■ Upper Thread is Too Tight
If the bobbin thread is visible from the right side of
the fabric, the upper thread is too tight.
• If the bobbin thread was incorrectly
threaded, the upper thread may be too tight.
In this case, refer to "Setting the Bobbin"
(page 54) and rethread the bobbin thread.
a Bobbin thread
b Upper thread
d Locks appear on surface of fabric
, to loosen the upper thread.
• When you finish sewing, remove the bobbin
cover and then make sure that the thread is
shown as below. If the thread is not shown
as below, the thread is not inserted through
the tension-adjusting spring of the bobbin
case correctly. Reinsert the thread correctly.
For details, refer to page 54.
■ Upper Thread is Too Loose
If the upper thread is visible from the wrong side of
the fabric, the upper thread is too loose.
• If the upper thread was incorrectly threaded,
the upper thread may be too loose. In this
case, refer to "Upper Threading" (page 57)
and rethread the upper thread.
a Upper thread
b Bobbin thread
c Wrong side
d Locks appear on wrong side of fabric
, to tighten the upper thread.
to return the thread tension to
the original setting.