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Lower lhread not brought up by the
upper thread
Needle
incorrectly
inserted.
See
page
8.
Uneven thread
tension
This
may
be
due
to poor
thread
quality.
I
rregular
bobbin
winding
1.
The bobbin
is
not
pressed
in far
enough.
See
page
11.
2.
The
machine is
not correctly
threaded
for
bobbin
winding.
See
page
9.
3. The
thread guide
for
bobbin winding is
not
cor-
rectly
adjusted.
See
page
10.
Fobric
puckers
t.
The
upper thread
is
too tightly
tensioned.
Correct
upper thread
tension
is illustrated on
page
15.
Upper and lower thread
tension
too tight
in
re-
lation to the
thickness
of
the
fabric.
See
page
15.
Stitch
lenglh v\ries
l.
The
feed
dog is clroked by dust and
dirt.
Clean
it
with the
special
brush
or
small
screwdriver.
See
page 4l
.
2.
The
prcsser
foot
pressure
is
released.
See
page
18.
3. Not
enough
presser
foot
pressure.
Page
18.
The
seam
is
too
loose,
Fabric
layers
not
held logether
The thread tension is too slack. The adjustment of
the thread
tension
is illustrated on
pages
14-15.
Mechina
does
not
leed the
labric
1.
The
stitch
length
dial
is
set
on
0.
2.
The
feed
dog
might
be lowered. Raise
it
by
press-
ing the
feed dog lowering button upward.
See
page
18.
3.
Presser
foot
pressure
might
be
releaseci.
See
page
18.
Machine
does
not
seL,
the
stitch
indicated
Seam
former incorrectly
inserted.
Directions on
page 20.
Macltine
runs sluggishly
l.
Dirt or Iint
have
got
under the throat
plate.
Loosen
tlre throat plate and
brush clean
between
the teeth
of
the
feed dog.
2.
Dirt or lint
have got
into the
shuttle. Take
out
the
bobbin and bobbin
case
and brush clean
with
special brush.
3. Wall
outlet
voltage
might
be
too low.
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