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CHECKING
PERFORMANCE
PROBLEMS
-
TROUBLESHOOTING
Problem
Probable
cause
What
to
do
-
Feed
dog
down
-
Raise
feed
dog
Fabric
does
not
-
Stitch
length
dial
on
O
position
-
Set
dial
between
1
and
4
move
Light
presser
foot
pressure
-
Increase
pressure
-
Machine
not
moving
-
Moving
stop
motion
-
Incorrect
insertion
of
needle
-
Re-insert
needle
-
Bent
needle
-
Replace
needle
Breaking
needle
-
Fabric
is
being
pulled
-
Do
not
pull
fabric
-
Needle,
thread
and
fabric
do
-
Use
correct
needle
and
thread
not
match
-
Faulty
adjustment
of
zigzag
-
Re-adjust
zigzag
width
width
Breaking
upper
-
Improper
threading
-
Re-thread
machine
thread
-
Tight
upper
thread
tension
-
Reduce
upper
thread
tension
-
Bent
needle
-
Replace
needle
-
Scratches
or
nicks
on
shuttle
-
Polish
or
replace
shuttle
-
Tied
bobbin
thread
tension
-
Reduce
bobbin
thread
tension
Breaking
bobbin
-
Incorrect
insertion
of
needle
-
Re-insert
needle
thread
-
Improper
threading
-
Rethread
machine
-
Lint
or
thread
in
shuttle
-
Clean
shuttle
-
Excessive
tension
-
Readjust
tension
-
Presser
foot
pressure
to
strong
-
Change
pressure
accordingly
Machine
-
Needle,
thread
and
fabric
do
-
Choose
proper
needle
and
jamming
not
matchd
thread
according
to
type
of
fabric
-
No
oil
-
Need
oil
-
Tension
too
tight.
-
Reset.
-
Sewing
foot
pressure
too
-
Regulating
sewing
foot
Puckering
strong.
pressure.
-
Incorrect
using
fabric,
needle,
-
Correct
using
fabric,
needle
and
thread.
and
thread.
-
36
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