AT&T BELL SYSTEM Touch-A-Matic 870A1 Instruction manual

i
BEU SYSTEM PRACTICES SECTION 501-164-201
AT&TCo Standard Issue 5, May 1982
870A 1AND 2870A1 “TOUCH-A-MATIC*” 32 AUTOMATIC DIALER
IDENTIFICATION, INSTALLATION, CONNECTIONS, OPERATION
AND MAINTENANCE
,,
CONTENTS PAGE
1. GENERAL ...........
2. IDENTIFICATION .........
A. Design Features .......
B. Optional Features .......
c. Ordering Guide . . . . . . .
D. Operating Features ......
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 . . . . . .
c. Housing Removal .......
4. CONNECTIONS
*Registered Trademark
Company.
.........
1
3
3
3
4
5
5
5
6
8
8
9
12
12
13
13
14
of American Telephone and Telegraph
CONTENTS . ... .
5.0PERATION .........
A. Record aNumber Into Memory
B. Change aNumber In Memory .
c. Delete aNumber From Memory
D. Automatically Dial aNumber
Memory ........
E. LAST NUMBER DIALED Feature
. .
. .
. .
From
. .
. .
F. End-to-End Signaling (2870A 1Only)
6. MAINTENANCE .........
A.
B.
c.
D.
E.
F.
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
(TOUCH-TONEt service) Fig. 1dials.
14
14
15
15
15
15
16
16
16
16
16
17
17
18
on the
2870A1
tRegistered Service Mark of American Telephone and Telegraph
Company.
NOTICE
Not for use or disclosure outside the
Bell System except under written agreement
Printed in U.S.A. Page 1

SECTION 501-164-201
#Warning: This equipment genera tes,
uses, and can radiate radio frequency
energy and if not installed and used in
accordance with the instructions manual,
may cause interference to radio commu-
nications. It has been tested and found to
comply with the limits for aClass Bcom-
puting device pursuant to Subpart Jof
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 aresidential area is
likely to cause interference in which case
the user at his own expense will be re-
quired to take whatever measures may
be required to correct the interference.0
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 awarning 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
(b)
(c)
(d)
1.03
Remove information on D-180837 Kit of Parts
(never manufactured)
Change all references to 95B-type power unit
to 95B1 power unit
Add 87OB2-108, -109 and 287OB2-108. -109
faceplates.
These dials are factory-wired as an adjunct
dialer to provide manual and automatic rotary
/FACEPLATE
Fig. 1—2870A1 Dial
Page 2

1SS5, SECTION 501-164-201
(870A1 )or TOUCH-TONE (2870A1) dialing service
when interfaced with amultiline or nonmodular tele-
phone set or console. For modular single line applica-
tion, 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 aLAST NUMBER DIALED scratch pad memo-
ry.
A. Design Features
2.o2 The following are design features:
●
●
●
●
Integrated circuit memory.
Memory buttons from which to select prepro-
grammed 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.
(c) Dial Tone Detector: Automatically starts
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 acall must be precise TOUCH-
TONE 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
IADDITIONAL
OPTION ITEMS REQUIRED
One-Touch Calling *B180493 Kit of
=“:0’18”t0f
CONNECT 870A1 PER
5c
CONNECT 2870A1 PER I
FIG. ]TABLE I
llB, D, EI I
XG--lB
5c
*Associated telephone set must be equipped with 3B (MD) or 4A speakerphone system.
tAdjunct diaf must be equipped with an 870B or 2870B Memory when this kit is
provided.
Page 3

SECTION 501-164-201
previously stored numbers. No recording possi-
ble except for LAST NUMBER DIALED mem-
ory 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 with-
out having to depress the RECORD OFF but-
ton.
(b) Disables the LAST NUMBER DIALED
feature.
2.04 All options are implemented by the following.
●Wiring changes in the applicable dial.
●Wiring changes in the telephone set or con-
sole to which the dial is an adjunct.
●Installation of appropriate additional items.
C. 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) of
2.07
(a)
(b)
(c)
(d)
Note: One power unit is required for each
adjunct dial.
●Decorative Faceplate, see paragraph 2.09.
The 870A1-50 dial may be ordered in its com-
ponent parts as follows:
Housing, Lower, 870ADJ1-50
Housing, Upper, 870A1U-50
Faceplate, 870B1-122 (Matte Aluminum)
841382575 Dial Base (includes the following):
●
●
●
●
●
●
●
●
●
2.08
(a)
(b)
(c)
(d)
●
●
●
●
●
●
●
●
●
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
The 2870A1-50 dial may also be ordered in its
component parts as follows:
Housing, Lower, 870ADJ1-50
Housing, Upper, 870A1U-50
Faceplate, 2870B1-122 (Matte Aluminum)
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:
●Housing, Lower, 870ADJ1-(see Note 1)
Page 4

D.
2.1
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 ex-
cept 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.
Operating Features
OOperating features (Fig. 1) are as follows.
●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 but-
tons.
●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.
●
●
1SS5, SECTION 501-164-201
and enables the memory circuits to store tele-
phone 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 momentar-
ily depressed during recording operation,
enters acode into memory to initiate ahalt
in the automatic dialing sequence [used
where access digit(s) required].
3. INSTALLATION
STANDARD INSTALLATION
3.01
Warning: Do not plug in either battery
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.
Connect the adjunct dial to the telephone set
using the D10U~87 or D1OY-5Omounting cord.
Refer to Fig. 6and 7for basic interface connections
and to Tables Dthrough Gfor specific connections.
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: For safety, securely attach
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 at-
tempting attach or remove the retaining
clamp. This will prevent the possibility yof
aloosened retainer clamp or metallic
outlet cover making contact with the ac
prongs of the power unit when partially
withdrawn from outlet. Do not use re-
taining clamp on outlets where the cover
Page 5

SECTION 501-164-201
mounting screw holds the duplex outlet
in the box.
Danger 2: Care should be taken to trim
and dress leads connecting to 10wvoltage
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 amultiple re-
ceptacle power strip, there must be at
least one inch separation between power
units. Only UL listed receptacle power
strips with adequate power rating shall
be used. Use of acontinuous 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.
3.03 Connect the M2SL-87 power cord to the power
unit and plug the power unit into an ac outlet
not controlled by aswitch (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 apotential 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 1Dial
3.05 Check the 870A1 (rotary service) dial as fol-
lows.
RECORD LAMP
...-—
DIRECTORY
‘HEET4
CAPTIVE
HOUSING
SCREW (41 ,r%)
.-
J
-1
.,. --,------
01~,.&lp . . - --
II
t
INSTRUCTION
LABEL
COVER- WITH
LOWER DETAIL
REMOVED
COYER SCREW
.#=’lTl D-18081E3
KIT OF PARTS
A-.
‘a m-w (OPTIONAL)
.. —...-. -—-----—-- ——-—”— -—.- 4
i.. —-. ---- ._.-—. ----
Fig. 2—2870A 1Dial, Faceplate Removed
Page 6

1SS5, SECTION 501-164-201
(1) Check operation of line sensing circuit per the
following tests. (Refer to Part 5for operation. )
In case of failure, refer to Table H(Trouble Analy-
sis).
(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.
(c) After dial tone is heard again, manually
dial digit O.One of the following audible sig-
nals will indicate how the dial meets the re-
quirements 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 num-
bers in sequential memory locations. Fill all mem-
ory 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.
(6) Go off-hook and use the dial on the adjunct to
record aknown telephone number into mem-
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 aknown telephone number.
Note: If apause for second dial tone is re-
quired, dial the access digit(s). After the RE-
CORD 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 astored WAIT input. Depress the
LAST NUMBER DIALED button again and the
remaining digits should be dialed.
K
RThe battery and power unit must be
connected aminim urn of five min-
utes before doing Step (10).
(10) Momentarily disconnect the power unit (for
5to 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 detect-
ed, and the stored number should be automatically
dialed.
2870A1 Dial
3.06 Check the 2870A1 (TOUCH-TONE service)
dial as follows.
(1) Check operation of the line sensing circuit per
the following tests. (Refer to Part 5for opera-
Page 7

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 1through
Oin consecutive memory locations, storing one
digit per memory. Fill all memory locations except
LAST NUMBER DIALED and the memory loca-
tion 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 loca-
tion 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 manu-
ally dialing digits 1through Ointo the test circuit.
(5) Momentarily hang up handset and then auto-
matically redial the test circuit number re-
corded in Step (4) by depressing button
immediately above LAST NUMBER DIALED but-
ton and proceed as follows:
(a) Depress LAST NUMBER DIALED button.
Digits 1through Owill be automatically
dialed into test circuit. Verify that correct sig-
nal is returned from test circuit.
(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.
K
RThe battery and power unit must be
connected aminim urn of five min-
utes before doing Step (c).
(c) Disconnect the power unit from the ac out-
let. With the handset off-hook and using the
telephone set dial, manually dial aknown num-
ber to check that the telephone set operates cor-
rectly.
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, de-
press 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
A. D-180493 Kit of Parts (Dial Tone Detector and One-
Touch Calling Switch)
3.07
(1)
(2)
Install as follows.
Remove the housing (paragraph 3.11)and ac-
cess PSB terminal board (paragraph 3.09).
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.
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 8

1SS5, SECTION 501-164-201
(7) Verify correct operation of option. (1) Remove faceplate (paragraph 3.10)
(8) Reassemble. (2) Loosen the captive screw at the bottom of the
cover around the dial and remove the cover
B. D-1808 18 Kit of Ports (Record Disable and Dial lnter- (Fig. 2).
mix Feature) (3) Disengage dial from chassis (paragraph 6.05
3.08 Install as follows. or 6.06).
Fig. 3—2870A1 Dial, Dial and Memory Removed to Show Terminal Area
Page 9

SECTION 501-164-201
Mh$l L
;~s FOR
809!8 KIT
PARTS
=MEMORY
“AI L-
‘0 R
SWITCHES
Fig. 4—2870A 1Dial, 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-
(5) Rotate the left edge of the Memory upward as gether. (The one-touch calling option can no
shown in Fig. 4longer be disabled by the subscriber. )
Note: If existing memory is 8’70A or 2870A, it
must be replaced with 870B or 28’70B, respec- (7)
tively. Carefully repack existing memory to en-
sure recovery.
(8)
(6) Mount switch below dial with the two scre;vs
pro~’ided,
Connect switch lead connectors to terminal
posts on memory board per T:ihle C.
Set FE,ITURE s~vitch to OFF position and
v(’rify that ~lia] operates in normal manner.
Note: If the one-touch calling s~vitch (D- ..Nomh’rs tan be recorded into memory
Page 10