Figure D.1 Component Locations | Lincoln Electric SVM144-B specification

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D-3	MAINTENANCE	D-3
	FIGURE D.1 — COMPONENT LOCATIONS.

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CONTROL PC

BOARD

FAN

MOTOR

ASSEMBLY

SNUBBER

PC BOARD

WIRE DRIVE

ASSEMBLY

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SCR

RECTIFIER

BRIDGE

OUTPUT

CHOKE CAPACITOR

BANK

MAIN

TRANSFORMER

POWER

ENHANCEMENT

CHOKE

POWER MIG 255

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Lincoln Electric SVM144-B service manual Figure D.1 Component Locations

Contents

Power MIG Safety Electric Shock can kill Welding Sparks can cause fire or explosion Safety Sûreté Pour Soudage a L’Arc Précautions DE Sûreté Master Table of Contents for ALL Sections Installation Section Table of Contents Technical Specifications Power MIG Installation Safety Precautions Uncrating the Power MIGLocation Power MIG Figure A.2 Triple Voltage Machine Input Connections Shielding GAS GUN and Cable Installation Section B Operation Section Fumes and Gases can be dangerous OPERATIONB-2 Limitations OperationProduct Description Welding Capability Description of Controls Wire Reel Loading READI-REELS, SPOOLS, or Coils Procedure for Changing Drive and Idle Roll Sets To Start the Welder Feeding Wire ElectrodeSetting RUN-IN Speed on STAN- Dard Power MIG Feeder Idle Roll Pressure Setting Making a Weld Avoiding Wire Feeding Problems Input Line Voltage Protection FAN Control Section C Accessories Section Dual Cylinder Mounting KIT K1702-1 AccessoriesDrive Roll Kits K363P READI-REEL Adapter Operating Instructions For Timer KIT Spool GUN Adapter KIT Making a Weld with the Spool GUN, Spool GUN Installed Section D Maintenance Section Maintenance Routine and Periodic MaintenanceGUN Tubes and Nozzles Figure D.1 Component Locations Liner Removal Replacement Contact TIP and GAS Nozzle Installation To open up the handle 5MAINTENANCED-5 Description English Size Metric Size Table D.2 Section E Theory of Operation Section Theory of Operation Input Line VoltageMain Transformer Feedback Control Output Rectification Figure E.4 Constant Voltage Output Constant Voltage Output Feedback Wire Drive Motor Wire Feed Overload Protection Thermal and Overload ProtectionOvercurrent Protection Figure E.6 SCR Operation SCR Operation Power MIG Section F Troubleshooting & Repair Section HOW to USE Troubleshooting Guide Troubleshooting & Repair Workstations PC Board Troubleshooting Procedures Output Problems SCR Rectifier Rectifier Function Problems Wire Feeding Problems Welding Problems Welding Problems Test Description Main Transformer Test Main Transformer Test Test Procedure Figure F.1 Troubleshooting and Repair Rectifier Diode Bridge Test Test DescriptionMaterials Needed Rectifier Diode Bridge Testing 208R 206 28 VAC 209R Power MIG Static SCR Rectifier Assembly Test Static SCR Rectifier Assembly Test Active SCR Rectifier Assembly Test Power MIG Active SCR Rectifier Assembly Test Active SCR Rectifier Assembly Test Figure F.7 Location Leads X2 Open switch SW-1 Wire Drive Motor and Tachometer Feedback Test Wire Drive Motor and Tachometer Feedback Test 515B 206B 15 VDC 5J1 1J1 Test for Supply Voltage to Tachometer 555 206B To 3.5 VDC 6J1 1J1 Test for Feedback Voltage to Control Board Volts Normal Open Circuit Voltage Waveform Typical Output Voltage Waveform Machine Loaded Machine Loaded to 250 Amps AT 26 VDC Scope Settings Machine Loaded to 220 Amps AT 22 VDC Scope Settings Troubleshooting & Repair Typical SCR Gate Voltage Waveform Power MIG Description Control PC Board Removal and Replacement Procedure Control PC Board Removal and Replacement Procedure Figure F.11 Control Board Mounting Power MIG Wire Drive Assembly Removal and Replacement Procedure 41TROUBLESHOOTING & REPAIRF-41 Procedure Wire Drive Assembly Removal and Replacement TOC Power MIG SCR Output Rectifier Removal and Replacement Procedure SCR Output Rectifier Removal and Replacement Figure F.15 Right Heat Sink Lead Disconnection Power MIG Capacitor Bank Removal and Replacement Procedure Capacitor Bank Removal and Replacement Troubleshooting & Repair Main Transformer and Output Choke Removal and Replacement TOC Power MIG FAN Motor Assembly Removal and Replacement Procedure FAN Motor Assembly Removal and Replacement Open Circuit Voltage Troubleshooting and RepairWire Speed Range Retest After Repair Power MIG Electrical Diagrams Section Wiring Diagram Entire Machine Code 10563 L10979 Power MIG 255 208/230V Wiring Diagram Entire Machine Code 10583 L10980 Power MIG 255 230/460/575V Wiring Diagram Entire Machine Code 10986 L11980 Power MIG 255 230/460/575 Wiring Diagram Entire Machine Code 10990 L11979 Power MIG 255 208/230 Control PC Board Schematic G3520-1D1 3521 Control PC Board Assembly G3521-1 Powermig Display PC Board Schematic L10951 Lincoln Electric CO Display PC Board Assembly L10952-1 24374 S Snubber PC Board Schematic S24374 00 ~.04 Snubber PC Board Assembly M19248-1 SVM Error Reporting Form