FujiFilm FinePix A310 AS Скачать руководство пользователя страница 15

Страница: 15 / 74

FinePix A310 Service Manual

3. Schematics

3-3.Functions of Primary Blocks.

3-3-1.Technical Outline

The FinePix A310 incorporates a 1/2.7 inch Fourth Generation Super CCD HR sensor with 3.1 million effective pixels.
An

[xD picture card]

is adopted as the recording media.

New ICs are the [ACS2 (IC102)] for CCD processing, [KEY IC (IC400)] that incorporates power management capabilities into
operation system IC, and system LSI [XCS (IC203)]that packaged signal processing, LCD drive, TG functions and DRAM.
The flash light block is modularized.
The camera is internally capable of discharge function for the rechargable battery (NH-10).
The camera is internally capable of charging the rechargable battery (NH-10) when used with the Picture Cradle CP-FXA10.
The camera incorporated a thermistor to monitor temperature during internal charging the battery(NH-10) for safety.

3-3-2.Functions of Individual Blocks

(1) CCD Signal Processing/Picture-taking Blocks (CCD BLOCK and CAMERA BLOCK)

The analog signals output by the CCD (1/2.7 inch Fourth Generation Super CCD HR sensor with 3.1 million effective pixels
[IC1]) undergo color compensation, adaptive interpolation, amplification (ACG) and signal mixing in the

[ACS2 (IC102)]

CCD

signal processing IC. After that, the signals are converted into 10-bit digital signals and sent to the system LSI

[XCS (IC203)]

This block has a vertical drive IC (IC101) for driving the CCD.

(2) Motor Block (MOTOR BLOCK)

Upon receiving commands from operating switches, the

[XCS (IC203)]

signal processing LSI manages the motor drive IC

(IC651) so as to control the motors for AF, shutter, zoom and iris.

(3) Image Signal Processing Block (PROCESS BLOCK)

Input Data from the CCD
The 10-bit digital image data (equivalent to 1H) output by the image unit (CCD/CAMERA BLOCK) is sent to the system LSI

[XCS

(IC203)]

. It is here converted into 16-bit data by the internal buffer of the LSI, and image data of 2816 x 2120 pix per frame is

temporarily stored in the

[IC202 DRAM (256 Mbit)]

of the LSI.

Also, the 10-bit image data input to this LSI is used for calculations by the [auto calculation unit] and sent to the

[ACS2 (IC102)]

CCD processing IC of the CAMERA BLOCK so as to obtain a suitable AE, AWB and AF.

Recording to the xD picture card
The image data stored in the

[IC202 DRAM (256 Mbit)]

of the system LSI

[XCS (IC203)]

is sent to the signal processing block

one line at a time where it undergoes unpack processing (processing required prior to digital clamping, ( compensation, 10-bit >>
8-bit R/G/B conversion) and YC processing (8-bit digital R/G/B signal >> Y:Cb:Cr = 4:2:2). The 8-bit Y/Cb/Cr data is then sent to
the [internal buffer]. In the

[internal buffer], data is arranged in a format that is easy to convert the 8-bit Y/Cb/Cr data into DCT.

After going through the [JPEG calculation unit] and the [media controller], it is recorded on the xD card.

Play back from the xD picture card
The compressed image data from the xD card is sent to the

[XCS (IC203)]

system LSI as 8-bit image data. It is then sent to the

[media control unit] >> [DMA unit] >> [IC202 DRAM (256 Mbit)] >> [media controller] >> [JPEG calculation unit] >> [signal
processing unit]. The [signal processing unit] does the post-processing of converting the 8-bit Y/Cb/Cr signals into 8-bit R/G/B
signals. At the same time, it weighs the text display signal and displays the text on the LCD UNIT via the [LCD controller].
Camera system adjustment data is stored in the FLASH ROM (IC204).

(4) LCD UNIT

The digital signal sent from the system LSI

[XCS (IC203)]

is sent to the drive IC of the LCD UNIT via the processing unit on the

LCD FPC of the LCD UNIT, where [LCD drive] and [LCD panel tonal control] are performed.

(5) Power Supply Block (DCDC BLOCK)

The power supply block is built around the DC IC (IC301). It generates the below power supplies and supplies them to the
individual blocks.

3.3 V

[XCS (IC203), ACS2 (IC102), V-Drv (IC101), EVR (IC206), FLASH ROM (IC204), STRB IC (IC601),
MOTOR Drv (IC651), KEY IC (IC400), xD Picture Card, MAIN PWB, SUB PWB]

[V-Drv(IC101,MOTOR Drv(IC651)]

EV3

[Key(IC400),MAIN_PWB, SUB_PWB,PSW_PWB]

A3.3V

[XCS (IC203), CLK GEN (IC201), MAIN PWB, LCD]

STRB 5V

[STRB IC (IC601)]

16 V

[CCD (IC1), OFD(IC100),V Drv (IC101)]

-8 V

[CCD (IC1), V Drv (IC101)]

UNREG