Brother SL100 Service Manual page 142

Adjustment
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Adjustment of the stitch length of "b" (left reverse stitch)
9. Adjust the stitch length of the left reverse stitch by turning the BH adjusting dial on the front side of the machine.
*Key point
• The number of left reverse stitches should be 35 to 50 per 20 mm.
And stitch difference should be within ±10.
*Key point
• Turn the BH adjusting dial to the direction "A".
→ Left reverse stitch length is longer. (The number of stitches decreases) (Fig. 2 "A")
• Turn the BH adjusting dial to the direction "B".
→ Left reverse stitch length is shorter. (The number of stitches increases) (Fig. 2 "B")
BH adjusting dial
Left and right stitch of buttonhole stitch length
A
4 - 24
B
NG
OK
b
A
b
NG
B
b
b = 35 - 50 stitches
and
The stitch difference of
"b" and "d" is within ±10 stitches.
Fig. 2
20 mm
d