White 4050 - Page 51

Page47
Section
7
English
PROBLEM
PROBABLE
CAUSE
CORRECTION
The
material
puckers
Upper
or
lower
thread
tension
too
tight
P.12,
P.51
Stitch
too
long
for
material
P.22
Thread
too
thick
P.20
Incorrect
threading
of
upper
or
lower
thread
P.7,
P.16
Breaking
needle
Needle
not
correctly
inserted
P.18
Needle
bent
P.18
Needle
clamp
screw
too
loose
P.18
Upper
thread
tension
too
tight
P.12
Needle
too
fine
for the
material
P.20
Dials
have
been
changed
while
the
needle
was
down
in
the
P.22
material
If
trouble
is
still apparent
in
the
machine,
please
consult
your
nearest
dealer.
Do
not
try
to
correct
fault
by
yourself.
4