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Faults
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Trouble shooting
ln
most
cases
you
will
be
able
to identify
and remedy
faults
by
checking the
following.
Check
whether:
.
the
upper
and lower threads are
threaded
correctly
.
the
needle
is
inserted correctly
with
the
f
lat
side
to
the
back
' the
needle
size is
correct
-
check
the
needle/thread
table
.
the
machine
is
clean
-
brush
out
any
thread
fluff
the
hook
race
is clean
'
any
threads
are
trapped between
the
tension
discs
or
under
the
bobbin
case
spring
)
Upper
thread
breaks
The
upper
thread tension
is
too
tight.
The
needles
are
of
a poor
quality. ldeally
needles
should
be
purchased
from
your
BERNINA
dealer.
The
needle
has
been rnserted
incorrectly.
The
f
lat
side
of
the
shank must
be
to the
back.
The
needle
is
bent or blunt.
Poor
quality, knotted
or
dried
out thread
has been
used.
Use
the
correct spool
disc.
Stitch plate or
hook
tip
damaged.
Iake
your
machine
to
your
BERNINA
dealer.
Lower thread
breaks
The lower thread tension
is
too
tight.
The bobbin
is
jamming
in
the bobbin
case.
Remove
and
replace
the bobbin.
The hole
in
the stitch plate
has
been
damaged
by
the
needle.
This must
be
repolished by
an
expert.
The
needle
is
blunt or
bent.
Skipped stitches
Wrong
needles used.
Use
only 130/705H
system.
The
needle
is
blunt,
bent
or
incorrectly
inserted.
Push
right to the top when inserting.
Needle
inserted all
the
way
to the top.
The
needle
point
does
not suit
the fabric
being
sewn.
lf
necessary
use
a
ball point
for knítted
fabrics
and
cutting
point
for
hard
leather.
"
-)
Needle breaks
Needle clamp screw
loose.
Fabric
taken
out
in
front of
instead
of
behind
the
presser
foot.
When
sewing over
thick
area,
the
fabric
was
pushed
with
the
needle
still
in
the fabric.
Poor
quality thread,
unevenly
wound or
knotted.
Faulty
stitching
Remnants
of
thread
between
the tension
discs.
Remnants
of thread
under
the bobbin
case
spring.
Lower
thread still
threaded
in
the bobbin
case
finger
Machine threaded with
foot
down.
lncorrect threading.
Check
upper and
lower
threads.
Use
the
correct
spool
disc.
Machine
fails
to
run or
runs
slowly
Plug
not
properly
inserted.
Power
swítch in
off
position.
Machine
has been standing in
a
cold room
Bobbin
winder
still
switched
on.
Machine sews in
reverse
Reverse
sewing
function
is
still
activated
)
)
)
)
)
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