3M C960 Operating and installation instructions

Model C960
Headset Intercom System
Service Information
Food Services Trade Department
3M Center
St. Paul, MN 55144-1000
PrintedinU.S.A.
Copyright E3M IPC. All Rights Reserved.
78-6912-0673-0 Rev C

ModelC960 HeadsetIntercomSystemRevisionHistory
E3M2000 Maya
ThismanualwaspublishedinSeptember,1997 atrevision levelA.
Someportionsofthismanualarealsopublishedseparately.Thepublishingdatesforthefrontmatter,individual
sections,and separately-published documentsare asfollows:
FrontMatter
Cover2000 May......................................................
Revision HistoryPage2000 May..........................................
TableofContents2000 May.............................................
Section1
Operation and Diagrams2000 May........................................
Section2
C960/860 Installation Instructions(78-6912-0672-2)2000 May.................
Section3
ReplacementPartsand Service 2000 May...................................
Section4
Troubleshooting Guide(78-6912-0680-5)2000 May..........................
Analyzing Batteries1997 September............................................
Section5
Operating Instructions(78-6912-0671-4)2000 May...........................
InstallationProcedures:
NoiseReduction Module,ModelA121 (78-6912-0699--5)1999 November.............
NoiseReduction Module,ModelA125 (78--6912--0723--3)2000 March.............
Loop Detector,ModelsA200 and A201 (78--6912--0712--6)2000 April............
AudioGreeter,ModelA300 (78--6912--0717--5)2000 February.....................
DuplexMicrophone/SpeakerAssembly(78-6912-0490-9)1995 August..............
Cross-LaneModule(78-6912-0487-5)1995 March.............................
HeadsetStorageRackKit (78-6912-0508-8)1995 March........................
DuplexMenu Cable(78-6912-0509-6)1995 March............................
3MCommunicationsBar (78-6912-0581-5)1996 July........................
Five-InchSpeakerand MicAssembly(78--8050--8497--3)1996 April..............
3.5-InchDuplexMicrophone(78--6912--0596--3)1996 June....................
5-InchDuplexSpeakerAsembly(78--6912--0530--2)1999 April..................

ModelC960HeadsetIntercomSystemRevisionHistory
bE3M2000 May
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ModelC960 HeadsetIntercomSystemTableofContents
i
E3M2000 May
Section1. Operationand Diagrams
Introduction 1-1...................................................................
SystemComponents1-1.............................................................
BaseStation 1-1................................................................
Headset1-1....................................................................
BatteryCharger1-1..............................................................
Speakerand MicrophoneAssemblies1-1.............................................
InterconnectModule1-1..........................................................
Cross-LaneModule1-1...........................................................
VehicleAlertSystem1-1..........................................................
SystemConfigurations1-1...........................................................
Single-LaneStandardCommunication System1-2......................................
Dual-LaneStandardCommunication System1-2.......................................
Single-LaneDuplexCommunication System1-2.......................................
Dual-LaneDuplexCommunication System1-2........................................
Dual-LaneDuplexCross-LaneCommunication System1-2...............................
Operating Theory 1-2...............................................................
Processing VehicleAlertSignals1-2.................................................
Transmitting and Receiving 1-2.....................................................
Talk/ListenCommunication 1-3....................................................
TalkLockMode1-4.............................................................
PageMode1-4.................................................................
PageMonitorMode1-4...........................................................
Cross-LaneTalk/ListenMode1-4...................................................
MonitorAmplifierand Speaker1-4..................................................
HeadsetComponents1-4............................................................
RechargeableBattery 1-5.........................................................
Headband 1-5..................................................................
MicrophoneBoomAssembly 1-5...................................................
SpeakerAssembly 1-5............................................................
BaseStation 1-6...................................................................
DCPower1-6..................................................................
Talk/PageInput1-6..............................................................
VehicleDetector Input1-6.........................................................
Menu MicInput1-7.............................................................

ModelC960 HeadsetIntercomSystemTableofContents
ii E3M2000 May
BaseStation Configuration Jumpersand Switches1-7...................................
BaseStation and ExternalComponentsDiagram1-8.......................................
InterconnectModule1-11.............................................................
On/Off DC1-11.................................................................
Menu MicrophoneSignalControl1-11................................................
Menu SpeakerAudioControl1-11...................................................
MonitorSpeakerAudioControl1-11.................................................
VehicleDetectorSignalDC1-11.....................................................
InterconnectModuleDiagram1-13......................................................
Section2. InstallationInstructions
Section3. ReplacementPartsand Service
Ordering ReplacementParts3-1.......................................................
TechnicalService 3-1...............................................................
Section1-BaseStation Assemblyand InterconnectModule3-2..............................
Section2-HeadsetAssembly 3-4......................................................
Section3-3-SlotBatteryChargerAssembly 3-6..........................................
Section4-6-SlotBatteryChargerAssembly 3-7..........................................
Replacing theHeadsetSpeaker3-8.....................................................
Replacing theMicBoomAssembly 3-11.................................................
Replacing theBatteryTerminals3-12....................................................
Replacing theBatteryReleaseButton Spring 3-13..........................................
Section4. Troubleshooting
Troubleshooting Guide
Analyzing Batteries4-1..............................................................
DISCHARGE Test4-1............................................................
CYCLE 1Test4-1...............................................................
CYCLE 2,CYCLE 3,and CYCLE 4Tests4-1.........................................
Setup Procedures4-2.............................................................
Initiating aTest4-2..............................................................
Interpreting TestReadings4-2......................................................
ErrorCodes4-2.................................................................

ModelC960 HeadsetIntercomSystemTableofContents
iii
E3M2000 May
Section5. Operating and InstallationInstructions
ModelA121 NoiseReduction Module,78-6912-0699--5
ModelA125 NoiseReduction Module,78--6912--0723--3
ModelsA200 and A201 Loop Detector,78--6912--0712--6
ModelA300 AudioGreeter,78--6912--0717--5
ModelC960 Operating Instructions
Cross-LaneModuleInstallation Instructions,78--6912--0487-5
HeadsetStorageRackInstallation Instructions,78--6912--0508-8
DuplexMenu CableInstallation Instructions,78--6912--0509-6
3MCommunicationsBar Installation Instructions,78--6912--0581-5
FiveInchSpeakerand MicAssemblyInstallation Instructions,78--8050--8497-3
3.5-InchDuplexMicrophoneInstallation Instructions,78--6912--0596-3
5--InchDuplexSpeakerAssembly,78--6912--0530-2

ModelC960 HeadsetIntercomSystemTableofContents
ivE3M2000 May
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ModelC960 HeadsetIntercomSystemOperationandDiagrams
1-1E3M2000 May
Introduction
The3M ModelC960 HeadsetIntercomSystemisa
wirelessintercomsystemdesignedforhighreliability,
compactness,and easeofservice.It isdesignedto
providetwo-way,radio-frequencyaudio
communication in quickservice drive-through
restaurantsand convenience stores.
Thesystemcanbeprogrammedtooperateonanyone
of16differentchannelstoprovidehigh-qualityaudio
performanceandreducethepossibilityofinterference
between neighboring wireless systems.
SystemComponents
Thenumberofcomponentsinasystemvaries
dependingonthesystemconfiguration.However,the
basestation,headset,andbatterychargerarecommon
toall systemconfigurations.
BaseStation
Thewall-mounted basestation containslogic and
analogcircuitsandrelatedsystemcontrols,areceiver
toreceivesignalstransmittedfromtheheadsets,anda
transmittertotransmit signalstotheheadsets.
Headset
Theheadsetisawireless,battery-powered,two-way
radiousedbytheoperatortocommunicatewithmenu
signcustomersandwithotherstorepersonnelwhoare
wearing headsets.Themicrophone and earpiece
enabletheoperatortotransmit and receivespoken
communication and alert tones.
Theheadsetcanbeprogrammedtooperateonanyone
of16differentchannelstoprovidehigh-qualityaudio
performanceandreducethepossibilityofinterference
between neighboring wireless systems.
Theheadsetassembly has severalfield-replaceable
components.These componentsaredetailedin
Section 3 ofthismanual(ReplacementPartsand
Service).
BatteryCharger
Thebatterychargerchargesheadsetbatteriesin
approximately 1.5to 2 hours.The chargeris
availablein 3-slotand 6-slotversions.
Each batterychargerhastwofield-replaceable
components:
SChargerAssembly
STransformerAssembly
Speaker and MicrophoneAssemblies
Standard Systems
The5-InchSpeakerand MicAssemblyis
recommendedforuseinstandardcommunication
systems.Itconsistsofa5-inch,water-resistant,
eight-ohmconespeakerplusaspecial
weather-resistantdynamicmicrophone.Italso
includesamounting bracketforeasymounting in
menu signs,speakerpostsand otherapplications.
Usingthisseparatespeakerand microphoneensures
maximumsound quality.
DuplexSystems
The3.5-InchDuplexMicrophoneand5-InchDuplex
SpeakerAssemblyarerecommendedforuseinduplex
communicationsystems.Themicrophoneismounted
on afoamhousing,whichcanbe cuttotherequired
size.Thespeakerismountedinametalhousing.
InterconnectModule
Thisoptionalmoduleprovidesa convenient
connection pointforequipmentsuchas speakers,
microphones,vehicledetectors,and auxiliary
intercoms.
Cross-Lane Module
Thismoduleisarequiredcomponentfordual-lane
duplexcross-lanecommunicationsystems.Itenables
asingleheadset to operatetwo basestations.
VehicleAlertSystem
TheModelC960 iscompatiblewithall 3Mvehicle
detectorsand thoseofmostothermanufacturers.
Therearetwotypesofvehicledetectors,classifiedas
presence detectorsorpulsedetectors.Presence
detectors(suchasmagneticloopsorSODAR)provide
asignalforaslong asavehicleispresentat the
detector.Pulsedetectors,suchasairhoses,provide
onlyamomentarysignal—signalling vehiclearrival
withnoindication ofwhetherornot thevehicle
remainsat thedetectorstation.
SystemConfigurations
Thesystemcan be configuredin oneof fiveways
dependingonthenumberofmenusignsatthefacility
and thetypeofcommunication desired.

ModelC960HeadsetIntercomSystemOperationand Diagrams
1-2E3M2000 May
Single-LaneStandardCommunication System
This systemprovides standardcommunication
(talk/listen) for facilitiesthathaveonemenusign.It
consistsofonebasestationandoneormoreheadsets
and batterychargers.
Dual-LaneStandardCommunication System
This systemprovides standardcommunication
(talk/listen)forfacilitiesthathavetwomenusigns.It
consistsoftwoindependentsystems-- onededicated
tomenusign 1and theotherdedicatedtomenusign
2.Theheadsetsareprogrammedtoworkwith one
systemortheotherandarelabeledaccordingly(1or
2).
Single-LaneDuplexCommunication System
This systemprovidesduplexcommunication
(simultaneoustalk/listen) for facilitiesthathaveone
menusign.Itconsistsofonebasestationand oneor
moreheadsetsand batterychargers.
Dual-LaneDuplexCommunication System
This systemprovidesduplexcommunication
(simultaneoustalk/listen) for facilitiesthathavetwo
menu signs.Itconsistsoftwo basestationsandtwo
ormoreheadsetsand batterychargers.
Cross-LaneCommunication System
This systemprovidesduplexcommunication
(simultaneoustalk/listen) for facilitiesthathavetwo
menusigns.Itconsistsoftwoduplexsystemsthatare
connectedtoa cross-lanemodule.Theheadsetsare
programmedforeitherlane1 orlane2.
During off-peak hours,the cross-lanemoduleis
turnedontolink thetwosystemsand enableone
operatortotalktocustomersatmenu sign1 ormenu
sign 2 orwith otherheadsetoperators.
Duringpeakhours,thecross-lanemoduleisturnedoff
toseparatethesystems.Withthe cross-lanemodule
off,onesystemisdedicatedtomenu sign1and the
othertomenusign2.Menusign1operatorscantalk
tocustomersatmenu sign 1 orwith otherheadset
operators.Menu sign 2 operatorscantalkto
customersatmenu sign 2 orwith otherheadset
operators.
OperatingTheory
The3M ModelC960 HeadsetIntercomSystemhas
two basicfunctions.First,it processesvehicle alert
signalsthataresuppliedbyahard-wired vehicle
detection system.Second,it transmitsand receives
radiosignalstoprovideoneormoreofthefollowing
typesofaudiocommunication:
STalk/listencommunication
STalklockcommunication
SPage communication
SPagemonitorcommunication
SCross-lanetalk/listencommunication
ProcessingVehicleAlertSignals
TheModelC960 iscompatiblewithall 3Mvehicle
detectorsandthoseofmostothermanufacturers.The
vehicle alertsystemprovidesasignal tothebase
station toindicateacustomerispresentat themenu
sign.
There aretwotypesofvehicledetectors.Presence
detectors (suchasmagneticloopsorSODAR)
provideasignalforaslong asavehicleispresentat
thedetector.Pulsedetectors,suchasairhoses,
provideonlyamomentarysignal—signallingvehicle
arrivalwithnoindication ofwhetherornot the
vehicleremainsat thedetectorstation.
SIfapresencedetectorisused,menusignaudiois
turnedoffautomaticallywhenthevehicleleaves.
SIf apulsedetectorisused,menu sign audiois
silencedbypressingandreleasingaheadsetpage
switch.
Whenavehicledetection signal ispresentedtothe
basestation,thebasestation broadcastsarepeating
alert tonetoall headsets.The alert tone continues
untilthetalkswitch[onanactiveheadset]ispressed.
Transmitting and Receiving
Thetransmitting and receiving functionsare
accomplishedbytwoseparatesetsof radio
transmittersand receivers.Oneset islocatedinthe
headsetand theotherinthebasestation.

ModelC960 HeadsetIntercomSystemOperationandDiagrams
1-3E3M2000 May
Theheadsetreceivesmicrophoneaudiosignalsfrom
thebasestation on frequency Band transmitsboth
audiosignalsandcontrol toneson frequencyA.The
control tonesare abovethe audiblerange,and
functiontoturnthebasestationreceiverONtoenable
reception ofthe audiosignalfromtheheadset
microphone.Becausethecontroltonesareabovethe
audiblerange,audibletonesfromdevices suchas
telephones,pagers,and radioswill not interfere.
Thebasestation transmitson frequency Band
receiveson frequency A.Thereceiverinthebase
station operatesabovethe audiblefrequencyrange.
Whileit receivesthehigh-frequencycontrol tones
fromtheheadset,it isnotaffectedbyaudibletones
fromdevices suchastelephones,pages,andradios.
Thetransmitterinthebasestation isalways
transmitting a “no signal”transmittercarrier,even
whenthereisno microphone audiofromthemenu
sign orheadsetoperatorbeing broadcast.This“no
signal“carrieriscontinuallybroadcasttoandreceived
by all headsetreceivers.Itservestoblock outother
radio-frequencysignalsornoisesfromheadset
receivers.
Similarly,theheadsetreceiverisalwaysONtoenable
thelistenmode.Theheadset transmitterturnsON
onlywhenatalk orpageswitchispressed.
Instandardcommunicationsystems,theoutputfrom
theheadsetreceiverismutedwhentheheadset
transmitterisON.Thisprovides standard
communication (talkorlisten).
In duplexcommunication systems,theoutputfrom
theheadsetreceiverisenabled(notmuted)whenthe
headset transmitterisON.Thisprovidesduplex
communication (simultaneoustalkandlisten).
Thetwosetsoftransmittersand receiverswork
togethertoprovideaudiocommunicationbetweenthe
customeratthemenusign andtheheadsetoperators
insidethedrive-throughrestaurantorbetweentwoor
moreheadsetoperators.
All audiotransmittedbyaheadsetduring talk
operation isheard by:
SMenu sign customers.
SPersonnelwearing activeheadsets.
SPeopleneartheoptionalmonitorspeaker.
All audiofromthemenu sign isheard by:
SPersonnelwearingheadsetsthatareoperatingin
thetalk/listenmode.
SPeopleneartheoptionalmonitorspeaker.
Talk/ListenCommunication
Headset toMenu Sign
Afterthevehicledetection signal ispresentedtothe
basestation,thebasestation broadcastsarepeating
alert tonetoall activeheadsets.
Theheadsetoperatorpressesandholdsthetalkbutton
toacknowledgethe customerat themenu sign and
cancel the alert tone.Whentheheadsetoperator
speaksintothemicrophone,theheadsetgeneratesa
talkcontroltoneandaddsittothemicrophoneaudio.
Themicrophoneaudioandtalkcontroltone arethen
transmittedtothebasestation.Thetalkcontroltone
turnsthebasestation receiverON ,enabling it to
receivethemicrophone audio.
nNote
Thetalkcontrol toneisabovethe audible
frequencyrange,and isusedto prevent thebase
station receiver fromreceivingsignalsfromother
devices(telephones,pagers,etc.)thatmightbeon
thesamefrequency.
Whenthebasestationreceivesthemicrophoneaudio
signal,it re-transmitsit toall headsetreceivers.The
samemicrophone audiosignal isalsoroutedtothe
menu speakeramplifierand themonitorspeaker
amplifier.
Themenu speakeramplifier routesthe amplified
microphoneaudiothroughwiretothemenuspeaker
whereit can beheard bythe customer.Themonitor
speakeramplifier routesthe amplifiedmicrophone
audiothrough wiretoan optionalmonitorspeaker
(typicallylocatedinthekitchenarea)whereitcanbe
heardbyanyoneincloseproximitytothespeaker.
nNote
Themenu sign audioisnot turnedON unlessthe
basestation receivesatalkcontrol tonefromthe
headset.However,thethemonitoramplifieris
alwaysturnedON.