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SECTION
4.
PERFORMANCE
PROBLEMS
CHART
PROBLEM
PROBABLE CAUSE
CORRECTION
Incorrect size needle.
Choose correct size needle for thread and fabric.
Bent or blunt needle.
Insert new needle.
Skipping Stitches
Incorrect setting of needle.
Reset needle.
Tight upper thread tension.
Loosen upper thread tension.
Starting to stitch too fast.
Start to stitch at a medium speed.
Improper threading.
Rethread machine.
Tight upper thread tension.
Loosen upper thread tension.
Breaking Upper Thread
Incorrect size needle.
Choose correct size needle for thread end fabric.
Sharp eye in needle.
Insert new needle.
Nicks or burrs on shuttle.
Replace shuttle, or polish off burrs completely.
Nicks or burrs at hole of needle plate.
Replace needle plate, or polish off burrs completely.
Breaking Bobbin Thread
Improper bobbin case threading.
Check bobbin case threading.
Lint in bobbin case or shuttre.
Clean bobbin case and shuttle.
Darning prate in place.
Remove darning plate.
Fabric not Moving
Stitch Length set at O.
Adjust Stitch Length Control.
Thread knotted
under fabric.
Place both threads back under presser foot before beginning
to stitch.
Thread caught in shuttle.
Disassemble and clean shuttle.
Machine Jamming Knocking Noise
Lint in bobbin case or shuttle.
Clean bobbin case and shuttle.
37
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