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21.
TROUBLE
CHART
PROBLEM
PROBABLE
CAUSE
CORRECTION
Breaking
lower
Thread
not
wound
evenly
on
the
bobbin
P10,
P15
thread
or
not
drawn
up
correctly
Lower
thread
tension
too
tight
P12
Lint
stuck
in
the
bobbin
case
and
inside
Remove
lint
the
tension
spring
and
fluff
with
a
cleaning
brush
Skipping
stitches
Needle
not
fully
inserted
P
6
Needle
bent
P
6
Size
or
type
of
needle
and
thread
not
P16
suitable
for
the
material
Incorrect
upper
threading
P13
Too
much
oil
on
the
hook
P45
Irregular
stitches
Incorrect
size
of
needle
for
the
material
P16
Upper
thread
tension
too
loose
P20
Incorrect
lower
tension
P12
Th
material
not
Pattern
selection
dial
not
set
correctly
P17
fed
correctly
Incorrect
feed
dog
height
P12
Lint
stuck
on
the
feed
dog
P44
Noisy
machine
I
Check
for
thread
in
race,
the
P45
slightest
amount
of
thread
in
race
may
cause
noise
or
binding,
use
material
like
tooth
pick
or
cotton
swab
to
clean.
—46—