page 3 – 3
D-75 / Sep 2004
STEREO LINE INPUT
Internal Programming Options
With the exception of UTIL pre-fade/pre-on defeat and B follow options
mentioned below, all internal programming is made via PCB mounted dipswitch
SW1 located on the top of the module (beneath the DB-25 connector). Note that
when a dipswitch position is thrown to the right it is ON.
Mutes
An IN-75 module can be programmed to mute speakers when the channel is ON.
The D-75 console has two mute control lines: control room and studio. Each of these
is activated by an A input source.
SW1 position 6 mutes the control room when source A is ON
SW1 position 5 mutes the studio when source A is ON
If the MUTE B setting is made on the PR-75 (see page 10-5) then the mutes will
also function when source B is used.
Tallies
The console has two tallies. The ON-AIR TALLY (see CR-75 chapter) is
activated whenever the control room mute is activated. TALLY 2 (see SC-75
chapter) is activated separately, according to the setting of the dipswitch, by an A
input source.
SW1 position 4 activates tally 2 when source A is ON
If the MUTE B setting is made on the PR-75 (see page 10-5) then the tallies will
also function when source B is used.
Timer Restart
The console’s digital timer can be programmed to automatically reset to zero and
begin counting up when the module’s ON button is pressed.
SW1 position 7 activates timer restart
If the TMR B setting is made on the PR-75 (see page 10-5) then the timer restart
will also function when source B is used.
Talkback
Typically, one of the D-75 console’s input modules will be used for the control
room (CR) console operator’s microphone. The third position of the dipswitch SW1
allows that microphone to also function as a talkback mic. It places the signal (pre-
fader, pre-on/off) onto the console’s talkback bus. When the console operator
presses a TB switch on the console’s SC-75 studio 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.
To accommodate those situations where more than one operator microphone is
used, any number of IN-75 input modules may be assigned to feed the talkback bus.
SW1 position 3 allows the module’s audio to feed the talkback bus
In order for the studio to reply to the console operator, the IN-75 module
controlling the studio’s microphone signal must be routed to the console’s cue bus,
where it can 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” control pin and Digital Ground (see page 3-6 for wiring
?
D-75 / Jan 2008
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