Circuit Description - Sony HXC-100 Service Manual

1-3. Circuit Description

Optical System Block (CCD Unit)
PA-353 Board
This board, consisting of a CCD drive H driver and a sample-hold IC, performs correlated double sam-
pling for signals from the CCD and outputs them differentially. The sample-hold IC adjusts sensitivity.
DR-632 Board
This board consists of a CCD V driver circuit and a buffer for CCD and sample-hold IC drive pulses.
TG-265 Board
This board consists of the following circuits.
. A PLD that generates CCD and sample-hold IC drive pulses and a video amplifi er
. A circuit to lock (using PLL) and synchronize the INT PLL H signal generated by the PLD with the
PLL H X and PLL H Y signals sent from the DPR-298 board
The master gain is switched with the step gain in the video amplifi er.
NR-80 Board
This board performs CCD defect correction and black shading, etc.
SE-949 Board
This board detects the ND fi lter disk position.
Signal Processing Block
DPR-298 Board
This board performs main camera signal processing for video signals.
Video signals are digitized by the video amplifi er and the A/D converter, and are transferred to the main
process IC (IC401) through the pre-process PLDs (IC301 to 303) for video signal processing.
The sub-process IC (IC501) and the PLD (IC701) perform video processing for the external interface.
This board also contains a serial digital signal converter IC, an analog video D/A converter, and a refer-
ence clock signal generator.
CD-61 Board
This board encodes the main-line signal and decodes the return signal and the prompter signal.
Main-Line Signal
The main-line signal processed on the DPR-298 board is encoded by the encoder and is transferred to the
OFDM modulation IC. This IC multiplexes the main-line signal and the audio signal and a command sent
from the SY-363 board to a 2-channel signal, D/A-converts the 2-channel signal, and then sends it to the
TX-126 board.
Return Signal
This board receives the OFDM-demodulated stream signal from the TX-126 board, and divides it into a
return video signal, prompter signal, audio signal for intercom, and a command signal.
The return video signal is decoded to a baseband signal by the decoder, and is then sent to the DPR-298
board.
The audio signal and the command are sent to the SY-363 board.
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HXC-100/V1 (E)