Operation Manual

Problem
Cause
Remedy
Machine
does
not
Power
suooly
interrupted
Close
looper
cover
12
or
work
sup-
run
although
main
port
15
(see
page
7)
switch
is
on
Fabric
not
neatly
Sewing
lint
between
upper
Clean
knives
(see
page
54).
trimmed
and
lower
knife
Upper
knife
blunt
Change
upper
knife
(see
page
42)
Puckered
seams
Thread
tension
too
tight
Reduce
thread
tension
(espicially
for
light
materials>
(pages 18—24)
Incorrect
setting
of
Red-adjust
differential
feed
differential
feed
Thread
has
caught
due
to
Thread
correctly
(pp.
8—
13)
incorrect
threading
Puckered
seams
Unsuitable
sewing
foot
Insert
sewing
foot
suitable
for
the
used
for
seam
width
sewn
seam
width
(see
top
of
page
45)
Edge
thread
Unsuitable
sewing
foot
Insert
sewing
foot
suitable
for
the
too
loose
used
for
seam
width
sewn
seam
width
(see
top
of
page
45)
Fabric
not
Sewing
foot
pressure
too
Increase
pressure
by
turning
knur
evenly
fed
weak
led
knob
for
sewing
foot
pressure
clockwise.
Untidy
stitch
Regulator
41 not
correctly
Set
regulator
41
corretly,
formation
set
see
page
15
53