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.
i Insert the tabs on the needle plate cover into the needle plate, and then slide the cover back on.
c
a
b
a
aCleaning 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 mark on the bobbin case aligns with the mark on the race.
a
b
a
b
• Align the and marks.
c
a mark b mark
c Bobbin case
•Make sure that the indicated points are aligned before installing the bobbin case.
aNeedle 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:
●Be sure that the bobbin case is correctly installed, otherwise the needle may break.
5
Care and Maintenance 177