MS-702 TWO-CHANNEL MAIN STATION
1-9
17. Power Switch: The power switch can be used to turn AC power to the
MS-702 on and off. When in the on position, the front-panel talk buttons
illuminate blue.
20. AC Power Connection: An IEC type 320 connector is provided to interface
to the appropriate AC power cord to be used. The MS-702 will
automatically adjust for the power applied, so there are no manual switches
to set power line voltage or frequency.
Figure 1-4: MS-702 PCB Jumpers
21. Intercom Line Connection: The MS-702 contains three 3-pin male XLR
connectors for each intercom line. These connectors are wired in parallel.
Any single-channel station or channel of a multi-channel station connected
on a line plugged into channel A of the MS-702 will be “party lined” with all
the other stations on that channel. In a multi-channel system, the goal is to
assign specific people to the correct group (i.e. the other people they need to
be in contact with the most). This is particularly important when the
party-line users are on a single-channel beltpack or station, less so if they are
on multi-channel stations. The pinout of the intercom connectors is as
follows:
Pin 1 --- Ground (shield)
Pin 2 --- Power
Pin 3 --- Audio
22. Program Input: A 3-pin XLR female connector provides the main program
input to the station. Program can be fed to the headphone or speaker as well
as to either or both of the intercom channels. The level to the speaker or
headphone is controlled by the program level control. The program
on-off-intrpt switches control whether each intercom channel receives
program audio. The program audio levels on each intercom channel can be
adjusted using the individual program-level trimpots. An option is to feed
program audio to the announce output. This is selected by setting jumper
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