6-14
TECHNICAL DATA
The guiding principle is that the correction resides in permanent memory
on the control board but it corrects a bug in the DSP board. Therefore, if
you break this pairing in the future (i.e., if either board is replaced for
service), you may have to repeat steps (C) through (E) above. It is wise to
repeat step (B) above if you have replaced either board. (We expect that
all service replacement DSP boards provided by us in the future will not
have the bug.)
Power Supply
Warning!
Hazardous voltages are present in the power supply when it is connected
to the AC line.
h
The power supply converts an AC line voltage input to various power sources used
by the 8600. To ensure lowest possible noise, four linear regulators provide
±
15VDC
and
±
5VDC for the analog circuits. A switching regulator provides high current
+5VDC for the digital circuits. An unregulated voltage feeds local regulators.
The power supply circuits are straightforward and no explanation is required be-
yond the schematic itself. Be aware that C1, C4, C5, and C12 in the switching regula-
tor are premium-quality low-ESR capacitors and must be replaced with equivalent
types to ensure proper operation of the switching supply.
The output of the power supply is monitored by the power-indicator LED circuit,
which causes the power LED to flash according to a preset code to diagnose prob-
lems with the various power supplies in the 8600. See step (2.B) on page 4-9.
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
CMOS
complementary metal-oxide semiconductor
COFDM
Coded Orthogonal Frequency Division Multiplex—a robust type of digital modulation using
many narrow-bandwidth, low data rate, mutually non-interfering carriers to achieve an ag-
gregate high data rate with excellent multipath rejection.
COM
serial data communications port
D/A (or D to A)
digital-to-analog converter
dBm
decibel power measurement. 0 dBm = 1mW applied to a specified load. In audio, the load
is usually 600
Ω
. In this case only, 0 dBm = 0.775V rms.
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