Performance Checklist - Singer S900 Manuel D'instruction

6. PERFORMANCE CHECKLIST

GENERAL PROBLEMS
Machine does not sew.
* Power switch is turned off.- Turn on the switch.
* Buttonhole lever is not raised when sewing stitch patterns.
* Buttonhole lever is not lowered when sewing buttonhole.
Machine jams/knocks.
* Thread is caught in hook.-
* Needle is damaged.-
Fabric does not move.
* Presser foot is not lowered - Lower presser foot.
STITCHING PROBLEMS
Machine skips stitches.
* Needle is bent or blunt. -
* Thread is caught in hook. -
* Fabric is being pulled or pushed against machine feeding
action. -
* Bobbin has not been wound evenly. - Rewind bobbin.
Needle breaks.
* Fabric is being pulled or pushed against machine feeding
action. -
* Too much thread appears on the underside of stitching.
THREAD PROBLEMS
Thread bunches.
* Top and bobbin threads are not drawn back under presser
foot before starting seam. -
stitches are formed.
Needle thread breaks.
* Needle is bent. -
Bobbin thread breaks.
* Lint accumulates in bobbin case or hook. - Remove lint
Fabric puckers.
* Top thread tension is too tight. -
stitch length.
96
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