Brother SB3150 Operation Manual page 127

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
Note
• Be careful not to drop the removed screws in the
machine.
p Insert the bobbin case so that the
bobbin case aligns with the
• Align the and marks.
1
mark
2
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.
q Attach the needle plate cover according to step
"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.
CAUTION
• Never use bent needles. Bent needles can
easily break, possibly resulting in injuries.
Troubleshooting
mark on the
mark on the machine.
a
b
a b
j
in
Appendix A-9
A