AT&T 2870A1 Identification, Installation, Connections, Operation, And Maintenance
i
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
1
3
3
3
4
5
5.0PERATION . . . . . . . . .
Record a Number Into Memory
A.
B. Change a Number In Memory .
Delete a Number From Memory
c.
Automatically Dial a Number
D.
Memory . . . . . . . .
E. LAST NUMBER DIALED Feature
. . .. .
. .
. .
. .
From
. .
. .
14
14
15
15
15
15
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 . . . . . . .
c.
4. CONNECTIONS
. . . . . . . . .
12
12
13
13
14
5
5
6
8
8
9
F. End-to-End Signaling (2870A 1 Only)
6. MAINTENANCE . . . . . . . . .
Trouble Analysis . . . . . . .
A.
Battery . . . . . . . . . .
B.
Memory . . . . . . . . . .
c.
Dial . . . . . . . . . . .
D.
line Sensing Relay Printed Wiring Board
E.
Assembly . . . . . . . . .
F.
Faceplate (conversion from 870A2 or
2870A2 to 870B1 or 2870B1 ) . .
1, GENERAL
1.01
This section contains information
870A1
(rotary)
and
the
16
16
16
16
16
17
17
18
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
Page 1
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
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.
(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 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
I
OPTION
One-Touch Calling *
ADDITIONAL
CONNECT 870A1 PER
ITEMS REQUIRED
B180493 Kit of
CONNECT 2870A1 PER
FIG.
llB, D, E
XG--lB
5
c
5
=“: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.
I
] TABLE I
I I
c
Page 3
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
C.
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
of
●
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)
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
3.
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.
D.
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
Page 5
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-
at
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.
-
1
DIRECTORY
‘HEET4
CAPTIVE
HOUSING
SCREW (41 ,
%)
.-
r
J
i
.. —-.
.,. --,------
01~,.&lp . . - --
A -.
.. —...-. -—-----—-- ——-—”— -—.-
---- .
Fig. 2—2870A 1 Dial, Faceplate Removed
‘a m-w
.#=’lTl
_.-—.
t
----
II
4
INSTRUCTION
LABEL
COVER- WITH
LOWER DETAIL
REMOVED
COYER SCREW
D-18081E3
KIT OF PARTS
(OPTIONAL)
Page 6
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.
(c) After dial tone is heard again, manually
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.
R
The battery and power unit must be
connected a minim urn of five min-
utes before doing Step (10).
K
(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
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
A.
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.
R
The battery and power unit must be
connected a minim urn of five minutes before doing Step (c).
K
(c) Disconnect the power unit from the ac out-
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.
1SS5, SECTION 501-164-201
Verify correct operation of option.
(7)
(8) Reassemble.
D-1808 18 Kit of Ports (Record Disable and Dial lnter-
B.
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
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
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
+
+
S2
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
11
1206 I - I * 126 / * I * ]
.
TERM. FOR
DIAL TONE
ONLYt
*
ONE-TOUCH
CALLING
*
* *
2
2 16
REMOVE
FROM
PsB
19
295
7 7
G-R 16 16 17 17
o-Y
Y-G
Y-BL
BK-O
O-R
s
s
11
*
*
20 20
*
22 22
*
*
11
13
17
18
19
21
23
20
15
19 19
*
21
*
24
29
*
25 25
26 26 “
*
*
ONE-TOUCH
CALLING
*
*
16
33
21
2’7
24
29
34
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
f.
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-
ry
. 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-
(1) Record lamp will not light when RE-
CORD button is depressed.
CORD button is depressed.
Page 11
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
A.
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
TABLE C
CONNECTIONS FOR D-180818 KIT OF PARTS
I
1SS5, SECTION 501-164-201
D-KIT
I
(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
B.
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
I
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).
I
1
2
3
MD
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
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
5.
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
(c) Using the adjunct dial, manually dial the
telephone number.
Note: A number up to 15 digits in length may
be recorded. The RECORD lamp will go out
1SS5, SECTION 501-164-201
I
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
B<
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
c.
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.
E.
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
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