White S-9000AAB - Page 37

36
Trouble
Probable
Cause
Correction
Skipping
Bent
needle
Discard
and
replace.
Stitches
Needle
placed
See
instruction,
page No.
6.
incorrectly
in
clamp
Too fine
a
needle
See
needle
and
thread
chart,
page
No.
4.
for
thread
being
used
Irregular
Upper
thread
tension
Tighten
upper
tension.
Sititches
too
loose
Improper
threading
See
threading
instruction,
page No.
5
Bobbin
not
wound
Rewind
bobbin.
evenly
Uneven
Pulling
or
holding
Avoid
pulling
or holding
material,
just guide
it.
Stitches
material
Not
enough
tension
Increase
tension.
on
upper
thread
Poor
quality
thread
Try different
thread.
Needle
too
fine
for
See
needle
and
thread
chart,
page
No.
4.
thread_being_used