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Singer Quantum 9940 Manual

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PROBLEM
Upper thread
breaks
Lower thread
breaks
Machine skips
stitches
Fabric puckers
Machine makes
loose stitches or
loops
Stitch pattern is
misformed
Threader does
not thread
needle eye
Machine does
not feed properly
Needle breaks
Machine runs
with difficulty
Machine will not
run
HELPFUL HINTS
CORRECTION
Re-thread machine.
Remove entwined thread.
Re-insert needle.
Readjust thread tension.
Choose correct thread.
Re-thread the bobbin.
Rewind the bobbin.
Clean the holder.
Re-insert needle.
Insert new needle.
Choose correct size needle for
fabric.
(use stretch needle)
Re-thread machine.
Re-thread the bobbin.
Insert new needle.
Readjust thread tension.
Re-thread the bobbin.
Re-thread machine.
Readjust thread tension.
Attach correct foot.
Adjust the thread tension.
Raise the needle.
Re-insert needle.
Insert new needle.
Raise the feed dogs
Regulate stitch length.
Clean the feed dog area.
Increase pressure.
Do not pull fabric.
Select correct foot and pattern.
Re-insert needle.
Choose correct size needle and
thread.
Remove the needle plate and
bobbin holder and clean the
hook race and feed dog.
Insert plug fully into outlet.
Turn on the switch.
Push spindle to the left.
Lower the foot.
Lower the buttonhole lever.
Attach the buttonhole foot.
CAUSE
Machine not properly threaded.
Thread entwined around bobbin.
Needle inserted incorrectly.
Thread tension too tight.
Thread of incorrect size or poor quality.
Bobbin threaded incorrectly.
Bobbin wound unevenly or too full.
Dirt on the bobbin holder.
Needle inserted incorrectly.
Bent or blunt needle.
Incorrect size of needle.
(on stretch fabric)
Machine not properly threaded.
Bobbin threaded incorrectly.
Blunt needle.
Thread tension too tight.
Bobbin threaded incorrectly.
Machine not properly threaded.
Tension not adjusted properly.
Presser foot is not suited for the pattern.
Thread tension is not balanced.
Needle is not raised.
Needle inserted incorrectly.
Bent needle.
Feed dogs are lowered
Stitch length not suitable for fabric.
Lint and dust accumulated around feed dog.
Pressure regulator set too low.
Fabric pulled while sewing.
Needle is hitting the presser foot.
Needle inserted incorrectly.
Incorrect size needle or thread for fabric
being sewn.
Dirt or lint accumulated in the hook race and
feed dog.
Cord not plugged into electrical outlet.
Power switch is not turned on.
Bobbin winder spindle is pushed to the right.
Presser foot is not lowered.
Buttonhole Sewing Mode;
* Buttonhole lever is not lowered completely.
* Buttonhole foot is not attached.
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9940EFSt.pm6 2003.9.10, 8:33 PM90
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