Epson PhotoPC600, Руководство по обслуживанию, Страница: 40 / 116

PhotoPC600
Chapter 2 Operating Principles
Rev. A 2-3
CA1 BOARD
The following are the major ICs on the CA1 board. Starting from driving the CCD, they perform
processing and A/D conversion until image data is transformed to the internal system.
Table 2-2. Major Components of the CA1 Board
No. Location Parts Name Function
1 IC903 ICX081AK CCD imager
2 IC902 TC74VHC04 H-Driver, Clock for horizontal data transfer in order to
drive CCD
3 IC904 CXD1267AN V-Driver, Clock for horizontal data transfer in order to
drive CCD
4 IC905 CXA2006Q CDS, AGC circuit
5 IC906 CXD2311AR A/D converter IC for internal system transfer
CA2 BOARD
The Table below shows major circuits on the CA2 board.
Table 2-3. Various Control Circuits of the CA2 Board
No. Circuit Name Function
1 Scan converter This is the circuit that converts CCD output signal to the interlace
signal for TV.
2 Signal Processor
Generic name of No.3
~
No.8 circuits below.
3 Digital clamp This circuit compares the optical black section of the CCD and
image data and makes the black level of the CCD output data
uniform for each line.
4 White balance The circuit controls the white balance by using the AWN judgment
value computed by the CPU to control the gain for each R, G and B
pixel based on the CCD data which has been read.
5
g
This circuit performs correction in order to maintain a linear
relationship between the light input to the camera and the light
output from the picture screen.
6 Color signal
generation This circuit converts CCD signal to RGB signal.
7 Matrix This circuit generates Y, R-Y and B-Y signals from RGB signal.
8 Horizontal
Aperture This circuit generates aperture signal.
9 DRAM controller This circuit controls RAS and CAS and outputs Refresh signal.
10 UART This circuit transfers the image data to PC on the basis of RS-232C.
11 PIO This is the interface circuit for the 4-bit microprocessor on the SY1
board.
12
TG
·
SG
This is the generation circuit which generate the vertical data
transfer clock and electric shutter clock.
13 LCD driver Y/C signal, which is input to this signal, is converted to RGB signal
and synchronized to CLK signal, and is transferred to the LCD.
14 LCD monitor LCD monitor