Casio KX-723C, Service Manual & Parts List

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CAMERA UNIT (CAMERA PCB)
The camera unit is composed a lens, color filter, CCD (IC802), driver (IC800) and signal
processor (IC802). It produces voltages R, B, and G, for the colors red, blue, and green
when light from a scene is focused on the surface. These voltage values vary according
to the intensity of the respective color being scanned.
The camera unit must be replaced with whole unit when it is defective, because the precise
adjustment is required when the individual parts are replaced, and can be done only at our
factory.
2 Color
Filter
Ye,Cy,Gr
color signal
D0 ~ D7
IC800
Driver
VI1~ VI4
VS1 ~ VS4
PHI1~PHI4
PHS1~PHS4
MCK,
HRS2,
FTTRG,
STTRG,
CCODE,
ENDFLG
3
IC802 (CCD)
Sample Hold,
AGC
CCD IN
8bit A/D
Converter
Timing
Generator
4
IC801
CPU
Data Bus
D RAM
1
Lens
Concentrates light rays to a point.
2
Color filter
The striped color filter in front of the CCD detector is used to provide color information.
It has three colors, yellow, green and cyan.
Array of color filter and signal processing (IC801) for camera are extremely close relationship.
Ye G Cy Ye G Cy
Ye G Cy Ye G Cy
Ye G Cy Ye G Cy
Ye G Cy Ye G Cy
Ye G Cy Ye G Cy
Array of color filter
Red
Blue
Green
White
Mg=Blue+Red Ye=Red+Green
Cy=Blue+Green
Mg
Ye
Cy
Three Primary colors
1
Lens
Digital PCB
1 2 3 ~ 506 507 508
Camera PCB
CIRCUIT OPERATIONS