PROBLEM
Skipping Stitches
Breaking Upper Thread
Breaking Bobbin Thread
Fabric not Moving
Machine Jamming Knocking Noise
PROBABLE CAUSE
Incorrect size needle.
Bent or blunt needle.
Incorrect setting of needle.
Tight upper thread tension.
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.
Improper bobbin threading.
Lint in bobbin holder or hook race.
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Stitch Length set at 0. Thread knotted under fabric.
Thread caught in hook race.
Lint in bobbin holder or hook race.
CORRECTION
Choose correct size needle for thread and fabric. Insert new needle.
Reset needle.
Loosen upper thread tension.
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 needle plate, or polish off burrs completely.
Check bobbin threading.
Clean bobbin holder and hook race.
Remove darning nl_t_
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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