CONTENTS
LOCATE AND IDENTIFY THE PARTS ............................................................................................................... 1
WINDING THE BOBBIN .................................................................................................................................... 2
THREADING THE MACHINE ............................................................................................................................ 3
CONNECTOR DIAGRAM .................................................................................................................................. 4
GENERAL TROUBLE SHOOTING PROCEDURE ............................................................................................ 5
WHAT TO DO WHEN ......................................................................................................................................6-8
SELF-DIAGNOSTIC TESTS .........................................................................................................................9-11
SERVICE ACCESS
FACE COVER ................................................................................................................................... 12
TOP COVER ..................................................................................................................................... 12
BELT COVER.................................................................................................................................... 13
BASE PLATE .................................................................................................................................... 14
BED COVER ..................................................................................................................................... 14
FRONT COVER ................................................................................................................................ 15
REAR COVER .................................................................................................................................. 16
FREE ARM COVER.......................................................................................................................... 17
MECHANICAL ADJUSTMENT
NEEDLE DROP POSITION .............................................................................................................. 18
NEEDLE BAR HEIGHT .................................................................................................................... 19
NEEDLE TO HOOK TIMING ............................................................................................................. 20
CLEARANCE BETWEEN NEEDLE AND HOOK ............................................................................. 21
BACKLASH (BETWEEN LOWER SHAFT GEAR AND HOOK GEAR) ....................................................
22
FEED DOG HEIGHT ........................................................................................................................ 23
ZIGZAG SYNCHRONIZATION ......................................................................................................... 24
TENSION RELEASE MECHANISM ................................................................................................. 25
STRETCH STITCH FEED BALANCE ADJUSTMENT ..................................................................... 26
NEEDLE THREAD TENSION ........................................................................................................... 27
BUTTONHOLE LEVER..................................................................................................................... 28
PRESSER FOOT HEIGHT AND ALIGNMENT ................................................................................ 29
PART REMOVAL AND REPLACEMENT
NEEDLE THREAD TENSION UNIT ................................................................................................. 30
THREADER PLATE .......................................................................................................................... 31
REPLACING THE PRINTED CIRCUIT BOARD “A” .............................................................................................. 32
REPLACING THE PRINTED CIRCUIT BOARD “F” .............................................................................................. 33
REPLACING SLIDE VOLUME .............................................................................................................................. 34
REPLACING DC MOTOR AND ADJUSTING MOTOR BELT TENSION ............................................................... 35
REPLACING THE FUSES .................................................................................................................................... 36
REPLACING MACHINE SOCKET (UNIT) ............................................................................................................ 37
REPLACING TRANSFORMER ............................................................................................................................. 38
REPLACING THE ZIGZAG WIDTH MOTOR ........................................................................................................ 39
REPLACING THE FEED STITCH MOTOR ........................................................................................................... 40
ADJUSTING THE BOBBIN WINDER SWITCH .................................................................................................... 41
OILING .......................................................................................................................................................... 42
................................. 43-61
PARTS LIST
...................................................................................................................
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