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Cause
and
remedy
of
faults
f6.
Please
always
remember:
many
faults
can
be
remedied
merely
by
cleaning
and
oiling
the
machine.
Machine
works
heavily
1.
The
driving
strop
is
either
too
tight
or
too
slack
length
en
or
shorten
the
strap,
or,
-
if-
necessary,
fit
a
new
one
to
the
machine.
2.
Some
of
the
working
ports
of
-the
mechanism
are
dry
--
apply
a
few
drops
of
oil
to
the
parts
concerned.
3.
The
machine
is
dirty
clean
it.
4.
The
machine
is
gummed
owing
to
the
use
of
unsuitoble
oil
clean
the
machine
with
paraffin.
Machine
is
noisy
1.
Some
of
the
working
ports
are
dry
oil
the
parts
c
once
r
ii
ed.
2,
Screws
ore
loose
tighten
them
with
the
aid
of
a
screw
-driver.
The
Upper
Thread
breaks
1.
Inferior
quality,
knotty
sewing
thread
breaks
easily
use
a
better
quality.
2.
The
needle
is
too
fine
for
the
thread
or
fabric
used
use
a
thicker
needle
(see
page
4:
“Relative
Needle
Sizes
and
Thread
Numbers”).
3.
The
Upper
thread
tension
is
too
strong
loosen
the
tension
(see
page
10:
“Regulating
the
Thread
Tensions”).
4.
The
eye
of
the
needle
has
a
knife
edqe
change
the
needle.
.
Dirt
and
fluff
are
interfering
with
the
free
movement
of
the
feed
dog,
causing
intermittent
feeding
of
the
material
remove
needle
plate
and
thoroughly
clean
the
feed.
6.
The
hole
in
needle
plate
has
developed
a
rough
edge
and
catches
the
thread
consult
a
sewing
machine
expert.
The
Under
Thread
breaks
1.
Inferior
quality,
knotty
sewing
thread
breaks
easily
use
a
better
quality.
2.
The
tension
of
shuttle
thread
is
too
strong
loosen
it
(see
page
10:
“Regulating
the
Thread
Tensions”).
3.
The
tension
of
shuttle
thread
is
too
weak
tighten
the
screw
(see
page
10:
“Regulating
the
Thread
Tensians”).
4.
The
hole
in
needle
plate
has
developed
a
rough
edge,
and
catches
the
thread
consult
a
sewing
machine
expert.
Stitches
are
skipped
1.
The
needle
has
been
set
either
too
high
or
too
low,
or
it
is
bent
or
blunt
straighten
it
or
use
a
new
needle
(see
page
5:
“Setting
the
Needle”).
2.
The
needle
is
either
too
thin
or
too
thick
for
the
thread
used
change
the
needle
or
use
a
different
thread
to
comply
with
the
details
given
in
the
chart
on
page
4:
(“
Relative
Needle
Sizes
and
Thread
Numbers”).
20
21
13


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