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Troubleshooting
Appendix A-9
MAINTENANCE AND TROUBLESHOOTING
A
l
Remove any threads in the race and around the feed
dogs.
m
Turn the handwheel to raise the feed dogs.
n
Align the two screw holes in the needle plate with the
two holes at the needle plate mounting base, and then
fit the needle plate onto the machine.
o
Lightly finger-tighten the screw on the right side of the
needle plate. Then, use the L-shaped (or disc-shaped)
screwdriver to firmly tighten the screw on the left side.
Finally, firmly tighten the screw on the right side.
Turn the handwheel to check that the feed dogs move
smoothly and do not contact the edges of the slots in the
needle plate.
1 Correct position of feed dogs
2 Incorrect position of feed dogs
p
Insert the bobbin case so that the S mark on the
bobbin case aligns with the
z mark on the machine.
Align the S and
z marks.
1 S mark
2
z mark
3 Bobbin case
Make sure that the indicated points are aligned
before installing the bobbin case.
q
Attach the needle plate cover according to step j in
“Cleaning the race” on page A-2.
r
Check the condition of the needle, and then install it.
If the needle is in a poor condition, for example, if it is
bent, be sure to install a new needle.
Refer to “Checking the needle” and “Replacing the
needle” in the “Basic operations” section.
Note
Be careful not to drop the removed screws in the
machine.
a
b
b
a
CAUTION
Never use a bobbin case that is scratched,
otherwise the upper thread may become
tangled, the needle may break or sewing
performance may suffer.
Make sure that you fit the bobbin case
properly, otherwise the needle may break.
CAUTION
Never use bent needles. Bent needles can
easily break, possibly resulting in injuries.
Note
After completing this procedure, continue with
the following procedure in “Checking machine
operations” to check that the machine is
operating correctly.
Memo
Since the needle may have been damaged when
the fabric was caught in the machine, we
recommend replacing it with a new one.
129


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