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PROBLEM
Skipping Stitches
Breaking Upper Thread
PROBABLE CAUSE
Incorrect size needle.
Certain knits and synthetics,
Bent or blunt needle,
incorrect setting of needle.
Tight upper thread tension.
Starting to stitch too fast.
Improper threading.
Tight upper thread tension,
Incorrect size needle.
Sharp eye in needle.
Nicks or burrs on shuttle.
Nicks or burrs at hole of needle ptate.
CORRECTION
Choose correct s_ze needle for thread and fabric.
Use "Q NEEDLE',',,.
insert new needle.
Reset needle.
Loosen upper thread tension.
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.
Fabric not Moving
Darning plate in place.
Stitch Length set at 0.
Thread knotted under fabric.
Thread caught in shuttle.
Machine Jamming Knocking Noise Lint in bobbin case or shuttle.
Remove darning plate.
Adjust Stitch Length Control.
Place both threads back under presser foot before beginning
to stitch.
Disassemble and clean shuttle.
Clean bobbin case and shuttle.
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