INDEX
Changing External Parts
Face cover .................................................................................................................................................................1
Belt cover ..................................................................................................................................................................1
Top cover ...................................................................................................................................................................2
Base plate ..................................................................................................................................................................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
Communication module ......................................................................................................................................... 8-9
Printed circuit board U1 ...........................................................................................................................................10
Printed circuit board U2 ...........................................................................................................................................11
Printed circuit board K .............................................................................................................................................12
Printed circuit board F .............................................................................................................................................13
Switching power supply unit ....................................................................................................................................14
USB unit ..................................................................................................................................................................15
Driving motor ...........................................................................................................................................................16
Thread tension unit ..................................................................................................................................................17
Mechanical Adjustment
Feed dog height .......................................................................................................................................................18
Needle drop position ................................................................................................................................................19
Hook Timing.............................................................................................................................................................20
Needle bar height ....................................................................................................................................................21
Clearance between needle and tip of rotary hook ............................................................................................. 22-23
Backlash between hook drive gear and lower shaft gear ........................................................................................24
Upper shield plate position ......................................................................................................................................25
Upper thread tension ...............................................................................................................................................26
Tension release mechanism ....................................................................................................................................27
Needle threader holder (threader hook replacement) .............................................................................................28
Needle threader hook position adjustment ..............................................................................................................29
Needle thread motor replacement ...........................................................................................................................30
Thread drawing lever ...............................................................................................................................................31
Upper feed dog .................................................................................................................................................. 32-37
Buttonhole lever adjustment ....................................................................................................................................38
Thread cutter ...........................................................................................................................................................39
Presser bar lifter position .........................................................................................................................................40
Presser foot lifter stopper position ..................................................................................................................... 41-43
Automatic presser foot lifter initializing sensor position ...........................................................................................44
Presser bar height ...................................................................................................................................................45
Embroidery foot height ............................................................................................................................................46
Presser foot lifter switch ...........................................................................................................................................47
Stretch stitch balance ..............................................................................................................................................48
Knee lifter ................................................................................................................................................................49
Remaining bobbin thread sensor .............................................................................................................................50
Needle plate sensor ........................................................................................................................................... 51-52
Y-carriage play adjustment ......................................................................................................................................53
Cloth guide start position .........................................................................................................................................54
Parts List .......................................................................................................................................................... 55-85