INDEX
Changing 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 electronic components
Printed circuit board A ......................................................................................................................... 7
Printed circuit board F .........................................................................................................................8
Switching power supply unit ................................................................................................................9
DC motor ...........................................................................................................................................10
Thread tension unit ...........................................................................................................................11
Mechanical adjustment
Feed dog height ................................................................................................................................12
Needle drop position .........................................................................................................................13
Presser bar height .............................................................................................................................14
Hook timing .......................................................................................................................................15
Needle bar height ..............................................................................................................................16
Clearance between needle and tip of the rotary hook ................................................................ 17-18
Presser bar lifter switch position adjustment .....................................................................................19
Backlash between hook drive gear and lower shaft gear ..................................................................20
Upper shaft shield plate position .......................................................................................................21
Upper thread tension.........................................................................................................................22
Needle threader plate........................................................................................................................23
Buttonhole lever adjustment ..............................................................................................................24
Thread cutter .....................................................................................................................................25
Solenoid position adjustment ............................................................................................................26
Stretch stitch feed balance ................................................................................................................27
Needle plate switch ..................................................................................................................... 28-29
Diagnosis test
...................................................................................................................................... 30-36
PARTS LIST
.......................................................................................................................................... 37-59