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What to Do When (Continued)
PROBLEM PROBABLE CAUSE ! CORRECTION
Incorrect s_ze needle. Choose correct size needle for thread and fabric.
Certain knits and synthetics. Use "Q NEEDLE'/.,
Skipping Stitches Bent or blunt needle, insert new needle,
Incorrect setting of needle, Reset needle.
Tight upper thread tension. Loosen upper thread tension.
Breaking Upper Thread
Starting to stitch too fast.
Improper threading.
Tight upper thread tension.
Incorrect s_ze needle.
Sharp eve in needle.
Nicks or burrs on shuttle.
Nicks or burrs at hole of needle plate.
Start to stitch at a medium speed,
Rethread machine.
Loosen upper thread tension.
Choose correct size needle for thread and fabric,
Insert new needle.
Replace shuttle, or polish off burrs completely.
Replace needle plate, or polish off burrs completely,
Breaking Bobbin Thread Improper bobbin case threading. Check bobbin case threading.
Lint in bobbin case or shuttle, Clean bobbin case and shuttle.
Darmng ptate in place. Remove darning plate.
Fabric not Mowng Stitch Length set at 0. Adiust St{tch Length Control.
Thread knotted under fabnc. Place both threads back under presser foot before beginning
to stitch.
Thread caught in shuttle. Disassemble and clean shuttle.
Machine Jamming Knocking Noise
Lint m bobbin case or shuttle. Ctean bobbin case and shuttle,
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