INDEX
Changing External Parts
Face cover ...........................................................................................................................................1
Top cover .............................................................................................................................................1
Belt cover ............................................................................................................................................2
Machine base ......................................................................................................................................3
Base cover ..........................................................................................................................................3
Bed cover ............................................................................................................................................3
Free arm cover ................................................................................................................................ 4-5
Front cover ...................................................................................................................................... 6-7
Rear cover ....................................................................................................................................... 8-9
Replacing Electronic Components
Printed circuit board A ................................................................................................................. 10-11
Printed circuit board F .......................................................................................................................12
Switching power supply unit ..............................................................................................................13
Driving motor .....................................................................................................................................14
Thread tension unit ...........................................................................................................................15
Mechanical Adjustment
Feed dog height ................................................................................................................................16
Needle drop position .........................................................................................................................17
Clearance between needle and tip of the rotary hook ................................................................ 18-19
Hook timing .......................................................................................................................................20
Needle bar height ..............................................................................................................................21
Backlash between hook drive gear and lower shaft gear ..................................................................22
Upper shaft shield plate position .......................................................................................................23
Upper thread tension.........................................................................................................................24
Tension release mechanism ..............................................................................................................25
Replacing Needle threader hook.......................................................................................................26
Needle threader hook position ..........................................................................................................27
Thread drawing lever .........................................................................................................................28
Upper feed dog (1) ............................................................................................................................29
Upper feed dog (2) ............................................................................................................................30
Upper feed dog (3) ............................................................................................................................31
Buttonhole lever ................................................................................................................................32
Thread cutter .....................................................................................................................................33
Presser bar lifter position ..................................................................................................................34
Presser foot lifter stopper position (1) ...............................................................................................35
Presser foot lifter stopper position (2) ...............................................................................................36
Automatic presser foot lifter initializing position .................................................................................37
Presser bar height .............................................................................................................................38
Stretch stitch feed balance ................................................................................................................39
Needle plate switch ...........................................................................................................................40
Knee lifter ..........................................................................................................................................41
