SECTION 4. PERFORMANCE PROBLEMS CHART
What to Do When (Continued)
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
Breaking Bobbin Thread
Fabric not Moving
Starting to stitch too fast,
Improper threading.
Tight upper thread tension_
Incorrect size needta.
_Sha_ eye in_.
Nicks or burrs on shuttle.
Nicks or burrs at hole of needle plate.
Improper bobbin casethreading.
Lint in bobbin caseor shuttle.
Darning plate in place.
Stitch Length set at O.
Thread knotted under fabric.
Start to stitch at a medium speed.
Rethread machine.
Loosen upper thread temion ....
correct size needle for thread and fabric.
rnsert new need|e_
Replace shuttle, or polish off burrs completely.
Replace needle plate, or polish off burrs completely.
Check bobbin casethreading.
Clean bobbin caseand shuttle.
Remove darning plate.
Adjust Stitch Length Control.
Place both threads back under presserfoot before beginning
to stitch.
35
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