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Improper
upper
threading.
See
Page
9-10-15
Not
using
a
ball
point
needle
for
elastic
and
thin
fabric.
Improper
tension.
Sewing
foot
not
suitable
for
the
work.
Stitches
not
Upper
thread
tension
too
loose.
See
Page
10
locked
Improper
tension
of
lower
thread.
Improper
needle
for
thread.
Wrinkled
Upper
or
lower
thread
tension
too
-
See
Paqe
i
fabrics
tight.
Improper
threading
of
upper
or lower
thread
-
Needle
too
thick
for
fabric.
Stitch
length
too
long
for
fabric.
Fabric
not
Lint
jamming
on
feed
dog.
See
Page
59
moving
Feed
dog
is
lowered.
Stitches
too
close.
Pressure
regulator
too
light.
Breaking
Improper
needle
setting
needle
Needle
bent.
Needle
clamp
screw
too
loose.
Upper
thread
tension
too
tight.
Needle
too
thin
for fabric
or/and
thread.
Changing
pattern
or
width
of
stitch
Bring
needle
to
high
test
when
needle
is
down
in
fabric,
position.
Setting
stitch
width
more
than
3.5
when
sewing
with
twin
needle.
Presser
foot
attached
improperly.
Light
going
Not
plugged
in
properly.
See
Page
7
out
Power
supply
switch
is
not
on.
Light
bulb
burnt
out.
—63--