Circuit Description; Ccd Block (Tg-219 Board, Dr-433 Board, Bi-147 Board, And Pa-253 Board) - Sony HDW-750 Maintenance Manual

1-26. Circuit Description

1-26-1. CCD Block
1-26. Circuit Description
1-26-1. CCD Block (TG-219 Board, DR-433
Board, BI-147 Board, and PA-253
Board)
m
. The circuit description of the CCD block except for a
few board names is common to all models.
. The description uses the board names of the HDW-750
serial No. 10000 series. Read this description with
appropriate board names for other models.
. Refer to "1-1-1. Circuit Configuration and Locations of
the Printed Wiring Boards" for the board used in each
model.
TG-219 board
Among the CCD driving pulses, the horizontal drive pulse
is sent to the BI-147 board through the DR-433 board, and
the sampling pulse that samples the CCD output signal is
output to the PA-253 board. The drive pulses are generated
in synchronism with the H_PHASE that is input from the
DCP-28 board. The respective drive pulses are generated
from the VCO clock signal (X1 : 74.1758 MHz and X2 :
74.25 MHz) on this board. The clock signal for the digital
circuit of this unit is also output via the LVDS driver (IC6).
DR-433 board
Among the CCD driving pulses, the vertical drive pulse is
generated in this board and is converted by IC19 such that
the vertical drive pulse can drive the CCD directly. The
converted pulse is sent to the CCD through the BI-147
board. The drive pulses are output in synchronism with the
H_PHASE and FRM_RST signals that are input from the
DCP-28 board. At the same time, the data such as the V-
sub voltage of the CCD are stored in the EEPROM (IC31)
of the DR-433 board. The DR-433 board has an interface
circuit with the optical filter.
BI-147 board
Among the CCD driving pulses, the horizontal drive pulse
is converted by this board so that it can drive the CCD
directly. The CCD unit is mounted on the BI-147 board to
which the horizontal and vertical drive pulses and the
control voltage are applied to the CCD. The output signal
from the CCD is supplied by the two output signal lines to
which the entire bandwidth of the CCD output signal is
divided into the two signal lines equally. These output
signals are sent to the PA-253 board via source-followers.
1-64
PA-253 board
The two output signals (the bandwidth is half of the original
Hi-vision signal) from the CCD imager that are supplied
from the BI-147 board are sent to the correlation double-
sampling circuit (IC100 and IC101 for R-ch, IC200 and
IC201 for G-ch, IC300 and IC301 for B-ch) where the
video signal is taken out. These two outputs are synthesized
to the original bandwidth of the Hi-vision signal by multi-
plexing them (IC405 for R-ch, IC505 for G-ch, and IC605
for B-ch). The output signal is sent to the DCP-28 board.
HDW-750/750CE V1