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PROBLEM PROBABLE CAUSE CORRECTION
Skipping
Stitches
Breaking Upper
Thread
Breaking Bobbin
Thread
Fabric not
Moving
Machine Jamming
Knocking Noise
Incorrect size needle.
Certain knits and synthetics.
Bent or blunt needle.
Incorrect setting of needle.
Tight upper thread tension.
Light pressure on presser foot.
Choose correct size needle for thread and fabric.
Use "Q NEF, I)I,E",_.
Insert new needle.
Reset needle.
Loosen upper thread tension.
Increase pressure on presser foot.
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
plate.
Improper bobbin case threading.
Tight bobbin thread tension.
Lint in bobbin case or shuttle.
Feed dog down.
Light pressure on presserfoot.
Thread knotted under fabric.
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.
Check bobbin case threading.
Loosen bobbin thread tension.
Clean bobbin case and shuttle.
Raise feed dog.
Increase pressure on presser foot.
Place both threads back under presser foot before
beginning to stitch.
Thread caught in shuttle.
Disassemble and clean shuttle.
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