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TECHNICAL DATA ORBAN MODEL 8685
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.
Power
Voltage: 100–264 VAC, automatically selected, 50–60 Hz, 75 VA.
Connector: IEC, EMI-suppressed. Detachable 3-wire power cord supplied.
Configuration: Two independent power supplies with independent IEC input connectors.
Power supply health is monitored and the good supply is automatically connected to the
load should one supply fail.
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 5.25” x 15.5” / 48.3 cm x 8.9 cm x 39.4 cm. Depth shown
indicates rack penetration; overall front-to-back depth is 17.75” / 45.1 cm. Three rack
units high.
Humidity: 0–95% RH, non-condensing.
RFI / EMI: Tested according to Cenelec procedures. FCC Part 15 Class A device.
Shipping Weight: 40 lbs. / 18.1 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
8685. 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 optional HD-SDI module is built on a high-speed 10-layer board that is easily
damaged by incorrect rework techniques. Because of the high risk of damage, we do
not recommend servicing the HD-SDI module at the component level.
The section starts with an overview of the 8685 system, identifying circuit sections
and describing their purpose. Then each user-repairable section is treated in detail
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