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 .........................................................................................................................................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 .............................................................................................................................................14
Clearance between needle and tip of the rotary hook ............................................................................... 15-16
Hook timing ......................................................................................................................................................17
Needle bar height .............................................................................................................................................18
Backlash between hook drive gear and lower shaft gear .................................................................................19
Upper shaft shield plate position ......................................................................................................................20
Upper thread tension .........................................................................................................................................21
Tension release mechanism ...............................................................................................................................22
Needle threader hook position ..........................................................................................................................23
Thread drawinf lever ..........................................................................................................................................24
Upper feed dog ............................................................................................................................................ 25-27
Buttonhole lever .................................................................................................................................................28
Thread cutter ....................................................................................................................................................29
Presser bar lifter position ...................................................................................................................................30
Presser foot lifter stopper position .............................................................................................................. 31-32
Automatic presser foot lifter initializing position ................................................................................................33
Presser bar height ..............................................................................................................................................34
Embroidery foot height ......................................................................................................................................35
Stretch stitch feed balance ...............................................................................................................................36
Knee lifter ...........................................................................................................................................................37
