Operation Manual

Problem
Cause
Solution
The
machine
does
The
electric
power
has
Close
the
looper
cover
not
operate
although
been
cut.
(see
page
12).
the
main
switch
is
switched
on.
The
fabric
is
not
Lint
between
the
upper
Clean
the
knife
trimmed
neatly.
and
lower
knife.
(see
page
81).
The
lower
knife
is
blunt.
Change
lower
knife
(see
page
79).
Gathering
of
the
The
thread
tension
is
Reduce
thread
tension
seam.
too
tight.
(particularly
for
light
fabrics
see
page
42
—
47).
The
differential
feed
is
Correct
differential
feed
incorrectly
set.
(see
page
27,
28).
.
The
thread
is
incorrectly
Thread
correctly
thread
and
has
got
caught
(see
page
13
—
21).
83