TABLE OF CONTENTS
Replacing external parts
Face cover ......................................................................................................................................................... 1
Belt cover ........................................................................................................................................................... 1
Top cover ........................................................................................................................................................... 2
Machine base .................................................................................................................................................... 3
Base cover ......................................................................................................................................................... 3
Bed cover .......................................................................................................................................................... 3
Free arm cover ................................................................................................................................................... 4
Front cover ......................................................................................................................................................... 5
Rear cover .......................................................................................................................................................... 6
Replacing mechanical parts
Needle threader hook position .......................................................................................................................... 7
Replacing electronic components
Printed circuit board A ....................................................................................................................................... 8
Printed circuit board F ....................................................................................................................................... 9
Speed control slider ........................................................................................................................................... 9
Switching power supply unit ............................................................................................................................ 10
DC motor ......................................................................................................................................................... 11
Thread tension unit .......................................................................................................................................... 12
Mechanical adjustment
Feed dog height ............................................................................................................................................... 13
Needle drop position ....................................................................................................................................... 14
Presser bar height ............................................................................................................................................ 15
Hook timing ..................................................................................................................................................... 16
Needle bar height ............................................................................................................................................ 17
Clearance between needle and tip of the rotary hook ................................................................................ 18-19
Presser bar lifter switch position adjustment ................................................................................................... 20
Backlash between hook drive gear and lower shaft gear ................................................................................ 21
Upper shaft shield plate position ..................................................................................................................... 22
Upper thread tension ........................................................................................................................................ 23
Buttonhole lever adjustment ............................................................................................................................ 24
Thread cutter ................................................................................................................................................... 25
Solenoid position adjustment .......................................................................................................................... 26
Upper feed dog ........................................................................................................................................... 27-29
Stretch stitch feed balance .............................................................................................................................. 30
Needle plate switch ................................................................................................................................... 31-32
Knee lifter posotion .......................................................................................................................................... 33
Diagnosis test ............................................................................................................................................ 34-39
PARTS LIST ...................................................................................................................................................... 40-61
