Studio Technologies 230 2008 - Manual (Page 44)

Issue 7, October 2008 Model 230 User Guide
Page 44 Studio Technologies, Inc.
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 available
worldwide from sources such as Digi-Key,
website www.digikey.com.
To make the process of connecting to
the Model 230’s headers a simple task
an interface cable kit, part number 31087,
is available from Studio Technologies.
Each kit includes five cable assemblies
and a length of heat-shrinkable tubing.
Each cable assembly consists of a mating
connector with three color-coded wires
attached. These wires, nominally 12 inch-
es in length, allow convenient soldering
to a connector slated to be installed in a
spare location on the Model 230’s back
panel. For reference, the wire color for pin
1 is gray, pin 2 is yellow, and pin 3 is blue.
The heat-shrinkable tubing is provided
so that the connector solder cups can
be insulated from each other. It will also
provide some strain relief to the solder
joints. Be certain to slip the desired length
of tubing over the wire prior to soldering
a connection! (If the writer had a dollar
for every time he forgot to put tubing on
a wire (or slip on a connector shell) before
making a solder connection…)
The Model 230’s enclosure must be
disassembled prior to installing connec-
tors in the spare locations. Four hex-head
machine 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 carefully separated from the chassis,
remaining attached by means of a flexible
cable assembly. This “flex-cable” assem-
bly links the main printed circuit board
assembly with the board assembly that
contains the pushbuttons and LED indica-
tors. Ensure that the flex cable is not
damaged while the Model 230 is being
customized. For easier access, the push-
button/LED board assembly can also be
easily removed.
The 3-position headers on the Model 230’s
main circuit board assembly are located
close to their related input or output con-
nectors. The following list provides the
printed circuit board reference numbers
and associated functions.
For revision levels C or D printed circuit
boards (PCBs):
P3: External 24 volt DC input, pin 1 com-
mon, pin 2 +24 volts, pin 3 not used. Back-
panel 2.1 x 5.5 mm jack has +24 volts on
center pin. Header P12 is used by the back-
panel 24 Vdc jack assembly and is electri-
cally in parallel with P3.
P4: Headphone output, pin 1 common,
pin 2 tip (left), pin 3 ring (right).
P5: Microphone input, pin 1 shield, pin 2
high, pin 3 low. Follows back-panel 3-pin
female XLR pin assignment.
P6: Main output, pin 1 shield, pin 2 high,
pin 3 low. Careful! Back-panel 3-pin male
XLR has pin 1 floating, pin 2 high, pin 3 low.
P7: Line-level talkback output 1, pin 1
shield, pin 2 high, pin 3 low. Careful!
Back-panel 3-pin male XLR has pin 1
floating, pin 2 high, pin 3 low.
P8: Line input 1, pin 1 common, pin 2 high,
pin 3 low.
P9: Line input 2, pin 1 common, pin 2 high,
pin 3 low.
P10: IFB input, pin 1 common, pin 2 DC
with channel 1 audio, pin 3 channel 2 audio.
Follows back-panel 3-pin female XLR pin
assignment.