Studio Technologies 220 2004 - Manual (Page 34)

Model 220 User Guide Issue 2, August 2004
Studio Technologies, Inc. Page 35
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 220’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 inches in length, allow convenient
soldering to a connector slated to be
installed in a spare location on the Model
220’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 220’s enclosure must be dis-
assembled prior to installing connectors
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 220 is being
customized. For easier access, the push-
button/LED board assembly can also be
easily removed.
The 3-position headers on the Model
220’s main circuit board assembly are lo-
cated close to their related input or output
connectors. The following list provides the
printed circuit board reference numbers
and associated functions:
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: 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: Talkback output 2, 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.
P11: IFB input, pin 1 common, pin 2 DC
with channel 1 audio, pin 3 channel 2 au-
dio. Follows back-panel 3-pin female XLR
pin assignment.
P13: External 24 volt DC input, pin 1
common, pin 2 +24 volts, pin 3 not used.
Back-panel 2.1 x 5.0 mm jack has +24
volts on center pin. Header P12 is used
by the back-panel 24VDC jack assembly
and is electrically in parallel with P13.