Studio Technologies 240 - Manual (Page 28)

Issue 1, August 2013 Model 240 User Guide
Page 28 Studio Technologies, Inc.
the factory they contain blank plates that
can be readily removed and replaced with
a variety of XLR or similar-sized connec-
tors. These spare connector locations are
included so that a Model 240 can be cus-
tomized to meet the many specific needs
that arise in broadcast and related audio
applications. Expected uses for these
locations include adding a 6- or 7-pin XLR
connector to allow connection of an “on-
air”-type broadcast headset. (These typi-
cally do not use a 5-pin XLR connector.)
Other uses include creating “loop through”
or “mult” functions associated with the
main output, line input, or intercom inter-
face connections.
The spare connector locations are com-
patible with the Neutrik DL-series of con-
nectors. For flexibility, versions of XLR
connectors are available that provide from
three to seven contacts. For example, a
compatible 3-pin female connector would
be Neutrik part number NC3FD-L-1. To
support some headsets the NC6FDS-L-1
is often used. This is a 6-pin female con-
nector with the unique Switchcraft 6-pin
arrangement. The hardware that secures
the blank plates to the Model 240’s back
panel is also intended to secure the re-
placement connectors. Many other types
of connectors are also available that are
DL-cutout compatible. These include 1/4-
inch jacks, 8-position (“RJ-45”) modular
jacks, and 3-pin screw terminal strips.
The Model 240’s enclosure must be disas-
sembled prior to installing connectors in
the spare locations. Four hex-head ma-
chine screws, two on the bottom front of
the enclosure and two on the back panel,
must be removed. A 5/64-inch hex driver
is required. The cover can then be care-
fully separated from the chassis, remain-
ing attached by means of a flexible cable assembly. This “flex-cable” assembly links
the main printed circuit board assembly
with the board assembly that contains the
pushbuttons and LED indicators. Ensure
that the flex cable is not damaged while
the Model 240 is being customized. For
easier access, the pushbutton/LED board
assembly can also be removed.
If connectors are installed in the Model
240’s spare connector locations adding
labels to those connectors can be helpful.
For a great look it is recommended that
Brother® P-Touch ¼-inch (6 mm) labels be
created. Tape material that prints white text
on a black background works out well for
the Model 240. The Brother label cassette
number TX-3151, white on black, is appro-
priate for use with many of their printers.
Circuit Board “Header”
Connectors
In addition to the four spare connector
locations on the Model 240’s back panel,
provision has been made to allow easy
interconnection with the Model 240’s
printed-circuit-board-mounted input and
output connectors. This was accomplished
by including numerous 3-position male
“header” connectors on the Model 240’s
circuit board. These headers, on 0.1-inch
centers, are wired in parallel with the
Model 240’s connectors. This “no solder”
solution makes customizing a Model 240
a simple process. The headers, located
on the Model 240’s printed circuit board,
are Molex® part number 22-23-2031. They
mate with Molex housing number 22-01-
3037. To make the interconnection, sepa-
rate crimp terminals are attached to loose
wires and then “snapped” into the housing.
Molex part number 08-50-0114 specifies
crimp terminals that are appropriate for
wires of 22 to 30 gauge. These parts are