White SM2000 - Page 55

Page
46
Section
7
WflPa
7. TROUBLE
CHART
PROBLEM
PROBABLE
CAUSE
CORRECTION
—
Breaking
lower
thread
Thread
not wound
evenly
on the
bobbin
or
not
drawn
up
correctly
P.15,
P.7,
8
Lower
thread
tension
too
tight
P.50,
Lint
stuck
in the
bobbin
case
and
inside
the
tension
spring
Remove
lint
and
dust
with
a
cleaning
brush
Skipping
stitches
Needle
not
fully
inserted
or
inserted
incorrectly
P.18
Needle
bent
P.18
Size
or
type
of
needle
and
thread
not
suitable
for
the
material
R20
Incorrect
upper
threading
P.7
Too
much
lubrication
on
the
machine
P.45
Irregular
stitches
Incorrect
size
of
needle for
the
material
P.20
Upper
thread
tension
too
loose
P.12
Incorrect
lower
tension
P.50,
51
Fabric
is not
fed
Pattern
selection
dial
not
set
correctly
P.22
correctly
Lint
stuck
on
the
feed
dog
P.43
Noisy
machine
Check
for
thread
in
shule,
the
slightest
amount
of thread
in
1
P.43
shuttle
may
cause
noise
or binding,
use
cotton
swab
to clean.
P.52