White 915 - Trouble Chart

Page46
C
Ct3fl
7.
TROUBLE
CHART
PROBLEM
PROBABLE
CAUSE
CORRECTION
Breaking
bobbin
Thread
not
wound
evenly
on
the
bobbin
or
not
drawn
up
correctly
P.8,
R12,
P.16
thread
Bobbin
thread
tension
too
tight
P.50.
51
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
P.18
Needle
bent
P.18
Size
or
type
of
needle
and
thread
not
suitable
for
the
fabric
P.20
Incorrect
upper
threading
P.11
Too
much
oil
on
the
machine
P.45
Irregular
stitches
Incorrect
size
of
needle
for
the
fabric
P.20
Upper
thread
tension
too
loose
P.16
Incorrect
bobbin
tension
P.50,
51
Fabric
not
fed correctly
Stitch
selection
dial
not
set
correctly
P.22
L
Lint
stuck
on
the
feed
teeth
P.44
Noisy
machine
Check
for
thread
in
the shuttle,
as
the
slightest
amount
of
P.44
thread
in
the
shuttle
may
cause
noise
or
binding.
Use
cotton
P.52
swab
to
clean.
I
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