AT&T 2870A1 Identification, Installation, Connections, Operation, And Maintenance

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Page 1

BEU SYSTEM PRACTICES AT&TCo Standard

870A 1 AND 2870A1 “TOUCH-A-MATIC*” 32 AUTOMATIC DIALER

IDENTIFICATION, INSTALLATION, CONNECTIONS, OPERATION

AND MAINTENANCE

CONTENTS

1. GENERAL . . . . . . . . . . .

2. IDENTIFICATION . . . . . . . . .

A. Design Features . . . . . . .

B. Optional Features . . . . . . .

c. Ordering Guide . . . . . . .

D. Operating Features . . . . . .

PAGE

SECTION 501-164-201

Issue 5, May 1982

CONTENTS

5.0PERATION . . . . . . . . .

Record a Number Into Memory

B. Change a Number In Memory .

Delete a Number From Memory

Automatically Dial a Number

Memory . . . . . . . .

E. LAST NUMBER DIALED Feature

. . .. .

. .

From

. .

3. INSTALLATION . . . . . . . . . .

STANDARD INSTALLATION . . . . . .

Installation Check Procedure . . .

OPTIONAL APPARATUS INSTALLATION . .

A. D-1 80493 Kit of Parts (Dial Tone Detec-

tor and One-Touch Calling Switch) .

B. D-1 80818 Kit of Parts (Record Disable

and Dial Intermix Feature) . . . .

COMPONENT LOCATION AND ACCESS lN-

FORMATION . . . . . . . . . .

A. Power Supply Board (PSB) Terminals

B. Faceplate Removal . . . . . .

Housing Removal . . . . . . .

4. CONNECTIONS

. . . . . . . . .

F. End-to-End Signaling (2870A 1 Only)

6. MAINTENANCE . . . . . . . . .

Trouble Analysis . . . . . . .

Battery . . . . . . . . . .

Memory . . . . . . . . . .

Dial . . . . . . . . . . .

line Sensing Relay Printed Wiring Board

Assembly . . . . . . . . .

Faceplate (conversion from 870A2 or 2870A2 to 870B1 or 2870B1 ) . .

1, GENERAL

1.01

This section contains information 870A1

(rotary)

and

the

on the 2870A1

(TOUCH-TONEt service) Fig. 1 dials.

*Registered Trademark Company.

of American Telephone and Telegraph

Not for use or disclosure outside the

Bell System except under written agreement

Printed in U.S.A.

tRegistered Service Mark of American Telephone and Telegraph Company.

NOTICE

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SECTION 501-164-201

#Warning:

uses, and can radiate radio frequency

energy and if not installed and used in accordance with the instructions manual, may cause interference to radio communications. It has been tested and found to

comply with the limits for a Class B computing device pursuant to Subpart J of Part 15 of Federal Communications Com-

mission (FCC) Rules, which are designed

to provide reasonable protection against

such interference when opera ted in a

commercial environment. Opera tion of

this equipment in

likely to cause interference

the user at his own expense will be required to take whatever measures may be required to correct the interference.0

This equipment genera tes,

a residential area is

in which case

1.02 The reasons for reissuing this section are

listed below. Revision arrows are used to em-

phasize the more significant changes.

(a) Include electromagnetic interference warning

notice in compliance with the FCC ruling which requires that a warning statement be placed in the user’s documentation for equipment that generates and uses radio frequency energy and may radiate that energy, paragraph 1.01

Remove information on D-180837 Kit of Parts

(b)

(never manufactured)

Change all references to 95B-type power unit

(c)

to 95B1 power unit

Add 87OB2-108, -109 and 287OB2-108. -109

(d)

faceplates.

1.03

These dials are factory-wired as an adjunct dialer to provide manual and automatic rotary

/ FACEPLATE

Page 2

—2870A1 Dial

Fig. 1

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1SS5, SECTION 501-164-201

(870A1 ) or TOUCH-TONE (2870A1) dialing service when interfaced with a multiline or nonmodular tele-

phone set or console. For modular single line application, the 870B1M or 2870B1M dials should be provided.

1.04 These dials are shipped from the factory in the

Ivory (-50) housing only. However, housings

are available in additional colors per paragraph

2.09.

2. IDENTIFICATION

2.o1

These dials provide manual dialing plus auto-

matic dialing of 31 frequently called numbers, and a LAST NUMBER DIALED scratch pad memory.

A. Design Features

2.o2

The following are design features:

●

Integrated circuit memory.

●

Memory buttons from which to select preprogrammed telephone numbers for automatic dialing.

●

Capability to record and automatically dial 31 telephone numbers of up to 15 digits each.

●

Last number manually dialed memory.

● Plug-in battery.

● Capability to pause for subsequent dial tones

during automatic dialing (WAIT input).

B. Optional Features

2.03

The following are optional features.

(a) Decorative Faceplate.

(b) Speakerphone: These dials interface with tele-

phone sets using either 3B (MD) or 4A speak-

erphone systems.

dialer when precise TOUCH-TONE service

dial tone (350 Hz and 440 Hz) is present.

(d) One-Touch Calling Depressing one memory

button will automatically turn on speaker-

phone, detect dial tone, and dial complete number.

Note: All dial tones encountered in the pro-

cess of placing a call must be precise TOUCHTONE service dial tone (350 Hz and 440 Hz) if the call is to be completed automatically.

(e) D-180818 Kit of Parts provides the following

features.

(1) Record Disable Only: Turns off recording

feature to prevent accidental erasures of

$TABLE At

OPTIONS

OPTION

One-Touch Calling *

ADDITIONAL

CONNECT 870A1 PER

ITEMS REQUIRED

B180493 Kit of

CONNECT 2870A1 PER

FIG.

llB, D, E

XG--lB

=“:0’18”t0f

Associated telephone set must be equipped with 3B (MD) or 4A speakerphone system.

t Adjunct diaf must be equipped with an 870B or 2870B Memory when this kit is

provided.

] TABLE I

I I

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SECTION 501-164-201

previously stored numbers. No recording possible except for LAST NUMBER DIALED memory which will store digits dialed manually from adjunct dial.

(2) Record Disable and Dial Intermix: Same as

record disable feature plus.

(a) Allows digits dialed with manual dial

and from memory to be intermixed without having to depress the RECORD OFF button.

(b) Disables the LAST NUMBER DIALED

feature.

2.04 All options are implemented by the following.

● Wiring changes in the applicable dial.

●

Dial, 8EA-119

●

841382880 Line Sensing Printed Wiring Board Assembly

●

Cord, Mounting, D1OU-87

●

Cord, Power, M2SL-87

●

Battery, KS-20390L4

●

Memory, 870B

●

841382617 Power Supply Printed Wiring Board (PSB) Assembly

●

840393672 Directory Sheet Set

●

Booklet, Instruction, Subscriber, SIB-2481B

● Wiring changes in the telephone set or con-

sole to which the dial is an adjunct.

● Installation of appropriate additional items.

Ordering Guide

2.05

Either of these dials maybe ordered complete and ready to install as:

● Dial, 870A1-50 (rotary service)

● Dial, 2870A1-50 (TOUCH-TONE service).

2.06 The following must be ordered separately:

● Unit, Power, 95B1 (required for operation

the automatic dialing feature)

Note: One power unit is required for each

adjunct dial.

● Decorative Faceplate, see paragraph 2.09.

2.07

The 870A1-50 dial may be ordered in its com-

ponent parts as follows:

(a)

Housing, Lower, 870ADJ1-50

Housing, Upper, 870A1U-50

(b)

Faceplate, 870B1-122 (Matte Aluminum)

(c)

2.08

The 2870A1-50 dial may also be ordered in its component parts as follows:

(a)

Housing, Lower, 870ADJ1-50

(b)

Housing, Upper, 870A1U-50

(c)

Faceplate, 2870B1-122 (Matte Aluminum)

(d)

841381965 Dial Base (includes the following):

●

Dial, 35AG3A

841382880 Line Sensing Printed Wiring

●

Board Assembly

●

Cord, Mounting, D1OU-87

●

Cord, Power, M2SL-87

●

Battery, KS-20390L4

●

Memory, 2870B

●

841382385 Power Supply Printed Wiring Board (PSB) Assembly

●

840393672 Directory Sheet Set

●

Booklet, Instruction, Subscriber, SIB-2481B.

2.o9 Optional apparatus (order as required) is as follows:

841382575 Dial Base (includes the following):

(d)

Page 4

● Housing, Lower, 870ADJ1-(see Note 1)

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1SS5, SECTION 501-164-201

Housing, Upper, 870Al U-(see Note 1)

Faceplate, Decorative, 870B1-(see Note 2), 2870B1-(see Note 2) or 870B2-(see Note .2), 2870B2-(see Note 2)

Cord, Mounting, D1OY-W (required when adjunct dial connected to some MET sets and some COM-KEY* key telephone systems)

Kit of Parts, D-180493 (Dial Tone Detector and One-Touch Calling Switch)

Kit of Parts, D-180818 (Record Disable and Dial Intermix) (see Note 3)

Note 1: Color suffix as follows: Black (-03), Green (-51), White (-58), and Light Beige (-60).

Note 2: Color suffix as follows: Teak

Woodgrain (-108) or Walnut Woodgrain (-109). $B2-type is the same as B1-type faceplate except woodgrain runs in the opposite direction. B2-type faceplates are compatible with MET sets and COM KEY 416 key telephone system.q

Note 3: The D-180818 Kit of Parts can only

be used on dials equipped with an 870B or 2870B Memory.

and enables the memory circuits to store telephone numbers.

●

RECORD OFF button (nonlocking), when momentarily depressed extinguishes the RECORD lamp, indicating that the dialer is switched out of the record mode.

●

WAIT button (nonlocking), when momentarily depressed during recording operation,

enters a code into memory to initiate a halt

in the automatic dialing sequence [used where access digit(s) required].

INSTALLATION

STANDARD INSTALLATION

Warning: or power unit until all connections and modifications are completed. Take ex-

treme care not to damage the exposed

components, circuit, etc. when the set is

opened.

3.01

Connect the adjunct dial to the telephone set

Do not plug in either battery

using the D10U~87 or D1OY-5Omounting cord. Refer to Fig. 6 and 7 for basic interface connections and to Tables D through G for specific connections.

Operating Features

O Operating features (Fig. 1) are as follows.

2.1

● Dial.

● 32-button array of low force, low travel

nonlocking memory buttons arranged in three columns. Left and right columns have eleven buttons, center column has ten buttons.

● LAST NUMBER DIALED button located in

lower right corner of memory array, when

momentarily depressed, automatically redials the last number manually dialed from the adjunct dial.

● RECORD button (nonlocking), when momen-

tarily depressed, lights the RECORD lamp

*Registered Trademark of American Telephone and Telegraph Company.

3.02 The dials are shipped from the factory with

the battery disconnected. After all wiring

changes and modifications have been completed, con-

nect the battery by tilting the adjunct dial up and inserting the battery plug into the mating jack.

Note: Write date of battery installation on

label provided.

Danger 1: retaining clamp, if used, to ac outlet using outlet cover screw BEFORE attempting

to install 995B14 power unit. The POwer unit and any other cord plugged into the ac outlet should always be unplugged completely from the outlet BEFORE attempting attach or remove the retaining clamp. This will prevent the possibility y of a loosened retainer clamp or metallic outlet cover making contact with the ac prongs of the power unit when partially

withdrawn from outlet. Do not use retaining clamp on outlets where the cover

For safety, securely attach

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SECTION 501-164-201

mounting screw holds the duplex outlet in the box.

Danger 2: and dress leads connecting to 10w voltage output terminals of495B14 power unit to assure that inadvertent connection to conducting surfaces or other power source does not occur. If more than one power unit is plugged into ceptacle power strip, there must be least one inch separation between power

units. Only UL listed receptacle power strips with adequate power rating shall be used. Use of a continuous terminal power strip that allows the secondary output terminals of the power unit to be in close proximity to the ac line source is not recommended.

Care should be taken to trim

a multiple re-

RECORD LAMP

. . . -—

3.03 Connect the M2SL-87 power cord to the power

unit and plug the power unit into an ac outlet not controlled by a switch (continuous ac power is required).

Note: The power unit must be located no

closer than 1-1/2 feet from the dial in order to

prevent a potential noise condition.

3.o4 Directory sheets (Fig. 2) are held in place

under the faceplate. Additional sheets are available in directory sheet set.

Installation Check Procedure

870A 1 Dial

3.05 Check the 870A1 (rotary service) dial as fol-

lows.

DIRECTORY

‘HEET4

CAPTIVE

HOUSING

SCREW (41 ,

%) .-

.. —-.

.,. --,------

01~,.&lp . . - --

A -.

.. —...-. -—-----—-- ——-—”— -—.-

---- .

Fig. 2—2870A 1 Dial, Faceplate Removed

‘a m-w

.#=’lTl

_.-—.

----

INSTRUCTION LABEL

COVER- WITH

LOWER DETAIL

REMOVED

COYER SCREW

D-18081E3 KIT OF PARTS

(OPTIONAL)

Page 6

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1SS5, SECTION 501-164-201

(1) Check operation of line sensing circuit per the

following tests. (Refer to Part 5 for operation. ) In case of failure, refer to Table H (Trouble Analysis).

(a) With telephone handset on-hook, momen-

tarily depress RECORD button. RECORD

lamp should light.

(b) Lift telephone handset off-hook. RECORD

lamp should be extinguished.

(2) Using the telephone set dial, manually dial a

known number to check that the telephone set

operates correctly.

(3) For the adjunct dial, perform dial speed test

as follows.

(a) Obtain dial tone.

(b) Dial code number for dial speed test.

dial digit O.One of the following audible signals will indicate how the dial meets the requirements of the test.

(1) Audible ringback: dial speed satisfacto-

ry.

(2) Rapidly interrupted dial tone: dial speed

fast.

(3) Slowly interrupted dial tone: dial speed

slow.

(4) With the telephone handset on-hook, use the

dial on the adjunct to record known telephone numbers, storing consecutive digits of the numbers in sequential memory locations. Fill all memory locations except LAST NUMBER DIALED

and the location immediately above it [paragraph

5.01 (4) through (7)].

(5) Automatically dial the telephone numbers

stored in Step (4) by momentarily depressing the memory buttons in the same sequence in which the digits were recorded. Verify that the digits thus dialed produce the expected telephone num-

bers.

ory location immediately above LAST NUMBER DIALED location [paragraph 5.01 (4) through (7)].

(7) Momentarily hang up handset and then auto-

matically dial the number recorded in Step (6).

(8) Go off-hook and from the adjunct, manually

dial a known telephone number.

Note: If a pause for second dial tone is re-

quired, dial the access digit(s). After the RECORD lamp relights, depress the WAIT button then dial the telephone number.

(9) Momentarily hang up handset and then auto-

matically redial the number [dialed in Step (8)] by depressing the LAST NUMBER DIALED button.

Note: The dial should stop dialing if it reaches a stored WAIT input. Depress the LAST NUMBER DIALED button again and the remaining digits should be dialed.

The battery and power unit must be

connected a minim urn of five min-

utes before doing Step (10).

(10) Momentarily disconnect the power unit (for

5 to 10 seconds). After reconnecting power unit, momentarily depress memory buttons in same sequence in which digits were recorded in Step (4). Verify that the correct telephone number is dialed.

(11) Dial the appropriate code for ring-back to

test the telephone set ringer.

(12) If equipped with one-touch calling option, (D-

180493 Kit of Parts and speakerphone), and with set in on-hook condition, depress the memory button used in Step (6). The speakerphone should turn on, dial tone should automatically be detected, and the stored number should be automatically dialed.

2870A1 Dial

3.06 Check the 2870A1 (TOUCH-TONE service)

dial as follows.

(6) Go off-hook and use the dial on the adjunct to

record a known telephone number into mem-

(1) Check operation of the line sensing

the following tests. (Refer to Part 5 for opera-

circuit per

Page 7

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SECTION 501-164-201

tion. ) In case of failure, refer to Table I (Trouble Analysis).

(a) With the telephone handset on-hook, mo-

mentarily depress the RECORD button.

RECORD lamp should light.

(b) Lift telephone handset. RECORD lamp

should be extinguished.

(2) Using the telephone set dial, manually dial a

known number to check that telephone set

operates correctly.

(3) With the telephone handset on-hook, use the

dial on the adjunct to record digits 1 through

O in consecutive memory locations, storing one

digit per memory. Fill all memory locations except LAST NUMBER DIALED and the memory location immediately above it [paragraph 5.01 (4) through (7)].

(4) Lift handset off-hook and record CO dial test

and ringer circuit number into memory location immediately above LAST NUMBER DIALED location [paragraph 5.01 (4) through (7)]. After depressing RECORD OFF button, and when dial test circuit is ready, test dial frequencies by manually dialing digits 1 through O into the test circuit.

(5) Momentarily hang up handset and then auto-

matically redial the test circuit number recorded in Step

(4) by depressing button

immediately above LAST NUMBER DIALED button and proceed as follows:

(a) Depress LAST NUMBER DIALED button.

Digits 1 through O will be automatically

dialed into test circuit. Verify that correct sig-

nal is returned from test circuit.

telephone set dial, manually dial a known num-

ber to check that the telephone set operates correctly.

Note: With ac power removed, the adjunct

dial is inoperative.

(6) Reconnect the power unit, momentarily de-

press the LAST NUMBER DIALED button. Verify that the number dialed is the same as that recorded in Step (4).

(7) If equipped with one-touch calling option (D-

180493 Kit of Parts and speakerphone), and with the telephone set in on-hook condition, depress the memory button previously used in Step (4). The speakerphone should turn on, dial tone should automatically be detected, and the stored number should be automatically dialed.

OPTIONAL APPARATUS INSTALLATION

D-180493 Kit of Parts (Dial Tone Detector and OneTouch Calling Switch)

3.07

Install as follows.

(1)

Remove the housing (paragraph 3.11) and ac-

cess PSB terminal board (paragraph 3.09).

(2)

Insert the dial tone detector board assembly

from the back of the dial, such that the two

tabs on the board assembly fit into the slots in the

chassis (Fig. 3).

(3) Insert the self-threading screw through the

side of the chassis to secure the board in posi-

tion.

(4) Mount the one-touch calling switch below the

dial with the two screws provided.

(b) Momentarily depress the memory buttons

used in Step (3) in the same sequence in which the digits were recorded. Verify that the correct signal is returned from the test circuit.

The battery and power unit must be connected a minim urn of five minutes before doing Step (c).

let. With the handset off-hook and using the

Page 8

Note: If the switch for D-180818 Kit of Parts

is already present, the one-touc!l calling switch cannot be installed. The terminals on the PSB to which the one-touch switch should have been connected (Table B) shall be strapped together. (The one-touch calling option can no longer be disabled by the subscriber. )

(5) Connect per Table B.

(6) Break off the detail at the bottom of the cover

(Fig. 4) and

trim edge as required.

Page 9

1SS5, SECTION 501-164-201

Verify correct operation of option.

(7)

(8) Reassemble.

D-1808 18 Kit of Ports (Record Disable and Dial lnter-

mix Feature)

3.08 Install as follows.

(1) Remove faceplate (paragraph 3.10)

(2) Loosen the captive screw at the bottom of the

cover around the dial and remove the cover

(Fig. 2).

(3) Disengage dial from chassis (paragraph 6.05

or 6.06).

Fig. 3—2870A1 Dial, Dial and Memory Removed to Show Terminal Area

Page 9

Page 10

SECTION 501-164-201

M h$l L

;~s FOR

809!8 KIT

PARTS

= MEMORY

“AI L‘0 R

SWITCHES

Fig. 4—2870A 1 Dial, Internal View

(4) Loosen the four captive Memory mounting

18019;1 Kit of Parts) is already present it shall

screws (Fig. 3). be removed and the PSB terminals to \vhich it

~vas connected (Table B) shall be strapped to-

Rotate the left edge of the Memory upward as

(5)

gether. (The one-touch calling option can no

shown in Fig. 4 longer be disabled by the subscriber. )

Note: If existing memory is 8’70A or 2870A, it

(7)

must be replaced with 870B or 28’70B, respectively. Carefully repack existing memory to en-

Connect switch lead connectors to terminal posts on memory board per T:ihle C.

sure recovery.

(8)

(6) Mount switch below dial with the two scre;vs

pro~’ided,

Note: If the one-touch calling s~vitch (D-

Set FE,ITURE s~vitch to OFF position and v(’rify that ~lia] operates in normal manner.

. .Nomh’rs tan be recorded into memory

Page 10

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1SS5, SECTION 501-164-201

TABLE B

CONNECTIONSFOR DIAL TONE DETECTOR ONLY AND ONE-TOUCH CALLING (NOTE)

APPARATUS

870A1 or 2870A1 Dial Adjunct

D-180493 Kit of

Parts

DESIG COLOR DETECTOR

Strap BK

I StraD I BK

Strap BK 23 Input PB Input DT

Dial ‘K Tone

‘etector

VDD R-O 17 SPR DR Y-o 19

conl

SPO G-Y PL DTT BL-Y 23

Switch S1

+ +

ON 2870A1 DIAL

TERM. FOR

DIAL TONE DETECTOR

ONLYt

—

9 9

LEAD

G-R O-BK

ON 870A1 DIAL

CONNECT TO PSB CONNECT TO PSB

REMOVE

FROM

PSB

1206 I - I * 126 / * I * ]

TERM. FOR

DIAL TONE

ONLYt

ONE-TOUCH

CALLING

* *

2 16

REMOVE

FROM

PsB

295

7 7 G-R 16 16 17 17 o-Y Y-G

Y-BL

BK-O

O-R

s s

20 20

22 22

* *

11 13 17 18 19

19 19

24 29

25 25

26 26 “

* *

ONE-TOUCH

CALLING

33 21 2’7

24 29

28 29

Note: For connection of D1OU-87 or D1OY-5O cord at telephone set end, refer to Tables D through G

* Insulate and store. ~ When dial tone detector only is provided, first dial tone may or may not be precise (350 Hz and 440 Hz) but all sub-

sequent dial tones must be precise.

Switch is required for one-touch calling option only (dial tone detector and speakerphone) and all dial tones must

be precise (350 Hz and 440 Hz).

$ Do not remove from PSB when dial tone detector only is provided.

No telephone numbers can be recorded,

● Numbers can be deleted or changed in memo-

. Numbers can be automatically dialed.

(2)

deleted, or changed in memory.

LAST NUMBER DIALED feature still

(3)

operative.

(9) Set FEATURE switch to ON position and ver-

ify feature provided.

(b) For record disable and dial intermix fea-

tures.

(a) For record disable only feature.

(1) Record lamp will not light when RE-

CORD button is depressed.

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Page 12

SECTION 501-164-201

(2) No

telephone numbers can be recorded,

deleted, or changed in memory.

(3) Manually and automatically dialed digits

may be intermixed. (Depression of RE-

CORD OFF button not required. )

(4) LAST NUMBER DIALED feature dis-

abled.

(10) Reassemble adjunct dial.

COMPONENT LOCATION AND ACCESS INFORMATION

Danger: When it is necessary to access component parts of terminal areas, ac power must be disconnected.

Power Supply Board (PSB) Terminals

3.09

To access the terminal field on the power sup-

ply board, proceed as follows.

(1)

Disconnect power unit from ac outlet.

(2)

Remove the faceplate (paragraph 3.10).

Loosen the captive cover screw at the bottom

(3)

of the cover around the dial (Fig. 2).

Remove the cover.

(4)

Loosen the two captive dial mounting screws.

(5)

Note: On units with metal dial brackets, the

screws will have to be removed.

Page 12

Fig. 5—2870A 1 Dial, Connection of D-180818 Kit of Parts, Record Disable Feature

Only

Page 13

TABLE C

CONNECTIONS FOR D-180818 KIT OF PARTS

1SS5, SECTION 501-164-201

D-KIT

(6) On the 870A1 dial, place the 8-type dial aside

to gain access to some of the PSB terminals. On the 2870A1 dial, carefully disengage the connector of the 35-type dial and rotate the dial onto the memory button field (Fig. 3).

(7) Remove the two mounting screws for the Line

Sensing Relay Board and place the board assembly aside to access the remaining terminals on the PSB.

(8) To reassemble, reverse this procedure.

Faceplate Removal

SWITCH LEADS

DESIG

WDc

VDD RCD BK 3

Notes:

1. There are connectors attached to the switch leads, a single pin connector with a (BK) lead and a double pin connector with a (R) and (BK) lead.

2. When this option is provided, the LAST NUMBER DIALED (LND) feature is disabled and the 32nd memory may be used just as any other memory.

* Insulate and store. ~ Single pin connector.

COLOR

(NOTE l)

BKf’ R 2

TERMINAL POSTS FOR SWITCH

LEAD CONNECTORS

RECORD DISABLE

ONLY

RECORD DISABLE AND DIAL

INTERMIX (NOTE 2)

(b) Remove 870A2

as follows.

(1) For those adjunct dials equipped with a

870A2-87 or 2870A2-87 faceplate, it is held in place by two snaps bonded to the faceplate and aligned to fit holes in the chassis. To re-

move the faceplate, grasp it. by any convenient edge and lift off.

Note: The B1 or $B24 faceplate is not a direct

replacement for the A.2 faceplate described since an 870A1U upper housing is also required

(paragraph 6.08).

1 2 3

or 2870A2 (MD) faceplate

3.10

To remove, proceed as follows.

(a) Remove 870B1, 870B2, 2870B1, or 2870B2 face-

plate as follows.

(1) The B1 ~or B24 faceplate is held in place by

a spring clip attached to the 870A1U upper housing. To disengage the faceplate, lift up on the tab which protrudes from the center of the

back edge of the faceplate.

c. Housing Removal

3.11

To remove, proceed as follows.

(a) Remove lower housing as follows.

(1) Remove the faceplate (paragraph 3.10).

(2) Disengage the captive housing screws (Fig.

2). One is located in each of the four corners

of the chassis.

Page 13

Page 14

SECTION 501-164-201

(3) Separate the housing from the adjunct dial

base while feeding the two cords through

hole in bottom of housing.

(4) Before replacing the housing, lift the ad-

junct to check that the shoulders of the battery jack are against the two chassis tabs. Misalignment may cause the bottom of the housing to bow.

(b) Remove upper housing as follows.

(1) Remove the faceplate (paragraph 3.10).

(2) Disengage the captive housing screws. One

is located in each of the four corners of the upper housing (Fig. 2).

(3) Pull the upper housing away from the chas-

sis as each housing screw is backed out. This will separate the upper housing from the chassis.

Note: If the upper housing is being replaced,

it will be necessary to remove the housing screws.

(4) To reassemble, reverse procedure.

4. CONNECTIONS

4.o1

Typical interface connections for the basic

870A1 and 2870A1 dials are shown in Fig. 6.

4.02 Typical interface connections for the 870A1

and 2870A1 dials to provide the one-touch call-

ing feature are shown in Fig. 7.

4.o3 Connections for the adjunct dial to a selected

variety of telephone sets and consoles may be

found in the following tables:

●

Table D–870A1 Dial Connections to Telephones

●

Table E–2870A1 Dial Connections to Telephones

●

Table F–870A1 Dial Connections to Consoles

4.o5

Adjunct dial connections are shown in Fig. 9 for the 870A1 dial and in Fig. 11 for the

2870A1 dial.

4.06 Partial functional schematics are shown in Fig. 10 for the 870A1 dial and in Fig. 12 for the

2870A1 dial.

OPERATION

A. Record a Number Into Memory

Note: If equipped with the D-180818 Kit of

Parts, switch must be in the OFF position.

5.01 To record, only the dial of the adjunct may be used. Digits manually dialed on the associated

telephone set will not be recorded into memory.

(1) Remove the faceplate (paragraph 3.10).

(2) Write or type the desired name and telephone

number for a selected memory button on the

associated position of the directory sheet.

(3) Replace the directory sheet and faceplate.

(4) Depress the RECORD button. The RECORD

lamp will light. (A number can be called and

recorded simultaneously by lifting handset before depressing the RECORD button.)

(5) Depress the specific memory button adjacent

to the desired telephone number listed on the

directory sheet.

(6) Using the adjunct dial, manually dial the de-

sired telephone number.

Note: If an access code and pause for second

dial tone is required, perform Steps (a) through (c).

(a) Dial the access digit(s).

(b) After the RECORD lamp lights, push the

WAIT button. (The WAIT entry counts as

one digit. )

●

Table G–2870A1 Dial Connections to Consoles.

4.04 Refer to Table A for connection references for all options.

Page 14

telephone number.

Note: A number up to 15 digits in length may

be recorded. The RECORD lamp will go out

Page 15

1SS5, SECTION 501-164-201

momentarily as each digit is dialed. If exactly 15 digits are recorded, the RECORD lamp will go out and stay out, indicating that the dialer has been reset. If a memory button has not been depressed, the RECORD lamp will go out when the first digit is dialed and recording operation

will be voided.

(7) Depress the RECORD OFF button if less than

15 digits are recorded. The RECORD lamp wi!l go out. The dialer will be reset. The number is now stored in the selected memory. The dialer will also be reset by a switchhook or speakerphone operation.

Change a Number In Memory

lVote: If equipped with the D-180818 Kit of Parts, switch must be in the OFF position.

5.02 Whenever a new number is recorded in a pre-

viously used memory position, it will automat-

ically replace the previously stored number.

Delete a Number From Memory

Note: If equipped with the D-180818 Kit of

Parts, switch must be in the OFF position.

equipped with speakerphone, and adjunct dial equipped with dial tone detector), simply depress

the memory button.

LAST NUMBER DIALED Feature

Note: If equipped with the D-180818 Kit of

Parts, and dial intermix feature is provided, switch must be in the OFF position.

5!05

The adjunct dial automatically records into

the LAST NUMBER DIALED position (Fig. any number called using the dial of the adjunct. Each number in the LAST ,NUMBER DIALED position is automatically replaced by the next number manually dialed. Although the unit is recording, the RECORD lamp does not light at any time during this operation.

5.06 Operation of LAST NUMBER DIALED feature is as follows.

(a) If no access digit(s) are required, proceed as

follows

(1) Go off-hook on the telephone set

(2) Listen for dial tone

1 )

5.03

To delete a number, proceed as follows.

Depress the RECORD button.

(1)

(2)

Depress the memory button corresponding to the name and number to be deleted.

(3)

Depress the RECORD OFF button.

D. Automatically Dial a Number From Memory

5.o4

To automatically dial a number, proceed as follows.

(1) Go off-hook on the telephone set, listen for

dial tone, and depress the desired memory button. If WAIT input has been recorded, automatic dialing will stop. When second dial tone is heard, depress memory button again to complete auto-

matic dialing.

(2) If the adjunct dial is equipped with the dial

tone detector only, go off-hook, listen for dial

tone, and depress the memory button.

(3) If the adjunct dial is wired to provide the one-

touch calling feature (telephone set is

(3) Manually dial telephone number using the

adjunct dial

(4) To redial same number automatically, go

off-hook on telephone set, listen for dial tone, and depress LAST NUMBER DIALED button.

(b) If an access code and pause for second dial

tone is required, proceed as follows:

Go off-hook on the telephone set

(1)

Listen for dial tone

(2)

Dial access digit(s) using adjunct dial

(3)

After second dial tone is heard depress

(4)

WAIT button

Manaully dial telephone number using ad-

(5)

junct dial

To redial same number automatically-, go

(6)

off-hook, listen for dial tone, and depress

Page 15

Page 16

SECTION 501-164-201

LAST NUMBER DIALED button. When second dial tone is heard, depress LAST NUMBER DIALED button again to complete automatic dialing.

F. End-to-End Signaling (2870A 1 Only)

s.07

For end-to-end signaling (such as data transmission), the 2870A1 dial has the capability to

intermix manual and automatic dialing.

5.08 If the one-touch calling option is provided, the

initial number must be dialed automatically (even if the one-touch switch is in the OFF position). This allows the dial tone detector to complete its function. Additional numbers may then be dialed automatically or manually if desired.

Standard Operation: If at any time, dig-

(a)

it(s) are keyed manually using the 2870A1 dial, the RECORD OFF button must be depressed before additional digits can be dialed automatically from memory. (The RECORD lamp will not light at any time but depressing the RECORD OFF button will remove the dial from the LAST NUMBER DIALED mode to allow additional automatic dialing. )

(3) Refer to Trouble Analysis Table H (8701

Table I (2870A1).

(4) If removal of adjunct dial is required, pr

as follows.

(a) Disconnect power unit from ac outle

unplug battery.

(b) Disconnect adjunct dial.

Warning: Failure to restrain PIU$ result in plug damage requiring ba replacement t.

slot below battery pack and tape into

B. Battery

6.03

The battery has an expected life of at

years. It can be replaced without loss of: numbers provided that commercial ac power ~ dial is continuously maintained. To replace th tery, proceed as follows:

(1) Tilt the front of the dial adjunct up

9Dial Intermix Mode (with D-180818

(b)

Kit ofParts): 4

Manually and automatically dialed digits may be intermixed as desired when the FEATURE switch is in the ON position.

Note: In this mode, the RECORD button and

the LAST NUMBER DIALED feature are inop-

erative.

6. MAINTENANCE

6.01

In case of power failure, the adjunct dial is inoperative. The battery retains the number

associated with each of the memory buttons for at

least 24 hours. If power loss exceeds 24 hours, the numbers may have to be rerecorded.

A. Trouble Analysis

6.02 When trouble is encountered, the subsequent procedure should be followed.

(1) Confirm improper operation either as a basic

dial or as an automatic dialer (Part 5).

(2) Check connections.

(2) Unplug the battery

(3) Loosen captive screw on the battery SUI

(4) Remove battery support

(5) Remove battery

(6) Install and check new battery (paragraph 3

or 3.06).

C. Memory

6.04 The memory may be replaced in the foil manner.

(1) Disconnect power unit from ac outle

unplug battery.

Note: Removal of the memory or ac an

tery power results in loss of stored numt

(2) Remove the faceplate (paragraph 3.10).

(3) Loosen the four captive memory mol

screws (Fig. 3).

Pcrge 16

Page 17

1SS5, SECTION 501-164-201

Rotate the left edge of the memory upward as

(4)

shown in Fig. 4.

(2) Remove faceplate (paragraph 3.10).

(5) Disengage the connector(s) by pulling them

perpendicular to the printed wiring board.

(3) Loosen the captive screw at bottom of the

cover around the dial and remove the cover.

(6) Replace the memory by engaging the dial con-

nector (2870A1 only) first. The connector(s)

(4) Disengage the two dial mounting screws.

are keyed, one position is filled and should fit over the vacant position in the row of pins. The flat power supply cable should not be twisted.

lVote: On early units, with metal dial brack-

ets, the screws will have to be removed.

(7) Reassemble dial.

(8) Reconnect battery and power unit.

(9) Test per paragraph 3.05 or 3.06 as required.

(10) Reprogram memory (see Part 5).

D. Dial

6.05 Replace rotary dial as follows.

(1) Disconnect power unit from ac outlet and

unplug battery.

Note: Removal of ac and battery power re-

sults in loss of stored numbers.

(2) Remove faceplate (paragraph 3.10).

(3) Loosen the captive screw at bottom of the

cover around the dial and remove the cover.

(4) Remove the two dial mounting screws and set

dial aside.

(5) Disengage the four captive memory mounting

screws (Fig. 3).

(6) Gently raise the memory to a position that

permits access to the dial connector.

(7) Disengage the dial connector by carefully pull-

ing on it perpendicular to the printed wiring

board.

(8) Disengage the second dial connector from the

power supply printed wiring board.

(9) Lift the dial out.

(10) To replace with a new dial, reverse the previ-

ous steps. The connectors are keyed to orient

them relative to the pins. Observe the correct ori-

entation and do not force the connection.

(11) Reconnect battery and power unit.

(12) Reprogram memory, see Part 5.

E. line Sensing Relay Printed Wiring 8oard Assembly

(5) Remove dial leads from terminals on PSB.

(6) Remove dial.

(7) Reverse procedure to replace dial.

(9) Reprogram memory (see Part 5).

6.06 Replace TOUCH-TONE* telephone dial as fol-

lows.

(1) Disconnect power unit from ac outlet and

unplug battery.

Note: Removal of ac and battery power re-

sults in loss of stored numbers.

*Trademark of American Telephone and Telegraph Company.

6.07 RepIace as follows.

(1) Disconnect power unit from ac outlet and

unplug battery.

Note: Removal of ac and battery power re-

sults in the loss of stored numbers.(8) Reconnect battery and power unit.

(2) Remove faceplate (paragraph 3.10).

(3) Loosen the captive screw at the bottom of the

cover around the dial and remove the cover.

(4) Remove the two dial mounting screws (870A1)

or disengage (2870A1).

(5) Place the dial aside to gain access to the PSB

terminals.

Page 17/18

Page 18

1SS5, SECTION 501-164-201

(6) Remove the two mounting screws for the Line

Sensing Relay Board and move the board as-

sembly to one side.

(7) Disconnect the leads of the Line Sensing Relay

Board from associated terminals on the PSB,

and remove the board assembly.

(8) Connect the leads of the replacement Line

Sensing Relay Board to the appropriate terminals on the PSB (Fig. 9B and 9C for the 870A1 dial or Fig. llB and llC for the 2870A1 dial).

(9) Reassemble adjunct dial.

(10) Reconnect battery and power unit.

(11) Reprogram memory, see Part 5.

F. Faceplate (conversion from 870A2 or 2870A2 to

870B1 or 287061)

6.08

Replace an 870A2-87 or 2870.42-87 faceplate

with an 870B1-87 or 2870B1-87 faceplate as

follows.

(1) Remove the A2 faceplate by lifting up on any

of its edges.

(2) Remove the four captive housing screws (Fig.

2) from the chassis.

(3) Use the four housing screws to mount the

870A1U upper housing to the chassis and

870ADJ housing. The three parts should be held

tightly together as the screws are driven.

(4) Place the two tabs located along the lower

edge of the B1 faceplate in the notches in the

lower side of the 870A1U upper housing.

(5) Lower the faceplate to rest on the memory.

The spring clip located in the center of the upper side of the upper housing should retain the faceplate.

Page 19

SECTION 501-164-201

TABLE D

CONNECTIONS FOR 870A1 DIAL TO TELEPHONE SET

TEL SET

LEAD COLOR

565HK,

HKM 564HL , HLM 630DA,

DAM 631DA,

631DAM 634DA, DAM 635DA, DAM 636CA, CAM 637DA, DAM

(2) G

W-BL Net, F W-BL Net. F Spare 1

(2) G

(2) G Net. F Spare 1 830CMT 830CMt 830CM$ 830DMt,+ 830DM$ 831CMt

(2) Gtt 831CM~ 831CM$

831DMt,+,$

(2) Gtt

WI DM!j,!f 832-Type~ 833-Type~ 851B

851BT 851BM

851CM 852A

852AM 870A1M 870A2M 870AI Dial~$

872A1M G

COMMON TIP PATH

REMOVE FROM

G Net. F

CONNECT TO$$

Spare 1

LEAD COLOR

G Net. F Spare 1 G

Net. F

Spare 1 G\$$

Net. F Spare 1 G$$!i

Spare 1

BL-W$$$ 13 Spare 2 BL-W$$$

Gtt

Net. F

8 Spare 1 G G

16 Spare 1

Net. F

8 Spare 1 G

Net. F

Spare 1

8 Spare 1

(2) G

Spare 1

(’2)G Net. F Spare 1

8 Spare 1 G

(2) G

Net. F Spare 1 G

22 Spare 1 R

(2) G Z Spare 1

Net. F

t ***

4ttt

Spare 1

W-BL TB1 8 TB1 15

w-o

TB1 8

26 27

TB1 15

TB1 8 TB1 15 R PSB 9

COMMON RING PATH

REMOVE FROM CONNECT TOqq

G, G-V

9 9

Spare 2 Spare 2

13 Spare 2

13 Spare 2 W-BL 13 Spare 2 W-BL 13 Spare 2

R 6 Spare 2

R R 6 R

R 3 (2) R 6 (2) R

(2) R

6 Spare 2

Spare 2

3 Spare 2

Spare 2

Spare 2 6 Spare 2 6 Spare 2 6 Spare 2 6

Spare 2 4 Spare 2

(2) R

13L-W TB1 4

R TB1 4

o-w 9

4 Spare 2

Spare 2

1 Spare 2

TBI 16 TB1 16

Spare 1

Net. G

Page 20

w-al

Spare t Net. F Spare 1 Net. F

Spare 1

CONNECTIONS FOR 870A1 DIAL TO TELEPHONE SET

STANDARD FUNCTIONS

I T1 ILRIRI

w-o BL-W o-w

9 Spare 2 9 Spare 2

Net. F

TABLE D (Contd)

D1OU-87 CORD (FROM ADJUNCT DIAL)

IMI]M2 I LK I SPO

BR-W W-BR G-w

Net. R Net. GN Net. L1

Net. GN *

Spare 2

Net. R

Net. R Net. GN 4

1SS5, SECTION 501-164-201

SPEAKERPHONE/ONE-TOUCH

W-G

s-w w-s

8 *

‘7 *

Spare 1 Net. F 13 Spare 2

Spare 1 Spare 1 Spare 1 Spare 1 Net. F Spare 1 8 Spare 2 6 Spare 1 16 Spare 1

Spare 1 Spare 1

Spare 1

Spare 1 16 Spare 2 Spare 1 Spare 1 8 Spare 1 Spare 1 22 Spare 1

Spare 1

Net. F Net. F Net. F

Net. F

8 Spare 2

Net. F

8 Spare 2

Net, F

22 Spare 2

Net. F

Spare 2 Spare 2 Spare 2 Spare 2

Spare 2 Spare 2

Spare 2 3

Spare 2

6 Spare 2 6 Spare 2

13 13 13 13

6 6 3

6 6 6

4 4

Net. R Net. GN 4

Net. R Net. R Net. GN Net. R Net. GN *

Net. R

Net. R Net. GN

Net. R Net. GN 29 Net. R Net. GN Net. R Net. GN Net. R Net. GN 29 .Net. R Net. R Net. GN 29 Net. R Net. GN 29 Net. R Net. GN Net. R Net. GN Net. R Net. R Net. GN 29

Net. R

Net. GN

Net, GN *

Net. GN

Net. GN 29

Net. GN

Net. L1

29 29

4 4

See

Fig. 8

14 14 9

* * * *

30 24 30 30 30 24 30 .30 30 24 30 30 24 30 30 24 30

24 24

Spare 1 2*** Spare 2

Spare 1

T13115 TB1 15 ] TB1 8 I TB1 16 I TB1 4 I Net. R I Net. GN I PSB 27 I PSB 21

PSB ’26 PSB 27 PSB 9 Spare 1 TB1 15

.Itt’t

TB1 8

TB1 8 Net. G PSB 9 Net. R

Spare 2

TB1 16

13 Net. R

1 Net. R

TB1 4 Net. R

PSB 1

Net. GN

Net. GN 10

1 I 1

Net. GN

PSB 8

Net. GN PSB 13 PSB 21

\ PSB 27

PSB 13

PSB 21

PSB 3 PSB 6 PSB 3

PSB 6

Page 21

SECTION 501-164-201

TABLE D (Contd)

TEL SET

960A01M” Y/l I-Type** 983-Type**

LEAD COLOR

FOR 870A 1 DIAL TO TELEPHONE

COMMON TIP PATH

I REMOVE FROM I CONNECT TO?+!

PSB-7 I PSB-14

LEAD COLOR REMOVE FROM CONNECT TOqq

R PSB-6 PSB-19

SET

COMMON RING PATH

Remove Shorting Bars

Page 22

TABLE D (Contd)

CONNECTIONS FOR 870A1 DIAL TO TELEPHONE SET

1SS5, SECTION 501-164-201

STANDARD FUNCTIONS SPEAKERPHONE/ONE-TOUCH

LT T1 LR R1 Ml

W-BL w-o BL-W

PsFi-14 PSB-7 PSB-19 PSB-6

D 10U-87 CORD (FROM ADJUNCT DIAL)

M2 LK

o-w

BR-W W-BR G-W

PSB-8 PSB-20 *

Plug D1OYcord into set

SPO

W-G

* Insulate and store.

t Manufactured after 2-77 with new line switch (new line switch is identified by two additional blue leads)

+ Manufactured prior to 2-77 with new line switch. $ Manufactured prior to 2-77 with old line switch (old line switch has no blue leads).

~ (hly CCIlines can be dialed from adjunct dial (no intercom lines).

‘“ Replace the D1O[J-87 cord in the 870A1 dial with a D1OY-5Ocord, observing same color code.

tt From line key.

~+ Each adjunct dial adds 1 db loss to the loop. 20 ma loop current is required for proper operation of unit. $$ Spare “1s” use same spare terminal or D-161488 connector in telephone set.

~~ Spare ‘2s” use same spare terminal or D-161488 connector in telephone set.

*** Network F when using 4A speakerphone. ttt Common tip lead from line key. Located On terminal ~ in ~~~AM sets manufactured before 3-4-77

~4~ Connect to same terminals as P3 and P4 leads from 4A speakerphone.

!N!j [f speakerphone is provided, speakerphone lead designated R1 must also be moved from 13 to spare 2.

s-w

* *

P3 P4

w-s

Page 23

SECTION 501-164-201

TABLE E

TEL SET

LEAD COLOR

2565HK, 2565HKM

‘2630DA 2630DAM

2631DA,

2631DAM 2634DA

2634DAM 2635DA

2635DAM 2636CA, CAM 2637DA, DAM 2830CM-I’ 2830CM$

Gtt

G$$

G**

W-BL

G*+ Gt+

Gtt

Gtt 2830CM$ Gtt 2WODMt,~ Gtt 2830DM$ Gtt 2831cMt 2831CM$

2831CM!

(2) Gtt

(~) Gtt

(21 Gtt 2KHDMt,+,~ (2) Gtt 2WlDM!,!l

(2) Gtt 2XV2-Type~ 2833 -Type~ (2) (;

2851B, 2x51BT,

2s51 B\l

2X.51(‘M

X+52A. 2-WA .M

2x7{).’i 1M

H- III,

2S70A2M X70A 1

I)ial$$ AW2A1.M,

~~~~:\~}l

w-()

X](;OAOI”y !:)xl -Type”*

?!M3-Typr**

CONNECTIONS

COMMON TIP PATH

REMOVE FROM

Net. L2

Net. L2 Spare 1

12 Spare 1 12 Spare 1

G 22

r2 Spare 1 (2) R

(;

2ottt

2$$+

1$$$

TB1 8

(;

TB1 x

PSB-2

(;

TBI 8

PSB-7

FOR 2870Al DIAL TO TELEPHONE SET

CONNECT TO~!! LEAD COLOR

Spare 1 G, G-V 9

Spare 1

Spare 1 Spare 1

Spare 1 8 Spare 1 8

Spare 1 8 Spare 1

Spare 1 (2) R 8

Spare 1

8 Spare 1 (2) R

Spare 1

Spare 1 R

Spare 1

TB1 11 BL-W TB1 4 TB1 11

Net, G

TB1-15

PSB-14

Remove Shorting Bars

G~~~ 13

G~~~

BL-W~$fi

BL-W~yy

BL-W 9 BL-W 9

R 6 R R R R

(2) R

(2) R (2) R

R TB1 4

o-w

COMMON RING PATH

REMOVE FROM

CONNECT TO***

6 6 3 3 6 6 6 3 Spare 2 3 4 Spare 2 4 Spare 2

PSB-11 Net. L1

PSB-12

PSB-6

Spare 2

Spare 2 Spare 2 Spare 2 Spare 2 Spare 2 Spare 2 Spare 2 Spare 2 Spare 2

Spare 2

TB1 1’2 TB1 12

Net. G

PSB-19

Page 24

LT 11

w-w w-o

TABLE E (Contd)

CONNECTIONS FOR 2870A 1 DIAL TO TELEPHONE SET

D1OU-87 CORD (FROM ADJUNCT DIAL)

STANDARD FUNCTIONS

BL-W o-w BR-W

R1 Al

AG LK SPO

W-BR G-W W-G

1SS5, SECTION 501-164-201

SPEAKERPHONE/ONE-TOUCH

s-w

SPARE

w-s

Spare 1

Spare 1 Spare 1

Spare 1

Spare 1 Spare 1 Spare 1 Spare 1 Spare 1

Spare 1 Spare 1

Net. L2

Spare 1 13

Spare 1

Net. L2 Spare 2

Net. L2 Spare 2 13

Spare 1 Spare 1

8 8 8 3 8

8 Spare 2 3 22 22

l==

Spare 1

t---G=-

9 Spare 2

Spare 2

9 Spare 2 6 I1OI22 St)are 2 Spare 2 Spare 2 Spare 2 S~are 2 Spare 2 Spare 2 Spare 28 3 ]1OI22 1291

Spare 2 Spare 2

Spare 2

Spare 2 Spare 2 8 7

6 1 10 6

6 I 10 6 6 10

4 4 10

13 4

1817

8 7

10 10

I 10

1221”1

22 29 I 22 1291 I 22 1291

‘ZL 29

I ?2 129!

8 29 8

Net. L1

141

]291

Net. L1

See

Fig. 8

Spare 1

TB1 11 TBI 11

PSB-2 Net. G

TB1 15

PSB-14

Spare 2

TB1 8 TBI 8 TBI 12

TB1 8 Net. G PSB-12 TB1 12

PSB-7 PSB-19 PSB-6 PSB-5 PSB-9

TB1 12

PSB-11

TB1 4 TB1 2 TB1 1 PSB-17

TBI

Net. L1

3 11

TBI 2

PSB-1 PSB-32 PSB-33 PSB-34

Plug D1OYcord into set

TB1 1 PSB-17

Net. L2****

PSB-17

PSB-34 PSB-34

PSB-34

Page 25

SECTION 501-164-201

TABLE E (Contd)

CONNECTIONS FOR 2870A1 DIAL TO TELEPHONE SET

TEL SET

I 2991A**

] 2992A

[ 29%3C”* I 2994C**

COMMON TIP PATH

LEAD COLOR REMOVE FROM

o .54

o 54

CONNECT TOqq LEAD COLOR

Remove Shorting Bars

G-Y 7

COMMON RING PATH

REMOVE FROM CONNECT TO***

Page 26

TABLE E (Contd)

CONNECTIONS FOR 2870A 1 DIAL TO TELEPHONE SET

1SS5, SECTION 501-164-201

STANDARD FUNCTIONS SPEAKERPHONE/ONE-TOUCH

LT 11

W-cl w-o BL-W

54 38

38 ‘7 6

54 38

* Insulate and store.

t Manufactured after 2-77 with new line switch (new line switch is identified by two additional blue leads)

$ Manufactured prior to 2-77 with new line switch. $ Manufactured prior to 2-77 with old line switch (old line switch has no blue leads).

~ Only CO lines can be dialed from adjunct dial (no intercom lines).

*“ Replace the DIOU-87 cord in the 2870A1 dial with a D1OY-5Ocord, observing same color code. tt From line key. $* From dial.

$$ Each adjunct dial adds 1 db loss to the loop. 20 ma loop current is required for proper operation of unit

~~ Spare “1s” use same spare terminal or D-161488 connector in telephone set. *** Spare

ttt Common tip lead from line key. $+* Common tip lead from line key. Terminal 1 when using 4A speakerphone. $$$ Common tip lead from line key. on terminal 2 in 2852AM sets manufactured before 3-4-77.

~~~ If speakerphone is provided, speakerphone lead designated RI must also be moved from 13 to spare ‘2.

**** Network terminal F in early telephone

“2s” use same spare terminal or D-161488 connector in telephone set.

7 6

D10U-87 CORD (FROM ADJUNCT DIAL)

R1 Al

o-w

SetS.

BR-W

Plug D1OY cord into set

* *

Plug D1OYcord into set

W-BR

G-W

2.7 Fig. 8 *

27 Fig. 8 *

SPO

W-G s-w w-s

Fig. 8 *

SPARE

Page 27

SECTION 501-164-201

CONNECTIONS FOR 870AI DIAL TO TELEPHONE CONSOLE (NOTE 1)

TEL CONSOLE

(NOTE 7)

LEAD COLOR

3, 4-Type 10, n-Type 14A1, 14A3

O-BK Net, F

BK Net. RR Spare 1 15A1, 15A3 BK 22A3R

23 A2R,23A9R 24 A8R,24B8R 29 A2R,29B2R

BK BK BK

32A3R BK

34 A5R,34B5R BK

43A5R

TABLE F

COMMON TIP PATH

REMOVE FROM

CONNECT TO t

Spare 1

LEAD COLOR REPdOVE FROM CONNECT TO :

G-R Net. C Spare 2

Spare 1 BK-BL ‘4 Spare 2

COMMON RING PATH

w Net. C Net. RR Spare 1 Net. RR

Spare 1 s Net. C Spare 2

w Net. C

Net. RR Spare 1 s Net, C Spare 2 Net. RR Spare 1 s Net, C Net. RR Net. RR Net, RR

Spare 1 Spare 1 Spare 1

Net. RR Spare 1

s Net. C Spare 2

Net. C s Net. C s Net. C Spare 2

Spare 2 Spare 2

Spare 2

Spare 2 Spare 2

53 A5R,53A9R BK 53 B5R,53B9R BK

53C5R BK 54 A8R,54B8R BK 63 B5R,63B9R 83 B5R,83B9R

83C5R

BK BK BK

128 A3R,128A-iR G 138A4R

21 -Type

41 -Type

45-Type 51 -Type

DIMENSION@

PFIX

Notes:

1“.

The following changes shall be made in the 870A1 dial in addition to connections shown in table. (a) Remove (BL-R) lead from PSB-28 and (BL-W) lead from PSB-2 and connect together using spare term. or

D-161488 connector. (b) Move the (G-W) lead from PSB-13 to PSB-2. (c)

Move the (W-G) lead from PSB-21 to PSB-28.

Remove (G) or (BL) dial lead from term. 19 in console and connect to (W-G) lead of D1OU cord using spare term.

or D-161488 connector.

Remove (G) or (BL) dial lead from term. 42 in console and connect to (W-G) lead of D1OU cord using spare term.

or D-161488 connector.

Remove (G) or (BL) dial lead from term. 11 in console and connect to (W-G) lead of D1OU cord using spare term.

or D-161488 connector.

Net. RR Net. RR

Spare 1

Spare 1 Net. RR Spare 1 s Net. C Net. RR Spare 1 Net. RR Spare 1 Net. RR Spare 1 Net. RR Spare 1 42 ~ Spare 1 R

42 g

Spare 1

s s

Net. C Net. C

Spare 2 Spare 2

Spare 2

Net. C

Spare 2 s Net. C Spare 2 s Net. C s Net. C

Spare 2

4 Spare 2

-1 Spare 2

●

Not Compatible

Page

Page 28

1SS 5, SECTION 501-164-201

CONNECTIONS FOR 870AI DIAL TO TELEPHONE CONSOLE (NOTE 1)

W-BL

Spare 1

Spare 1 Spare 1 Spare 1 Spare 1 Spare 1 Spare 1 Spare 1

Spare 1

w-o EL-W

Net. F Spare 1

Net. RR Spare 2 Net. RR

Net. RR Spare 2 Net. C Net. RR Net. RR Spare 2 Net. C Net. RR Net. RR Spare 2 Net. C

Net. RR Spare 1 Net. RR Spare 1

Net. RR Spare 1 Net. RR Spare 1 Net.. RR

Spare 1 Spare 1 Spare 1

Net. RR Net. RR

Net. RR Spare 1 Net. RR Spare 1 42 $ Spare 1 42 g

TABLE F (Cent)

D1OU%7 CORD (FROM ADJUNCT DIAL)

STANDARD FuNcmoNs

LR,

Spare 2

o-w BR-W W-BR

Net. C TB2 3

4 Spare 2 Net. R

Net. C

Spare 2

Net. C

Net. C Spare 2 Net. C Spare 2

Net. C Spare 2 Net. C Spare 2 Net. C Spare 2

Net. C Spare 2 Net. C Spare 2 Net. C Spare 2 Net. C Spare 2 Spare 2

4 4

Ml M2

* *

* * * * *

* * * * * * *

* *

Net.. R

TB2 4

Net. GN

* * *

* * * * * *

* * *

Net. GN

* *

G-W

7 Note 6

W.G

* *

s-w w -s

* * *

7 Note 6 6 8

19 Note 2

28 29

42 Note 3 39

11 Note 4

28 Note 5 33

19 Note 2

11 Note 4 11 42 Note 3 39 42 Note 3 39 42 Note 3 39

42 Note 3 39

Note -t 42 Note 3 42

Note 3 39 42 Note 3

11 39

39 37

* *

14 34 29

14 38 38 38

1.1

Not Compatible

5. Remove (G) or (BL) dial lead from term.2t3 in console and connect to (W-G) lead of D1OU cord using spare term. ‘or D-161488 connector.

6. Remove (G) dial lead from term. 7 in console and connect to (W-G) lead of D1OU cord using spare term. or D-161488 connector.

7. To allow proper placement of adjunct the D1OU-87 cord may have to be replaced by a

observing-same color code.

Insulate and store.

Spare “1s” use same spare term. or D-161488 connector in console. Spare “2s” use same spare term. or D-161488 connector in console. If neither Privacy nor DSS option is provided, this will be terminal 22.

D1OR-87 cord,

?age 29

Page 29

SECTION 501-164-201

CONNECTIONS FOR 2870A1 DIAL TO TELEPHONE CONSOLE

TABLE G

COMMON TIP PATH

TEL CONSOLE

(NOTE 1 AND 2)

LEAD COLOR

2-Type$ Strap

10, 11-’rype R.S 14A2, 14A4 BK 14A5, 14A6

BK 15A2, 15A4 BK 15A5, 15A6 BK 22A3T

23A2T,23A9T 24 A8T,24B8T

26A9T

27-Type

28-Type

29 A2T,29B2T

32A3T

34 A5T,34B5T

43A5T

46A9T

47-Type 48-Type

53 A5T,53B5T

53 A9T,53B9T

53C5T

54 A8T,54B8T

56A9T

63 B5T,63B9T

83 B5T,83B9T, 83C5T

121-Type

128 A3T,128A.IT

131-Type

138A4T

151-Type

.Votes:

1. Toallow proper placement ofadjunct, the D10U-87may have to bereplaced bya DlOR-87 mounting cord, observing same color code.

2. 2870A1 dial not compatible with 21, 41-, 45-, 51-Type or AGD-, A G H-Type (DIMENSION PBX) consoles.

* Insulate and store.

BK Net. RR Spare 1

G TB1 6 TB1 7 S, O-BK

BK Net. RR

BK Net. RR Spare 1 BK Net. RR Spare 1

BK Net. RR Spare 1

BK Net. RR

BK Net, RR Spare 1

BK TB1 415 TB1 3 G TB1 22 TB1 5

BK TBI 415 TB1 3 Y-o TBI 22 TB1 5

BK TB1 41$ TB1 3 Y-o TB1 22

REMOVE FROM CONNECT TO t

LEAD COLOR

TB1 9-14

Spare 1 Net, RR Spare 1 Net, RR Spare 1 Net, RR Spare 1 Net, RR Spare 1

Net. RR

Net, RR

Net. RR

TB1 8$ TB1 3

Net. RR

TB1 85 TB1 3 TB1 6 TB1 7 S, O-BK

Net. RR Spare 1

42 **

42, **

Spare 1

Spare 1 R 4 Spare 2

Strap

BK-O

w Net. C Spare 2 w w w s Net. C s s

w -o

s s s s s

w-o

s s’ Net. C s Net. C Spare 2 s s Net. C s Net. C

s Net. C Spare 2

R 4 Spare 2

COMMON RING PATH

REMOVE FROM CONNECT TO f

TB1 3-8

Net. C Spare 2

Net. C Spare 2 Net. C Spare 2

Net. C Net. C Spare 2

Net. C

TB1 45

TB1 1 TB1 2

Net. C

Net. C Spare 2

Net. C

Net. C Spare 2

TB1 45

TB1 1 TB1 2

Net, C Spare

Net. C Spare 2

Spare 2

Spare 2 Spare 2

Spare 2

TBI 5

Spare 2

TB1 5

Spare 2

TB1 5

Page 30

1SS5, SECTION 501-164-201

TABLE G (Contd)

CONNECTIONS FOR 2870A1 DIAL TO TELEPHONE

D1OLJ.B7 CORD (FROM ADJUNCT DIAL)

STANDARD FUNCTIONS SPEAKERPHONE/ONE-TOUCH

CONSOLE

LT T1 LR RI

W.BL

TB1 14 TB1 9 TB1 8

5 Spare 1

Spare 1

Spare 1 Net. RR Spare 2

Spare 1

Spare 1 Net. RR Spare 2

Spare 1

Spare 1 Net. RR Spare 2

TB1 8

TB1 6

Spare 1 Net. RR Spare 2

Spare 1 Spare 1

Spare 1

TBI 8 TBI 3 TB1 5

TB1 6 TBI 7 TB1 1 Spare 1

Spare 1 Net. RR

Spare 1 Net. RR Spare 1 Spare 1 Spare 1

W.o BL.W

4 Spare 2

Net. RR Spare 2

Net. RR

Net. RR Spare 2

Net. RR

Net. RR Spare 2

TB1 3 TB1 5

TB1 7 TB1 1

Net. RR

Net. RR Spare 2 Net. C *

Net. RR Spare 2 Net. C

Net. RR

Spare 2 Net. C

Spare 2

Spare 2 Net. C

Spare 2 Net. RR Spare 2 Net. C Net. RR Spare 2 Net. RR

Spare 2 Net. C

o-w

TB1 3

Net. C

TB1 45

TB1 2

Net. C

TB1 45

TB1 2

Net. C

Net, C

Net. C

BR-W

W.BR

G-w

SPO

W G

SPARE

SW w -s

* *

Spare 1

Net. RR Spare 2

Net. C

TB1 41 TB1 3 TBI 5 TB1 22 Spare 1 TB1 41 TB1 3 Spare 1

42 **

Spare 2

TB1 5

Spare 2

TB1 22

TB1 41 TB1 3 TB1 5 TB1 22

Spare “1s” use same spare terminal or D-161 488 connector in console. Consoles equipped with TOUCH-TONE dialing only. Lead from network terminal RR. Spare “2s” use same spare terminal or D-161488 connector in console.

If neither Privacy nor DSS option is provided, this will be terminal 22,

Page 31

SECTION 501-164-201

To C(

TIP

(NOTE 1 )

RING

(NOTE1:

——.

ROTARYU? “TI?UCH-TONE” TELEPHONESET (WP I CAL)

———

OIOIJ-87

(W-EL) cm

(w-o)

(G-u)

(*G)

(o-w)

(BL-W)

(BR-U)

(U-M )

I .-

LK 1s

SPO 2 ‘

LR 2

2) Ml ~

(NOTE

(NOTE2) M2 8

2870A I DIAL

———

——— .

———

(s-w)

(w-s)

.——

A(3

-—

L J

NOTES

1, LT ANO LR LEADS OF THE ADJUNCT DIAL MUST CONNECT TO THE INCOMING TIP AND RI NC

LEADS IN THE TELEPHONE SET AT THE FIRST ACCESSIBLE PO INT. IN THE CASE OF KEY TELEPHONE SETS, IT MUST BE F3EHIN0 THE LINE PICKUP KEYS. THE LT, TI , ANO LR, RI , LEADS MUST BE CO* NECTED IPJTO THE TELEPHONE SET IN SERIES WITH THE TIP AND RING PATH,

z, THE (BR-W) AND (W-BR) ARE HANDSET MUTING LEADS ONLY IN CASE OF THE 870A1 DIAL ONLY.

@ CONNECTION kllTH ADJUNCT DIAL

~ NORMAL TELEPHONE SET CONNECTION

@ ROTARY TEL SET @ “TOUCH-TONE” TEL SET

INSULATE AND STORE

t TERMINAL ON NETWORK

P3 3

P4 6

——.

——-

SPARE

,——.

SPARE ——

1 .

I I

$ SPARE TERMINAL OR O-161488 CONNECTOR

DP OIAL PULSE

I BATTERY I

Page 32

Pig. 6—@asic Interface Connections for 870A1 and 2870A1 Dialst

Page 32

1SS5, SECTION 501-164-201

108-TYPE

LSPK

——,

———

P3 (IT)

P4 (IR)

SPO

—

TO C,O. —

>B (f4J) OR 4A SPEAKERPHWAE INTERFACE CONNECTIONS USING IW CR 149S ADAPTER OR 2230 ADAPTER OR 820 CENN BLOCK

(NOTE 1)

(NoTE

TIP

SPO

LS ; -

LS )

ONI

‘(NOTE 2)

@fR’

●

LS) (:

(u-o)

(BR-w)

(!4-s)

(M-G)

(o-w)

OIAL

870A1

J–L– –s

LK 1~

SPO

_—

— —

—

OIAL- TONE OETECTOR

SPO

@– fiG@’2

. ——

BATTERY

— —-

— —

A’+’

2870A1

SPO : (

680-TYPE

TRMTR

&--

NOTES:

SEE FIG. 8 ON “SKI” CONNECTION ANO APPL ICABLE

sECTION IN 01 VISION 512. ROTARY O IAL SET ONLY.

LT ANO LR LEADS OF THE ADJuNCT OIAL MUST

cONNECT TO THE INCOMING TIP ANO RING LEAOS IN Il{t TEL EF+IONE SET AT THE FIRST ACCESSIBLE

POINT. IN THE CASE OF !(EY TELEPHONE SETS,

11 MUST BE BEHINU THE LINE PICKUP KEYS. THE

LT. 11, ANO LR, Rl, LEAOS MUST BE CONNECTED

INTO THE TELEPHONE SET IN SERIES UITH THE TIP

AND RING PATH,

@ - CONNECTION 141TH AO.JUNCT DIAL,

@ - NORPAL TELEPHONE sET CONNECTION.

@ - ROTARY DIAL SET

@ - “TOUCH-TONE”

TELEPHONE SET DIAL

Fig. 7—$870A1 and 2870A 1 Dials, Basic Interface Connections for One-Touch Calling

Optiont

TO C.O

(NOTE :

RINC

a%I=ll=

+C - INSULATE AND STORE

t - TERMINAL ON NETMORK $ - SPARE TERMINAL OR O-16148B CONNECTOR

DP - OIAL PULSE

ON - OFF NORMAL

M2SL-87 CORD

(BL-W)

Page 33/34

Page 33

3S (K)) S?EAKERPINME

1SS5, SECTION 501-164-201

870A1

DIAL

2870A1

SPO

lYPICAL TEL SET

Ml 6H CORG

(o-R)

TEL SET MTGcm

(o-v)

) 22

1 I

6.BUTTXA KEY SET UITH 50-PIN CONNECTOR

I 1

1496 AOAPTER

LI 22> ‘o-v)

4A SPEAKERPHONE

INSIDE

MIRE

020N MTG CORO

5% CfflTROL

WIT

CONNECTOR CABLE

* TO KEY EQUIPMENT

10B-TYPE LSPK

WA cm

(0-BK)

666a TRMTR

680- lYPE TRMTR

NOTE :

FOR THE ONE-TOUCH OPT ION

ONLY, ADD STRAP MIRE FROM

TERMINAL 10 TO TERMINAL 35,

* INSULATE ANO STORE

t SPARE TERMINAL D-1 61488

CONNECTOR, OR IN CASE OF

“TOUCH-A-MdTl C“ TEL SET IT UOULD BE THE SPO TERMINAL

ON PSB.

* THIS (M-G) CONOUCTOR IS IN

THE OIOU OR OIOY MOUNTING

CORD

Fig. 8—870A 1 and 2870A1 Dials,

m I--+52d 08s II-J

“SPO” interface Connections for One-Touch Calling

(w-o)

(o-t?)

1 T

108-TYPE LSPK

6B0-TYPE TRMTR

(w-o)

MTG CORO

Page 35

Page 34

SECTION 501-164-201

FIG. H

BATTERY

KS-205W. L4

FIG. A

MEMCRY

PB ‘

WDC

lDP’

VGL

CR ODP’

RCO

FIG. B

PC$iERSUPPLYBOAKI

PSB

zdl

1 I

I 7Q

m7 RELAY

vOD

)

10 @

120

- @.@ (0-13K)

_ BLACK STRAP (w_BR)

.0, @ (o-y)

. “o

(m-w)

(s4)

(Y)

(BL)

(Y)

(u-s)

(o-u) R1

(R-8L) RI

(G4)

(Y4) [G

(BK-BL)

INFlll

FIG, G

INFllT

‘IG. 1

%- ‘B+‘R)

@ WITHOUT DIAL TONE OETECTOR

@ WITHOUT ONE-TOUCH CALLINC

@ ONE-TOUCH CALLING (Associated

1I“LEPHOFIESET MUST BE EQU IPPEO dlTI- SPEAKERPHONE)

@ OlhL TONE DETECTOR ONLY

+P!-+ ::-0)

24 @

270

28 @

Pig. 9—$870A1 Dial, Connections (Sheet 1 of 2)4

(Y)

(EL-R)

VDC

IG.

SPF

SP(

SPO

AC1

Ac2

LR’

Page 36

Page 35

1SS5, SECTION 501-164-201

FIG. B

FIG. C

LINE SENSlffi RELAY PWB

841382880

LT Voo R1 T1

(BK4L) (M-G) (R-BL) (8L-BK)

L I

INPUT

INPUT (G-R)

SPR (Y-EL)

DTT (BL-Y)

DT (O-Y)

FIG,

cm (BK-0)

VOD (R-O)

SPO (G-Y)

LK (Y-G)

FIG. D

01 AL T@AE DETECTfXl

(P/O 0-1 B0495 )

(G-R)

(Y-o)

(0-BK)

(O-R)

010

011

012

FIG. E

ONE-TCIJCH CALLING SWITCH

(P/O D-1 80493 )

FIG. G

8EA -119 OIAL

1 I

(BL)

DIOU-87 MOUNTING CORD TELEPHONE SET

LK (G-W) ~

FIG

P3 (s-w)

M2SL-87 POWER CORO

FIG. F

(w-o)

(o-w)

(w-13L)

(w-BR)

(w-s) *

ASSOCIATED

95B1

POWER UN IT

I 1

o TIP

a RING

RECORD DISABLE/O IAL !NTERMIX 5Wl TCh (D-1LI0818)

m@=l”G’

OIAL PULSE

DP -

OFF NORMAL

ON -

INSULATE ANO STORE uNLESS SPEAKERPHONE IS PROV 10EO

SPARE TERMINAL OR 0-161488 CONNECTOR

APPROPRIATE TERMINAL TO PROV 10E MUTING OF RECEIVER

INSULATE ANO STORE UNLESS ONE TOUCH CALL IN’ IS PROVIDED

FIG. H

(9L)

(Y)

(w)

FIG, B

Fig. 9—$870A1 Dial, Connections (Sheet 2 of 2)4

Page 36

1SS5, SECTION 501-164-201

4’7!-’IP

TO TEL SE7

SPO

PSS.7

DIOU-87

MTG

CORD

(sL-w)

l-l

(0-44)

(G-U)

(ER-w) ‘se-t

(Y-G)

I ‘l!!c::E

(0-180495)

[

SPO

,1~~ ‘y .

——— —

i-k?-e-l.,

... -,

LT (W4L)

[Ws)

PSB-2

PSB-9

PSB-13

PSB-21

–-l-

MB75

(G-R)

@* @

(G-R)

~ PSB-16

MB76

l--

k k &

‘s6-22 [BL-V)

~DPR5

) (

P*Z8

MB73

(R-EL)

ONI

(Y)

PSB -6

.—

➤ @ 327K @i

1°

,. m

(BK-BL)I ~

ON2

MB7\

(BL4)

( )

-——

IOOE

10OE

——— ——— —

-—.

LINE SENSING RELAY

——— ———

PI-6

PSB-14

(G-W)

1!’ :’: ,

P I-20

757A

(DpR)

MB74

PSB-22

M2SL-87 POWER CORO

q--w:

~ ONE-TOUCH CALLING @ OIAL TONE DETECTOR ONLY

L–––––.

Fig. 10—$870A 1 Dial, Partial Functional Schematic4

.—————————

PSB-1’7

(H-G)

Page 39

Page 37

SECTION 501-164-201

1 2

3 >;

5 >: 6

(6K) i

(6K) 1

10 >; 11 12 13 >; 14 15

8 >;

FIG

w y

-1

4),

5 >:

1 1

VDD (R)

WDC (BK)

FIG,

RCD (m)

(0-!.4)J2 (!J-s) ! (Y-G) ~~ ;

-5

FIG,

(w-o) !< B (G-w) !< (u-BR) ‘ ,:

KS-20590, L4

NOTE :

OIAL FACTORY WIRED FOR @ AND @ CONNECTIONS OPTION:

@L4 THOUT OIAL TONE OETECTOR @WITHOUT ONE-TOIJcH cALLING

@ ONE-TOUCHCALLING [ASSOCIATE TELEPHONE

MuST BE EOUIPPEO wITH SPEAKERPHONE)

@ DIAL TONE DETECTOR ONLY

* INSULATE ANO STORE

BATTERY

B- (Y)

r 1

-EB

B+ (R) 1

vGL Dll

SPR OT

Pc SH

DT VOD-1

RESET VR VDO-2 B+

PF.3 NEG

Pos

‘4 B- (Y)

(BK)

I \ B+ (R)

FIG. B

PUR SUPPLYBWIKI

PSE (SEE NOTE)

(o)

l+QQ-1

NEG

;1 CE

‘; CE

;; c~ ;ICC%?F ~

;1 CA

‘; Cn

,,-

STRAP

(BR) j2~

●

(BR-U)

(Wa)

(R-G)

[s-w) (w-s)

10QJ I

(R-BL) (o-w)

18@

19Q

25@

24@

Jo. . @.@

26fl

27 (Y-BL)

~o@

710

550

- @!@

+@ 0,0 (R-O)

STRAP (fiK)

- @,@

- @.@

-0

(G-W)

(o-Y)

(w-G)

(Y-o)

(EL-v) PL

(O-R;

(EL-Y;

(s) S1

(s)

(BK-03

(Y)

(BK)

(w-BR)

(Y-G)

(G-w)

(G-Y)

(W-G)

(BL-BK)

S2 ~

FIG.

vOD

SPARE

FIG.

AC1

AC2

SPO

INPuT

INPUT

FIG.

Voo

DT1

SPR

COM

,,,

‘c

1.K

SPO

Page 40

Fig. 11 –$2870A1 Dial, Connections (Sheet 1 of 2)4

Page 38

1SS5, SECTION 501-164-201

LINE SENSINGRELAY~

Voo

FIG.

SHi (G-U)

ONE-TOUCH CALL IffiSWITCH

(P/o o-1 B0493) (SEE NOTE)

D1 OU-B7

MOUNTING CORU

SPO

FIG.

AG SPARE SPARE

POMER CCRO

==El

“~’~

mFIG

FIG. C

84’(%-%8:

(w-G)

(R4L)

(BL-BK)

(13L-v)

(8L-R)

FIG. E

FIG. F

(G-U) *

(w-G) *

(u-L7L)

(BL-W)

(BR-u) (w-BR) (s-w) *

(w-s) *

M2SLJY7

FIG. H

425K OR 4228 -lYFf

NE7WORK

FIG. I

RECORO IJISABLE/ oIAL INTERMIX SWITCH

(0-1B081B)

, ‘

ASSOCIATED TELEFHCNE

SET

0 0

95B1 ?OhER uNIT

NOTE:

AS50C IATEO TELEPHONE SET NUST BE EQUIPPEO HITH SPEAKERPHONE

INSULATE ANO STORE

SPARE TEP#l NAL OR

O-1614BB CONNECTOR

INSULATE ANO STORE uNLESS

ONE TCXJCH CALLING IS PROV 10EO

(ASSOCIATE TELEPHONE

SETEOUIPPEOWITH

SPEAKERPHONE)

FIG.

1 (Y-G)

o IAL TCNE OETECTOR (P/O O-1 S0493)

INPUT

INPUT (G-R) SPR OTT OT

FIG.

P1.

VOD

SPO

CCY’lMOt4SW{TCH

EEi

FREQUENCY SW ITCHES

FIG, (BR)

“L’ -

(wJ3R)

(M-o)

:O.gg

~ H ‘ b-+-+- ‘2

-$-j- j-$ A

$-A-+- -J

I I

(Y-L3R)

l-l

FIG. A

FIG. D

(G-R)

(Y-BL) (BL-Y)

(o-Y)

(Y-o)

(0-OK)

(L7K-0)

(O-R)

(R-O)

(G-Y)

(Y-G)

FIG. G

OIAL

(Y-o)

(o)

(~L) FIG

(w-EL)

(w)

(v-EL)

(s-R)

(BR-w)

1 2 5 4

5 6 7

(G-w)

FIG.

(o-u)

(w-G)

(w-s)

Fig. 11 –$2870A1 Dial, Connections (Sheet 2 of 2)4

Page 41

Page 39

DIW-87

MTG CORD

(w-BL)

(w-o)

PSB-16

PSB-2

PSB-35

(G-R)

PSB-8

~ (BL) ,

)(

4 I

ion

(OK-t3L 1

(6L-BK )

PSB- 4

‘ShJpl-::f’npl-lo

4 (G)

be- I 3

——— — — —

PI-4

—— —— —__ _

——

TELEPNM SET

qgqt$’=f’:;

(G-w)

(m-w) PSB- I

MB71

(w-BR )

--u

SPO

(w-G)

(o-w) PSB- I I

(t3L-w) PSB-17

-1

U2SL-87 POWER CORO

Pm- 33

(Y-G)

—————

D I AL TOW OETECTOR

(o- I 80493)

SPO*

~5B-32 l——— — —

PSB-34

(G-,) 0

PSB- 12

SURGE

PROTECTOR

501E

(G-R )

@ONE-TOUcti CALLING @ OIAL TONE DETECTOR ONLY

PSB-6 ICIQ

(Y)

* INSULATE AND STORE

(R-BL)

(EIL-R)

POLARI TY

GUARD

(R)

,s8- 25

~1<

IPSB-51

(

(BL-v)! 5

PSB- I 5

~–––___–––__––___T

●

327K

I00[

! I IOOE

L––––––-

(6K-0)

I P3-15

NET. ‘R

LINE

SENSING RELAY

— — ——

PSB-18

TO I(G-w)]

I PSB-21

2@ ~(w-G)

—

–J

(R-G)

Fig. 12 —$2870A 1 Dialr Partial Functional Schematic

Page 40

$TABLE H ~

TROUBLE ANALYSIS - 870A1 DIAL

1SS5, SECTION 501-164-201

TROUBLE

NUMBER

FAILURE

Dead set when off-hook

ADDITIONAL

SYMPTOM

No dial tone. Cannot Mounting cord

transmit or receive when

off-hook using handset

2 Cannot manually dial

Cannot break dial tone when off-hook using or cannot hang-up set either telephone set dial or 870A1 adjunct dial

Cannot manually dial Cannot dial using set when off-hook using dial but can manually adjunct dial dial using 870A1 dial

only when ac power

is disconnected

No dialing clicks heard

when dial is returning.

Condition remains un-

changed when 9.5B1

power unit is

disconnected

4 RECORD lamp does RECORD lamp does

not function properly not turn on when

RECORD button is

depressed or RECORD

lamp is on and cannot

be turned off

RECORD lamp does

not turn on when

RECORD button is

depressed

POSSIBLE

CAUSE ACTION

REMEDIAL

Check cord connections improperly connected to telephone set

from line to telephone set or console and to adjunct dial. See Fig. 6, 7 or Tables D, F

Open cord conductor er defective Line

Check continuity between W-BL and W-O

Sensing Relay PWB conductors and between

BL-W and O-W conduc-

tors. (Nominal resistance

is 8 ohms. ) If open, re-

place mounting cord

Line Sensing Relay board

Unknown Replace adjunct dial * Extension station off-

hook

Place extension station

on-hook

Improperly installed or 1. Check connector defective memory cable

2. Replace memory

Defective PSB Replace adjunct dial*

Improperly installed or 1. Check connections defective rotary dial 2. Replace rotary dial

Unknown

Battery not plugged in

Replace adjunct dial*

Connect or replace

or defective battery

AC power not present Check for commercial

power

95B1 power unit not

Check or replace power

plugged in or defective unit (should read 13.4 to

18 Vac across screw terminals 24 and 25 on PSB

Switch of D-180818 Kit of Parts

Change switch position to OFF

in ON position.

Bad connections or defective M2SL-87

1. Check connections and cord

cord 2. Replace cord

*Refer to paragraph 6.02(4).

Page 43

Page 41

SECTION 501-164-201

$ TABLE H (Contd) ~

TROUBLE ANALYSIS -870A1 DIAL

TROUBLE ADDITIONAL POSSIBLE NUMBER

FAILURE

SYMPTOM

CAUSE

Memory, RECORD

(Co:td)

OFF or WAIT button

stuck down

Defective lamp or lamp Replace memory driver circuit

Unknown

Lamp turns off when Defective logic any memory button is

depressed

Unknown Replace adjunct dial*

Lamp does not turn off Improperly connected 1. Check rotary dial

as dial is returning. No or defective rotary dial

MB7 relay clic!c heard (off-normal contact) 2. Replace rotary dial

at beginning of dial

wind-up or at end of

Unknown

dial return Lamp does not turn off Improperly connected 1. Check connector cable

as dial is returning, but or defective memory MB7 relay click is heard at beginning of dial

Unknown

wind-up and at end of dial return. Can manually dial off-hook

Lamp turns off as dial is returning and stays off

Memory button was not Record per paragraph 5.01. depressed prior to the operation of the dial

Defective memory Unknown Replace adjunct dial*

5 Cannot record properly RECORD lamp func-

into the 31 memory positions or into LAST NUMBER DIALED position

tions properly and can manually dial using adjunct dial

Party is reached when number is recorded as it

Defective Memory Replace memory Unknown

Check recording procedure

is manually dialed; however, when number is subsequently dialed

from memory, party is

not reached — wrong

number is dialed from

memory

Cannot dial properly from memory

MB7 relay clicks heard

when manual dial is

Defective memory Replace memory

Switch of D-180818 Kit of Parts

in ON position Unknown Replace adjunct dial* Battery not plugged in Plug in battery

operated, but no auto-

matic dialing possible. RECORD lamp does not light

REMEDIAL

ACTION

Clear stuck button

Replace adjunct dial* Replace memory

connections

Replace adjunct dial*

2. Replace memory Replace adjunct dial*

Replace memory

Replace adjunct dial*

Record per paragraph 5.01.

Change switch position to OFF

Refer to paragraph 6.02(4).

Page 44

Page 42

0 TABLE H (Contd) 4

TROUBLE ANALYSIS – 870A1 DIAL

1SS 5, SECTION 501-164-201

TROUBLE NUMBER

(Co:td)

FEATURE

●Refer to paragraph 6.02(4).

ADDITIONAL

SYMPTOM

MB7 relay does not operate (no click heard) when memory button is depressed

Can dial from memory by adding temporary

strap lead between PSB terminals 14 and 17

MB7 relay operates (click heard) when memory button is depressed but no dialing

clicks are heard. In

addition, transmit and receive levels are very

low

No digits, random digits

or all the same digits in memory location(s). Note: memory may or ~not have functioned properly at

some previous time

“k

I termmal 20

\ Improperly installed or

Automatically dials Memory not securely through a WAIT

I Unknown

POSSIBLE

CAUSE

Memory not securely mounted

Improper connection to or defective memory

defective Line Sensing Relay PWB

Unknown

WAIT button is stuck down or defective

Unknown

AC power outage for 24 hours or longer

Disconnected or defec.

tive battery

Defective memory Unknown

mounted Improper connection to

PSB terminal 23

Defective memory

REMEDIAL

ACTION

Tighten memory mounting screws

Check and/or replace strap lead. See Fig. 9B

1. Check connector cable

2. Replace memory

1. Check connections

2. Replace Line Sensing Relay PWB

Replace adjunct dial* Free stuck WAIT button

or replace memory Replace adjunct dial*

Reestablish ac power

and rerecord numbers

into memory

—.

Plug in the battery

1. Allow the battery to

2. be charged for a minimum of 5 minutes. Then remove the power unit from the ac power outlet for 10 seconds and reinsert If previously stored

3. numbers are not dialed from memory, replace the battery

Repeat procedure Replace memory Replace adjunct dial* Tighten memory

mounting screws Check connection to and/

or replace strap to PSB terminal 23

Replace memory Replace adjunct dial*

Page 45

Page 43

SECTION 501-164-201

TABLE H (Contd)

TROUBLE ANALYSIS – 870A1 DIAL

TROUBLE

NUMBER

(Co~td)

*Refer to paragraph 6.02(4).

Cannot dial properly from memory when off-hook and using adjunct dial (wired for dial tone detector only )

Speakerphone does not turn on when a memory button is momentarily depressed (wired for ONE-TOUCH option )

FAILURE

ADDITIONAL

SYMPTOM CAUSE

Number appears to be [ Switching transients dialed out correctly but results in “high and dry” greater than 300 millicondition or connection to invalid number pat ibility with recording switching

MB7 relay clicks when I Battery not plugged in manual dial is operated, but no automatic dialing possible. RECORD lamp does not light

MB7 relay does not operate (no click heard ) when memory button is depressed

does not correct problem

Addition of temporary strap lead between PSB terminals 11 and 20 corrects problem

With addition of a temporary strap between PSB terminals 15 and 20, speakerphone turns on when a memory button is depressed

With addition of a tern- \ Defective connections porary strap between PSB terminals 13 and detector and PSB 21, speakerphone turns on

POSSIBLE

causing line break

seconds due to incom-

Precise dial tone may not be present

Improper installation of dial tone detector

SPO path not completed via proper lead in telephone set mounting cord

With 4A speakerphone

82B connecting block

not modified per Fig~ 8 ONE-TOUCH calling

switch in OFF position

Defective ONE-TOUCH

calling switch

between dial tone

REMEDIAL

ACTION

Consult your Telco engineer

Plug in battery

Make sure precise (350 Hz and 440 Hz) dial tone is present

Tighten memory mounting screws

Check connections for

D-180493 installation.

See Table B.

1. Check connector cable

2. Replace memory

Replace D-180493 dial ‘ tone detector

Replace adjunct dial*

Check for correct lead assignment per Fig. 8.

Replace switch assembly of D-180493 Kit of Parts

Check (Y-G) and (G-Y) leads to PSB terminals 13 and 21

Replace Line Sensing Relay PWB

Replace dial tone detector of D-180493 Kit of Parts

I I

Poge 46

Page 44

$TABLE H (Contd) 4

TROUBLE ANALYSIS –870A1 DIAL

1SS5, SECTION 501-164-201

TROUBLE NUMBER

Speakerphone turns on

FAILURE

but adjunct dial does

not automatically dial when memory button is depressed (wired for ONETOUCH option)

10 Delay time between

depression of a memory button and initiation of automatic dialing exceeds 3 seconds (wired for ONE-TOUCH option)

12 Automatic dialing

Cannot turn speakerphone off (wired for ONETOUCH option)

commences for no 2. Consult Telco

apparent reason

(wired for ONE-

TOUCH option)

Adjunct dials auto-

matically but does not between PSB-21 and

wait for dial tone

(wired for ONE-

TOUCH option )

ADDITIONAL

SYMPTOM

POSIBLE

CAUSE

(BK) strap leads from screw terminals 11 and

Disconnect, insulate and

store strap leads

REMEDIAL

ACTION

23 on PSB were not disconnected when option was wired

Set automatically dials

when screw terminals 11

and 20 on PSB are tem-

porarily shorted

Precise dial tone not 1. Check CO line for present or a defective

presence of precise

dial tone detector dial tone (350 Hz and

440 Hz)

2. If correct dial tone is present, replace dial

tone detector PWB assembly of D-180493 Kit of Parts

Defective timing circuit

1. Replace memory

2. Replace dial tone detector PWB assembly of D-180439 Kit of Parts

Speakerphone turns off when OFF button is depressed but turns on when OFF button is released

Memory button de- Depress RECORD OFF pressed when TIP and

button and then depress RING not connected speakerphone OFF to telephone set

(BK) strap lead from

button

Disconnect, insulate and terminal 18 on PSB was store strap lead not disconnected when

option was wired

Speakerphone turns off

Defective logic from

Replace memory

and stays off when memory (Y-BL) lead is disconnected from terminal 18 on PSB and OFF button is depressed

Speakerphone turns off

when handset is taken

Defective circuit on

D-180493 Kit of Parts tor board assembly of

Replace dial tone detec-

off-hook but turns on D-180493 Kit of Parts

when handset is placed

on-hook

Static discharge damage 1. Replace memory

engineer for proper grounding procedures

Noise on line 1. Add .05 pf capacitor

PSB-26

2. Remove above capacitor and add resistor (10kS2 — 50k Q) in series with a G-R dial tone detector input lead

Page 47

Page 45

SECTION 501-164-201

*TABLE I t

TROUBLE ANALYSIS – 2870A1 DIAL

TROUBLE NUMBER

1 Dead

FAILURE

set when off-hook

2 Cannot manually dial

when off-hook using telephone set dial or adjunct dial

3 Cannot manually dial

when off-hook and using adjunct dial

Cannot manually dial some digits when offhook using adjunct dial

RECORD lamp does not function properly

ADDITIONAL

SYMPTOM

No dial tone Cannot transmit or

receive when off-hook

using handset

POSSIBLE

CAUSE

Mounting cord

improperly connected to telephone set

Check cord connections from line to telephone set or console and to adjunct dial. See Fig. 6, 7 or Tables

F, G

Open cord conductor

or defective Line

Sensing Relay PWB

Check continuity between W-BLand W-O conductors and between BL-W and O-W

conductors. (Nominal

resistance is 8 OHMS. ) If open, replace mounting cord or Line Sensing Relay

Board

Unknown Replace adjunct dial*

Clicking sounds or damp-

led TOUCH-TONE dialing

Extension station off- P1ace extension station on-

hook hook signals heard when dial buttons are depressed. Cannot hang up set

No audible TOUCH-

TONE dialing signal present

Power supply cable

connector not preperly inserted on

Check connector insertion

memory Dial connectors not 1. Check connector”

properly inserted Defective memory

2. Replace 35-type dial Replace memory

Unknown Replace adjunct dial* i

Some TOUCH-TONE dialing frequencies in-

Static discharge damage

1. Replace memory

2. Consult Telco engineer

correct

Open or loose leads to Check for proper insertion dial contacts

of leads into 10-position dial connector

Defective frequency

Replace 35-type dial contacts on 35-type dial

Defective memory

Replace memory

Unknown Replace adjunct dial*

RECORD lamp does not turn on when

Battery not plugged Connect or replace in or defective battery

RECORD button is depressed or RECORD lamp is on and cannot be turned off

RECORD Iamp does

AC power not present Check for commercial

not turn on when power RECORD button is depressed

REMEDIAL

ACTION

for proper grounding procedures

*Refer to paragraph 6.02(4).

Page 48

Page 46

$ TABLE I (Contd) t

TROUBLE ANALYSIS - 2870AI DIAL

1SS5, SECTION 501-164-201

TROUBLE

NUMBER

(C~ntd)

‘7

FAILURE

Cannot read into memory

Cannot record properly into the 31 memory positions or into the LAST NUMBER DIALED position

ADDITIONAL

SYMPTOM

Power unit not plugged in or defective

Bad connections or defective M2SL cord

POSSIBLE

CAUSE

Kit of Psrta in

ON position

~ Defective lamp or lamp \ driver circuit

\ Static discharge damage

I Unknown

Lamp turns off, flashes or ! Defective logic

lighta erratically when any

memory button w depressed ~ Unknown or lamp does not momentarily turn off when dial button on adjunct is depressed

RECORD lamp momentarily flashes when RECORD button is depressed

Digita appear to be Dialing problem accepted correctly but

cannot automatically diaf

from memory

Warble tones heard when automatically dialing. Get intercept for automatic or manual diafing

RECORD lamp does not

light ! Kit of Parts in

Stuck RECORD OFF button

WAIT contacta closed even when WAIT button is not depressed or stuck WAIT button

‘ Defective Line Sensing , Relay PWB

I WAIT contac~ closecl even

when WAIT button is not depressed or stuck WAIT

I button

Switch of D-180818

~ ON position

REMEDIAL

ACTION

Check or replace ower

to 18 Vac across screw

terminals 30 and 31 on PSB

1. Check connections and cord

2. Replace cord

Clear stuck button

~oh~ : switch position

Replace memory

Replace adjunct dial* Replace memory Replace adjunct dial*

Check RECORD OFF button

Replace memory

funit. Should rea 13.9

Replace Line Sensing Relay PWB

See Trouble No. 8”

Replace memory

t I

*Refer to paragraph 6.02(4).

Page 49

Page 47

SECTION 501-164-201

$ TABLE I (Contd) 4

TROUBLE ANALYSIS - 2870A1 DIAL

TROUBLI NUMBER

FAILURE

(Co;td)

Cannot dial properly fro m memory

*Refer to paragraph 6.02(4)

ADDITIONAL

SYMPTOM

Party is reached when number is recorded as it is manually dialed. However, when number is subsequently dialed

from memory, party is not reached — wrong number is dialed from

memory

MB7 relay does not

operate (no clicking sound heard ) when

memory button is de-

pressed. No audible

TOUCH-TONE dialing

signal present

MB7 relay operates

(clicking sound heard )

but holds for less than

0.1 second for a 15

digit number

No audible TOUCH-TONE

dialing signal present

Audible gap in tram of

digits being dialed

No digits or random

digits in memory

Number appears to be dialed out correctly but results in “high and dry” conditions or connection to invalid number recording

POSSIBLE

CAUSE

[ncorrect dial contact ;equence

Defective logic Open circuit on PSB Unknown

Did not record properly

Battery not plugged in Open circuit in power

path

Defective logic

Incorrect dial sequence

AC power outage for 24 hours or longer

Disconnected or defective battery

Defective power supply circuit

Switching transients causing line break greater than 300 milliseconds due to incom-

pati bility with switching

REMEDIAL

ACTION

Replace adjunct dial*

Replace memory Replace adjunct dial *

1. Record per paragraph 5.01

2. See Trouble No. 6 Connect battery Check for proper strap lead

connections on PSB See Fig. 11(B)

Replace memory

Replace 35-type dial

Reestablish ac power

rerecord numbers into

memory

Plug in the battery

Allow the battery to be charged for a minimum of 5 minutes. Then remove the power unit from the ac power outlet for 10 seconds and reinsert If previously stored

3. numbers are not dialed from memory, replace the battery

Repeat procedure

Replace adjunct dial*

Consult your Telco

engineer

Page 50

Page 48

$ TABLE I (Contd) ~

TROUBLE ANALYSIS - 2870AI DIAL

1SS5, SECTION 501-164-201

TROUBLE NUMBER

(Co~td)

FAILURE

ADDITIONAL

SYMPTOM

No digits or all

the

same in random mem-

POSSIBLE

CAUSE

Defective memory

Replace memory

REMEDIAL

ACTION

ory locations Two or more memory

locations have same digits which are usually different from originally

Static discharge damage

1. Replace memory

2. Consult Telco engineer for proper grounding procedures

recorded digits Automatically dials

through a WAIT

Memory not securely mounted

Tighten memory mounting screws

Improper connection Check connection to and/or to PSB terminal 26

replace strap to PSB terminal

26 Defective memory Unknown

Cannot dial properly

MB7 relay clicks when

Battery not plugged in

Replace memory

Replace adjunct dial*

Plug in battery

from memory when manual dial is operated off-hook and using but no automatic dialadjunct dial ing possible. RECORD (wired for dial tone lamp does not light. detector only )

MB7 relay does not Precise dial tone may operate (no click heard ) not be present when memory button is depressed

Memory not securely mounted

Make sure precise (350 Hz

and 440 Hz) dial tone is

present

Tighten memory mounting

screws Improper installation Check connections of

of dial tone detector D-180493 installation.

See Fig. 1 ID and Table B

Same as above — Improper connection to Addition of temporary

strap lead between

PSB

or defective memory

1. Check connector cable

2. Replace memory

terminals 19 and 29 does not correct problem

Addition of temporary Defective dial tone Replace D-180493 dial strap lead between PSB detector terminals 19 and 29 corrects problem

Unknown

tone detector

Replace adjunct dial*

10 Speakerphone does not SPO path not completed Check for correct lead

turn on when a memory button is momentarily depressed (wired for ONE-TOUCH option)

With addition of a tem- ONE-TOUCH calling 1. Turn ONE-TOUCH calling porary strap between PSB screw terminals 28 and 29 speakerphone turns on when a memory button is depressed

‘Refer to paragraph 6.02(4).

via proper lead in tele-

assignment in Fig. 8. phone set mounting cord

With 4A speakerphone

Add strap lead between 82B connecting block terminals 10 and 35 on not modified per Fig. 8

switch turned off or

defective

82B

switch on

2. Replace ONE-TOUCH calling switch assembly of D-180493 Kit of Parts

Page 51

Page 49

SECTION 501-164-201

* TABLE I (Contd) ~

TROUBLE ANALYSIS - 2870A1 DIAL

TROUBLE NUMBER

FAILURE

(C~ntd)

11 Speakerphone turns on

but adjunct dial does not automatically dial when memory button is depressed (wired for ONE-TOUCH option)

Delay time between depression

of a mem-

ory button and initi-

ation of automatic dialing exceeds 3 seconds (wired for ONETOUCH option)

13 Cannot turn speaker-

phone off (wired for ONETOUCH option)

ADDITIONAL

SYMPTOM

With addition of a temporary strap between PSB screw terminals 33 and 35, speakerphone turns on when a memory button is depressed

POSSIBLE

CAUSE

Defective connections between dial tone detector and PSB

Defective Line Sensing

Relay PWB Defective dial tone

detector Strap leads from screw

terminals 19 and 26 on store strap leads

PSB were not discon-

netted when option was

wired

Dial automatically dials when screw terminals 19 and 29 on PSB are

temporarily shorted

Speakerphone turns off when OFF button is depressed but turns on when OFF button is released

Precise TOUCH-TONE 1. Check CO line for pre-

service dial tone not

present or a defective dial tone detector

Defective timing circuit

Memory button depressed when TIP & RING disconnected from set

(BK) strap lead from terminal 27 on PSB was store strap lead. not disconnected when option was wired

Speakerphone turns off Defective logic and stays off when (Y-BL) lead is disconnected from terminal 27 on PSB and OFF button is depressed

Speakerphone turns off

Defective circuit on Replace D-180493 dial when handset is taken D-180493 Kit of Parts off-hook but turns on when handset is placed on-hook

REMEDIAL

ACTION

Check (Y-G) and (G-Y) leads to PSB terminals

33 and 34, respectively. Replace Line Sensing

Relay PWB Replace D-180493 dial

tone detector Disconnect, insulate and

sence of precise

TOUCH-TONE service dial

tone (350 Hz and 440

2. If correct dial tone is present, replace D-180493 dial tone detector

1. Replace memory

2. Replace D-180493 dial tone detector

Depress RECORD OFF button

Disconnect, insulate and

Replace memory

tone detector

Hz)

Page 52

Page 50

$ TABLE I (Contd) ~

TROUBLE ANALYSIS - 2870A1 DIAL

1SS5, SECTION 501-164-201

TROUBLE NUMBER

FAILURE

Automatic dialing commences for no

apparent reason

(wired for ONETOUCH option)

Adjunct dials automatically but does not wait for dial tone (wired for ONETOUCH option)

ADDITIONAL

SYMPTOM CAUSE

POSSIBLE

Static discharge damage

Noise on line 1. Add .05 #f capacitor

REMEDIAL

1. Replace memory

2. Consult Telco engineer for proper grounding procedures

between PSB-21 and PSB-26

2. Remove above capacitor and add resistor (10kfJ -

50kf2) in series with a

G-R dial tone detector

input lead

ACTION

Page 53

53 Pages