2
Stitching off
34. Adjustment of needle threader 64
35. Adjustment of bobbin winder stop 66
36. Adjustment of bobbin thread tension 67
37. Adjustment of needle thread tension 68
38. Adjustment of thread check spring stroke 70
39. Adjustment of equal stitch length for left and right buttonhole seams 72
40. Adjustment of equal forward and reverse stitch length 73
(for forward and reverse controlled utility stitches)
41. Making up a sewing sample 74
Repair Instructions
42. Removing and fitting the needle thread tension 75
43. Changing the pressure spring in the handwheel release 76
44. Removing and fitting the sewing hook 78
45. Cleaning and oiling the machine 78
46. Changing the toothed belt 80
47. Adjusting the arm shaft crank 82
48. Changing the bevel gears 84
49. Changing the motor 88
50. Changing the motor circuit board on motor types UUS 390 and UUS 393 90
51. Changing the carbon brushes on motor types UUS 390 and UUS 393 91
52. Changing the motor pinion 92
53. Changing the motor toothed belt 93
54. Changing the circuit board in foot control AE 010 94
55. Changing the mains connections in foot control AE 010 95
Safety test
56. Electrical safety test 96
57. Electrical safety test with ABB Metrawatt M 5013 96
58. Simulated leakage current measurements of complete motors with ABB Metrawatt M 5013 99
59. Measures required in case of incorrect readings 99
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