Janome MC9900 - Backlash Between Hook Drive Gear and Lower Shaft Gear

17
MC 9900
Replacing Printed Circuit Board S2
z Remove the Y-carriage cover (lower) (see pages
6-7).
Remove the setscrew q.
Disconnect the connector and flexible cable from the
printed circuit board S2.
Remove the printed circuit board S2.
To attach, follow the procedure in reverse.
Replacing Y-sensor
•
Removing Y-sensor
z Remove the Y-carriage cover (lower) (see pages
6-7).
Disconnect the connector q from the printed circuit
board S2 w.
x Pry up the lock tab of the connector with a precision
driver and pull out the red e, orange r and brown t.
c Remove the setscrew y.
Remove the Y-sensor.
ert
y
•AttachingY-sensor
z Adjust the Y-sensor height so the shielding plate u
should be positioned at the middle of the sensor i
as illustrated.
Tighten the setscrew y to attach the Y-sensor.
Insert the cords e, r and t to the connector.
Plug the connector to the printed circuit board S2.
x Attach the embroidery unit to the MC9900.
Insert the machine plug into the power inlet.
Insert the power supply plug into the wall outlet and
turn the power switch on.
c The embroidery unit carriage position is initialized.
The range A (between the edge of Y-carriage LM
guide and the edge of carriage) should be 23.1 mm.
If not, turn the setscrew o and adjust the Y-sensor
position.
If the range A is larger than 23.1 mm, move the
Y-sensor set plate in the direction of “B”.
If the range A is smaller than 23.1 mm, move the
Y-sensor set plate in the direction of “C”
i
u
o
q
q
w
23.1 mm
C
B
A