Hkc-T950 - Sony Digital HDVS HDC-900 Maintenance Manual

1-3. Circuit Description

1-3-2. HKC-T950

IF-845 board (CCD block adaptor)
The main line signal (RGB) input from the CCD block is
adjusted in the output level and then sent through the 75 Z
driver to the cable adaptor. The VF VIDEO signal sent
from the cable adaptor is adjusted in the output level and
then output through the 75 Z driver at the VF and BNC
connectors. The IF-845 board also sends/receives the sync
signal required for CCD driving. Moreover, the IF-845
board is provided with the INCOM volume control circuit
and fan control circuit.
AT-146 board (CCD block adaptor)
The AT-146 board consists of the control microcomputer
and its peripheral circuit. The AT-146 board converts the
control signal in the CCD block into the command that can
be sent/received using the cable and sends/receives it to/
from the AT-147 board. Moreover, the AT-146 board
sends/receives the control signals of switches on the
handle, the lens, and VF. This board also controls the fan.
RE-202 board (CCD block adaptor)
The RE-202 board produces the power used in the CCD
block and CCD block adaptor using the UNREG supplied
from the camera and supplies it to each board of the CCD
block and CCD block adaptor.
IF-846 board (Cable adaptor)
The main line signal (RGB) input from the CCD block
adaptor is adjusted in the output level and then sent to the
camera after the cable is compensated according to the
cable length. The VF VIDEO signal sent from the camera
is adjusted in the output level and then output through the
75 Z driver to the CCD block adaptor. The IF-846 board
has the PLL circuit. The phase of the main line signal sent
from the CCD block is automatically adjusted using the
PLL circuit so that it does not vary depending on the cable
length.
1-6 (E)
AT-147 board (Cable adaptor)
The AT-147 board consists of the control microcomputer
and its peripheral circuit. The AT-147 board converts the
control signal in the CCD block into the command that can
be sent/received using the cable and sends/receives it to/
from the AT-146 board. Moreover, the AT-147 board
sends/receives the control signals of the switches on the
handle, lens and VF.
The compensation data for each cable length as well as the
setting data in the CCD block is stored in EEPROM on the
AT-147 board.
HDC-900/950 MM