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Prob'em
Cause
So'ution
Machine does not
Power supply interrupted
Close looper cover 10 or
run although mas-
looper cover 1 0 or
work support 1 2 (see p. 7(
ter switch is on
work support 1 2 (see p. 7(
Fabric not neatly
Sewing lint between upper
Clean knives (see p. 32)
trimmed
and lower knife
Upper knife blunt
Exchange upper knife
(see p. 30)
Puckered seams
Thread tension too tight
Reduce thread tension
(especially for light materials)
(pp. 15—16)
Incorrect setting of
Re-adjust differential feed
differential feed
Thread has caught due to
Thread correctly (pp. 7—11)
incorrect threading
Puckered seams
Inadequate sewing foot
Insert sewing foot adequate
used for seam width sewn
for the seam width (see top
of p. 35>
Edge thread
Inadequate sewing foot
insert sewing foot adequate
too loose
used for seam width sewn
for the seam width (see top
of p. 35)
41
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