SINGER W311 BBS - Manual (Page 31)

Trouble
Prabable Cause
Correction
Upper Thread
Breaking
Improperly threaded
Refer to therading instructions. See page 8
and rethread machine.
Too much tension
Loosen tension on upper thread by turning
thread tension knob to lower number.
Starting with take-up
in incorrect position
Always start sewing with take-up lever in
highest position. .........................................................................................
Improper setting of
needle
Refer to needle setting instruction. See page 5.
Bent or eye of needle
too sharp
Try a new needle.
Bent or blunt needle
Discard all blunt or bent needles and replace
with new one.
Material
Puckering
Tensions too tight
1
See tension adjustment page 10.
Dull needle
Change needle.
Stitch length too long
Reduce stitch length.
2v