SINGER W1640 - Manual (Page 33)

PROBLEMS - and PROBABLE CAUSES Section 9
Problem Probable Cause
Correction
If Machine
Binds
Thread or lint in
raceway
See instruction, page 28.
Skipping Bent needle Discard and replace.
Stitches
Needle placed in­
correctly in clamp
See instruction page 8.
Too fine a needle
for thread being used
See needle and thread chart,
page 7
Irregular
Stitches
Upper thread tension
too loose
Tighten upper tension.
Improper threading
See threading instruction,
page 12.
Bobbin not wound
evenly
Rewind bobbin, page 10
Uneven Stitches Pulling or holding
material
Avoid pulling or holding
material, just guide it.
Not enough tension
on upper thread
Increase tension.
Poor quality thread
Try different thread.
Needle too fine for
thread being used
See needle and thread chart,
page 7.
Upper Thread
Breaking Improperly threaded
Refer to threading instructions.
See page 12.
Too much tension
Loosen tension on upper thread
by turning thread tension dial
to lower number.
Starting with take-up
in incorrect position
Always start sewing with take-
up lever in highest position.
Improper setting of
needle
Refer to needle setting in­
struction. See page 8.
Bent needle or eye of
needle too sharp
Insert new needle.
Bent or blunt needle Insert new needle.
Material
Puckering Tensions too tight
See tension adjustment
page 15 and 16.
Dull needle
Insert new needle.
Stitch length too long Reduce stitch length.
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