Model IFB Plus Series Talent Amplifier User Guide

Model 2A User Guide Issue 2, March 2015
Studio Technologies, Inc. Page 27
small hole in the front panel, directly to the
right of the routing control switch. Using
an Xcelite® “greenie” straight-blade screw
driver is recommended. Note that the trim
pot is active only in the receive mode.
Monitor Output
A level control and source select switch is
associated with the monitor output section.
The level control adjusts the output level
sent to the monitor speaker output. IFB
channel 1 is monitored when the source
select switch is in its up position. In its
down position, channel 2 is monitored.
The middle position is labeled OFF and
the monitor amplifier is, as you might
guess, off!
Applying Power
Upon mains power being applied to the
Model 2A the unit will go through a power-
up sequence that will light all of the meter
and status LEDs in a test pattern. Then
the levels meters are used to momentarily
display the version number of the internal
firmware (embedded software that runs
in a microcontroller integrated circuit).
The meter associated with channel 1 will
display the major version number with
a range of 1 to 5 starting at the bottom
LED and moving up. The meter associated
with channel 2 will display the minor
version number, also with a range of 1
to 5. The version number will display for
approximately one second after which
normal operation will commence. At this
stage the power LED on the Model 2A and
any connected Model 32A and/or Model
33A Talent Amplifiers should be lit. If one
or more Model 22 or Model 24 Access
Stations have been connected, their push-
button switches should be dimly lit.
It’s Time to Use the System!
Operation can commence after the Model
2A and related equipment have been
installed and interconnected. Any changes
required to the Model 2A’s internal con-
figuration should have been made, fol-
lowing the information provided in the
Configuration section of this guide. Mains
power should be applied and the power
LED should be lit. Note that the Model 2A’s
power LED also provides an indication of
a second condition. If the talent amplifier
output goes into its fault mode (typically
due to excessive current being drawn) the
power LED will flash on-and-off until the
condition has been corrected.
In the following paragraphs we’ll describe
several scenarios you can use to try out
some of the Model 2A’s features.
Program Inputs, Meters, and Monitor
Output
Connect a high-quality audio source, e.g.,
personal audio device or off-air receiver,
to one of the program inputs. Select this
input as the program audio source for one
of the IFB channels. Set the program level
control of that IFB channel such that the
yellow LED lights on signal peaks. Test
the monitor output by selecting the appro-
priate IFB channel and setting the rotary
level control. You should hear the problem
source and it should let you “rock out”
pretty well. If not, put in a maintenance
request for a better speaker!
Internal Interrupt Microphone
Press the IFB buttons on the left side of
the Model 2A’s front panel to activate the
internal microphone. To prevent possible
acoustical feedback the monitor output
will mute. Using the meters, observe that