Lincoln Electric SVM141-A service manual PC Board Troubleshooting Procedures

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F-3

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TROUBLESHOOTING & REPAIR

PC BOARD TROUBLESHOOTING PROCEDURES

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WARNING

ELECTRIC SHOCK can kill.

Have an electrician install and service this equipment. Turn the input power OFF at the fuse box before working on equipment. Do not touch electrically hot parts.

CAUTION: Sometimes machine failures appear to be due to PC board failures. These problems can some- times be traced to poor electrical connections. To avoid problems when troubleshooting and replacing PC boards, please use the following procedure:

1.Determine to the best of your technical ability that the PC board is the most likely component causing the failure symptom.

2.Check for loose connections at the PC board to assure that the PC board is properly connected.

3.If the problem persists, replace the suspect PC board using standard practices to avoid static elec- trical damage and electrical shock. Read the warn- ing inside the static resistant bag and perform the following procedures:

PC Board can be damaged by static electricity.

•Remove the PC Board from the static-shielding bag and place it directly into the equipment. Don’t set the PC Board on or near paper, plastic or cloth which could have a static charge. If the PC Board can’t be installed immediately, put it back in the static-shielding bag.

•If the PC Board uses protective shorting jumpers, don’t remove them until installation is complete.

•If you return a PC Board to The Lincoln Electric Company for credit, it must be in the static-shielding bag. This will prevent further damage and allow prop- er failure analysis.

4.Test the machine to determine if the failure symp- tom has been corrected by the replacement PC board.

NOTE: It is desirable to have a spare (known good) PC board available for PC board troubleshooting.

NOTE: Allow the machine to heat up so that all electri- cal components can reach their operating temperature.

5. Remove the replacement PC board and substitute

it with the original PC board to recreate the original

problem.

a. If the original problem does not reappear

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ATTENTION Static-Sensitive Devices Handle only at Static-Safe Workstations

Reusable

Container

Do Not Destroy

•Remove your body’s static charge before opening the static-shield- ing bag. Wear an anti-static wrist strap. For safety, use a 1 Meg ohm resistive cord connected to a grounded part of the equipment frame.

•If you don’t have a wrist strap, touch an unpainted, grounded, part of the equipment frame. Keep touching the frame to pre- vent static build-up. Be sure not to touch any electrically live parts at the same time.

•Tools which come in contact with the PC Board must be either con- ductive, anti-static or static-dissi- pative.

by substituting the original board, then the

PC board was not the problem. Continue

to look for bad connections in the control

wiring harness, junction blocks, and termi-

nal strips.

b. If the original problem is recreated by the

substitution of the original board, then the

PC board was the problem. Reinstall the

replacement PC board and test the

machine.

6. Always indicate that this procedure was followed

when warranty reports are to be submitted.

NOTE: Following this procedure and writing on the warranty report, “INSTALLED AND SWITCHED PC BOARDS TO VERIFY PROBLEM,” will help avoid denial of legitimate PC board warranty claims.

SQUARE WAVE TIG 275

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Contents Square Wave TIG Safety Depends on YouSquare Wave TIG SafetyARC Rays can burn Electric Shock can killFumes and Gases can be dangerous Iii Cylinder may explode if damagedSûreté Pour Soudage a L’Arc Précautions DE SûretéMaster Table of Contents for ALL Sections Table of Contents Installation Section Technical Specifications Square Wave TIG InstallationSafety Precautions Figure A.1 Input Supply ConnectionsReturn to Section TOC To Section TOC Input Reconnect ProcedureTable A.1 User Supplied ConnectorsOutput Connections Work Cable ConnectionCylinder could explode if damaged TIG Torch ConnectionTWIST-MATE Adapter for LW-18 and LW-20 TIG Torch TWIST-MATE Adapter for LA-9 and LA-17 TIG TorchCompleted Assembly Square Wave TIG Table of Contents Operation Section Welding Sparks can cause fire or explosion OperationElectric Shock can kill Fumes and Gases can be dangerousGeneral Description Design Features AdvantagesRecommended Processes and Equipment Limitations Welding CapabilityFigure B.1 Control Panel Controls and SettingsTwist Mate Electrode Welding OperationTIG Welding TIG Welding GuidelinesTable B.2 Recommended Polarity Settings for TIG Welding TIG Welding Sequence of Operation 2-Step TIG ModeTIG Welding Sequence of Operation 4-Step TIG Mode Hand and Foot Amptrol Operation Advanced TIG Welding FeaturesAC Wave Balance and Auto Balance 50/60 Hertz European Machines Auxiliary PowerStick Welding Hertz Domestic MachinesSquare Wave TIG Section C-1Section C-1 Table of Contents AccessoriesOptional Accessories Accessories Included with MachineK963-1, -2 Hand Amptrol Table of Contents Maintenance Section Routine and Periodic Maintenance MaintenanceOverload Protection Display PC BOARD, ARC STARTER/BYPASS PC Board Component Location and AccessSpark GAP ASSEMBLY, High Voltage Transformer Control PC BoardFigure D.2 Major Component Locations Table of Contents Theory of Operation Section Theory of Operation Input Power CircuitFigure E.3 Output RECTIFICATION, Control Board and Feedback Output Rectification Control Board and FeedbackFigure E.4 High Voltage / High Frequency Circuit High Voltage / High Frequency CircuitFigure E.5 DC Welding Output DC Welding OutputFigure E.7 AC Welding Output AC Welding OutputFigure E.9 SCR Operation SCR OperationThermal Protection Protective CircuitsOverload Protection Table of Contents Troubleshooting & Repair Section High Voltage / High Frequency can damage test equipment Troubleshooting & RepairHOW to USE Troubleshooting Guide Disable ProcedurePC Board can be damaged by static electricity PC Board Troubleshooting ProceduresObserve Safety Guidelines Troubleshooting GuideDetailed in the beginning of this manual Perform the SCR Bridge Test Troubleshooting & Repair Connections Troubleshooting Guide Troubleshooting & Repair TIG Welding Problems Can Kill Electric ShockTroubleshooting & Repair To Technical Specifications Stick Welding Problems 15F-15 Function ProblemsFunction Problems Installation Troubleshooting & Repair Test Description High Frequency Circuit Disable ProcedureMaterials Needed Procedure High Frequency Circuit Disable ProcedureT1 Main Transformer Test T1 Main Transformer Test Test ProcedureReplace the case side covers Primary WINDINGS1 Test PointsGAS Water Solenoid Test Figure F.3 GAS Solenoid Location GAS Water Solenoid TestStatic SCR Test Figure F.4 Plug J1 Location on Control Board Static SCR TestAssembly Removal and Replacement Description Active SCR TestFigure F.6 Plug J1 Location on Control Board Active SCR TestFigure F.7 Active SCR Test Setup SCR Bridge Assembly Removal and Replacement Scope Settings AC TIG ModeNormal Open Circuit Voltage Waveform DC TIG Mode AC Stick Mode DC Stick Mode Machine Loaded to 255 Amps Typical Output Voltage Waveform Machine LoadedAT 30 VAC AT 31 VDC Machine Loaded to 275 AmpsAC Stick Mode DC Stick Mode 50 V/Div High Voltage Transformer Removal Replacement Removal Procedure ReplacementHigh Voltage Transformer Removal Figure F.10 High Voltage Transformer Mounting Insulators Replacement ProcedureSCR Bridge Assembly Removal and Replacement Using the 3/8 nut driver, remove the case SCR Bridge Assembly Removal and ReplacementFigure F.13 SCR Bridge Connections Refer to Figures F.11 F.13 Polarity Switch Removal and Replacement Allen Screw Control Knobs Polarity Switch Handle Polarity Switch Removal and Replacement253 POS Micro Switch Leads Square Wave TIGFigure F.16 Polarity Switch Wiring Diagram For Steps 9--17, see Figure F.15 and F.16 Replacement ProcedureDescription Removal and Replacement Main Transformer and Output Choke AssemblyFigure F.18 Transformer Connections POS Micro Switch Leads Figure F.19 Polarity Switch Connections Choke NEGRefer to Figures F.17 F.19 Reassembly ProcedureOpen Circuit Voltages Minimum Acceptable Output Voltage AT Maximum Output SettingRetest After Repair Input Idle AmpsSquare Wave TIG Section G TIG WiringDiagram L10747 ElectricalSquarewave Diagram L10747-2Control Board Schematic G3358-1 Electrical DiagramsOCI4 TRI3 MT2 Control Board Schematic G3358-2Return to Section Return to Section TOC To Section TOC Display Board Schematic L10768Bypass L10770-17-24-98 Display Board Layout L10770-1XXX 10G-10 Bypass Board Layout L10121-1Square Wave TIG

SVM141-A specifications

The Lincoln Electric SVM141-A is a cutting-edge solution designed for operators requiring precision, efficiency, and versatility in their welding applications. This machine is known for its compact form but robust feature set, making it an ideal choice for both professional welders and industrial applications.

One of the standout features of the SVM141-A is its advanced inverter technology. This innovation allows for a stable arc, providing consistent results even under varying conditions. The machine minimizes power consumption, making it energy-efficient without compromising performance. The inverter technology also supports a wider input voltage range, making the SVM141-A suitable for use in diverse environments and job sites.

Another key characteristic is its multi-process capability. The SVM141-A supports MIG, stick, and TIG welding processes, providing flexibility for various welding tasks. This versatility enables operators to tackle different materials, including mild steel, stainless steel, and aluminum, making it a valuable tool for numerous projects.

The user-friendly interface of the SVM141-A includes an intuitive digital display, which allows welders to adjust settings with ease. This feature is crucial for ensuring the right configurations for specific welding tasks, reducing the chances of errors and enhancing the overall finish of welds.

Safety is also a priority with the Lincoln Electric SVM141-A. It comes with built-in safety features such as overheat protection and automatic shutdown, ensuring operator safety and equipment longevity. The machine's lightweight design enhances portability, allowing it to be used in various workspaces with ease.

Durability is another hallmark of the SVM141-A. Constructed with high-quality materials, the machine is designed to withstand the rigors of demanding work environments. This ensures reliability over time, providing consistent performance even under heavy use.

In summary, the Lincoln Electric SVM141-A is a versatile, efficient, and user-friendly welding machine that appeals to a wide range of users. Its advanced inverter technology, multi-process capabilities, safety features, and durable construction make it a strong contender in the welding market, suitable for both professionals and hobbyists alike. Whether it’s for light fabrication, repairs, or industrial welding tasks, the SVM141-A meets diverse needs with precision and reliability.
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