Studio Technologies M233-01151 - Manual (Page 17)

Model 233 User Guide Issue 5, November 2014
Studio Technologies, Inc. Page 17
The Model 233’s circuitry establishes
the priority in which the unit draws its
operating power. If an external source
of 24 volt DC power is connected, it will
always serve as the primary source. This
minimizes the impact that the unit’s power
draw could have on a connected intercom
line. If no external source of 24 volt DC
is connected then power will be drawn
from the intercom line. And, of course, no
matter which source is providing power
full operation of the intercom interface can
take place.
Pushbutton Labeling
The three pushbutton switches used in the
Model 233 were selected for several rea-
sons. Foremost was the fact that they are
highly reliable, using gold-plated contacts
for long life in less-than-ideal environ-
ments. A second reason was that apply-
ing customized labels to the button caps
would be very simple. The labels, text
printed on clear material, are placed under
the clear caps on the top of the buttons.
From the factory the left button is labeled
COUGH, the center button is labeled
TALKBACK 1, and the right button is
labeled TALKBACK 2. This was selected
to be appropriate for many on-air applica-
tions in English-speaking locations. But
it’s expected that these may need to be
changed to meet the needs of specific
applications.
As a “head start” for some applications,
a clear sheet with a number of commonly
used button designations printed on it is
included in the shipping carton. These
were created at the factory using a stan-
dard personal computer graphics program
and laser printed onto 3M CG3300 trans-
parency film. The desired button labels
can be cut out with a pair of scissors or an
X-ACTO® knife following the printed guide
lines that indicate the required size.
The clear lens on top of each button cap
can be removed with a fingernail or small
screwdriver. Be certain not to scratch the
button if a screwdriver or other small tool
is used. The clear label can be removed
and replaced. The button cap is then
snapped back into the top of the button
housing using finger-pressure only. No
tool is required to replace the button cap.
If you need to make your own labels the
process is quite simple. Use a personal
computer to create the desired text. The
finished label size should be 0.625-inches
(15.8 mm) square. The completed artwork
can then be printed on transparency film
sheets using a laser or inkjet printer. These
sheets are readily available from most
office supply stores. A pair of scissors or
an X-ACTO knife will complete the task.
Configuration
For the Model 233 to support the needs
of specific applications a number of op-
erating parameters must be configured.
These include microphone preamplifier
gain, phantom power on/off, headphone
source and output mode selection, and
operating modes. One 12-position and
three 8-position DIP switch assemblies
are used to establish the desired con-
figuration. These switch assemblies are
referred to as SW1 through SW4, with
individual switches designated as SW1-1,
SW1-2, etc. The switch assemblies are ac-
cessed through openings in the bottom of
the Model 233’s enclosure. The enclosure
does not have to be disassembled to gain
access to the switches.