Pioneer PDP-503CMX Product Training Manual page 30

Digital Video Assembly
The 2 phase 10 bit RGB signal, sync, data and clock lines input the
Digital Video Assembly from the RGB assembly. The signals pass
through the line buffer and into IC1301 and IC1410 (sub-field Data
Generators) where the address data is generated and sent out to the left
section and right section address connectors A-D.
X and Y drive sustain control is preformed by IC1703 and the panel
microcomputer IC1101. The panel microcomputer monitors the
horizontal and vertical drive signals to select the proper refresh rate. The
module microcomputer IC1207 controls the panel microcomputer via
logic lines sent through voltage logic level converters. IC1207 is
controlled by IC5505 the main microcomputer on the RGB board. IC1207
functions also include thermal sensor monitoring, dew detection, reset
control and is used not only to switch on the power supply but to also
switch off the power supply should one of the power down detect lines
activate.
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