Hikari HK2900, Instruction Manual

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68
⑦ Polyester thread broken
by frictional heat
。
3.Threa easy
breaks
①
needle bended
。
②
needle touch presser
foot
。
③
needle too thick
。
④
needle bended too
much by the driver
。
⑤
presser foot press
sewing thread
（
needle
bended
）。
○
replace needle
。
○
adjust presser foot
。
○
choose appropriate needle
according sewing material
。
○
adjust needle and hook
position
。
○
increase the place between
needle and thread to
（
23~25mm
）
.
13
33
33
35
4.bad trimming
。 ①
fixed knife not sharp
。
②
the hight different
between needle guide
and fixed knife too
small
。
③
moving knife position
not perfect
。
④
needle skipped
。
⑤
bottom thread tension
too low
。
○
replace knife
。
○
make moving knife more
bended
。
○
adjust moving knife position
。
○
adjust needle and hook
synchronous
。
○
take high bottom thread
tension
。
34
33
5.Thread easily
jumps
①
needle and hook
setting is not good
。
②
the gap between needle
and hook is too big
。
③
needle bended
。
④
needle too bended by
driver
。
○
adjust needle and hook
position
。
○
adjust needle and hook
position,
○
replace needle
。
○
adjust driver position
。
33
33
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33