Janome MC9900 - Remaining Bobbin Threader Sensor

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Remaining bobbin thread sensor
1. Prepare the empty bobbin (diameter: 8.4 mm) and the
gauge bobbins (diameter: 12.5 mm and diameter:
18.9 mm).
2. Remove the presser foot and needle plate. (see page
4 and 5)
* You may use a fabric to prevent damaging the
needle plate.
3. Turn the power switch ON while pressing the Start/
Stop button and the Reverse stitch button to enter the
factory setting mode.
Press "Bobbin" key.
4. Insert the empty bobbin in the bobbin holder (diameter:
8.4 mm).
5. Rotate the bobbin holder couterclockwise so that the
knob fits to the stopper in the hook race.
6. Press "Key" and read "Key" value.
7. Repeat the procedure 5 to 6 above few times.
Press "Empty" when the same "Key" value is
indicated. This value is memorized as "Empty" value.
8. Repeat the procedure 5 to 7 with the gauge bobbins
(diameter 12.5 mm and 18.9 mm)
When 12.5 mm gauge bobbin is inserted, press "Half"
key to memorize the value.
When 18.9 mm gauge bobbin is inserted, press "Full"
key to memorize the value.
9. Press "OK" key.
Knob
Bobbin
holder
Stopper
Mechanical adjustment
Start/Stop button
Reverse
stitch button
"Key" value
"Empty" value