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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 fabric.
Bent or blunt needle. Insert new needle.
Skipping Stitches Incorrect setting of needle. Reset needle.
Tight upper thread tension. Loosen upper thread tension.
Breaking Upper Thread
Starting to stitch too fast.
Improper threading.
Tight upper thread tension.
Incorrect size needle.
Sharp eye in needle.
Nicks or burrs on shuttle.
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.
Nicks o_bun_ at hole of_eedle plate_ Rep!ane needlep_ po!isl_of_burr_€on_y.
Breaking Bobbin Thread Improl_er bobbin casethreading. Check bobbin casethreading.
Lint in bobbin caseor shuttle, Clean bobbin caseand shuttle.
Fabric not Moving
Machine Jamming Knocking Noise
Darning plate in place.
Stitch Length set at 0.
Thread knotted under fabric.
Remove darning plate.
Adjust Stitch Length Control.
Place both threads back under presser foot before beginning
to stitch.
Thread caught in shuttle. Disassemble and clean shuttle.
Lint in bobbin case or shuttle. Clean bobbin case and shuttle.
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