SINGER 6680 - Manual (Page 65)

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5. 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 16).
Machine jams/knocks.
* Thread is caught in hook.
- Clean hook (see page 60 - 61).
* Needle is damaged.
- Replace needle (see page 24).
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 24).
* Needle is bent or blunt.
- Replace needle (see page 24).
* Machine is not threaded correctly (see page 18 -19).
* Thread is caught in hook.
- Clean hook (see page 60 - 61).
Stitches are irregular.
* Needle size is not correct for thread and fabric (see page 24).
* Machine is not threaded correctly (see page 18 - 19).
* Top thread tension is too loose (see page 25).
* 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 24).
* Needle is not all the way up into the needle clamp (see page 24).
* Too much thread appears on the underside of stitching.
* Upper thread not correctly thread (see page 18 - 19 ).
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 18 - 19).
* Top thread tension is too tight (see page 25).
* Needle is bent. - Replace needle (see page 24).
* Needle size is not correct for thread and fabric (see page 22 - 23).
Bobbin thread breaks.
* Bobbin case is not threaded correctly (see page 17).
* Lint accumulates in bobbin case or hook.
- Remove lint (see page 60 - 61).
Fabric puckers.
* Top thread tension is too tight.
- Adjust thread tension (see page 25).
* Stitch length is too long for sheer or soft fabric.
- Shorten stitch ngth.