Problem probable cause correction – Kenmore 1250 User Manual
Page 42
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PROBLEM
PROBABLE CAUSE
CORRECTION
incorrect size needle.
Choose correct size needle for thread and fabric.
Certain knits and synthetics.
Use "Q NEKDLEV,
Skipping
Bent or blunt needle.
Insert new needle.
Stitches
Incorrect setting of needle.
Reset needle.
Tight upper thread tension.
Loosen upper thread tension.
Light pressure on presser foot.
increase pressure on presser foot.
Starting to stitch too fast.
Start to stitch at a medium speed.
improper threading.
Rethread machine.
Tight upper thread tension.
Loosen upper thread tension.
Breaking Upper
Incorrect size needle
Choose correct size needle for thread and fabric.
Thread
Sharp eye in needle.
Nicks or burrs on shuttle.
Nicks or burrs at hole of needle
plate.
Insert new needle.
Replace shuttle, or polish off burrs completely.
Replace needle plate, or polish off burrs completely.
Breaking Bobbin
Thread
improper bobbin case threading.
Check bobbin case threading.
Tight bobbin thread tension.
Loosen bobbin thread tension.
Lint in bobbin case or shuttle.
Clean bobbin case and shuttle.
Feed dog down.
Raise feed dog. ’
Fabric not
Light pressure on presser foot.
Increase pressure on presser foot.
Moving
Thread knotted under fabric.
Place both threads back under presser foot before
beginning to stitch.
Machine Jamming
Knocking Noise
Thread caught in shuttle.
Disassemble and clean shuttle.