Circuit Description; Overview - Orban Optimod-FM 8300 Operating Manual

OPTIMOD-FM DIGITAL
Power
Voltage: 100–132 VAC or 200–264 VAC, switch-selected on the rear panel, 50–60 Hz, 40
VA.
Connector: IEC, EMI-suppressed. Detachable 3-wire power cord supplied.
Grounding: Circuit ground is independent of chassis ground, and can be isolated or con-
nected with a rear panel switch.
Safety Standards: ETL listed to UL standards, CE marked.
Environmental
Operating Temperature: 32 to 122 F / 0 to 50 C for all operating voltage ranges.
Humidity: 0–95% RH, non-condensing.
Dimensions (W x H x D): 19" x 3.5" x 14.25" / 48.3 cm x 8.9 cm x 36.2 cm. Two rack units
high.
Humidity: 0–95% RH, non-condensing.
RFI / EMI: Tested according to Cenelec procedures. FCC Part 15 Class A device.
Shipping Weight: 19 lbs / 8.7 kg
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
8300. 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 8300 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 6-29 shows circuit board locations.

Overview

The Control Circuits control the DSP, display, and input/output sections of the 8300
system.
The Input Circuits include the connectors and RF filtering for the analog and digital
audio inputs, as well as the circuitry to interface these inputs to the digital process-
ing.
6-5
TECHNICAL DATA