Performance Checklist - Singer 7258 Manual De Instrucciones

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.
– Raise buttonhole lever.
* Buttonhole lever is not lowered when sewing buttonhole.
– Lower buttonhole lever.
* Bobbin winder is engaged. – Disengage bobbin winder (see
page 16 - 17).
Machine jams/knocks.
* Thread is caught in hook.- Clean hook (see page 70 - 71).
* Needle is damaged.- Replace needle (see page 26 - 27).
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
26 - 27).
* Needle is bent or blunt. - Replace needle (see page
26 - 27).
* Machine is not threaded correctly (see page 20 - 21).
* Thread is caught in hook. - Clean hook (see page 70 - 71).
Stitches are irregular.
* Needle size is not correct for thread and fabric (see page
26 - 27).
* Machine is not threaded correctly (see page 20 - 21).
* Top thread tension is too loose (see page 28 - 29).
* 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
26 - 27).
* Needle is not all the way up into the needle clamp (see page
26 - 27).
* Twin needle is being used but stitch width is set too wide (see
page 72 - 73).
* Too much thread appears on the underside of stitching.
* Upper thread not correctly thread (see page 20 - 21).
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 20 - 21).
* Top thread tension is too tight (see page 28 - 29).
* Needle is bent. - Replace needle (see page 26 - 27).
* Needle size is not correct for thread and fabric (see page
26 - 27).
Bobbin thread breaks.
* Bobbin case is not threaded correctly (see page 18 - 19).
* Lint accumulates in bobbin case or hook. - Remove lint
(see page 70 - 71).
Fabric puckers.
* Top thread tension is too tight. - Adjust thread tension
(see page 28 - 29).
* Stitch length is too long for sheer or soft fabric. - Shorten
stitch length.
80