Sony BVP-550 Maintenance Manual page 247

(3) Auto system
AT-95 board
The AT-95 board consists of a microcomputer which
controls the camera according to the instructions stored in
a ROM. Operations of the board are listed below;
• Analyzes instructions of the function switches, video
system detection data and analog data.
• Outputs various control signals and compensation
signals to the boards.
• Outputs status information and self-diagnosis infomation
as character data from the character generator.
• Incorporates the interface function with the RM-P9 or
the CCU-700/700P.
(4) Pulse system
SG-234 board
The SG-234 board has a sync signal generator which
generates various sync signals for the camera. The sync
signals are generated from the clock pulse input from the
OHB via the PR-211 board. They are output to the board
of the camera, OHB and the camera adaptor (CA) respec-
tively. This generator has two modes to synchronize with a
reference signal input for external synchronization. One is
a VBS input mode when the camera is used alone and the
other is V RESET/H CONT mode when the CCU is
connected to the camera. Input channels of the V RESET
and H CONT signals differ depending on the type of CA in
connection with the camera.
BVP-550
2-4. Circuit Description
2-5 (E)