3M C960, Service Information

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Model C960 Headset Intercom System
OperationandDiagrams
1-1
E
3M 2000 May
Introduction
The 3M Model C960 Headset Intercom System is a
wireless intercom system designedfor highreliability,
compactness, and ease of service. It is designed to
provide two-way, radio-frequency audio
communication in quick service drive-through
restaurants and convenience stores.
The system can be programmed to operate on any one
of 16 different channels to provide high-quality audio
performanceandreduce thepossibility ofinterference
between neighboring wireless systems.
System Components
The number of components in a system varies
depending on thesystem configuration. However,the
base station, headset,and batterycharger arecommon
to all system configurations.
Base Station
The wall-mounted base station contains logic and
analog circuits and related system controls, a receiver
to receive signals transmitted from the headsets, and a
transmitter to transmit signals to the headsets.
Headset
The headset is a wireless, battery-powered, two-way
radio used by the operator to communicate with menu
sign customers and with other storepersonnel whoare
wearing headsets. The microphone and earpiece
enable the operator to transmit and receive spoken
communication and alert tones.
The headset canbe programmedto operateon anyone
of 16 different channels to provide high-quality audio
performanceandreduce thepossibility ofinterference
between neighboring wireless systems.
The headset assembly has several field-replaceable
components. These components are detailed in
Section 3 of this manual (Replacement Parts and
Service).
Battery Charger
The battery charger charges headset batteries in
approximately 1.5 to 2 hours. The charger is
available in 3-slot and 6-slot versions.
Each battery charger has two field-replaceable
components:
S
Charger Assembly
S
Transformer Assembly
Speaker and Microphone Assemblies
Standard Systems
The 5-Inch Speaker and Mic Assembly is
recommended for use in standard communication
systems. It consists of a 5-inch, water-resistant,
eight-ohm cone speaker plus a special
weather-resistant dynamic microphone. It also
includes a mounting bracket for easy mounting in
menu signs, speaker posts and other applications.
Using this separate speaker and microphone ensures
maximum sound quality.
Duplex Systems
The 3.5-Inch Duplex Microphone and 5-Inch Duplex
SpeakerAssemblyarerecommendedforuse induplex
communicationsystems. Themicrophone ismounted
on a foam housing, which can be cut to the required
size. The speaker is mounted in a metal housing.
Interconnect Module
This optional module provides a convenient
connection point for equipment such as speakers,
microphones, vehicle detectors, and auxiliary
intercoms.
Cross-Lane Module
This module is a required component for dual-lane
duplex cross-lane communication systems. Itenables
a single headset to operate two base stations.
Vehicle Alert System
The Model C960 is compatible with all 3M vehicle
detectors and those of most other manufacturers.
There are two types of vehicle detectors, classified as
presence detectors or pulse detectors. Presence
detectors (such asmagnetic loopsor SODAR)provide
a signal for as long as a vehicle is present at the
detector. Pulse detectors, such as air hoses, provide
only a momentary signal—signalling vehicle arrival
with no indication of whether or not the vehicle
remains at the detector station.
System Configurations
The system can be configured in one of five ways
depending on the number of menu signs at the facility
and the type of communication desired.