
POWER MIG™300SERVICE MANUALSafety Depends on YouLincoln arc welding and cuttingequipment is designed and builtwith safety in mind. However, youroveral
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TROUBLESHOOTING & REPAIRF-56 F-56POWER MIG 300Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOCReturn to Mas
RETEST AFTER REPAIRRetest a machine:• If it is rejected under test for any reason that requires you to remove any part which could affect the machine
G-1ELECTRICAL DIAGRAMSG-1TABLE OF CONTENTS -ELECTRICAL DIAGRAMS SECTION-ELECTRICAL DIAGRAMS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ELECTRICAL DIAGRAMSG-2POWER MIG 300WIRING DIAGRAM - POWER MIG 300 CODE 10562 ONLYALL CASE FRONT COMPONENTS SHOWN VIEWED FROM REAR.PANEL RECEPTACLE CAV
ELECTRICAL DIAGRAMSG-3POWER MIG 300WIRING DIAGRAM - POWER MIG 300 CODE 10952 ONLYALL CASE FRONT COMPONENTS SHOWN VIEWED FROM REAR.PANEL RECEPTACLE CAV
ELECTRICAL DIAGRAMSG-4POWER MIG 300WIRING DIAGRAM - POWER MIG 300 CODE 10958 AND 11000 ONLYALL CASE FRONT COMPONENTS SHOWN VIEWED FROM REAR.PANEL RECE
ELECTRICAL DIAGRAMSG-5POWER MIG 300WIRING DIAGRAM - POWER MIG 300 CODE 11097 AND 11098 ONLYJ4123456789101112J312345678910J712345678910111213141516J912
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A-5GUN AND CABLE INSTALLATIONA Magnum 300 gun and 15Ft.(4.6m) cable(12Ft.(3.7m) for Codes 11000 and below) are provid-ed with the POWER MIG 300. A Mag
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ELECTRICAL DIAGRAMSG-11POWER MIG 300SCHEMATIC - DIGITAL CONTROL PC BOARD #4 - CODE 10562 - 11098G-11NOTE: This diagram is for reference only. It may n
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ELECTRICAL DIAGRAMSG-13POWER MIG 300SCHEMATIC - CHOPPER BOARD - CODE 10562 - 11098G-13NOTE: This diagram is for reference only. It may not be accurate
ELECTRICAL DIAGRAMSG-14POWER MIG 300SCHEMATIC - MSP3 PC BOARD - CODE 10562 - 11098G-14NOTE: This diagram is for reference only. It may not be accurate
NOTE: Lincoln Electric assumes no responsibility for liablilities resulting from board level troubleshooting. PC Board repairs will invalidate your fa
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POWER MIG 300Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOCReturn to Master TOC Return to Master TOC Return t
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ELECTRICAL DIAGRAMSG-20POWER MIG 300SCHEMATIC - ENCODER PC BOARD - CODE 10562 ONLYG-20NOTE: This diagram is for reference only. It may not be accurate
NOTE: Lincoln Electric assumes no responsibility for liablilities resulting from board level troubleshooting. PC Board repairs will invalidate your fa
ELECTRICAL DIAGRAMSG-22POWER MIG 300SCHEMATIC - DISPLAY PC BOARD - CODE 10562 - 11098G-22NOTE: This diagram is for reference only. It may not be accur
NOTE: Lincoln Electric assumes no responsibility for liablilities resulting from board level troubleshooting. PC Board repairs will invalidate your fa
SVM ERROR REPORTING FORMWe need to know if there are errors in our manuals. We also value any suggestions as toadditional tests or procedures that wo
POWER MIG 300SVM160-B
POWER MIG 300Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOCB-1 B-1TABLE OF CONTENTS- OPERATION SECTION -Operation
POWER MIG 300Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOCReturn to Master TOC Return to Master TOC Return t
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POWER MIG 300Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOCReturn to Master TOC Return to Master TOC Return t
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Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOCFOR ENGINEpowered equipment.1.a. Turn the engine off before trouble
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POWER MIG 300Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOCReturn to Master TOC Return to Master TOC Return t
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B-14 NOTESPOWER MIG 300B-14Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOCReturn to Master TOC Return to Maste
POWER MIG 300C-1 C-1TABLE OF CONTENTS- ACCESSORIES -Accessories...
POWER MIG 300C-2 C-2ACCESSORIESDRIVE ROLL KITSRefer to Table C.1 for various drive roll kits that areavailable for the POWER MIG. All items in Bold ar
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Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOCiiSAFETYiiARC RAYS can burn.4.a. Use a shield with the proper filte
C-4 C-4 NOTESPOWER MIG 300Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOCReturn to Master TOC Return to Master
POWER MIG 300D-1 D-1TABLE OF CONTENTS-MAINTENANCE-Maintenance...
POWER MIG 300Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOCReturn to Master TOC Return to Master TOC Return t
D-3 D-3MAINTENANCE5. Seat Liner bushing into back of gun. Secure Linerby tightening set screw. Do not install the gas dif-fuser at this time.6. Lay th
Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOCSection E-1 Section E-1POWER MIG 300Theory of Operation ...
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THEORY OF OPERATIONE-4 E-4POWER MIG 300Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOCReturn to Master TOC Ret
DIODE CONTROL RECTIFIER ANDPOWER BOARDThe Power Board receives approximately 40 VDC fromthe Diode Control Rectifier. In turn, the Power Boardsupplies
WELD CONTROL BOARDThe Weld Control Board performs the primary interfac-ing functions to establish and maintain output control ofthe Power MIG 300 mach
POWER MIG 300Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOCFOR ELECTRICALLYpowered equipment.8.a. Turn off input
E-7 E-7POWER MIG 300Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOCReturn to Master TOC Return to Master TOC R
THERMAL PROTECTIONTwo normally closed (NC) thermostats protect themachine from excessive operating temperatures.These thermostats are wired in series
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PULSE WIDTH MODULATIONThe term PULSE WIDTH MODULATION is used todescribe how much time is devoted to conduction inthe positive and negative portions o
CHOPPER TECHNOLOGYFUNDAMENTALSThe new era of welding machines such as the PowerMIG 300 employ a technology whereby a DC source isturned on and off (ch
Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOCSection F-1 Section F-1POWER MIG 300Troubleshooting & Repair Se
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POWER MIG 300Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOCReturn to Master TOC Return to Master TOC Return t
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POWER MIG 300Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOCivSAFETYivPRÉCAUTIONS DE SÛRETÉPour votre propre prote
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F-8 F-8POWER MIG 300Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOCReturn to Master TOC Return to Master TOC R
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F-11 F-11POWER MIG 300Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOCReturn to Master TOC Return to Master TOC
CHOPPER BOARD CAPACITOR DISCHARGE PROCEDUREService and repair should be performed by only Lincoln Electric factory trained personnel.Unauthorized repa
TROUBLESHOOTING & REPAIRF-13 F-13POWER MIG 300Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOCReturn to Mas
MAIN TRANSFORMER TESTService and repair should be performed by only Lincoln Electric factory trained personnel.Unauthorized repairs performed on this
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6 6MASTER TABLE OF CONTENTS FOR ALL SECTIONSPageSafety...
CHOPPER BOARD TESTService and repair should be performed by only Lincoln Electric factory trained personnel.Unauthorized repairs performed on this equ
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TROUBLESHOOTING & REPAIRF-18 F-18POWER MIG 300Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOCReturn to Mas
CONTROL RECTIFIER TESTService and repair should be performed by only Lincoln Electric factory trained personnel.Unauthorized repairs performed on this
TROUBLESHOOTING & REPAIRF-20 F-20POWER MIG 300Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOCReturn to Mas
OUTPUT RECTIFIER ASSEMBLY TESTService and repair should be performed by only Lincoln Electric factory trained personnel.Unauthorized repairs performed
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WIRE DRIVE MOTOR AND TACHOMETER FEEDBACKTESTService and repair should be performed by only Lincoln Electric factory trained personnel.Unauthorized rep
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A-1 A-1TABLE OF CONTENTS- INSTALLATION SECTION -INSTALLATION...
ENCODER PC BOARD TEST(FOR CODES ABOVE 10562)Service and repair should be performed by only Lincoln Electric factory trained personnel.Unauthorized rep
F-27 F-27POWER MIG 300Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOCReturn to Master TOC Return to Master TOC
TROUBLESHOOTING & REPAIRF-28 F-28POWER MIG 300Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOCReturn to Mas
CURRENT TRANSDUCER TESTService and repair should be performed by only Lincoln Electric factory trained personnel.Unauthorized repairs performed on thi
TROUBLESHOOTING & REPAIRF-30 F-30POWER MIG 300Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOCReturn to Mas
TROUBLESHOOTING & REPAIRF-31 F-31POWER MIG 300Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOCReturn to Mas
POWER MIG 300 SCROLLING DASHES TESTService and repair should be performed by only Lincoln Electric factory trained personnel.Unauthorized repairs perf
TROUBLESHOOTING & REPAIRF-33 F-33POWER MIG 300Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOCReturn to Mas
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MOTOR & GEAR BOX ASSEMBLY REMOVAL ANDREPLACEMENTService and repair should be performed by only Lincoln Electric factory trained personnel.Unauthor
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TROUBLESHOOTING & REPAIRF-38 F-38POWER MIG 300Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOCReturn to Mas
TROUBLESHOOTING & REPAIRF-39 F-39POWER MIG 300Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOCReturn to Mas
OUTPUT RECTIFIER REMOVAL AND REPLACEMENTService and repair should be performed by only Lincoln Electric factory trained personnel.Unauthorized repairs
TROUBLESHOOTING & REPAIRF-41 F-41POWER MIG 300Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOCReturn to Mas
TROUBLESHOOTING & REPAIRF-42 F-42POWER MIG 300Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOCReturn to Mas
CHOPPER BOARD ASSEMBLY REMOVALAND REPLACEMENTService and repair should be performed by only Lincoln Electric factory trained personnel.Unauthorized re
TROUBLESHOOTING & REPAIRF-44 F-44POWER MIG 300Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOCReturn to Mas
TROUBLESHOOTING & REPAIRF-45 F-45POWER MIG 300Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOCReturn to Mas
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TROUBLESHOOTING & REPAIRF-46 F-46POWER MIG 300Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOCReturn to Mas
REMOVAL PROCEDUREELECTRIC SHOCK can kill. High voltage is present when input power is applied tothe machine. NOTE: Cut cable ties as needed to im
TROUBLESHOOTING & REPAIRF-48 F-48POWER MIG 300Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOCReturn to Mas
TROUBLESHOOTING & REPAIRF-49 F-49POWER MIG 300Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOCReturn to Mas
TROUBLESHOOTING & REPAIRF-50 F-50POWER MIG 300Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOCReturn to Mas
TROUBLESHOOTING & REPAIRF-51 F-51POWER MIG 300Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOCReturn to Mas
VOLTAGE & CURRENT CALIBRATION PROCEDUREService and repair should be performed by only Lincoln Electric factory trained personnel.Unauthorized repa
TROUBLESHOOTING & REPAIRF-53 F-53POWER MIG 300Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOCReturn to Mas
TROUBLESHOOTING & REPAIRF-54 F-54POWER MIG 300Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOCReturn to Mas
TROUBLESHOOTING & REPAIRF-55 F-55POWER MIG 300Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOCReturn to Mas
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