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Sewing
3. Adjusting thread tension
Before adjustment, check again that "P.16 [Threading the upper thread]" has been performed correctly.
Adjustment method for upper thread tension
Upper thread is tight Upper thread is loose
Turn down the upper thread
tension dial.
Turn up the upper thread
tension dial.
Note : If the tension does not change even when you turn the upper
thread tension dial, reset the upper thread.
Note : If it does not change with the upper thread, adjust the lower
thread.
Adjustment method for lower thread tension
Adjust by turning
the bobbin case
adjustment screw with
the accessory screw
driver.
Turn right to tighten
the tension
Turn left to loosen the
tension
After adjusting the tension of
the bobbin case, suspend
bobbin, bobbin case, and
shuttle hook all together and
hold the bobbin thread as
illustrated.
(Please refer to P.46)
Note:
When the bobbin case tension is
correct: the thread should slide
down with light resistance.
When the bobbin case tension is
too tight: the thread does not
slide down, or the thread jerks.
When the bobbin case tension is
too loose,: the thread easily
slides down with no resistance.
31


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