Manual

Model 45A User Guide Issue 3, August 2015
Studio Technologies, Inc. Page 11
length of their interconnecting cables. A
final location criterion is to provide access
to the Model 45A’s front panel. An optimal
location will allow convenient use of the
auto null pushbutton and easy observation
of the level meters and status LEDs.
Protecting the Enclosure
The Model 45A is shipped as a self-
contained unit suitable for portable use.
Installed on the bottom of the chassis are
screw-on “bump on” protectors. These
are useful if the unit is going to be placed
on surfaces where scratching of either
the Model 45A or the surface could take
place. They can be removed, without the
use of a tool, when rack-mounting the unit.
Rack Mounting the Model 45A
For permanent or mobile applications it’s
possible to mount one or two Model 45A
units into one space of a 19-inch rack
enclosure or one unit in a special 10.5-
inch rack. Three rack-mount front panels,
purchased separately, are available from
Studio Technologies. Refer to Figure 3 for
a view of the Model 45A in the “1/2-rack”
front panel.
The following provides details on how
to install and use the panels. To attach
a Model 45A unit to either one of the
single-unit rack-mount panels, begin the
process by removing the four 6-32 button-
head screws that hold the cover onto the
chassis. This requires the use of a 5/64-
inch hex wrench. Save the cover, screws,
and lock washers for later use. With the
cover removed, observe the cable and
3-position socket that are part of the 3-pin
male XLR connector assembly that’s at-
tached to the standard front panel. Careful-
ly detach the socket from the 3-pin header,
located on the main printed circuit board
adjacent to the back panel. Remove the 3-
pin male XLR connector from the front pan-
el by removing the two 4-40 Philips-head
machine screws. Save the XLR assembly
and associated screws for later use.
Use the 5/64-inch wrench to remove the
four 6-32 button-head screws that hold the
standard front panel to the chassis. Save
the screws for reuse. Carefully protect and
store the standard front panel for possible
later use. Using the screws that were just
removed, attach the rack-adapter front pan-
el to the Model 45A’s chassis. To prevent
damage extreme care is required when
aligning the front panel with the LEDs, DIP
switch, and auto null pushbutton switch
that protrude through both the Model
45A’s chassis and front panel. Tighten the
four screws only after a careful inspection,
ensuring that all parts protrude through
the front panel without interference. Reat-
tach the 3-pin male XLR assembly to the
Figure 3. Model 45A shown in optional single-unit “1/2-rack” front panel