Valley FABRICATOR 251 Service Manual - page 6

TABLE OF CONTENTS

SECTION 8:

CIRCUIT OPERATION ................................................................................ 8-1

8.01 Circuit Operation Of The Control PCB 7977964 .............................................. 8-1

8.02 Circuit Operation Of The MIG Timer PCB 7977965 ......................................... 8-2

8.03 Circuit Operation Of The Digital Volt/Amp PCB 704883 .................................. 8-2

8.04 Circuit Operation Of The Spool Gun PCB 7978034 ......................................... 8-3

SECTION 9:

PARTS LIST .......................................................................................... 9-1

9.01 Equipment Identification ................................................................................. 9-1

9.02 How To Use This Parts List ............................................................................ 9-1

9.03 External Replacement Parts ............................................................................ 9-2

9.04 Internal Replacement Parts (1) ...................................................................... 9-4

9.05 Major Electrical and Mechanical Replacement Parts ...................................... 9-6

9.06 Internal Replacement Parts (2) ...................................................................... 9-7

9.07 Internal Replacement Parts-Spool Assembly ................................................. 9-8

9.08 Internal Replacement Parts-Wire Feeder ........................................................ 9-9

9.09 Wire Feeder Replacement Parts ................................................................... 9-10

APPENDIX 1: FEEDROLL KITS ........................................................................... A-1

APPENDIX 2: POWER SUPPLY CIRCUIT DIAGRAM ................................................... A-2

APPENDIX 3: MAIN PCB CIRCUIT DIAGRAM ........................................................... A-4

APPENDIX 4:  SPOT TIMER CIRCUIT DIAGRAM ....................................................... A-6

APPENDIX 5:  SPOOL GUN PCB .......................................................................... A-8

LIMITED WARRANTY

WARRANTY SCHEDULE

GLOBAL CUSTOMER SERVICE CONTACT INFORMATION .......................... Inside Rear Cover