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
