White 1521 - Troubleshooting Common Problems

CHECKING
PERFORMANCE
PROBLEMS
- TROUBLESHOOTING
Problem
Probable
cause
What
to
do
- Feed
dog
down
- Raise
feed
dog
Fabric does
not
- Stitch
length
dial
on
,,O”
- Set
dial
between 1
and
4
move
- Light
presser
foot
pressure
- Increase
pressure
-
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
- Incorrect
insertion
of
needle
- Re-insert
needle
Breaking
bobbin
- Improper
threading
-
Rethread
machine
thread
-
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
match
thread
according
to
type
of
fabric
-