Brother LB6770 PRW Operation Manual page 155

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g Use the cleaning brush or a vacuum cleaner to
remove any lint and dust from the race and
bobbin thread sensor and their surrounding
area.
c
a Cleaning brush
b Race
c Bobbin thread sensor
Note
Do not apply oil to the bobbin case.
If lint or dust collects on the bobbin thread
sensor, the sensor may not operate correctly.
h Insert the bobbin case so that the projection
on the bobbin case aligns with the spring.
c
a Bobbin case
b Projection
c Spring
Memo
Move the bobbin case right and left to make
sure that the right side of the projection
touches the spring and there is a space on
the left side of the projection.
b
a
b
c
b
i Insert the tabs on the needle plate cover into
the needle plate, and then slide the cover back
on.
a
a Needle plate cover
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. For a new
bobbin case (part code: XC3152-221
(green marking)), contact your nearest
authorized service center.
● Be sure that the bobbin case is correctly
installed, otherwise the needle may break.
a
Care and Maintenance 153
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