Baby Lock Diana (BL480A) Instruction and Reference Guide - Manual (Page 31)

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The presser foot pressure of this machine is pre-adjusted at the
factory to suit the sewing of medium weight fabrics.
Most of the materials do not require adjustment of presser foot
pressure. However, there are some instances where adjustment
is necessary, such as when sewing lightweight and heavyweight
fabrics.
In such case, N for normal, 1 for the less pressure, and 5 for more
perssure.
For lightweight fabric...Increase the pressure by turning the dial
toward the 5.
For heavyweight fabric...Decrease the pressure by turning the dial
toward the 1.
17. HOW TO ADJUST THE PRESSER FOOT
PRESSURE
5
4
1
N
2
The stitch length dial should be set on the N setting for most
sewing conditions.
Adjust the stitch length to N~ 4 when sewing heavy weight fabrics.
Adjust the stitch length to 2~N when sewing lightweight fabrics to
obtain excellent seams without puckering.
3
N
2
16. HOW TO ADJUST THE STITCH LENGTH
4