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21.
TROUBLE
CHART
PROBLEM
PROBABLE
CAUSE
CORRECTION
Breaking
lower
Thread
not
wound
evenly
on
the
bobbin
P.10,
P.15
thread
or
not
drawn
up
correctly
Lower
thread
tension
too
tight
P.12
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
P
1
6
suitable
for
the
material
Incorrect
upper
threading
P.1
3
Too
much
oil
on
the
hook
P.46
Irregular
stitches
Incorrect
size
of
needle
for
the
material
P.1
6
Upper
thread
tension
too
loose
P.20
Incorrect
lower
tension
P.12
The
material
not
Pattern
selection
dial
not
set
correctly
P.
1
7
fed
correctly
Incorrect
feed
dog
height
P.12
Lint
stuck
on
the feed
dog
P.45
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