Casio CTK-900 Service Manual page 14

I To replace LED.
Note: Fix the LED (D301, D302, D303, D304, D305, D306) to the PCB according to the height as shown in
the figure below while paying attention to the polarity.
Refer to the illustration on the PCB for the details of the polarity.
D301 D302
D304
Note: Mount LED on the PCB. (solder side).
Correct polarity and height as follows.
Cathode Anode
I To remove the speaker.
18. Remove 8 screws and then two speakers.
Note: Fix speaker cords securely.
D303
D305
I
D301, D302
15.0 ± 0.5 mm
I
D305
12.5 ± 0.5 mm
D306
I
SOLDER SIDE
COMPONENT SIDE
I
SOLDER SIDE
COMPONENT SIDE
— 12 —
D307
D303, D304
14.5 ± 0.5 mm
SOLDER SIDE
COMPONENT SIDE
D306, D307
6.8 ± 0.5 mm
SOLDER SIDE
COMPONENT SIDE