of Operation Section Power Supply Block Logic Diagram Input Line Voltage and Main Transformer Theory of Operation Output Rectification and Feedback Control High Voltage / High Frequency Circuit DC Welding Circuit DC Welding Output AC Welding Circuit AC Welding Output SCR Operation Square Wave TIG SCR Operation Thermal Protection Troubleshooting & Repair Section HOW to USE Troubleshooting Guide 1TROUBLESHOOTING & Repair PC Board Troubleshooting Procedures Troubleshooting & Repair Output Problems Troubleshooting Guide 12/95 Square Wave TIG Troubleshooting & Repair Problems Symptoms Possible Areas of MisadjustmentsRecommended Course of Action Function Problems Troubleshooting Guide Troubleshooting & Repair TIG Mode Problems Troubleshooting & Repair Troubleshooting Guide TIG Welding Problems Troubleshooting & Repair Stick Welding Problems Figure F.1 Control Board Connectors PC Board Connector Locations Control Transformer T2 Voltage Test Test DescriptionMaterials Needed Control BOX Test Procedure Figure F.4 Control Board and Transformer Control Transformer T2 Voltage Test PROTECTION/SNUBBER Board Continuity Test PROTECTION/SNUBBER Board Continuity Test Table F.6 Square Wave TIG Figure F.6 PROTECTION/SNUBBER Board Test Points ARC Start Trigger Circuit Test ARC Start Trigger Circuit Test Figure F.9 PROTECTION/SNUBBER Board Test Points Static SCR Test Figure F.11 Protection Board Plug Locations Static SCR Test Active SCR Test Figure F.13 PROTECTION/SNUBBER Board Plug Locations Active SCR Test Silicon Controlled Rectifier Test Battery Test Scope Settings Normal Open Circuit Voltage Waveform DC Stick Mode Normal Open Circuit Voltage Waveform AC Stick Mode Normal Open Circuit Voltage Waveform DC TIG Mode Normal Open Circuit Voltage Waveform AC TIG Mode Machine Loaded to 200 Amps AT 50 VDC Typical Output Voltage Waveform Machine Loaded DC TIG Mode AC TIG Mode Auto Balance on Machine Loaded to 50 Amps AT 26VACMachine Loaded to 200 Amps AT 46 VAC Typical SCR Gate Voltage Waveform Volts 5ms Volts 2ms Troubleshooting & Repair Tools Required FAN Motor and Blade Removal FAN Motor and Blade Removal Materials Required SCR Heat Sink Assembly Removal SCR Heat Sink Assembly Removal Retest After Repair Input Idle AmpsRecommended Meters for Machine Output Tests Figure F.16 Transformer Lead Test Points Retest After Repair cont’d Electrical Diagrams Electrical Diagrams PTC1,PTC2 THERMISTOR-PTC,56 OHMS,90MA Control Board G2150 Control Board G2150 cont’d Square Wave TIG PROTECTION/SNUBBER Board L9255 CAPACITOR-CEMO,4700P,50V,10% Square Wave TIG Wiring Diagram Square Wave TIG 6 a 0 a 7 a 8 a 3 C Machine Schematic Square Wave TIG A C C T G2150 Y P a D Control Board Schematic Square Wave TIG 255 cont’d G2150 PROTECTION/SNUBBER Board Schematic Square Wave TIG 255 L9255 Keypad LED Board Square Wave TIG 255 L9212