Contents
WHAT TO DO WHEN
........................................................................................................................ 1 - 3
CHANGING EXTERNAL PARTS
FACE COVER .........................................................................................................................................4
FREE ARM COVER ................................................................................................................................5
FRONT COVER ......................................................................................................................................6
REAR COVER .........................................................................................................................................7
MECHANICAL ADJUSTMENT
PRESSER BAR HEIGHT ........................................................................................................................8
NEEDLE DROP POSITION .....................................................................................................................9
ADJUSTMENT OF HOOK TIMING .......................................................................................................10
ADJUSTMENT OF NEEDLE BAR HEIGHT ..........................................................................................11
CLEARANCE BETWEEN NEEDLE AND TIP OF THE ROTARY HOOK ..............................................12
FEED DOG HEIGHT .............................................................................................................................13
BACKLASH BETWEEN HOOK GEAR AND LOWER SHAFT GEAR ...................................................14
TOP TENSION ......................................................................................................................................15
STRETCH STITCH FEED BALANCE ...................................................................................................16
REPLACEMENT AND ADJUSTMENT OF THE NEEDLE THREAD PLATE .........................................17
SELF-DIAGNOSTIC TEST
SELF-DIAGNOSTIC TEST .............................................................................................................. 18-22
TO DISPLAY THE VERSION OF THE PROGRAM ...............................................................................22
REPLACING THE ELECTRONIC COMPONENTS
PRINTED CIRCUIT BOARD A CONNECTION .....................................................................................23
PRINTED CIRCUIT BOARD A ..............................................................................................................24
PRINTED CIRCUIT BOARD L...............................................................................................................25
DRIVING MOTOR (DC MOTOR) ..........................................................................................................36
SWITCHING REGULATOR UNIT ..........................................................................................................27
PARTS LIST
.................................................................................................................................... 28-41
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