Sony BVP-500, Maintenance Manual

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2-5
BVP-500
BVP-500P
TR-90 board
The TR-90 board modulates/demodulates the audio signals
such as the MIC, INCOM and PGM. It also demodulates
the H CONT signal and modulates/demodulates the CHU/
CCU DATA. And it also generates the TONE signal and
modulates it.
AU-215 board
The AU-215 board controls/drives a tally system circuit
and also supplies the power to the MIC CH-1 connector. It
also mixes the TRACKER TALK signal and the intercom
audio and outputs the intercom audio as the TRACKER
RECEIVE.
(6) Video modulation/demodulation system
MD-103 board
The MD-103 board modulates the luminance signal Y, the
color difference signals R-Y and B-Y. And it selects a
signal to be input/output at GENLOCK IN/PROMPT OUT
connector. But, this selection is invalid for this camera and
the S3/MD-103 board does not activate. And also it
quadrature-modulates the Y signal and SKIN GATE signal
with the carrier of 22.5 MHz. The resultant signal is sent
to the CCU.
DM-98 board
The DM-98 board demodulates the RET VIDEO signal
and also selects an output signal. The relationships
between the switch setting and output signal are given in
Section 1-5 “Function of Internal Switches – DM-98
board”.
DM-99 board
The DM-99 board demodulates and amplifies the
PROMPT signal.
2-4. Description of EEPROM Data
The table below gives the holding data of EEPROM on
every printed circuit board.
Board Ref. No. Holding data
VA-163 IC26 VA-163 adjustment data
AT-95 IC46 Triming/Reference files
SG-234 IC21 SG-234 adjustment data
DA-88 IC10 DA-88 adjustment data
IF-538 IC603 IF-538 adjustment data
MB-637 IC5 Model name, Serial number of the unit
n
The IC listed above cannot be replaced because it is the
EEPROM that is holding data inherent in the board. The
part number listed in Section 1 “Spare Parts” of BVP-500/
500P Maintenance manual, Volume 2 is for an EEPROM
which is not programmed. If replacement is needed,
consult your Sony representatives.
2-3. Circuit Description
2-4. Description of EEPROM Data