6-6
TECHNICAL DATA Orban Model 8400
Dimensions (W x H x D): 19” x 5.25” x 16.5” / 48.3 cm x 8.9 cm x 41.9 cm. Depth shown
indicates rack penetration; overall front-to-back depth 18.75” / 47.6 cm. Three rack units
high.
Humidity: 0–95% RH, non-condensing.
RFI / EMI: Tested according to Cenelec procedures.
Shipping Weight: 40 lbs. / 18.1 kg
Warranty
One Year, Parts and Labor: Subject to the limitations set forth in Orban's Standard War-
ranty Agreement.
Specifications are subject to change without notice.
Circuit Description
This section provides a detailed description of user-serviceable circuits used in the 8400.
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 8400 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.
Figure 6-1 on page 6-22 shows circuit board locations.
Overview
The Control Circuits control the DSP, display, and input/output sections of the 8400 sys-
tem.
The Input Circuits include the connectors and RF filtering for the analog and digital au-
dio inputs, the digital sync input, and the circuitry to interface these inputs to the digital
processing. The optional HD inputs use circuitry identical to the main Digital and Sync
inputs. The PC board layout for the HD I/O module is also identical to that of the main
FM I/O module. The only difference is that some parts are not stuffed on the HD board.
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
optional HD outputs use identical circuitry to the main FM output circuitry except that
there is no composite output.
The DSP Circuits implement the bypass, test tone, and audio processing using digital sig-
nal processing.
The Power Supply provides power for all 8400 circuit sections.
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