Circuit Description - Orban OPTIMOD-FM 5500 Operation Manual

OPTIMOD-FM DIGITAL
Voltage: +15 volts maximum. Do not apply negative voltage. When driving a relay or other
inductive load, connect a diode in reverse polarity across the relay coil to protect the
driver transistors from reverse voltage caused by inductive kickback.
Current: 30 mA maximum
Indications: Tally outputs can be programmed to indicate a number of different operational
and fault conditions, including Input: Analog, Input: Digital, Analog Input Silent, AES In-
put Silent, and AES Input Error.
Power
Voltage: 85–264 VAC, 50–60 Hz, 30 VA.
Connector: IEC, EMI-suppressed. Detachable 3-wire power cord supplied.
Fuse: 2.5A 20mm Quick Acting HBC, mounted on the power supply circuit board.
Grounding: In order to meet EMI standards, circuit ground is hard-wired to chassis ground.
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 1.75" x 14.25" / 48.3 cm x 4.5 cm x 36.2 cm. One rack unit
high.
Humidity: 0–95% RH, non-condensing.
RFI/EMI: Tested according to Cenelec procedures. FCC Part 15 Class A device.
Shipping Weight: 10 lbs / 4.6 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
5500. 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 5500 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 6-27 shows circuit board locations.
6-5
TECHNICAL DATA