OPTIMOD-FM DIGITAL TECHNICAL DATA
6-13
rameter data (representing information like the settings of various processing con-
trols), and extracts the front panel metering data from the DSP chips.
During system initialization, the SC520 queries the DSP hardware about its opera-
tional status and will display an error message on-screen if the DSP fails to initialize
normally. Please note any such messages and be ready to report them to Orban Cus-
tomer Service.
The DSP chips are located on the I/O+DSP board — see the drawings starting on
page 6-35. IC1202 is a local voltage regulator on the DSP board that derives the
+1.2V core supply for the DSP chips from the +5V Power Supply
.
Power Supply
Warning! Hazardous voltages are present in the power supply when it is connected
to the AC line. Several parts, including the heat sink, are hot to the AC power line.
Except for servicing, do not remove the insulating shield from the power supply.
The power supply is a modular switching supply to minimize heat buildup and
power consumption. It converts an AC line voltage input to +15, –15, and +5 volts.
All other supply voltages are derived from these three voltages via local regulation.
The supply accepts inputs from 85 to 264 VAC, 50 – 60 Hz.
The only fuse in your Optimod is a 2.5A 20mm Quick Acting HBC fuse mounted on
the power supply’s circuit board. Because the supply’s outputs are automatically cur-
rent-limited, the fuse will usually open only if the power supply fails. Be sure to dis-
connect your Optimod from AC power before replacing the fuse!
Because of safety and EMI suppression requirements in the power supply, there are
no user-serviceable parts in it. In case of failure, replace the entire supply with an
Orban-supplied replacement (Orban part number 29270.000.01.1), which ensures
that your Optimod will continue to meet all regulatory requirements for safety and
emissions.
Abbreviations
Some of the abbreviations used in this manual may not be familiar to all readers:
A/D (or A to D) analog-to-digital converter
AES Audio Engineering Society
AGC automatic gain control
A-I analog input
A-O analog output
BAL balanced (refers to an audio connection with two active conductors and one shield sur-
rounding them).
BBC British Broadcasting Corporation
BNC a type of RF connector
CALIB calibrate
CIT composite isolation transformer
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