page 2 – 3
220 / March 2000
I N P U T M O D U L E
Internal Programming Options
Internal programming for the mono mic module is made via printed
circuit board (PCB) mounted jumpers on the module’s MMADC-220
piggyback card.
For the purposes of this manual, we will assume you are holding the re-
moved module upright, component side towards you, with gold-plated card
fingers to the left and the module faceplate to the right. This will enable you to
read the control legends silkscreened next to each programming jumper.
Insert Bypass
Jumper J1(located at the center of the MMADC piggyback card) will
bypass the module’s insert point in and out of the audio signal chain. Note
again that the factory default is “insert bypassed”. In other words, when
shipped from the factory J1 is installed.
Phantom Power
Jumpers J4 and J5 (located on the MMADC piggyback card next to
CT2 connector) turns phantom power on and off for the module’s two
microphone input ports.
J5 activates phantom power for microphone A
J4 activates phantom power for microphone B
Talkback
Typically, one of the 220 console’s input modules will be used for the
control room (CR) console operator’s microphone. The jumper J2 (located
on the middle of the MMADC piggyback card) allows that microphone to
also function as a talkback mic. It places the signal (pre-insert, pre-fader,
pre-on/off) onto the console’s talkback bus. When the console operator
presses a TB switch on the console’s SCD-220 Studio Control module, the
talkback bus (which is carrying his microphone signal) will interrupt the
regular monitor signal being fed to the studio and talent will hear his voice
through the studio monitor speakers.
In order for the studio to reply to the console operator, the IND-220
module controlling the studio’s microphone signal must be routed to the
console’s cue bus, where it can interrupt the regular control room monitor
feed and be heard by the operator. This is accomplished by a user-supplied
TB switch in the studio. The switch provides a momentary closure
between the module’s DB-25 connector “TB to CR A” control pin and
Digital Ground (see page 2-9 for wiring details). As long as this closure is
maintained (i.e., as long as talent holds down the studio TB button) the
module’s (pre-insert, pre-fader, pre-on/off) signal will be placed on the
console’s Cue bus. Simultaneously, the module’s regular output will be
muted (i.e., Cough will be activated) so the talkback signal doesn’t go out
over the air.
Note the factory default
setting for phantom power
is OFF.