Brother International SB3150 Operation Manual - Page 127

performance may suffer.

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Slightly lift up the needle plate, cut any tangled k threads, and then remove the needle plate. Remove the fabric and threads from the needle plate. Troubleshooting p Ibnosbebrtinthceasbeoablbiginnscawsiethsothtehazt thmeaSrk mark on the on the machine. a If the fabric cannot be removed, even after completing these steps, contact your nearest Brother authorized service center. Remove any threads in the race and around the feed l dogs. Turn the handwheel to raise the feed dogs. m Align the two screw holes in the needle plate with the n two holes at the needle plate mounting base, and then fit the needle plate onto the machine. Lightly finger-tighten the screw on the right side of the o needle plate. Then, use the disc-shaped screwdriver to firmly tighten the screw on the left side. Finally, firmly tighten the screw on the right side. b a b • Align the S and z marks. A MAINTENANCE AND TROUBLESHOOTING 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 Note • Be careful not to drop the removed screws in the machine. 1 S mark 2 z mark 3 Bobbin case • Make sure that the indicated points are aligned before installing the bobbin case. 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. Attach the needle plate cover according to step j in q "Cleaning the race" on page A-2. Check the condition of the needle, and then install it. r 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. CAUTION • Never use bent needles. Bent needles can easily break, possibly resulting in injuries. Appendix A-9

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Troubleshooting
Appendix
A-9
MAINTENANCE AND TROUBLESHOOTING
A
k
Slightly lift up the needle plate, cut any tangled
threads, and then remove the needle plate.
Remove the fabric and threads from the needle plate.
If the fabric cannot be removed, even after completing
these steps, contact your nearest Brother authorized
service center.
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 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.
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.
a
b
b
a