Control Circuits - Orban OPTIMOD 6300 Operating Manual

OPTIMOD 6300 DIGITAL
Warranty
Two Years, Parts and Service: Subject to the limitations set forth in Orban's Standard
Warranty Agreement.
Because engineering improvements are ongoing, specifications are subject to change with-
out notice.
Circuit Description
This section provides a detailed description of user-serviceable circuits used in the
6300. We do not provide detailed descriptions of the digital circuitry because most
of this is built with surface-mount components that cannot be removed or replaced
with typical tools available in the field. Field repair ordinarily consists of swapping
entire PC boards.
The section starts with an overview of the 6300 system, identifying circuit sections
and describing their purpose. Then each user-repairable section is treated in detail
by first giving an overview of the circuits followed by a component-by-component
description.
The drawing on page 6-23 shows circuit board locations.
Overview

The Control Circuits control the DSP, display, and input/output sections of the
6300 system.

The Input Circuits include the connectors and RF filtering for the analog and
digital audio inputs, the digital sync input, and the circuitry to interface these
inputs to the digital processing.

The Output Circuits include the connectors and RF filtering for the analog and
digital audio outputs, and the circuitry to interface the digital processing to
these outputs.

The DSP Circuits implement the bypass, test tone, and audio processing using
digital signal processing.
A block diagram of the DSP signal processing appears on page 6-43.

The Power Supply provides power for all 6300 circuit sections. It is a modular
switching supply and is not user-serviceable.

Control Circuits

The control circuit is based on an AMD Elan SC520 microprocessor, which is a 586-
class processor running an Orban executable program over a third-party real-time
operating system. A flash memory emulates a hard drive. The memory is non-volatile
and does not rely on a battery to retain information when mains power is off.
6-5
TECHNICAL DATA