Lincoln Electric SVM161-A specification

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F-42	TROUBLESHOOTING AND REPAIR	F-42

SECONDARY OUTPUT BOARD ASSEMBLY TEST (continued)

TABLE F.14 – OUTPUT DIODE RESISTANCE CHECK

MODE	POSITIVE METER	NEGATIVE METER	EXPECTED READING
	PROBE	PROBE

MACHINE OFF	TEST POINT A	TEST POINT 3	LOW - LESS THAN 200 OHMS

MACHINE OFF	TEST POINT 3	TEST POINT A	HIGH - MORE THAN 1000 OHMS

MACHINE OFF	TEST POINT B	TEST POINT 3	LOW - LESS THAN 200 OHMS

MACHINE OFF	TEST POINT 3	TEST POINT B	HIGH - MORE THAN 1000 OHMS

MACHINE OFF	TEST POINT 2	TEST POINT A	LOW - LESS THAN 200 OHMS

MACHINE OFF	TEST POINT A	TEST POINT 2	HIGH - MORE THAN 1000 OHMS

MACHINE OFF	TEST POINT 2	TEST POINT B	LOW - LESS THAN 200 OHMS

MACHINE OFF	TEST POINT B	TEST POINT 2	HIGH - MORE THAN 1000 OHMS

INVERTEC® V205-T AC/DC™

Image 82

Lincoln Electric SVM161-A service manual Mode Positive Meter Negative Meter Expected Reading Probe

Contents

Invertec V205-T AC/DC Safety Invertec V205-T AC/DC Electric Shock can kill ARC Rays can burn Can be dangerous Cylinder may explode Powered equipmentWelding Cutting Sparks can cause fire or If damaged Explosion Précautions DE Sûreté Sûreté Pour Soudage a L’Arc Safety Methods of Reducing Emissions Mains Supply Master Table of Contents for ALL Sections Table of Contents Installation Section Installation Operating Temperature Range Storage Temperature Range Tilting Select Suitable LocationStacking Environmental Area Reconnect Procedure Input Connections 115V Input Attachment Plug Installation230V Input Engine Driven Generator Output and GAS Connection for TIG Welding Figure A.1 Output ConnectionsWork Cable Connection Remote Control Connection Shielding GAS Connection Invertec V205-T AC/DC Table of Contents Operation Section General Description Safety InstructionsOperation Welding Capability OPERATIONB-3 Rear Control Panel Figure B.1 Controls and Settings Figure B.2 Step Diagram Local/Remote push button Selects the welding TIG DC TIG AC SET UP Menu Indicator Parameter Default Output Limitations Welding Polarity Figure B.7 Tips for AC TIG Welding Steel TIG WeldingCopper TIG Welding Filler Material AC TIG Welding Quick Start UP Protective GAS DC TIG Welding Quick Start UP Table of Contents Accessories Section Compatible Equipment AccessoriesOptional Accessories Cable Plugs Table of Contents Maintenance Section Input Filter Capacitor Discharge Procedure MaintenanceSafety Precautions Routine Maintenance 3MAINTENANCE Figure D.1 Major Component Locations Invertec V205-T AC/DC 1TABLE of CONTENTS-THEORY of Operation Section E-1 Theory of Operation Input Board and BUS Board Main Igbt Inverter Board Figure E.3 Main Igbt Inverter Board Output Module and Clamping Board Main TransformerOutput Module Transistor Board Superimposition Board High Frequency HF Board CONTROL/DISPLAY BoardOutput Filter Board Insulated Gate Bipolar Transistor Igbt Operation Passive Active 1TABLE of Contents Troubleshooting and Repair F-1 Troubleshooting and Repair HOW to USE Troubleshooting Guide PC Board Troubleshooting Procedures Electric Shock can kill Igbt Perform the Input Filter Board Igbt Inverter Board Test Secondary Output Board Assembly Test See the Output Filter Troubleshooting and Repair External Diagnostics Display Troubleshooting and Repair Internal Diagnostics Figure F.2 Internal Diagnostics LED Invertec V205-T AC/DC Test Description Materials Needed Input Filter Capacitor Discharge Procedure Capacitor Solder Resistor Pads Input Filter Board Test Input Filter Board Test ProcedureInput Filter Board Input Filter Board Invertec V205-T AC/DC Main Igbt Inverter Board LOW Voltage Test Main Igbt Inverter Board LOW Voltage Test Figure F.6 Main Igbt Inverter Board Location Main Igbt Inverter Board LOW Voltage Test LED TP2 MF2 Figure F.7 Main Igbt Inverter Board Location CONTROL/DISPLAY Board Test CONTROL/DISPLAY Board Test Figure F.8 CONTROL/DISPLAY Board Location CN2 Figure F.9 CONTROL/DISPLAY Board Location CN1 Figure F.10 Plugs CN1, CN2 & CN7 BUS Board Test BUS Board Test Figure F.11 BUS Board Location Table F.7 Plug CN4 Test Points Table F.5 Plug CN2 Test PointsTable F.6 Plug CN3 Test Points Table F.8 Plug CN7 Test Points CN1 CN2 Main Inverter Board Power Factor Section Test Table F.10 Voltage Checks with 115 VAC Applied to Machine Main Inverter Board Power Factor Section TestTable F.11 Resistance Checks TP9 Gndpwr RL1 Invertec V205-T AC/DC Output Filter Board Test Output Filter Board Test Figure F.16 Output Filter Board Location Figure F.17 Output Filter Board Plug Location Figure F.18 Output Filter Board Plug CN1 Invertec V205-T AC/DC Secondary Output Board Assembly Test Secondary Output Board Assembly Test Figure F.19 Secondary Power Board Location OFF GA-SA Mode Positive Meter Negative Meter Expected Reading Probe Table F.14 Output Diode Resistance Check Main Inverter Board Welding Logic and Inverter Section Test Main Inverter Board Welding Logic and Inverter Section Test Table F.15 LED Function Table F.16 Feedback Voltage SignalsTable F.18 LED Check in Stick Mode Table F.17 Voltage Checks with 115 VAC Applied to Machine Figure F.22 Main Board Inverter Section TP9 Ground Power Invertec V205-T AC/DC Input Filter Board Removal and Replacement Input Filter Board Removal and Replacement Figure F.24 Input Filter Board Location RV1 RV2 Invertec V205-T AC/DC Main Igbt Board Removal and Replacement Main Igbt Board Removal and Replacement Figure F.27 Main Igbt Board Location RV1 RV2 CN4 RV3 RV4 CN5 RV5 RV7 RV6 Invertec V205-T AC/DC CONTROL/DISPLAY Board Removal and Replacement CONTROL/DISPLAY Board Removal and Replacement Figure F.29 CONTROL/DISPLAY Board Location CN2 Invertec V205-T AC/DC Output Filter Board Removal and Replacement Removal and Replacement Figure F.32 Output Filter Board Location Phillips Head Screws CN1 Output Diodes Removal and Replacement Output Diodes Removal and Replacement To Replace ANY of the Output Diodes D1, D2, D3 or D4 Output Transistor Removal and Replacement Output Transistor Removal and Replacement Figure F.36 Output Transistor Location Plug CN1 5mm Allen Bolts Invertec V205-T AC/DC Table of Contents Diagram Section ELECTriCaL DiaGramS