3
Page
Contents 3
Foreword 5
Notes on the sewing machine 6
Specifications 7
Dismantling the housing 10
Feeding System
1. Adjustment of the flat-toothed belt tension 17
2. Adjustment of feed dog in sideways direction 18
3. Timing of feed motion 20
4. Adjustment of feed dog height 22
5. Adjustment of synchronizer 24
6. Adjustment of presser foot height 26
7. Adjustment of top feed foot in sewing direction 27
8. Adjustment of top feed height 28
9. Adjustment of the height of the free motion foot 30
Zigzag mechanism
10. Adjustment of needle in needle hole 32
Stitch forming parts (Hook)
11. Position of needle in needle hole in sewing direction 35
12. Adjustment of hook-to-needle clearance 38
13. Adjustment of bevel gears 39
14. Sewing hook timing 40
15. Adjustment of needle bar height 42
16. Adjustment the bobbin case position finger 43
Stitching off
17. Adjustment of needle threader 44
18. Adjustment of bobbin winder stop 46
19. Adjustment of bobbin thread tension 47
20. Adjustment of needle thread tension 48
21. Adjustment of thread check spring stroke 50
22. Adjustment of equal forward and reverse stitch length 52
23. Making up a sewing sample 54
Repair Instructions
24. Dismantling and assembling the needle thread tension 55
25. Changing the torsion spring in handwheel 56
26. Dismantling and assembling sewing hook 58
27. Cleaning and oiling the machine 58
28. Changing the flat-toothed belt 60
29. Changing the bevel gears 66
30. Changing the base circuit board 70
31. Changing the upper circuit board 72
32. Changing the keypad 74
33. Changing the synchronizer circuit board 76
34. Changing the motor 78
35. Changing the cable in the foot control 80
36. Changing the upper stepping motor 82
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