Control Board Replacement, Procedure | Lincoln Electric SVM157-A

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F-28

TROUBLESHOOTING AND REPAIR

F-28

CONTROL BOARD REPLACEMENT (continued)

PROCEDURE

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1.Remove power to the machine.

2.Using a 5/16” nutdriver, remove the three screws securing the tool tray.

3.Locate the control board.

4.Disconnect all associated plugs and leads connected to the control board.

5.Depress the retaining pins on the sides of the four nylon mounts to release the control board. See Figure F.8.

6.Carefully remove the control board.

7.Mount the new board to the nylon mounting pins.

8.Reconnect any plugs or leads previously removed.

9.Replace the tool tray previously removed.

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FIGURE F.8. - CONTROL BOARD MOUNTING PINS

DEPRESS

LOCKING TAB ON

MOUNTING PIN

POWER MIG 200

Image 62

Lincoln Electric SVM157-A service manual Control Board Replacement, Procedure

Contents

Power MIG Safety Depends on You Safety California Proposition 65 Warnings Electric Shock can kill ARC Rays can burn Cylinder may explode if damaged Iii Précautions DE Sûreté Sûreté Pour Soudage a L’Arc Master Table of Contents for ALL Sections Table of Contents Installation Section Installation Technical Specifications Power MIG 3INSTALLATIONA-3 Figure A.1 Dual Voltage Machine Input Connections Output Polarity Connections Figure A.2 Triple Voltage Machine Input Connections Cylinder may explode if damaged GUN and Cable InstallationShielding GAS Operation Section Operation Section B Operation Wear eye, ear and body protec- tion Product Description Wire Drive RollWire Size Conversion Parts Recommended Processes and Equipment To Start the Welder Procedure for Changing Drive and Idle Roll SetsWire Reel Loading READI-REELS, Spools or Coils Feeding Wire Electrode Making a Weld Idle Roll Pressure Setting FAN Control Avoiding Wire Feeding ProblemsWire Feed Overload Protection Input Line Voltage Variations Accessories Section K363P READI-REEL Adapter AccessoriesDrive Roll Kits Dual Cylinder Mounting KIT K1702-1 Installed Adapter KIT and Spool GUN Power MIG Maintenance Section Maintenance This screw should only be gently tightened Cause poor wire feedingLiner Removal and REPLACE- Ment Overtightening will split or collapse the liner GUN Handle Disassembly English Metric Description Size Maintenance Power MIG Line Switch Theory of Operation Section Theory of Operation Output Rectification Contactor and Control Board Motor Control Board Control BOARD, GUN Trigger and Wire Drive Motor Figure E.4 Optional Circuits Wirefeed Overload Protection Thermal and Overload Protection Power MIG Troubleshooting and Repair Section Troubleshooting and Repair Section F Troubleshooting and Repair How To Use Troubleshooting Guide PC Board Troubleshooting Procedures Perform the Main Transformer Perform the Output Contactor Your body These capacitors is toxicAvoid contact with any portion Function Problems Tachometer Feedback Test Welding Problems Weld bead is narrow or ropy Make sure the welding proce Materials Needed Main Transformer TestTest Description ON/OFF Power Switch will be hot during these tests Main Transformer Test X10 Table F.1. Test Points Input Voltage Test Points Wire Drive Motor and Tachometer Feedback Test Test Procedure Figure F.4. Plug J4 Disconnect the main AC input power to the machine Test for Supply Voltage to Tachometer Test for Feedback Voltage to Control Board VDC Output Bridge Rectifier Test Test Procedure Output Bridge Rectifier Test Contactor Test Contactor Test Figure F.7. Contactor Terminals and Leads Volts 10.0 Typical Output Voltage Waveform Machine Loaded MAX TAP G Volts 20.0 Normal Open Circuit Voltage Waveform MAX TAP G Machine Loaded to 180 Amps AT 16 VDC Scope Settings Volts 20.0 Control Board Replacement Description Control Board Replacement Procedure Wire Drive Motor Assembly Replacement Wire Drive Motor Assembly Replacement Wire Drive Bolt Gas Hose TOC Output Diode Bridge Rectifier Replacement Output Diode Bridge Rectifier Mounting Bracket Mounting Bolts Rectifier Power MIG Output Capacitors Replacement Output Capacitors Replacement Figure F.14. Capacitor Bank Location Lead Mounting Bolts Nuts & Lock washers Places Power MIG 41TROUBLESHOOTING and REPAIRF-41 Main Transformer Replacement Main Transformer Replacement See Figure F.17 Replacement Figure F.17. Leads X9, X10, 104B,104C, & H1B X2 X3 X4 X5 X6 X7 Lead Power MIG FAN BLADE/MOTOR Replacement FAN BLADE/MOTOR Replacement Perform the Output Capacitor Bank Removal Procedure Output Contactor Replacement Output Contactor Replacement Figure F.24 Mounting Bolts Retest After Repair Electrical Diagrams Table of Contents Electrical Diagrams Section Power MIG 200 208/230V Wiring Diagram Schematic Control PC Board PC Board ASSEMBLY-CONTROL G3851-1 SVM Error Reporting Form