Bell System Practices Plant Series Instructions de montage

BELLSYSTEMPRACTICES

PlantSeries SECTION502-543-406

Issue1,May1970

AT&TCoStandard

SERVICE

2565LKTELEPHONESETS

1.GENERAL

1.01Thissectionprovidesmaintenanceand

connectioninformationforthe2565LK

telephonesets.Maintenanceinformationwas

formerlyfoundinSection502-525-125.Connection

informationwasformerlyfoundinSection502-525-437

whichisherebycanceled.

2.MAINTENANCE

ReplaceableComponents

2.01Fieldreplaceableitemsarelistedunder

OrderingGuideintheappropriateReference

sectioninDivision502.

Loose Card Retainers

2.02Currentproductionsetsareequippedwith

P-25E803andP-269561cardretainers,which

cannotbeadjusted.

2.03IfP-25E785(MD)cardretainerbecomesso

looseonthefaceplatethatthenumbercard

ordesignationstripslips,theycanbetightened

asfollows:

(1)Removefaceplatefromset.

(2)Removecardretainerfromfaceplate.

(3)Bendthefourarmsoftheretainersothat

morepressurewill beappliedtothenumber

cardanddesignationstrip.Thebendsshould

bemadeapproximately1/2-inchinfromthetabs

ontheendsofthearmsandintheopposite

directionfromthefactorybenttabs.

(4)Installthecardretaineronthefaceplate

andinsertthenumbercardanddesignation

strip.

(5)Installfaceplateontelephoneset.

Note: Ifadjustingthearmsoftheretainer

doesnotresultinsufficientholdingpower,

replacethecardretainer.

Housing

2.04Whenremovingorreplacinghousing,guide

lowerfrontofhousingoverpushbuttons.

Onsetsequippedwithexclusion,pullexclusion

plungeruptoitsoperatedpositionbeforeremoving

housing.Plungershouldalsobeinupperposition

whenreplacinghousing.Withhousinginplace,

operateplungerseveraltimestoinsureproper

operation.

Lamps and Pushbuttons

2.05Replacecrackedpushbuttonsorcollar

assemblies.Plasticpartsmaybecleaned

witha waterdampenedcloth.DONOT USE

SOLVENTS. Lampsshouldbenearassociated

pushbuttonwithcontactsurfacesalignedfor

maximumillumination.

2.06Toreplacedefectivelamp.

(1)Removebuttonandcollarassembly.

(2)GentlyprylampfromsocketwithKS-6320

orangestick.

(3)Replacelamp,makingsurethatcontact

surfaceonlampandsocketmeet.

(4)Replacebuttonandcollarassembly.

Keys—589-Type

2.07Keycontactsmaybecleanedusinga 265C

tool,oradjustedusinga 363tool.When

adjustingsprings:

(a)Thereshouldbea minimumclearanceof

1/64-inchbetweencontactspringsandthose

partsofthekeywhichdonotmakecontact.

(c)AmericanTelephoneandTelegraphCompany.1970

PrintedinU.S.A. Page1

SECTION512-620-100

Fig.1—Typical3-TypeSpeakerphone System,BasicComponents

circuit.Thisavoidsa singingconditionwhile

receiving.

(3)Whenspeechistransmitted,thegainof

thetransmittercircuitincreasestonormal.

Simultaneously,thegainoftheloudspeakercircuit

lowerstoavoidsingingasa resultofthe

increasedtransmittergain.Theamountofthe

gainchangedependsuponthesettingofthe

receivervolumecontrol.Thegainchangeis

smalleratthelower(counterclockwise)settings

andgreateratthehigher(clockwise)settings.

(4)A circuit,referredtoasa switchguard,

utilizesthevoltageacrosstheloudspeaker

toreducethepossibilitythatsurroundingroom

noisewillcausefalseoperationoftheswitching

circuitwhilereceivingspeech.

(5)A predeterminedvoicelevelisnecessaryto

switchfromthereceivingtothetransmitting

condition.Inthepresenceofsteadyroomnoise,

aspecialcircuitautomaticallyraisestherequired

thresholdleveltopreventoperationofthe

switchingcontrolcircuitbythenoise.Talkers

willstillswitchsatisfactorilybecausetheyincrease

theirlevelsundernoisyconditions.

Loudspeakers

2.07External—760A equippedwithR2FKmounting

cord.Consistofpermanentmagnet,dynamic

loudspeakermountedona metalbasewithplastic

housing.

2.08Internal—762A usedwith752-,1752-,and

2752-typepanelsets.Consistsofa P-21F246

speaker,neoprenerubberacousticshield,plastic

cover,and13-inchspade-tippedleads.

Transmitters

2.09External666-typetransmittersconsistsof

anAC1transmitterunit,transistorized

amplifier,etc.The666A(MD)isequippedwitha

T11Amountingcord.The666Bhasa T7Acord.

Page2

ISS5,SECTION512-620-100

2.10 External670Aand671Aareusedinconference

arrangementsof3-typespeakerphone:

670AconsistsofanAC1transmitterunit,

transistorizedamplifier,ON-OFFswitchwith

2-positionONswitchforcontrolofauxiliary

671Atransmitters,volumecontrol,plastic

housing,andT9Amountingcord.

671AconsistsofanAC1transmitterunit

andusedasauxiliarystationinconference

arrangement,encasedina plastichousing;

nocordisprovided.

2.11 InareaswhereR.F.interferenceisa problem,

installa modified666Bor670Atransmitter.

Thesetransmittershavebeenmodifiedbythe

WesternElectricServicecenter.Modifiedunits

areidentifiedbya stamp"MODFORRF"located

nearunitcodestamping.Orderunitsasfollows:

"Transmitter,666Bor670AModifiedperSpecification

X-4200."

2.12Internaltransmittersareallmodular,designed

tobeanintegralpartofthetelephoneset

orconsole.Connectionsaremadethrougha KS-type

connectororreceptacleblockandplugs.Components

aresimilartothoseinexternaltransmitters.

#667B—usedinCALLDIRECTOR®sets

equippedwith590-or650-serieskeys.

#672A—usedin3640and3641CALLDIRECTOR

telephonesets

#673A—usedinnursesconsolein3Ahospital

interphonesystem

0674A—intendedforusein3673A-type

telephoneset

#674B—usein2671-typeCALL-A-MATIC®

telephoneset

0679—usedincurrentproductionCALL

DIRECTORsetsequippedwith635-type

keys.

Power Supply

2.13Powertooperatethe55-typecontrolunits

mustbesuppliedbya 2012Btransformer

(orderedseparately).Duetolowervoltagerating,

a2012Atransformershouldnotbeused.

3.INSTALLATION

3.01Thetelephonesetintendedforusein3-type

speakerphonesystemmustmeetthefollowing

requirements:

(1)Providea setoflineswitchtransfercontacts

todisconnectthespeakerphonewhenthe

handsetislifted.

(2)Rotarydialsetsdialedinanon-hookcondition

mustprovidetwosetsofoff-normal(make)

contactsinthedialforloudspeakerandreceiver

mutingduringdialing.

(3)TOUCH-TONEsetsdialedintheon-hook

conditionmustprovidea setofmakecontacts

(sandt)inthedialcommonswitchtoconnect

linepower(IR)fromthecontrolunittothedial

oscillator.Ifa polarityguardisprovidedthese

contacts(sandt)mustbeisolatedfromthe

oscillatorbythepolarityguard.

3.02Planninganinstallation:

(1)Avoidplacingapparatuswithplasticcovers

orpartsinlocationswhereambienttemperatures

mayexceed140degreesF.

(2)Controlunitchassisispartoftheelectrical

circuitandmustbemountedonaninsulated

surface.

(3)Controlunitcanbelocateda maximumof

100feetfromothersystemcomponents

(transmitter,loudspeaker,etc.)when(Al)leads

areconnectedbetweenboththecontrolunit

andtransmitterandthecontrolunitandthe

telephoneset.

(4)Locatetransformernomorethan100feet

fromcontrolunit.TheACreceptacleshould

notbecontrolledbya switch.

(5)Placeloudspeakerandtransmitterwithin

convenientreachofuserandwithnominal

3feetspacingbetweentheunitsandnotfacing

oneanother.

(6)Thereshouldbenoobstructionsbetween

theuser,loudspeaker,andtransmitter.

(7)Topreventinductiveinterferenceonconference

systeminstallations,usenomorethan30

Page3

SECTION512-620-100

feetofshieldedcablefrommaster670Atransmitter

toauxiliary671Atransmitters.Refertosection

onspeakerphoneconferencesystemforconnections.

(8)Makeconnectionsasshowninappropriate

figuresofthissectionorothersectionsin

Division512forspecifictelephonesetconnections.

3.03The55-typecontrolunitcanbeusedwhere

necessarytocutoffcommonringersor

signalstopreventpickupbyspeakerphone.This

featurecanbeprovidedthroughbreakcontactsof

Klrelayincontrolunit.RefertosectioninDivision

512forspecifictelephonesetinvolved.

D-180196 Kit of Parts

3.04The667Btransmitter,wheninstalledin

certainCALLDIRECTORtelephonesetsis

subjecttopickupofmechanicalspringvibrations

whena heldlinebuttonisreleasedandthe

speakerphonesystemison.Thisvibrationis

transmittedthoughthecontrolunitandbackover

theline.Toeliminatethisconditionthe667B

transmittershouldbereplacedwithonemodified

byWesternElectricservicecenter,orderedas

follows:"Transmitter,667B,ModifiedperD-180196."

3.05Packedwiththemodified667Btransmitter

isa pieceofsplitvinyltubingtobe

assembledtothekeypivotbarspringofthe

telephonesetduringinstallationofthetransmitter.

Note: CALLDIRECTORtelephonesetsmay

beorderedwiththemodificationinstalledby

specifying"ModifiedperD-180196."

4.OPERATION

Note: 3-typespeakerphonesystempermits

normaluseofthetelephonesetfororiginating,

receiving,ortransferringcalls.

4.01Tooriginatea callusingspeakerphone:

(1)DepresstransmitterONbuttonandrelease.

ONlampwillilluminateindicatingspeakerphone

isinthetalkingcondition.Listenfordialtone

transmittedthroughloudspeaker.Telephoneset

handsetisnotlifted(exceptwherehandset

coversdial).

(2)Operatedialoftelephonesetinnormal

manner.

(3)Whencompletenumberisdialed,ringing

tones,busysignals,andcalledpartyanswer

willbeheardfromtheloudspeaker.

(4)Whencalledpartyanswers,transmitterand

loudspeakerareusedtocarryona hands-free

conversation.Adjustvolumelevelasdesired.

Note: Bestoperational resultsareobtained

atthelowestacceptablevolumesettings.

(5)Whenoriginatingcallsfromtelephonesets

whichrequireoff-hookdialing,theON button

mustbedepressedandhelduponcompletionof

dialinguntilthehandsetisrestored.

4.02Toansweranincomingcallusingspeakerphone:

(1)Telephonesetringersignalsanincoming

call.

(2)DepressONbuttonontransmitter.Ringing

istrippedandsystemisautomaticalyconnected

tothelinebythecontrolunit.

4.03Todisabletransmitterwhenitisdesired

nottotransmitconversationintheroomto

adistantparty:

(1)DepressONbuttontofullextentofits

travelandholddownduringentiretime

transmitteristobedisabled.

Note: Withtransmitterdisabledconversation

willnotbetransmittedtothedistantparty,

however,distantpartycanstillbeheardover

theloudspeaker.

(2)Afterprivateconversationiscompletedand

itisdesiredtotransmittodistantparty

again,releaseONbutton.Systemisnowrestored

tofullhands-freecapability.

4.04Toterminatea callonspeakerphone:Depress

OFFbuttonontransmitter.ONlampwill

extinguishandcontrolunitwillberestoredtothe

idlecondition.

4.05Transferringfromhandsettospeakerphone

operation:

(1)Afterdialingorduringa conversationdepress

andholdONbuttonoftransmitter.

Page4

ISS5,SECTION512-620-100

(2)Returnhandsettomounting,andrelease

ONbutton.

(3)Adjustvolumeasrequired.

4.06Transferringfromspeakerphonetohandset

operation.Lifthandsetduringspeakerphone

operationtoautomaticallytransfertohandset

operation.Whenitisnecessarytotransferback

tospeakerphone,referto4.05topreventdisconnect.

Conference Speakerphone Arrangement

4.07The670A(master)transmittermayinitiate

andreceivecallswithorwithoutthe671A

auxiliarytransmittersinthecircuit.Tooperate

withmastertransmitterandauxiliarytransmitters,

turntheONbuttonsothewhitelineisparallel

tothefrontofthetransmitter.Tooperatethe

masterindependently,turntheONbuttonsothe

whitelineisperpendiculartothefrontofthe

transmitter.

4.08Disablingthe670Atransmitteralsodisables

the671Atransmittersiftheauxiliary

transmittersareconnectedtothemastercircuit.

(WhitelineoftheONbuttonisparalleltothe

frontofthetransmitter.)

Tests and Adjustments

5.01Whensystemisinstalledormaintenanceis

performedonanycomponent,makethe

followingtestsofspeakerphoneoperation:

(1)Placea calltothetestdeskandswitchto

speakerphone.

(2)Adjustloudspeakervolumetomoderately

loudlisteninglevelbyturningvolumecontrol

oftransmitterclockwise.

(3)Havetestcenterrepeatthequestion"In

whatsuburbdoesJoelive?"severaltimes.

(4)Ifchoppinessisdetectedinthesentence,

particularyinthefirstb insurburb and

thet inwhat, makeloudspeakeradjustmentper

5.02.

(5)Repeatthistestata highlisteninglevelby

turningthevolumecontroltotheextreme

clockwiseposition.

5.02Analternateloudspeakerconnectionis

providedineach55-typecontrolunitto

compensateforroomconditionswhichcauses

voice-switchingduringreception.Theeffectof

voice-switchingistochopportionsoftheincoming

speech.Tocompensateforthiscondition,move

loudspeakerlead(SP2)fromterminal33toterminal

24[55A(MD)or55A*Modified]orterminal29to

terminal30(55B).

5.03Ifradiofrequencyinterferenceisexperienced:

(1)In666A(MD)transmitter;placeKS-13814L7

(0.02mf)capicatoracrossterminalsofAC1

transmitterunit,and/orplacea 542Ccapacitor

(0.25mf)betweenterminal9 oftheterminal

stripandoneofthemountingscrewsusedto

securetheprintedwiringboardtothebase.

(2)In667A(MD)or667Btransmitter;soldera

KS-13814L7(0.02mf)capacitorforterminal

BtoterminalD oftheprintedwiringboard

assemblyorgroundthetransmitterunitcaseto

thetransmittermountingplate.

5.04Ifvoice-switchingcausedbyexternalaudible

signalingdevicesisencountered:

(1)Placeaudiblesignalingdevicesawayfrom

transmitterunit,ifpossible.

(2)Lowervolumeofaudiblesignalingdevices

tolevelthatwillnotcausevoice-switching

featuretooperate.

(3)Installaudiblesignalcutoffusingthecutoff

featureof55-typecontrolunit.Usethe

leadstocommonsignalcontrolandcommon

ringerorbuzzercircuitforthiscutofffeature.

Cleaning

5.05Cleanplasticcoversandhousingswithwater

dampenedKS-2423clothequivalent.Donot

usescouringpowdersorcleaners.

Page5

SECTION512-620-100

Fig.2—55-TypeControlUnitConnections

Page6

ISS5,SECTION512-620-100

Fig.3—666A(MD)TransmitterConnections

Fig.4—666BTransmitterConnections

Page7

SECTION512-620-100

Page8

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