Lincoln Electric SVM 113-A service manual Figure F.18 Field Diode Bridge Location

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F-44

F-44

TROUBLESHOOTING & REPAIR

FIELD DIODE BRIDGE REMOVAL AND REPLACEMENT (continued)

FIGURE F.18 - FIELD DIODE BRIDGE LOCATION

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7A (Blue)

201(Black) 201C (Black)

–

200(Red)

200C (Red)

+

	9A (Brown)	Field Diode Bridge
	9B (Brown)	Field Diode Bridge
	9B (Brown)

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5.The field diode bridge is mounted to the sheet metal just above the capacitor. See Figure F.18. Remove it using the slot head screw driver and the 11/32” wrench.

6.With the needle nose pliers, gently remove the 7 wires from the diode bridge.

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

Lead 200 and 200C are piggy-backed 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 (Black) are piggy- backed on the negative (–) terminal, which will always be located diagonally across from the positive (+) terminal.

The Blue lead (7A) is attached to one AC ter- minal. Leads 9A and 9B are piggy-backed to the other AC terminal.

8.Mount the field diode bridge using the screw, washers and nut. Use the slot head screwdriver and 11/32” wrench.

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

10.Replace the control panel and tighten the 6 sheet metal screws with the 5/16” nut driver and 5/16” wrench.

11.Replace the top cover of the control box and tighten the 8 sheet metal screws with the 5/16” nut driver.

WELDANPOWER 125

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Contents Weldanpowertm Safety California Proposition 65 WarningsElectric Shock can kill Cylinder may explode if damaged Précautions DE Sûreté Master Table of Contents for ALL Sections Table of Contents Installation Section Installation Technical Specifications WeldanpowerLocation and Ventilation Safety PrecautionsStoring PRE-OPERATION Engine Service Electrical Output Connections Welding Cable ConnectionsMachine Grounding Auxiliary Power ReceptaclesPlugs and HAND-HELD Equipment Premises Wiring Circuit BreakersThese Devices Without Table of Contents Operation Section Operating Instructions Safety InstructionsOperation General DescriptionRecommended Applications Operational Features and ControlsDesign Features Advantages Welding CapabilityControls and Settings WELDER/GENERATOR ControlsGasoline Engine Controls Figure B.2 Gasoline Engine ControlsBefore Starting the Engine Engine OperationStarting the Engine Stopping the Engine For Best Engine StartingGeneral Information Welding OperationBREAK-IN Period LOW OIL SensingTo USE the Weldanpower 125 for WELD- ING TIG WeldingTable B.2 Electrode Selection Guide Auxiliary Power To USE the Weldanpower 125 AS AN Auxiliary Power SupplyTable B.3 Generator Power Applications Table of Contents Accessories Lincoln Electric Accessories OPTIONS/ACCESSORIESBriggs and Stratton Accessories Table of Contents Maintenance Routine and Periodic Maintenance Engine MaintenanceFigure D.3 Clean Finger Guard MaintanenceFigure D.5 SET Spark Plug GAP WELDER/GENERATOR Maintenance Table D.2 Engine Maintenance PartsFigure D.6 Major Component Locations Table of Contents Theory of Operation Section ENGINE, EXCITATION, Rotor and Stator Idler BoardRotor Field Feedback Auxiliary Power Engine Idle Control Auxiliary Power Overcurrent ProtectionWeld WINDING, Output Rectifier and Choke Figure E.4 Weld WINDING, Output Rectifier and ChokeTable of Contents Trouble Shooting & Repair Section Troubleshooting & Repair HOW to USE Troubleshooting GuidePC Board Troubleshooting Procedures Electric Shock can killTroubleshooting Guide Output ProblemsOutput Rectifier Troubleshooting & Repair Perform the Engine Throttle Engine Problems Main Stator Winding Test Engine Throttle Adjustment Troubleshooting & Repair Weldanpower Test Description Rotor Voltage TestMaterials Needed Test Procedure Rotor Voltage TestRotor Resistance Test Rotor Resistance Test Figure F.3 Brushes Retained with Cable TIE Output Rectifier Bridge Test Output Rectifier Bridge Test Main Stator Test Main Stator Test Figure F.6 Main Stator Molex Plug Test Points Rotor Flashing Circuit Test Rotor Flashing Circuit Test WP125 Idler Engine Throttle Adjustment Test Test Procedure Figure F.12 Idle Speed Adjustment Screw Locations Figure F.13 LOW Idle Adjustment NUT on Idler Solenoid TOC Normal Open Circuit Weld Voltage Waveform Scope SettingsHigh Idle no Load Output Control AT Maximum Normal Open Circuit Voltage Waveform 115 VAC Supply Machine Loaded Typical Weld Output WaveformMachine Loaded to 125 Amps AT 25 VAC Abnormal Open Circuit Weld Voltage Waveform Brush Removal and Replacement DescriptionProcedure Figure F.14 Brushes Retained with Cable TIEProcedure Rheostat Removal and Replacement Rheostat Removal and Replacement Field Capacitor Removal and Replacement Field Capacitor Removal and Replacement Field Diode Bridge Removal and Replacement Field Diode Bridge Removal and Replacement Figure F.18 Field Diode Bridge Location Idler Printed Circuit Board Removal Replacement Carefully remove the board Output Rectifier Bridge Removal Replacement Output Rectifier Bridge Removal and Replacement Troubleshooting & Repair Output Choke Removal and Replacement Output Choke Removal and Replacement Section TOC STATOR/ROTOR Removal and Replacement InstructionsStator Removal Procedure Troubleshooting & Repair Rotor Removal Procedure Reassembly ProcedureFigure F.24 Checking ROTOR-STATOR AIR GAP Feeler Gauge Troubleshooting & Repair Engine Output Auxiliary Power Receptacle OUTPUT1Retest After Repair WELDER/GENERATOR OUTPUT1Weldanpower Table of Contents Diagrams Section Wiring Diagram Code 10158 Schematic DiagramsIdler PC Board M17578 Dimension Print Weldanpower Weldanpower M17578 Idler PC Board M17578-1M17578 Idler PC Board Bill of Materials DescriptionWeldanpower