Sony PXW-X500, Service Manual

Page: 12 / 184

1-2. Circuit Description
1-2-1. CCD Block
PA-422
，
PA-423
，
PA-424 Boards
Each of these boards is provided with a power driver (IC001: H driver) that drives the CCD, IC004 and IC005 that
extract and amplify video signals, and a temperature sensor (IC006).
CCD drive pulses from the TG-287 board are input to the power driver IC (IC001: H driver) to drive the CCD. CCD
(IC003) output signals are input to IC004 and IC005 in which video signals are extracted by the correlative double-
sampling and the internal GAIN AMP increases the gain by 0 to 12 dB.
A temperature sensor IC (IC006) is mounted only on the PA-422 board.
TG-287 Board
The TG-287 board outputs CCD drive pulses and CCD output signal sample hold pulses from IC103.
These pulses are synchronized with the HD VD signal input from the DCP-67 board based on the reference 74 MHz
clock, are shaped by IC22 and IC23, and are then output to the PA-422, PA-423, and PA-424 boards.
This board is provided with a V driver circuit (Q216 to Q223) for CCD vertical transfer.
The EEPROM (IC008) stores CCD V sub voltage data and CCD sensitivity adjustment data, and other data.
1-2-2. Camera Block
DCP-67 Board
Analog video signals from the CCD block are output through the connector (CN201) to the DCP-67 board.
The analog video signals are converted to 14-bit digital video (RGB) signals by the A/D converter (IC106, IC107, IC108,
IC115, IC116, and IC117). Then the converted digital RGB signals are output to the camera signal preprocessor IC
(IC300).
This board also mounts an optical filter interface circuit.
In the camera signal preprocessor (IC300), the main-line video signals are transferred through the test signal switching
circuit and the correction circuit for CCD imager, and then white balance and black set processing are added to the video
signals. Odd pixels and even pixels are sorted. The processed video signals are output to the next-stage camera signal
postprocessor and the baseband processor (IC0100: DPR-362 board). This board mounts PROM (IC503) as a peripheral
device of IC300.
1-2-3. Video Signal Block
DPR-362 Board
The video signal processor ROSETTA (IC0100) incorporates the following functions for baseband processing of video
and audio signals.
• Scaler function (supporting multi-format output)
• OSD
• PLL (74 MHz to 148 MHz, etc.)
• CPU
The baseband signals processed by the video signal processor ROSETTA (IC0100) are sent to the video signal distributor
IC and the CN-3558 board, and are then distributed to input/output circuits.
The video signal processor ROSETTA (IC0100) has the following input/output signals.
PXW-X500
1-2