Singer S900 - Performance Checklist

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