Lincoln Electric SVM149-A service manual Input Board Removal & Replacement

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F-37

TROUBLESHOOTING & REPAIR

F-37

INPUT BOARD REMOVAL & REPLACEMENT (continued)

FIGURE F.17 – INPUT BOARD REMOVAL

Mounting

Screws

Switch

Leads

A B

AC

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AC

CP

Fan

Leads

Multi-colored

Plug

Mounting

Screws

Four Leads

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11.Using a 7mm Nut driver, remove the four mounting nuts from the corners of the Input Board. Be careful not to lose the washer behind each nut. Input Board can be removed after these four nuts are removed.

12.After replacement of the Input Board, replace the four nuts and washers previously removed from the corners of the board. Do Not Over tighten.

13.Using a 7 mm nut driver replace two leads originating from the Input Switch. (A+B)

14.Reconnect four leads in their correct positions. (AC and CP)

15.Reconnect the harness plug.

16.Reconnect the fan leads to the Input Board. Be sure that leads are connected to their original positions.

17.Replace the case wraparound.

18.Replace the plastic nut from around the pressure regulator. Do Not Over tighten.

19.Replace the carry handle.

PRO-CUT 25

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Contents PRO-CUT Safety Cylinder may explode if damaged Précautions DE Sûreté SafetyMaster Table of Contents for ALL Sections PRO-CUT Installation Section Table of ContentsTechnical Specifications PRO-CUT 25 K1756-1 InstallationInput Electrical Connections Safety Precautions Electric Shock can KillSelect Proper Location High Frequency Interference ProtectionGAS Input Connections Torch Output ConnectionsPRO-CUT Table of Contents Operation Section Description Safety PrecautionsPreheat Temperature for Plasma Cutting OperationUser Responsibility Operational Features and ControlsDesign Features Advantages Consumable Life Cutting CapabilityLimitations Controls and SettingsPilot ARC Discussion Apparently wrong, reset the machine by turningGeneral In All Cases Procedure RecommendationsPRO-CUT Accessories General Options Accessories Maintenance Electric Shock can kill Routine MaintenancePRO CUT PRO-CUT Table of Contents Theory of Operation Section Input Line VOLTAGE, and Auxiliary Transformer Theory of OperationGeneral Description Figure E.3 Precharge and Protection Precharge and ProtectionReturn Return to Section TOC Main TransformerFigure E.5 Plasma Output Section and Torch Figure E.6 Control Board Control BoardAccidental Operation Protection Safety PARTS-IN-PLACE ProtectionProtection Circuits Insulated Gate Bipolar Transistor Igbt Operation Table of Contents Troubleshooting & Repair Section HOW to USE Troubleshooting Guide Troubleshooting & RepairPC Board Troubleshooting Procedures Output Problems Function Problems See the Operation section Troubleshooting & Repair LED Function Problems Description Input Filter Capacitor Discharge ProcedureRight Side of Machine Discharge ProcedureMain Inverter Board Resistance Test Right Side of Machine IGBT’s D2 D1 D11 D10 PRO-CUT Input Board Voltage Test Test Points Fan PRO-CUT Main Inverter Board Voltage Test P2 P1 P2 P1 PRO-CUT Torch Continuity and Solenoid Test Torch Continuity and Solenoid Test Torch Continuity and Solenoid Test PRO-CUT AIR/GAS Solenoid Test AIR/GAS Solenoid Test Control Board Removal and Replacement Small Red Cap Screws Over tighten Input Board Removal and Replacement Input Board Input Board Removal & Replacement PRO-CUT Main Inverter Board Removal and Replacement Main Board Main Inverter Board Removal & Replacement PRO-CUT Switch Removal and Replacement PRO FAN Removal and Replacement Fan Do Not Over tighten Machine Input and Output Retest After RepairTable of Contents Electrical Diagrams Section Electrical DiagramsInput Voltage Board Pressure SCHEMATIC- Control Printed Circuit Board Sheet Electrical Diagrams Electrical Diagrams PC Board Assembly Main Inverter Board PC Board Assembly Input Board Cutting Current Path SVM Error Reporting Form