Studio Technologies 220 2004 - Manual (Page 23)

Issue 2, August 2004 Model 220 User Guide
Page 24 Studio Technologies, Inc.
are provided later in this user guide. The
plate attaches using the four rubber bum-
pers. They should be hand-tightened only;
no tools are to be used.
Operation
At this point the desired input, output,
and power connections should have been
made. The button labels may have been
revised. Finally, the configuration switches
should have been set. Normal operation
of the Model 220 can now begin. The unit
will begin functioning as soon as a power
source is connected. As previously
discussed, the power source can be
provided by an IFB circuit, an external 24
volt DC power source, or both. It’s impor-
tant to highlight the fact that the Model
220 is an active device. Audio signals will
not be present on the outputs if correct
power has not been supplied. Specifically,
the microphone does not passively “cut
through” to the main output connector!
Upon Model 220 power up, the four status
LEDs will light in succession as a firmware
“boot up” indication. The unit will then
begin normal operation. Depending on
the selected configuration, one LED as-
sociated with the status of the main output
may be lit. The user is now presented with
three buttons, four LEDs, and two rotary
controls. These are simple to operate and
understand, as will be described in the fol-
lowing paragraphs.
Pushbutton Switches and
Status LEDs
Three pushbutton switches are used to
control the main and talkback outputs.
The way each operates depends on the
selected configuration. Four LED indica-
tors are located adjacent to the buttons.
They reflect the status of the main and
talkback output functions.
Main Output Button and LED Indicators
The button on the left, factory labeled
as COUGH, functions according to the
selected configuration. Two LED indicators,
located directly above the button, are as-
sociated with the status of the main output.
The green LED, located on the right, is lit
whenever the main output is active. This
could be considered as an “on-air” or
mic active indicator. At the least it should
serve as a “careful what you say” warning!
If the Model 220’s system mode is con-
figured to on-air, the red LED, located on
the left, will be lit when the main output is
muted. This indicates that it’s safe to speak
as one sees fit.
If the Model 220’s system mode is config-
ured to production, the red LED will never
light. This is to reflect the fact that the main
output button has now taken on a func-
tion similar to that of one of the talkback
output buttons. To clarify, when the Model
220 is set to the production mode, the red
LED will never light; the green LED will light
whenever the main output is active.
Main Output Button Modes
• Push to mute: If this mode is selected the
main output is normally active. The main
output will mute whenever the button is
pressed and held.
• Push to talk: If this mode is selected the
main output is normally muted. The main
output will become active whenever the
button is pressed and held.
• Alternate action: If this mode is selected
the main output will alternate between
its active and muted states whenever
the button is pressed. Upon power up
the main output will be in its muted state.