Performance Checklist - Blaupunkt COMFORT 930 Manuel

4. 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. – Raise buttonhole lever.
* Buttonhole lever is not lowered when sewing buttonhole. – Lower buttonhole lever.
* Bobbin winder is engaged. – Disengage bobbin winder (see page 5).
Machine jams/knocks.
* Thread is caught in hook. - Clean hook (see page 32).
* Needle is damaged. - Replace needle (see page 10).
Fabric does not move.
* Presser foot is not lowered - Lower presser foot.
* Stitch length is too short - Lengthen stitch length.
STITCHING PROBLEMS
Machine skips stitches.
* Needle is not all the way up into needle clamp (see page 10).
* Needle is bent or blunt. - Replace needle (see page 10).
* Machine is not threaded correctly (see page 7).
* Thread is caught in hook. - Clean hook (see page 32).
Stitches are irregular.
* Needle size is not correct for thread and fabric (see page 10).
* Machine is not threaded correctly (see page 7).
* Top thread tension is too loose (see page 11).
* Fabric is being pulled or pushed against machine feeding action. - Guide it gently.
* Bobbin has not been wound evenly. - Rewind bobbin.
Needle breaks.
* Fabric is being pulled or pushed against machine feeding action. - Guide it gently.
* Needle size is not correct for thread and fabric (see page 10).
* Needle is not all the way up into the needle clamp (see page 10).
* Twin needle is being used but stitch width is set too wide (see page 30).
* Too much thread appears on the underside of stitching.
* Upper thread is not correctly thread (see page 7).
THREAD PROBLEMS
Thread bunches.
*Top and bobbin threads are not drawn back under presser foot before starting seam. - Draw both
threads back under presser foot about 6 inches (10 cm) and hold until a few stitches are formed.
Needle thread breaks.
* Machine is not threaded correctly (see page 7 ).
* Top thread tension is too tight (see page 11).
* Needle is bent. - Replace needle (see page 10).
* Needle size is not correct for thread and fabric (see page 10).
Bobbin thread breaks.
* Bobbin case is not threaded correctly (see page 6).
* Lint accumulates in bobbin case or hook. - Remove lint (see page 32).
Fabric puckers.
* Top thread tension is too tight. - Adjust thread tension (see page 11).
* Stitch length is too long for sheer or soft fabric. - Shorten stitch length.
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