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What to Do When (Continued)
SECTION 4. PERFORMANCE PROBLEMS CHART
PROBLEM PROBABLE CAUSE CORRECTION
Incorrect size needle. Choose correct size needle for thread and fabric.
Bent or blunt needle. Insert new needle.
Skipping Stitches Incorrect setting of needle. Reset needle.
Tight upper thread tension. Loosen upper thread tension.
Breaking Upper Thread
Starting to stitch too fast.
Improper threading,
Tight upper thread tension:
Incorrect size needle.
Sharp eye in needle.
Nicks or burrs on shuttle.
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 thread and fabric.
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.
Lint in bobbin case or shuttle. Clean bobbin case and shuttle.
Darning plate in place. Remove darning plate.
Fabric not Moving Stitch Length set at 0. Adjust Stitch Length Control.
Thread knotted under fabric. Place both threads back under presser foot before beginning
to stitch.
"I'L .. - -- J ..... L = =,_ _L=_._I-- r_ • , I _1 s J •.,
_lL.un_n_Tnbobbin case or shuttie_ Ciean bobbin case ands_
35
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