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Maintenance
hints
(cont.)
Lower
thread
not
brought
up
by
the
upper
thread
The
needle
is
incorrectly
inserted.
See
page
6.
Uneven
thread
tension
This
may
be
due
to
poor
thread
quality.
Irregular
bobbin
winding
1.
The
bobbin
is
not
pressed
in
far
enough.
See
page
10.
2.
The
machine
is
not
correctly
threaded
for
bobbin
winding.
See
page
8.
3.
The
thread
guide
for
bobbin
winding
is
not
correctly
adjusted.
See
page
9.
Fabric
puckers
I.
The
upper
thread
is
too
tightly
tensioned.
See
page
12.
2.
The
upper
and
lower
thread
tension
is
too
tight
in
relation
to
the
thickness
of
the
fabric.
See
page
12.
3.
The
needle
is
damaged.
Change
the
needle.
Stitch
length
varies
The
feed
dog
is
choked
by
dust
and
dirt.
Clean
it
with
the
special
brush
or
small
screwdriver.
See
page
30.
The
seani
is
too
loose.
Fabric
layers
not
held
together
The
thread
tension
is
too
slack.
See
page
12.
Machine
does
not
feed
the
fribric
1.
The
stitch
length
dial
is
set
on
0.
2.
The
feed
dog
is
lowered.
Raise
it
by
pressing
the
symbol
:H
on
the
drop
feed
button.
See
page
15.
Machine
runs
sluggishly
I.
Dirt
or
lint
has
got
under
the
throat
plate.
Loosen
the
throat
plate
and
brush
clean
between
the
teeth
of
the
feed
dog.
See
page
30.
2.
Dirt
or
lint
has
got
into
the
shuttle.
Take
out
the
bobbin
and
bobbin
case
and
brush
clean
with
special
brush.
See
page
30.
3.
The
wall
outlet
voltage
is
too
low.
32
34


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