Operation Manual

Prob’em
Cause
So’ution
Machine
does
not
Power
supply
interrupted
Close
looper
cover
10
or
run
although
mas-
looper
cover
1 0 or
work
support
1
2
(see
p.
7(
ter
switch
is
on
work
support
1
2
(see
p.
7(
Fabric
not
neatly
Sewing
lint between
upper
Clean
knives
(see
p.
32)
trimmed
and
lower
knife
Upper
knife
blunt
Exchange
upper
knife
(see
p.
30)
Puckered
seams
Thread
tension
too
tight
Reduce
thread
tension
(especially
for
light
materials)
(pp.
15—16)
Incorrect
setting
of
Re-adjust
differential
feed
differential
feed
Thread
has
caught
due
to
Thread
correctly
(pp.
7—11)
incorrect
threading
Puckered
seams
Inadequate
sewing
foot
Insert
sewing
foot
adequate
used
for
seam
width
sewn
for
the
seam
width
(see
top
of
p.
35>
Edge
thread
Inadequate
sewing
foot
insert
sewing
foot
adequate
too loose
used
for
seam
width
sewn
for
the seam
width
(see
top
of
p.
35)
41