Studio Technologies ISS - Manual (Page 12)

ISS User Guide Issue 3, June 1990
Studio Technologies, Inc. Page 13
ISS
Using the ISS
In this section we will first review the con-
trols and indicator lights on the ISS front
panel. Next we will run some basic tests on
the system and give you a feel for its opera-
tion.
I/O Card
One LED and one switch relate to the I/O
Card and its’ functions. When lit, the green
NORMAL LED indicates that the relays on
the Transfer Relay Assembly, located on the
back panel, are energized and that the
audio input and output signals are con-
nected to the ISS circuitry. When the NOR-
MAL LED is off, the relays on the Transfer
Relay Assembly de-energize, directly con-
necting the left line input to the left line
output, and the right line input to the right
line output. The NORMAL LED will not light
if a valid remote I/O Bypass command is
received, if the I/O switch is in the I/O
BYPASS position, or if a power supply
error is detected. A red LED on the Transfer
Relay Assembly mimics the operation of the
I/O card’s LED. This LED is visible through
an access hole in the back panel.
When the I/O switch is in the I/O BYPASS
(down) position, the Transfer Relay Assem-
bly is held in the I/O Bypass mode, remov-
ing the ISS from the audio path. In the
NORMAL (middle) position, the ISS will be
in the audio path but will ignore a remote
command to go into the I/O Bypass mode.
In the NORMAL + REMOTE (up) position,
a remote command to initiate I/O Bypass
will be executed.
Polarity Correction
Two LED’s and one switch relate to the
Polarity Correction Card and its’ functions.
When the red CORRECTING LED is lit, it
indicates that a polarity reversal has been
detected and is being corrected.
When the yellow REMOTE DISABLED LED
is lit, it indicates that the polarity correction
function is disabled via the remote control
input.
When the switch is in the DISABLE (down)
position, the polarity correction function has
been turned off. This is useful when testing
the ISS or related equipment. In the OPER-
ATE (middle) position, the polarity correc-
tion function is active but the card will
ignore a remote control command to go
into the disable mode. In the OPERATE +
REMOTE (up) position, a remote command
to disable the polarity correction function
will be executed.
System Status
Three LED’s indicate the bypass/simulate
status of the ISS. When the green BYPASS
LED is lit, it indicates that the electronic
crossfade circuitry is routing the input audio
to the audio outputs; the stereo simulators
are not in the audio path. When the red SIM
LEFT LED is lit, it indicates that the left
audio input is being sent to the simulators
and the resulting simulated stereo signal is
being sent to the audio outputs. When the
red SIM RIGHT LED is lit, it indicates that
the right audio input is being sent to the
simulators and the resulting simulated
stereo signal is being sent to the audio
outputs.