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SECTION 4. PERFORMANCE PROBLEMS CHART
What to Do When
PROBLEM PROBABLE CAUSE CORRECTION
incorrect size needle. Choose correct size needle for thread and labric.
Skipping Stitches Bent or blunt needle. Insert new needle,
incorrect setting ot needle. Reset needle.
Tight upper thread tension. Loosen upper thread tension.
Breaking Upper Thread
Starting to stitch too last.
improper threading.
Tight upper thread tension.
incorrect size needle.
Sharp eye in needle.
Nicks or burrs on shuttle.
Nicks or burrs at hole ot needle plate.
Start to stitch at a medium speed.
Rethread machine.
Loosen upper thread tension.
Choose correct size needle tor thread and fabric.
insert new needle.
Replace shuttle, or polish off bum 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.
Darning plate in place. Remove darning plate.
Fabric not Moving Stitch Length set at O. Adjust Stitch Length Control.
Thread knotted under tabric. Place both threads back under presser foot be|ore beginning
to stitch.
Machine Jamming Knocking Noise Thread caught in shuttle. Disassemble and clean shuttle.
Lint in bobbin case or shuttle. Clean bobbin case and shuttle.
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