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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
