CONTENTS
WHAT TO DO WHEN ......................................................................................................... 1 - 2
SERVICE ACCESS (1) FACE COVER, TOP COVER............................................................ 3
SERVICE ACCESS (2) BASE, BED COVER ......................................................................... 4
SERVICE ACCESS (3) FREE ARM COVER .......................................................................... 5
SERVICE ACCESS (4) BELT COVER ................................................................................... 6
SERVICE ACCESS (5) FRONT COVER ................................................................................ 7
SERVICE ACCESS (6) REAR COVER .................................................................................. 8
PRESSER BAR HEIGHT AND ALIGNMENT .......................................................................... 9
NEEDLE DROP POSITION ................................................................................................... 10
NEEDLE BAR HEIGHT .......................................................................................................... 11
NEEDLE TO HOOK TIMING.................................................................................................. 12
NEEDLE CLEARANCE TO HOOK ........................................................................................ 13
BACKLASH (BETWEEN LOWER SHAFT GEAR AND HOOK GEAR) ................................. 14
FEED DOG HEIGHT .............................................................................................................. 15
ZIGZAG SYNCHRONIZATION .............................................................................................. 16
TENSION RELEASE MECHANISM....................................................................................... 17
NEEDLE THREAD TENSION ................................................................................................ 18
STRETCH STITCH FEED BALANCE .................................................................................... 19
REPLACEMENT AND ADJUSTMENT OF THE NEEDLE THREADER PLATE .................... 20
CONNECTOR DIAGRAM ...................................................................................................... 21
SELF DIAGNOSTIC TESTS .................................................................................................. 22
SELF DIAGNOSTIC SHEET ........................................................................................... 23 - 26
REPLACING PRINTED CIRCUIT BOARD “A” ...................................................................... 27
REPLACING SLIDE VOLUME AND PRINTED CIRCUIT BOARD “F” .................................. 28
REPLACING DC MOTOR AND ADJUSTING MOTOR BELT TENSION .............................. 29
REPLACING THE FUSES ..................................................................................................... 30
REPLACING THE MACHINE SOCKET ................................................................................. 31
REPLACING THE TRANSFORMER ..................................................................................... 32
REPLACING THE ZIGZAG WIDTH MOTOR......................................................................... 33
REPLACING THE FEED MOTOR ......................................................................................... 34
ADJUSTING BUTTONHOLE LEVER POSITION .................................................................. 35
ADJUSTING THE BOBBIN WINDER SWITCH ..................................................................... 36
OILING ................................................................................................................................... 37
PARTS LIST.................................................................................................................... 38 - 55
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