1
DC4030P
CONTENTS
SERVICE ACCESS (1) FACE COVER .............................................................................2
SERVICE ACCESS (2) BED COVER...............................................................................3
SERVICE ACCESS (3) FRONT COVER..........................................................................4
SERVICE ACCESS (4) REAR COVER ............................................................................5
PRESSER BAR HEIGHT AND ALIGNMENT...................................................................6
NEEDLE DROP POSITION..............................................................................................7
NEEDLE TO HOOK TIMING ............................................................................................8
NEEDLE BAR HEIGHT ....................................................................................................9
NEEDLE CLEARANCE TO SHUTTLE ...........................................................................10
BACKLASH (BETWEEN LOWER SHAFT GEAR AND HOOK DRIVE GEAR)..............11
FEED DOG HEIGHT ......................................................................................................12
ZIGZAG SYNCHRONIZATION .......................................................................................13
NEEDLE THREAD TENSION.........................................................................................14
STRETCH STITCH FEED BALANCE ............................................................................15
REPLACEMENT AND ADJUSTMENT OF THE NEEDLE THREADER PLATE.............16
ADJUSTING BUTTONHOLE LEVER POSITION...........................................................17
CONNECTOR DIAGRAM...............................................................................................18
SELF DIAGNOSTIC TESTS....................................................................................19 - 22
REPLACING PRINTED CIRCUIT BOARD A .................................................................23
REPLACING PRINTED CIRCUIT BOARD F AND SLIDE VOLUME..............................24
REPLACING DC MOTOR AND ADJUSTING MOTOR BELT TENSION ........................25
REPLACING THE FUSES..............................................................................................26
REPLACING MACHINE SOCKET (UNIT)......................................................................27
REPLACING THE TRANSFORMER ..............................................................................28
REPLACING THE ZIGZAG WIDTH MOTOR..................................................................29
REPLACING THE FEED STITCH MOTOR ....................................................................30
ADJUSTING THE BOBBIN WINDER SWITCH..............................................................31