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WHAT TO DO
PROBLEM PROBABLE CAUSE CORRECTION
Skipping
Stitches
Breaking Upper
Threcd
Breaking Bobbin
Thread
Fabric not
Moving
Machine Jamming
(.Knocking Noise_
Incorrect size needJe.
Bent or blunt needJe.
Incorrect setting of needle.
Tight upper thread tension.
Light pressure on presser foot.
Starting to stitch too fast.
improper threading.
Tight upper thread tension.
Incorrect size needle.
Sharp eye in needle.
Improper bobbin case threading.
Tight bobbin thread tension.
Lint in bobbin case or shuttle.
Feed dog down.
Light pressure on presser foot.
Threads knotted under fabric.
Thread caught in shuttle.
Choose correct size needle for thread and fabric (page 5_.
Insert new needle (page 57.
Reset needle (page 5).
Loosen upper thread tension (page 12).
Increase pressure on presser foot Cpage 10).
Start to stitch at a medium speed.
Rethread machine _'page 9).
Loosen upper thread tension Cpage 12).
Choose correct size needle for thread and fabric (page 5).
Insert new needle (page 5).
Check bobbin case threading (page 8).
Loosen bobbin thread tension Cpage 13).
Clean bobbin case and shuttle _pages 34, 35).
Raise feed dog (page 10).
Increase pressure on presser foot (page 10_.
Place both threads back under presser foot before
beginning to stitch.
Disassemble and clean shuttle _pages 34, 35).
37
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