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 casethreading.
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 presserfoot before beginning
to stitch.
Thread caught in shuttle. Disassemble and clean shuttle.
Machine Jamming Knocking Noise
Lint in bobbin case or shuttle. Clean bobbin caseand shuttle.
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