Singer SC220 Instruction Manual page 36

PERFORMANCE CHECKLIST
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. - Threading the thread again (see page 7).
* Top thread tension is too tight. - Adjust the top tension (see page 11).
* Needle is bent. - Replace needle (see page 10).
* Needle size is not correct for thread and fabric. - Reinstall the needle (see page 10).
Bobbin thread breaks.
* Bobbin case is not threaded correctly. - Threading the bobbin thread again (see page 6).
* Lint accumulates in the bobbin case or the shuttle race. - Remove lint (see page 32).
Fabric puckers.
* Top thread tension is too tight. - Adjust the thread tension (see page 11).
* Stitch length is too long for sheer or soft fabric. - Shorten stitch length.
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