INDEX
What to do when................................................................................................................................ 1 - 3
Changing External Parts
Face Cover ..............................................................................................................................................4
Free-arm Cover ......................................................................................................................................5
Front Cover........................................................................................................................................ 6 - 7
Rear Cover ..............................................................................................................................................8
Mechanical Adjustment
Presser Bar Height ..................................................................................................................................9
Needle Drop Position.............................................................................................................................10
Adjustment of Hook Timing....................................................................................................................11
Replacing Hook .....................................................................................................................................12
Adjustment of Needle Bar Height ..........................................................................................................13
Clearance between Needle and Tip of Hook Rotary .............................................................................14
Feed Dog Height ...................................................................................................................................15
Top Tension ...........................................................................................................................................16
Replacing the Electronic Components
Circuit Board-A Connection ...................................................................................................................17
Self-diagnostic Test ......................................................................................................................... 18-22
Circuit Board-A ................................................................................................................................ 23-24
Driving Motor .........................................................................................................................................25
Switching Regulator Unit .......................................................................................................................26
Adjusting Buttonhole Lever Position ......................................................................................................27
Parts List ....................................................................................................................................... 28-41
