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SECTION;-4. PERFORMANCEPROBLEMSCHART
PROBLEM PROBABLE CAUSE CORRECTION
Sk;ppmg Stitches
Breaking Uppel Thlead
Breaking Bobbin Thread
Fabric not Moving
t_correct size needle,
Bent or blunt needle.
Incorrect setting of needle.
Tight upper thread tension.
Choose correct size needle for thread and fabric.
Insert new needle.
Reset needle.
Loosen upper thread tension.
Machine Jamming Knocking Noise
Starting to stitch too fast.
improper threading.
Tight upper thread tension.
Incorrect size needle.
Sharp eye in needle.
Nicks or burrs at hole of needle plate.
Start to stitch at a medium speed.
Rethread machine.
Loosen upper thread tension.
Choose correct size needle for lhread and fabric.
Insert new needle.
Replace needle plate, or polish off burrs completely.
Improper bobbin threading. Check bobbin threading.
Lint in bobbin holder or hook race.
Darning plate in place.
Stitch Length set at O.
Thread knotted under fabric.
Push-pull clutch is disengaged.
Thread caught in hook race.
Lint in bobbin holder or hook race.
Clean bobbin holder and hook race•
Remove darning plate.
Adjust Stitch Length Control.
Place both threads back under presser foot before beginning
to stitch.
Push in the clutch.
Disassemble and clean hook race.
Clean bobbin holder and hook race.
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