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BEI.ISYSTEM RACTICES

AT&TCoStondord

sEciloN 501-165- l8

lssue, Jonuory1982

73-TYPE TATIONDIATS

IDENTIFICATIONND MAINTENANCE

I . GENERAT

l.Ol This section contains information on the

73A3A,?3BBA, 3C3A, nd 73D3Adials (Fig-

1 and 2) .

Fig. t -73-Type Diol,FrontView

1.O2 Whenever his section s reissued,he reason

fo r reissuewill tre isted n this paragraph.

2. IDENTIFICATION

A.Purpose

2.ol These ialsprovideTOUCH-TONE* ialing n

someDESIGN LINET decorator elephones.

*RegisteredServiceMark of AT&TCo.

fTrademark of AT&TCo.

Fig.2:-73-lype Diol,ReorView

The T3-typedial provides en-buttons or dialing and

two buttons designated and# for specialservices.

B. Ordering

2.O2 Order

o Dial,

o Dial,

o Dial,

o Dial,

NOTICE

Not or useor disclosureutsidehe

Bell System except under written agreement

Guide

as follows:

73A3A(Gold rim)

73B3A Chrome rim)

73CgA Black rim)

73DgA Black rim).

MOUNTINGBRACKETS

Printed n U.S.A. Poge I

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sEcTloN01-165-l8

C. Design eqlures

2.Og The buttonsof the dial are roundandposi-

tioned in a circular pattern' The ?3A3A'

?3BgA, nd?3C3A ialshave healphanumerichar-

acterson thebuttons Fig.1).The73D3A ial hasa

blackdotcentered neach uttonand s designedo

be usedwith an alphanumerieing around he out-

sideof thedial.The?S-tvpe ial hastheapproximate

physieal imensionsf the 8-type otarydial'

2.04 Eaehof thebuttons,whenopert-ted,-Benerates

a dual tone,multifroqueneyDTMF) signal

distinctive o that button.FigureS ndicateshe fre-

ouenciesor eachbutton' Al l buttonsoperate he

.o*.on switchwhich educesidetoneo thereceiv'

er,openshe tranernitter ath,and urneon hesig-naling requencieo,oth he signalingandcommon

swikf, funetionsare providedbv the 6??F Fie' )

hybrid ntegrated ircuit (HIO).

2.05 Thedialcontains polarityguardeliminating

the possibilityof improperoperationdue o

line reversals,

2.oa Thedialprovides ightspade-tippedeads nd

onescrew erminalD for connectiono the

telephoneet.

There are no field adiustments fot

#:,{fI{*?i;rJ;#tl*F*ztt"afffidefective,

3.ot To determinef a dial is defective.(1) Verify wiring for secure nd correctconnec-

tions.

(2) Checkor presencef dial tone' f nodial tone

is heard,make estwith 1013A r equivalent

hand estsetacrossncomingCO ine o telephone

set. f dial one sheard,makenormal estsof tele-

phone etcomponentssdescribedn appropriate

sections.

(3) Breakdial onebydialingadigitasprescribed

by local nstructions' f unable o breakdial

tone, eplaeehe dial'

(4) 0heckall buttons or tone eedbacko the re-

ceiver. f feedbackonesare not present, e-

placedial.

3.02 To testdial frequency ndamplitude utputs'

(1) Dial ocalnumberor testingTOUCH-TONEt

telephoneials,or dial loeal estdeskandre-

questaccesso the dial-testcircuit'

(2) Whensecond ial tone s heard, ial appropri-

atecodeor testing Z-buttondials,dialdigits

1 through9, and hen*, 0, and #.

3.03 Replace ial if it failsto meet he tests'

3. MAINTENANCE

Poge,2

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597H21477H2

770H2 |lzosql I

\ l

\oo

697H21 36H2

6

tss , sEcTroN0t-r65-t8

6971{Z1209H2

770H2 /h1477H2---\.y

851Htz.fI?09H2

{

\ ,0,*1477H2

fA - e41Hz\-/ 120gHZ

fD 6)f roX

/ \/ ( \

BslHz I g+trz1s96Hz | 1ss6Hz

851H21477H2

Fig. 3*Diol Frequenciec

Poge 3

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ELECTR()-STATICSHIELD

L4 GN

L3S

L2scL1 n

H1

,,^ 677F RR

HIC rH3

H4 TC

B

RTG

NC PO

sHrTcH

SOARDASSEI'IBLY

sEcTtoN0r-r65-r8

Poge 4

4 Poges

cR1

Fig. 4-73-Type Diol Schemotic

TOTELSET