INDEX
CHANGING EXTERNAL PARTS
Face cover ...........................................................................................................................................1
Belt cover ............................................................................................................................................1
Top cover .............................................................................................................................................2
Base plate ...........................................................................................................................................3
Base cover ..........................................................................................................................................3
Bed cover ............................................................................................................................................4
Free arm cover ................................................................................................................................ 4-5
Front cover ..........................................................................................................................................6
Rear cover ...........................................................................................................................................7
REPLACING ELECTRONIC COMPONENTS
Printed circuit board A .........................................................................................................................8
Printed circuit board F .........................................................................................................................9
Printed circuit board B (USB board) ....................................................................................................9
Switching power supply unit ..............................................................................................................10
Driving motor .....................................................................................................................................11
Thread tension unit ...........................................................................................................................12
MECHANICAL ADJUSTMENT
Feed dog height ................................................................................................................................13
Clearance between needle and tip of the rotary hook ................................................................ 14-15
Backlash between hook drive gear and lower shaft gear ..................................................................16
Needle drop position .........................................................................................................................17
Hook timing .......................................................................................................................................18
Needle bar height ..............................................................................................................................19
Upper shaft shield plate position .......................................................................................................20
Upper thread tension.........................................................................................................................21
Tension release mechanism ..............................................................................................................22
Needle threader plate........................................................................................................................23
Thread drawing lever .........................................................................................................................24
Buttonhole lever adjustment ..............................................................................................................25
Presser bar lifter switch position .......................................................................................................26
Embroidery foot height ......................................................................................................................27
Embroidery foot detecting sensor adjustment ...................................................................................28
Presser foot lifter switch adjustment ..................................................................................................29
Knee lifter ..........................................................................................................................................30
Thread cutter .....................................................................................................................................31
Remaining bobbin threader sensor ...................................................................................................32
Needle plate sensor .................................................................................................................... 33-34
Bobbin winder ...................................................................................................................................35
Stretch stitch feed balance ................................................................................................................36
Y-carriage play adjustment ................................................................................................................37
Adjusting X and Y sensors (simple adjustment) ................................................................................38
Cloth guide start position ..................................................................................................................39
