Lincoln Electric SVM103-A service manual Procedure Diode Bridge Removal and Replacement

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F-28

TROUBLESHOOTING & REPAIR

CAPACITOR AND/OR DIODE BRIDGE REMOVAL AND REPLACEMENT

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PROCEDURE - DIODE BRIDGE REMOVAL AND REPLACEMENT

1.To remove the diode bridge, first you will have to remove the field capacitor. Follow Steps 1 - 5 on capacitor removal and replacement procedure.

2.Depress the retainer clip on the molded plastic holder and slide the diode bridge out.

3.With the needle nose pliers, gently remove the 4 wires from the diode bridge.

4.Replace the wires to their appropriate loca- tions on the new diode bridge:

Lead 200 (Red) attaches to the positive (+) terminal. Depending on the bridge used, this corner may be beveled and/or marked with a + sign.

Lead 201 (Black) and 201B (Green) are pig- gybacked on the negative (-) terminal, which will always be located diagonally across from the positive (+) terminal.

The 2 Blue leads are the AC side of the bridge and attach to the other two corners. Either lead can go on either terminal.

5.Slide the bridge back into the molded plas- tic holder until the retainer clip snaps it securely in place. Snap the capacitor back into the holder and then slide the unit back into position in the panel.

6.Check that the leads are not grounded and for clearance and tightness.

7.Replace the top cover of the control box and tighten the 4 sheet metal screws with the 5/16” nut driver.

POWER-ARC 4000

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Contents POWER-ARC TM4000 POWER-ARC SafetyElectric Shock can kill Iii Welding Sparks can cause fire or explosionPrécautions DE Sûreté Master Table of Contents for ALL Sections Table of Contents Installation Section Technical Specifications POWER-ARC InstallationSafety Precautions Location and VentilationStoring PRE-OPERATION Engine Service Electrical Output Connections Power ARCWelding Cable Connections Cable Size and LengthCable Installation Auxiliary Power ReceptaclesMachine Grounding Plugs and HAND-HELD EquipmentCircuit Breakers Premises WiringType Common Electrical Devices Possible Concerns Table A.2 Electrical Device USE with the POWER-ARCTable of Contents Operation Section Operation Safety InstructionsOperating Instructions General DescriptionDesign Features Advantages Operational Features and ControlsRecommended Applications Welding CapabilityGENERATOR/WELDER Controls Controls and SettingsGasoline Engine Controls Figure B.2 Gasoline Engine ControlsEngine Operation Before Starting the EngineStarting the Engine Stopping the Engine Running the EngineBREAK-IN Period To USE the Generator AS AN Auxiliary Power Supply Generator OperationGeneral Information Table B.3 Generator Power Applications To USE the POWER-ARC 4000 for Welding Welding OperationAfter YOU Finish the Weld Material Thickness Electrode Type Size Setting Welding GuidelinesStick Welding ARC Welding CircuitFour Factors of Successful Welding 12/95 POWER-ARCElectrode Correct WAY to Strike AN ARCCorrect Welding Speed Correct ARC LengthTable of Contents Accessories OPTIONS/ACCESSORIES Lincoln Electric AccessoriesBriggs and Stratton Accessories Table of Contents Maintenance Engine Maintenance Routine and Periodic MaintenanceFigure D.2 Clean Rotating SCREEN/FINGER GUARD/DEBRIS Guard Figure D.4 SET Spark Plug GAP Table D.2 Engine Maintenance Parts GENERATOR/WELDER MaintenancePart Part Number Figure D.6. Major Component Locations Table of Contents Theory of Operation Section ENGINE, EXCITATION, Rotor and Stator Theory of OperationFigure E.3 Field Excitation and Auxiliary Power Rotor Field Feedback and Auxiliary PowerWeld Winding and Reactor Auxiliary Power Overcurrent ProtectionTable of Contents Trouble Shooting & Repair Section HOW to USE Troubleshooting Guide Troubleshooting & RepairOutput Problems Troubleshooting GuideOr contact your local Lincoln Local Lincoln Electric Authorized Troubleshooting & Repair Troubleshooting & Repair Engine Problems Engine Problems Welding Problems Rotor Voltage Test Test DescriptionMaterials Needed Ground Stud Lead 200A Connection Output Panel Test ProcedureRotor Resistance Test Rings SlipCable TIE Brushes Figure F.3 Brushes Retained with Cable TIEEngine Throttle Adjustment Test Strobe-tach Method MarkFrequency Counter Method Oscilloscope MethodNUT Figure F.5 Location of Engine Throttle Adjustment NUTScope Settings Normal Open Circuit Weld Voltage WaveformHigh Idle no Load Normal Open Circuit Voltage Waveform 115 VAC Supply Typical Weld Output Waveform Machine LoadedMachine Loaded to 125 Amps AT 23 VAC Description Brush Removal and ReplacementFigure F.6 Brushes Retained with Cable TIE ProcedureProcedure Rheostat Removal and Replacement Figure F.7 Rheostat Removal Capacitor AND/OR Diode Bridge Removal Replacement Procedure Capacitor Removal and Replacement Capacitor AND/OR Diode Bridge Removal and ReplacementProcedure Diode Bridge Removal and Replacement Instructions STATOR/ROTOR Removal and ReplacementTIE Wrap Stator Removal ProcedureOutput TerminalsFigure F.10 Stator END Bracket Support and THRU-BOLTS Thru Bolts Support Nuts POWER-ARCRotor Removal Procedure Reassembly ProcedureRotor THRU-BOLT Rotor Feeler GaugeRetest After Repair Auxiliary Power Receptacle OUTPUT1Engine Output WELDER/GENERATOR OUTPUT1POWER-ARC Table of Contents Electrical DiagramsSection G POWER-ARC Electrical DiagramPOWER-ARC POWER-ARC