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18. Adjustment of the needle thread tension
Requirement:
Within the adjusting range from 3 to 5, the interlacing of the needle thread and the bobbin thread
(using cotton thread) must take place approximately in the middle of the fabric at straight
and zigzag stitch setting.
Check:
● Set the needle thread tension to “5”. Sew with straight and zigzag stitches with stitch length at “2”.
Adjustment:
● Fold up the carrying handle.
● Turn out both arm cover retaining screws and remove arm cover.
● Loosen both face cover retaining screws and remove face cover.
● Turn out Phillips screw 56 (fig. 18).
● Turn out screw 57.
● Take out leaf spring 58 and connecting strap 59.
● Refit leaf spring 58 with screw 57.
● Pull out nut retention 60 and remove graduated knob 61.
● Turn gear 62 slightly to the left.
● Set control knob to the widest zigzag stitch setting.
● Sew while turning the gear 62 in small increments to the right, until the interlacing is in the middle
of the fabric.
● Slide on the graduated knob 61 so that the number “5” is aligned with the mark.
● Fit retention 60 in the groove of the tension bolt 63.
● Turn out screw 57 and take out leaf spring 58.
● Fit connecting strap 59 onto the tension bolt 63 and tighten Phillips screw 56 slightly.
● Tighten Phillips screw 56 securely.
Test:
● Re-fit face cover and arm cover.
● Set the graduated knob to “5”.
● Sew and check the interlacing.
● Fasten leaf spring 58 with screw 57.
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