Operation Manual

5.
LOWER
THREAD
BREAKS
•
bobbin
case
threaded
incorrectly
•
bobbin
case
inserted
incorrectly
in
machine
•
bobbin
wound
unevenly
•
bobbin
wound
too
full
•
bobbin
tension
too
tight
• needle
plate
hole
has sharp
edges
•
bent
bobbin
•
poor
quality
thread
6. FABRIC
PUCKERS
•
bent
or
blunt
needle
•
upper
thread
tension
too
tight
•
both
upper
and
lower
tensions
too
tight
•
using
two
different
sizes
or
kinds of
thread
•
fabric
too
sheer
or
soft
(use
tissue
paper
underlay)
7.
MACHINE
DOES
NOT
FEED
FABRIC
•
stitch length
knob set
at
0
•
fabric
feed
on
(
)
•
presser
foot
not
down
completely
•
thread
knotted
under
fabric
8.
BUNCHING
OF
THREAD
UNDER
FABRIC
•
upper
and
lower
threads
not
drawn back
under
presser
foot
•
fabric
feed
on
(
)
9.
BOBBIN
DOES
NOT WIND
PROPERLY
•
incorrect
threading
for
winding
•
thread
guide
not
properly
adjusted
•
bobbin
spindle
not
positioned
correctly
•
bobbin
winder
stop
not
positioned
correctly
10.
MACHINE
RUNS
SLUGGISHLY
•
dirt
or
lint
between
teeth
of
fabric
feed
• dirt
or
lint
in
shuttle
•
machine
needs
oiling
•
stop
motion
knob
not
tightened
11.
MACHINE
WILL
NOT
SEW
•
cord
not
plugged
into
outlet
•
cord
not
plugged
into
“Motor”
socket
in
cabinet
or
case
•
stop
motion
knob
not
tightened
•
motor
belt
too
loose
or
broken
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