Table of Contents | Lincoln Electric SVM114-C guide

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Section F	TABLE OF CONTENTS	Section F
	- TROUBLESHOOTING AND REPAIR SECTION -

Troubleshooting and Repair	Section F
How to Use Troubleshooting Guide	F-2
PC Board Troubleshooting Procedures	F-3
Troubleshooting Guide	F-4
Test Procedures
Gas Solenoid Valve and Solenoid PC Board Test	F-7
Gas Solenoid Valve and Control PC Board Test	F-13
Hall Effect Module Test	F-19
Wire Drive Motor Test	F-23
Contactor & Contactor PC Board Test	F-25
Component Replacement Procedures
Contactor PC Board Replacement	F-31
Control PC Board Replacement	F-35
Contactor Replacement (codes below 10500)	F-39
Contactor Replacement (codes above 10500)	F-41
Gas Solenoid Valve and/or Solenoid
PC Board (If Present) Replacement	F-43
Drive Motor And Gearbox Replacement and
Access to Hall Effect Module	F-47
Retest After Repair	F-51

WARNING

ELECTRIC SHOCK can kill.

•Never work on the inside of the machine without removing the input power. You can receive a life threatening electrical shock if you fail to do this. Only qualified technicians should perform installation, maintenance, and troubleshooting work on the machine.

LN-25™

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Lincoln Electric SVM114-C service manual Table of Contents, Troubleshooting and Repair Section

Contents

Semiautomatic Wire Feeder California Proposition 65 Warnings Safety Electric Shock can kill Fumes and GasesCan be dangerous Welding and Cutting Sparks can Cause fire or explosion Cylinder may explode if damagedIii Sûreté Pour Soudage a L’Arc Précautions DE Sûreté Master Table of Contents for ALL Sections Installation Section Table of Contents Currentrent InstallationTechnical Specifications LN-25 Wire Feed Speed Power Source Connection Safety Precautions For GMA GUN and Cables INVERTEC, CV300 and Other Newer Lincoln Power SourcesGUN Cable Connection to Feeder With CV Adapter Work Cable Connection Wire Feed Drive Roll and Guide Tube KitsWeld Cable Connection Electrode Cable Connection LN-25 Operation Section Operation Welding CapabilityRead and Understand Entire Section Before Operating Machine LN-25 Instruments Controls Electrode Polarity SwitchWire Feed Mode Switch Wire Speed Dial and Range Switch Remote ARC Voltage Control Optional GAS Post PRE-FLOW Timers OptionalWork Clip Lead AWG Mounting 10 to 30 LB Spools Sequence of OperationLoading Electrode Mounting 22 to 30 LB READI-REELCOILS 6OPERATIONB-6 Loading Wire DriveIdle Roll Pressure Setting Grooves READI-REEL Inside Cage Wires Minimum Arc Volts Presetting Wire Feed SpeedSetting Constant Wire Feed Speed CV Mode Setting ARC Sensing Wire Feed Speed CC Mode Making a Weld Figure B.4 VV CC Wire Speed Setting Procedure AT END of Coil WeldingCylinder may explode if damaged Circuit Protection and Automatic Shutdown Overvoltage ShutdownMotor Overload Shutdown Accessories Section C Accessories Section Table C.1 AccessoriesLN-25 Option Chart How to use Table C.1 Optional Accessories K434-1 GAS Flow Timer KITGAS Solenoid KIT K430-2 for Codes LN-25 Contactor KIT K443-1 for Codes K433 Power Source Remote BOXK432 Remote Control Cable Assembly Remote Output Control Options and Control Cable Assemblies K444, K444-1 or K444-2 Remote Voltage Control KIT K439 Remote Extension Cable AssemblyK625, K626, K627 Remote Control Cable Assembly K624-1 42V Remote Output Control Module DIA. Hole Connector Must be Insulated in this AreaTo GUN Switch Connect Leads to Pins a and C Style a Maintenance Section Maintenance Routine MaintenanceAdjusting Speed Sensor Module Calibration of LN-25 Wire Speed Dial LN-25 Theory of Operation Section Figure E.1 Theory of Operation Block Diagram Control Circuit Operation Input Power CircuitTheory of Operation General Description Trigger Circuit Feedback and Control Circuits Later Models Optional CircuitsContactor GAS Solenoid Control PC Board Fuses Protective Devices Circuits LN-25 Troubleshooting and Repair Section HOW to USE Troubleshooting Guide 2TROUBLESHOOTING and REPAIRF-2 PC Board Troubleshooting Procedures Troubleshooting and Repair Feeding Problems Feeding Problems Hall Effect For Codes below 10500 only GAS Solenoid Valve and Solenoid PC Board TestTest Description Materials Needed GAS Solenoid Valve Test ProcedureScrew Wire Reel Retaining Collar Case Door Figure F.2 Solenoid Leads Troubleshooting and Repair PC Board for K430 GAS Solenoid KIT GAS Solenoid Valve and Solenoid PC Board Test512 624A 621 J11 LN-25 For Codes Above 10500 only GAS Solenoid Valve and Control PC Board Test Figure F.5 Control BOX Cover Removal For Codes Above 10500 only Figure F.6. Solenoid Leads Solenoid Leads Control PC Board Solenoid Circuitry Test Figure F.7. Applied Voltage Polarity 667 555 691 621 500 512 690 G3425 LN-25 Hall Effect Module Test Hall Effect Module Test G2196 539 541 500539 G1757 Figure F.11 Control PC Board Codes Above LN-25 Wire Drive Motor Test Drive Motor Lead IN-LINE Connector Hall Effect Module Contactor & Contactor PC Board Test Contactor & Contactor PC Board Test Contactor Test Procedure Contactor Coil Leads S20963 28TROUBLESHOOTING and Repair F-28 Contactor PC Board Test667 J14 LN-25 Tools Required Contactor PC Board Replacement Repair Procedure Contactor PC Board Replacement 33TROUBLESHOOTING and Repair F-33 Figure F.17 Control PC Board Replacement Figure F.21. Control PC Board Codes 9812 and below Control PC Board Replacement J14 Figure F.22. Plug Locations for L12253- Control Board Figure F.24. Control Board Replacement PC Board Screw For Codes below Contactor Replacement Contactor Replacement 40TROUBLESHOOTING and Repair F-40 For Codes Above Figure F.26 Phillips Head Screwdriver Wrench Pliers GAS Solenoid Present ReplacementPurge Switch Leads Solenoid Plug J11 GAS Solenoid Valve AND/OR Solenoid PC Board if Figure F.29. Solenoid Assembly Wiring Codes 9812 and below Figure F.31. GAS Solenoid Assembly for Earlier Codes Phillips Head Screwdriver Wrench Slot Head Screwdriver Mylar Insulation Electrode Cable 48TROUBLESHOOTING and Repair F-48Drive Motor and Gearbox Replacement and Access to Hall Effect Module G1757 Figure F.34. Drive Motor Replacement Retest After Repair LN-25 Table of Contents Electrical Diagrams Section Electrical Diagrams Optional 42 Volt Remote Output Control Wiring Diagram Above Code 11140 G4679 Wiring Diagram Code 10556 Thru 10500 L10925 Wiring Diagram Code 10100 Thru 10500 L9644 Wiring Diagram below Code 9900 L7545 LN-25 Across the ARC Model Schematic Complete Machine Codes Above 11140 G5366 Schematic Complete Machine below Code 9900 only G1833 Schematic Control PC BD Above Code 11140 G4616-5 Schematic Control PC BD Code 10556 Thru 10558 G3424-3 Schematic Control PC BD Code 10100 Thru 10500 G2194 PC Board Assembly Control Abovr Code 11140 L12253-3 L12253L12253-3 G3425 PC Board Assembly Control Code 10556 Thru 10558 G3425-3 PC Board Assembly Control Code 10100 Thru 10500 G2196-1 LN-25 Control PC Board Assembly Control below Code 9900 G1757-6 Contactor Schematic Contactor PC BD Above Code 10500 M10965 Schematic Contactor PC BD Code 10100 Thru 10500 M17621 Electrical Diagrams Electrical Diagrams L10863 PC Board Assembly Contactor Above Code 10500 L10863-1 PC Board Assembly Contactor Code 10100 Thru 10500 L9670-1 PC Board Assembly Contactor below Code 9900 L9185-2