Studio Technologies ISS - Manual (Page 13)

Issue 3, June 1990 ISS User Guide
Page 14 Studio Technologies, Inc.
ISS
Mode Select
One LED and two switches relate to the
Mode Select Card and its’ functions. When
lit, the yellow REMOTE LED indicates that
the ISS bypass/simulate status is being
controlled via remote control, indicating that
the remote manual mode is in effect.
The top switch, SYSTEM MODE, sets the
overall ISS operating mode. In the MANUAL
(down) position, the bypass/simulate status
is controlled by the lower switch. In the
AUTO (middle) position, the Recognition
Card will control the bypass/simulate status,
but a remote control override request is
ignored. In the AUTO + REMOTE (up)
position, the remote control override can
be used.
The lower switch, MANUAL, is active
when the SYSTEM MODE switch is in the
MANUAL (down) position. The MANUAL
switch selects bypass, and simulate from
the left input or simulate from the right input
operation.
Initial Operation
The installation is over and you’re some-
what familiar with the controls; now the fun
can begin as you see what the ISS can do.
You must first connect a source of audio to
the ISS inputs via your patch bay. A good
signal source would be left and right audio
from master control via an audio router; a
better signal would be a great sounding
compact disc run through a line amp to
come up to your required audio level! Do
not use sine waves, or other obscure non-
program type signals in these tests. The
ISS was designed to work with actual pro-
gram material!
A method of monitoring the ISS audio
outputs is also required, such as a set of
high quality audio speakers with an associ-
ated power amplifier. Set up the speakers
so that a good stereo image can be heard;
i.e., don’t put them too far apart—set them
up in a normal listening position. Set the
audio amplifier level controls to the OFF
position. Headphones are also a good
method of monitoring.
1) Check to ensure that audio is indeed
feeding the ISS.
2) Set the following ISS switches: I/O
switch to BYPASS, POLARITY COR-
RECTION switch to DISABLE, SYSTEM
MODE switch to MANUAL, and
MANUAL switch to BYPASS.
3) Push the ISS power switch to the ON
(in) position. The red LED located just
above the power switch should light.
Of the other LEDs, only the green
BYPASS LED on the Crossfade card
should be lit.
4) Raise the level of the audio amplifier
until your left and right test signals are
comfortably heard. You are listening to
the input signals connected directly to
the audio outputs via the Transfer Relay
Assembly.
5) It is a good idea to ensure that at the
start of our tests, audio input and out-
put polarity has been correctly con-
nected. To test this, feed the same
signal into the left and right inputs.
Sum the left and right audio outputs
and listen to the resulting mono signal.
You should not have any cancellation,
as this would indicate a 180 degree
reversal on an audio input or output.