Kenmore 15 Instructions Manual page 33

PROBLEM
Skipping
Stitches
Breaking Upper
Thread
Breaking Bobbin
Thread
Fabric not
Moving
Machine Jamming
(Knocking Noise)
WHAT TO DO
PROBABLE CAUSE
Incorrect size needle.
Bent or blunt needle.
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.
CORRECTION
Choose correct size needle for thread and fabric (page 5).
Insert new needle (page 5).
Reset needle (page 5).
Loosen upper thread tension (page 12).
Increase pressure on presser foot (page 10).
Start to stitch at a medium speed.
Rethread machine (page 9).
Loosen upper thread tension (page 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 (page 13).
Clean bobbin case and shuttle (page 28, 29).
Raise feed dog (page 15).
Increase pressure on presser foot (page 10).
Place both threads back under presser foot before
beginning to stitch.
Disassemble and clean shuttle (page 28, 29).
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