64 5. performance checklist – SINGER 7412 User Manual

Page 64

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64

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 14 - 15).

Machine jams/knocks.
* Thread is caught in hook.- Clean hook (see page 60 - 61).
* Needle is damaged.- Replace needle (see page 22 - 23).
Fabric does not move.
* Presser foot is not lowered - Lower presser foot.
* Stitch length is too short - Lengthen stitch length.
* Darning plate is placed on needle place - Remove darning plate.

STITCHING PROBLEMS

Machine skips stitches.
* Needle is not all the way up into needle clamp. - See page

22 - 23.

* Needle is bent or blunt. - Replace needle (see page 22 -

23).

* 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

22 - 23.

* Machine is not threaded correctly. - See page 18 - 19.
* Top thread tension is too loose. - See page 24 - 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

22 - 23.

* Needle is not all the way up into the needle clamp. - See page

22 - 23.

* Twin needle is being used but stitch width is set too wide.
- See page 62 - 63.

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 24 - 25.
* Needle is bent. - Replace needle (see page 22 - 23).
* Needle size is not correct for thread and fabric - See page 22

- 23.

Bobbin thread breaks.
* Bobbin case is not threaded correctly. - See page 16 - 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 24 - 25).
* Stitch length is too long for sheer or soft fabric. - Shorten

stitch length.

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