Bell System Practices TOUCH-A-MATIC TOUCH-TONE Dial 2872A2M Identification, Installation, Connections, Operation, And Maintenance

BELL SYSTEM PRACTICES
AT&TCo Standard
2872A1M
SECTION 503-603-101
Issue 5, October 1980
OR 2872A2M
"TOUCH-A-MATIC
IDENTIFICATION,
®'' TELEPHONE SET
INSTALLATION, CONNECTIONS,
OPERATION, AND MAINTENANCE
CONTENTS
1.
GENERAL
2.
IDENTIFICATION
3.
PAGE
...........
Design Features
B.
Optional Features
C.
Ordering Guide
D.
Operating Features
INSTALLATION
.......
......
.......
D.
......
B.
Mounting Cord
C.
Network Terminals
D.
Power Supply (PSB) Terminals
E.
Line Key Removal
......
18
F.
Faceplate Removal
......
18
G.
Handset Cradle Removal
H.
Housing Removal
.........
.....
Kit of Parts
..........
.
.
.
8
.
10
15
.
.
15
....
18
.......
18
4.
CONNECTIONS
5.
OPERAI_ION
.........
19
..........
19
A.
Record A Number Into Memory
B.
Change A Number In Memory
C.
Delete A Number From Memory
D.
Automatically Dial A Number
Memory
..........
.
19
.
20
.
20
(With
10
10
.
From
20
(2/4-Wire
11
E.
Single Line Service
13
F.
•
Head Telephone Set
6.
LOCATION
......
7
11
.........
14
7
D-180818 Kit of Parts (Record Disable
and Dial Intermix Features)
. . .
INFORMATION
.......
6
D-180493 Kit of Parts (Dial Tone
Detectorand One-Touch Calling Switch)
.............
COMPONENT
13
4
D-180492
Kit of Parts
Speakerphone)
........
D-180494
Service)
....
3
OPTIONAL APPARATUSINSTALLATION
C.
Location of Components
3
Installation Check Procedure
B.
A.
3
STANDARD INSTALLATION
A.
PAGE
2
.........
A.
CONTENTS
......
.....
AND
E.
LAST NUMBER DIALED Feature
F.
End-to-End Signaling
MAINTENANCE
.....
.........
.
.
20
21
21
A.
Trouble Analysis
.......
21
B.
Battery
..........
22
C.
Memory
..........
22
13
ACCESS
13
NOTICE
Not for use or disclosure outside the
Bell System except under written agreement
Printed in U.S.A.
Page 1
SECTION 503-603-101
CONTENTS
D.
Dial
E.
6-Button Line Key
F.
Ringer
G.
Buzzer
H.
Handset Jack
h
Handset
J.
Faceplate
K.
Speakerphone
PAGE
...........
1.02
This section
22
. Revise Table
22
• Add Fig. 6
..........
23
• Add safety
unit
..........
23
......
is reissued
A
information
• Add 533K diode
1.
........
24
Dial)
restriction
.....
........
• Add 2012D transformer
24
• Show
2012B transformer
• Show
3B speakerphone
MD
25
MD
GENERAL
1.03
1.01
for dial
for the 95B1 power
23
..........
....
to:
This section contains
information
on the
2872AIM (MD)or 2872A2M (TOUCH-TONE ®
TOUCH-A-MATIC
telephone
set (Fig. 1).
HANDSET
The 2872AIM (MD) or
set is factory-wired
for
or 6A key telephone
systems
be converted
(Table J) for use
2872A2M
use with
(KTS).
with 1A
telephone
1A1, 1A2,
They may
KTS.
MEMORY
35-TYPE
DIAL
HOUSING
(LOWER)
HOUSING
(UPPER)
H4DU
CORD
FACEPLATE
Fig. 1--2872AIM
Page 2
(MD) or 2872A2M Telephone Set
ISS 5, SECTION503-603-101
1.04
1.05
1.06
The telephone sets
following colors:
are
available
in the
• Polarity guard (removable
application)
for dry circuit
• Black (-03)
• Common audible ringing
• Green (-51)
• Buzzer
• White (-58)
• Busy lamp diode
• Lt. Beige (-60).
• Line pickup buttons convertible to nonlocking
signal buttons
The 2872A1 (MD) faceplate is available
satin-silver (-87) color only.
in
• Memory buttons from which to select
preprogrammed
telephone numbers for
automatic dialing
The 2872B1decorative faceplates are available
in the following colors:
• Capability to record and automatically dial
31 telephone numbers of up to 15 digits
each
• Teak Woodgrain (-108)
• Walnut Woodgrain (-109)
• Last number manually dialed memory
• Matte Aluminum (-122).
• Plug-in battery
2.
IDENTIFICATION
• Capability to pause for subsequent dial
tones during automatic dialing (WAIT input)
2.01
The 2872AIM or 2872A2M telephone set
provides all standard features of a 6-button
key telephone set plus (manual) TOUCH-TONE
dialing, automatic dialing of 31 frequently called
numbers, and a LAST NUMBER DIALED scratch
pad memory.
• End-to-end
B.
signaling for data application.
OptionalFeatures
2.02
The 2872A2M telephone set differs from
the 2872AIM set only in the battery circuit.
The 2872A2M set has a battery interlock circuit
that prevents the set from dialing automatically if
the battery is not plugged in. Also, the 2872A2M
telephone set utilizes a newly coded battery
(KS-20390L4) which can not be used in the 2872AIM
set.
2.04
Optional
Features
(Refer
to Table
A):
• Speakerphone--either
$3B (MD)¢ or 4A
speakerphone
systems may be added to
stations
• Dial Tone Detector--automatically
starts
dialer when precise TOUCH-TONE dial tone
(350 Hz and 440 Hz) is present.
A.
2.03
DesignFeatures
Design
Features:
• Modular key telephone set
• One-Touch Calling, (requires both dial tone
detector and speakerphone)--depressing
one
memory button will automatically turn on
speakerphone, detect dial tone, and dial
complete number.
• Integrated circuit RC TOUCH-TONE oscillator
• Integrated
circuit memory
• Surge protector
Note:
All dial tones encountered in the
process of placing a call must be precise
TOUCH-TONE dial tone if the call is to be
completed automatically.
Page 3
SECTION 503-603-101
• IPD-180818 Kit of Parts
features.
provides
the following
C.
Ordering Guide
2.06
Note:
Telephone
2870B memory.
set must
be equipped
Ordering
Guide:
with
(a)
(a)
Record
Disable--turns
off recording
feature
to prevent accidental
erasures
of previously stored numbers.
No recording
possible
except
for last number
dialed
memory which will store digits manually
dialed from the telephone
set.
The 2872A2M telephone
set is a modular
type telephone
set and may be ordered
complete and ready to install as:
• Set, Telephone,
(b)
Note:
One power
telephone
set.
• Decorative
Woodgrain)
(c)
Busy Lamp
• 2/4-Wire
Service
(busy lamp
diode wired
Separately.
• Unit, Power, 95B1 (required
for operation
of the automatic
dialing feature).
(b) Record
Disable
and Dial Intermix
Feature--digits
dialed manually
from
the telephone
set dial and digits dialed
automatically
from
memory
may
be
intermixed
without
depressing
RECORD
OFF button.
Memories
cannot be altered
and LAST NUMBER DIALED
feature
is
inoperative.i
• Station
in set)
Ordered
Lower,
• Housing,
Upper,
2872B1 faceplate)
• Exclusion
• Faceplate,
Hold
Ringing
• Restricted
of the following
870A1-*
870AIU-*
(used
(matte
only with
aluminum)
G15A-*
• Cord, Handset,
• Bridged
for each
2872B1-108
(Teak
(Walnut Woodgrain).
2872B1-122
• Handset,
• Signaling
is required
Faceplate,
or2872Bl-109
• Add-On-Conference
• 'T'
unit
The 2872A2M set is comprised
component
parts:
• Housing,
(multiline)
2872A2M-*
• Base, Telephone
following):
H4DU-*
Set, 2872A2M
(includes
Dialing
Dial,
• Amplifying
Handset
• Decorative
Faceplate
35AG3A
Key, 635BT5
812365039
• Head
telephone
set operation
using jackset.
Ringer,
AII
options
are
implemented
changes
in the telephone
Page 4
of appropriate
or 4228-type
KS-20419L1
set
Cord,
• Installation
425K (MD)
by:
Buzzer,
• Wiring
Collar
PIB
Network,
2.05
(P-23F503)
additional
items.
Mounting,
*Add appropriate
D50BB-87
color suffix (paragraph
1.04).
the
ISS 5, SECTION
$ TABLE
503-603-101
A 0
OPTIONS
,
,
|
i
,
,
,
, , ,,
,
CONNECTION PER
OPTION
ADDITIONAL
ITEMS REQUIRED
FIGURE
, ,
, , , ,
,
,
,
,,
4A
,
,
, , , , ,
, ,
,, ,
,
TABLE
,
,
108AA
Loudspeaker
12
D, E
680AE
Transmitter
12
D, E
12
D, E
12
D, E
9(C)
D, E
760A (MD) Loudspeaker
11
B, C
666B (MD) Transmitter
11
B, C
11
B, C
11
B, C
82B Connecting
Block
85B1 Power Unit
D-180492
Kit of Parts
Speakerphone*
55-Type
(MD) Control
Unit
3B (MD)
2012D
Transformer
149B Adapter
One-Touch
Calling
B, C
D-180492
Kit of Parts
9(C)
D-180492
Kit of Parts
9(D, E)
.¢
C, E
Speakerphone
Dial Tone
Station
"I"
Detector
D-180493
9(B)
Kit of Parts
9(D)
Busy Lamp
C, E, F
10
Hold
10
Signaling
H
Exclusion
(Multiline)
10
Ad d- On-C on fere nce
10
Amplifying
Handset
G6BM, O7BM, or G8BM Handset
2/4 Wire Service*
Dry Circuit
(without
D-180494
Polarity
9(H)
Kit of Parts
13
Guard)
Dialing
Bridged
Ringing
Record
Disable
G
9(B)
1A Key Service
Restricted
D, E
J
533K Diode,
Capacitor
(_.
5MF)
14
L, M
D-180818
Kit of Parts
(See Note
1)
K
Dial Intermix
Page
5
SECTION 503-603-101
,
$ TABLE A (Contd) e
OPTIONS
--
,
,, , ,
, ,
,
,, ,
,
,,
,,,
,
,, , ,
,
,
,,,,
,
,
,
CONNECTION
OPTION
ADDITIONAL
ITEMS
REQUIRED
FIGURE
,,, ,, , , , , ,,,
,,, , ,, ,
, ,, ,
, ,, ,
,
,,,
,,,
,
,
,,
PER
,
TABLE
,
,
2872B1-108 (Teak Woodgrain)t
Decorative Faceplate
2872B1-109 (Walnut Woodgrain)t
Plantronics Jackset Model
JS0180-1A or JS0180-2A
Tables provided with
Plantronics Jackset
Head Telephone Set Operation
I
Desired Head Telephone Set
.
. ,,,,,, ,
. ,,.
.
.
.
.
,, ,
Note 1. If set is equipped with the 2870A memory, replace with a 2870B memory.
Note 2. Set must be equipped with 4228-type network.
* D-kits for 2/4-wire service and speakerphone are designed to mount in the same place in the set. If both services
are to be provided simultaneously, consult your Telco engineer.
An 870A1U- upper housing may be required(paragraph
6.11).
The KS-19796, KS-20778, 52o, 53-, and 60-type headsets
are
registered
Battery, KS-20390L2 [may be used in either
2872A1M (MD) or 2872A2M sets]
• Kit of Parts, D-180818 (Record
Dial Intermix)
Battery,
Note:
This kit of parts may be used only
with sets equipped with a 2870B memory
Jack,
KS-20390L4
Handset,
(2872A2M
sets
only)
and
2872Bl-t
2870B
840393581
Power
Supply
Printed
Wiring
Board (PSB) Assembly [2872AM (MD) base]
Note:
If set is equipped
with
2872A1-87
faceplate,
then an upper housing (870AIU-*)
of the appropriate
color must also be ordered.
841382658
Power Supply
Printed
Wiring
Board (PSB) Assembly
(2872A2M base)
• Handset,
G8BM)
840393672
• Set, Head Telephone [using Plantronics Jackset
Model JS0180-1A (1-1/2 foot cord) or JS0180-2A
(6 foot cord)].
Directory
Booklet,
Instruction,
Optional
Apparatus
Sheet
Set
Subscriber,
(order
SIB-2455B
D-180492
service)
• Kit of Parts, D-180493
and One-Touch Calling
• Kit
of Parts,
4-wire
service)
D-180494
(must
be used
(G6BM,
G7BM,
(Dial Tone Detector
switch)
conversion
Operating Features
for
2.07
(for
Amplifier
as required):
D.
• Kit of Parts,
speakerphone
Page 6
Disable
616B
• Faceplate,
Memory,
(d)
with the Jackset Models.
Operating
Features
• Dial (TOUCH-TONE
(Fig.
2):
dial).
• Add appropriate
color suffix (paragraph
1.04).
_Add appropriate
color suffix (paragraph
1.06).
to
and
ISS 5, SECTION 503-603-I01
• Line key (635BT5), 6-button key. Hold with
five line pickup buttons which are convertible
to nonlocking.
An additional
momentary
contact (logic reset switch) is attached
to
the Hold side of the key to reset the logic
circuit anytime a key button is depressed,
• 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, automaticallyredials
the last number manually
dialed,
• RECORD button (nonlocking), when momentarily
depressed,
lights the RECORD
lamp 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),whenmomentarily
depressed during recording operation,
enters
a code into memory
to initiate
a halt in
the automatic
dialing sequence [used where
access digit(s) required],
3.
INSTALLATION
STANDARD INSTALLATION
3.01
Make all wiring changes and telephone
set
modifications
(Table
A) before
external
connections
are made to the set (paragraph
4.01).
Warning:
Do not plug in either
battery
or power
unit
until
all connections
and modifications
are completed.
Take
extreme
care
not
to damage
the
exposed
components,
circuit,
etc. when
the set is opened,
3.02
The set is shipped from the factory
with
the battery
disconnected.
After all wiring
changes and modifications
have been completed,
connect the battery
(Fig. 7) by tilting the set up,
and inserting
the battery plug into the mating jack.
Note:
Write date
provided on battery.
of
installation
on
label
3.03
Install the 95B1 power unit within 150 feet
(24 gauge conductors)
of the telephone
set
and plug into an ac outlet not controlled by a switch
(continuous
ac power is required).
A retaining
clamp (841050818) will be shipped with the 95B-type
power
unit and should be mounted
to the ac
receptacle
to hold power unit securely and prevent
accidental
loss of power.
The power unit may be
located at the equipment
end of the cable or run
directly
into the telephone
set by conductors
separate
from the mounting cord and connected to
PSB terminals
30 and 31.
Refer to applicable
tables and Fig. 8 for particular
type of installation.
When separate power conductors are used, disconnect,
insulate, and store the (BL-V) and (V-BL) mounting
cord leads from PSB terminals
30 and 31.
Danger:
Securely
attach
retaining
eIamp
to ae outIet
using
outlet
cover
screw
BEFORE
attempting
to instaIl
95B1
power
unit.
OThe
power
unit
and
any
other
cord
plugged
into
the
ae outlet
should
always
be unplugged
completely4
from
the outlet
BEFORE
attempting
to attach
or remove
the
retaining
clamp.
This
will
prevent
the possibiIity
of a loosened
retainer
clamp
or metallic
outlet
cover
making
contact
with
the
ae prongs
of
the
power
unit
when
partially
withdrawn
from
outlet.
Do not
use
retaining
clamps
on outlets
where
the
cover
mounting
screw
holds
the duplex
outlet
in the box.
SWarning:
Care
should
be taken
to
trim
and
dress
leads
connecting
to
low
voltage
output
terminals
of 95B1
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
a multiple
receptacle
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
a
continuous
terminal
power
strip
that
allows
the secondary
output
terminals
of
the
power
unit
to
be in
close
Page 7
SECTION 503-603-101
CORD
MOUNTING
J
655-TYPE
KEY
COVER
INSTRUCTION
LABEL
LINE SWITCH
PLUNGER
COVER
SCREw
HANDSET
CRADLE
DIRECTORY
SHEET
DETAIL REMOVED
WHEN
D-180493
OR D-180818
KIT OF PARTS IS
CAPTIVE
HOUSING
SCREW
(4)
Fig. 2--2872A2M
proximity
to
recommended.Q
the
ac
line
Telephone Set--Faceplate
source
is
not
Note:
The 95B1 power unit must be located
no closer than 1-1/2 feet from the telephone
set in order to prevent a noise problem.
3.04
The station
(P-25ES03)
the dial.
3.05
The
number card retainer
812558039
snaps into the faceplate
below
directory
sheets
(Fig.
2) fit
over
To designate
6obutton key.
(1) Use Form
the
buttons
Page 8
the
tabs.
(4) Replace the caps so that
side of caps fit into small
buttons.
Installation Check Procedure
3.07
Check telephone
set installation
per the
following tests(referto
Part 5 for operation).
In case of failure, refer to Trouble Analysis, Table
N.
(1)
Disconnect the power unit and manually dial
a known telephone
number
to check that
the telephone
operates
correctly
in the absence
of commercial
power.
(2)
(3)
key
small bumps on
holes on sides of
635-type
5837 tabs.
(2) Squeeze the sides of the
gently and remove,
(3) Insert
of the
and Handset Removed
the
buttons of the memory and are held in place
by the faceplate.
Additional
sheets are available
in the directory
sheet set, 840393672.
3.06
INSTALLED
button
caps
Reconnect
the power
unit
to ac outlet.
With handseton-hook,
record digits 1through
0 into consecutive memory locations, storing
one digit per memory.
Fill all memory locations
except LAST NUMBER DIALED
and location
immediately
above
it [paragraph
5.01 (4)
through
(7)].
ISS 5, SECTION 503-603-101
KEY
TABS
..............
"
TERMINAL
B0 A R D T B 2
L:_,_:
:_i::'.
LINE SWITCH
ASSEMBLY
TERMINAL
BOARD
PIB
TBI
RINGER
BUZZER
MOUNTING
SCREW
:_.:; •
616B
JAC
ATTACH
STAYBAND
OF NONMODULAR
HANDSET
CORD
KS-20419
Fig. 3--2872A2M
LI
BUZZER
Telephone Set With Faceplate, Handset, Handset Cradle, and Upper Housing Removed
Page 9
SECTION 503-603-101
(4) Manually dial CO dial test and ringer circuit
and simultaneously
record
into memory
location
immediately
above LAST NUMBER
DIALED button [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 0 into the
test circuit,
(5) Momentarily hang up handset and automatically
dial the test circuit number recorded in Step
(4) by depressing
button
immediately
above
LAST NUMBER DIALED
button
and proceed
as follows.
(9) 0Go off-hook and manually
dial a known
telephone number with a WAIT input inserted
in the telephone
number.
(10)
Momentarily
hang up the handset and then
automatically
dial the number by depressing
the LAST NUMBER DIALED button.
The set
should stop dialing when it reaches the stored
WAIT input.
Depress
the LAST NUMBER
DIALED button again and the remaining
digits
should be dialed._
OPTIONAL APPARATUS INSTALLATION
A.
(a)
Depress
LAST NUMBER
DIALED
D-180492 Kit of Parts (With Speakerphone)
button.
Digits 1 through 0 will be automatically
dialed into test circuit.
Verify that correct
signal is returned
from test circuit.
3.08
To install.
(1)
Proceed
(b) Momentarily
depress the memory buttons
used in Step (3) in the same sequence in
which the digits were recorded.
Verify that
(2)
Make connections
B through E.
correct
signal is returned
from
after each series of numbers,
(3) Mount the kit assembly to the chassis with
the screws provided (Fig. 4). Beveled corner
of printed wiring board (PWB) should be located
test
circuit
be connected
a minimum
of five
minutes
before
doing
Step
(c).
The battery
and the power
unit must
Momentarily
disconnect
the power unit
(for 5 to 10 seconds).
After reconnecting
power unit, depress
a memory
button
of a
as described
in paragraph
per the appropriate
3.16.
Tables,
lower right
B. at D-180493
Kit corner.
of Parts (Dial Tone Detector and
One-Touch Calling Switch)
(c)
memory
retention
location used
of memory,
(6) Dial the appropriate
test the ringer,
in Step
(3), to verify
code for ring-back
to
(7) Check operation
of the logic reset switch
by pressing the RECORD button (RECORD
lamp will come on) and subsequently
pressing
an unoperated
line button.
The RECORD lamp
must go out.
(8) 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 (4). The speakerphone
should turn on, dial tone should be detected,
and the stored number should be automatically
dialed.
Page 10
3.09
To install.
(1) Remove the housings (paragraph
3.21), and
access PSB terminal
board (paragraph
3.17).
(2)
Insert the board assembly from the back of
the set and locate as shown in Fig. 4, such
that the two tabs on the board assembly fit into
the slots in the bottom of the chassis.
(3) Lock the board
the self-threading
side of the chassis.
into position
by inserting
screw through
the right
(4) Mount the one-touch
calling
the dial with the two screws
Note:
If switch
for D-180818
switch below
provided.
Kit
of Parts
is already present, the one-touch calling switch
can not be installed.
The PSB terminal where
the switch leads should be connected
(Table
C or E) shall be strapped
together.
(The
ISS 5, SECTION 503-603-101
D-180492
KIT OF
PARTS {OPTIONAL)
NETWORK
CAPTIVE MEMORY
MOUNTING SCREWS
MOUNTING HOLES FOR
D-180492
OR D-180494
KIT OF PARTS (OPTIONAL)
PARTS
KIT OF
{OPTIONAL)
TERMINAL
55-TYPE
ONE-TOUCH CALLING
CAPTIVE MEMORY
MOUNTING SCREWS
Fig. 4--2872A2M
one-touch calling option
by the subscriber.)
(5) Make
(6)
connections
per Table
correct
(8) Reassemble
operation
set.
off
(2) Make
connections
per Table
G.
(3) Mount the kit assembly to the chassis
the screws provided (Fig. 4).
D.
with
D-180818 Kit of Parts (Record Disable and Dial
Intermix Features)
3.11
To install.
(1) Remove
Service)
SWITCH OF D-180493
Removed To Show Terminal Area
C, E, or F.
of the option.
D-180494 Kit of Parts (2/4-Wire
3.10
Telephone Set--Dial
be turned
DIAL
KIT OF PARTS OR FEATURE SWITCH OF
D--180818 KIT OF PARTS (OPTIONAL)
Break off the detail at the bottom of the
cover (Fig. 2) and trim edge as required.
(7) Verify
C.
cannot
AREA
faceplate
(paragraph
3.19).
(2) Loosen the captive screw at the bottom of
the cover around
the dial and remove the
cover.
To install.
(1) Proceed
as described
in paragraph
3.17.
(3) Disengage the four captive
screws (Fig. 4).
memory
mounting
Page 11
SECTION 503-603-101
•.
MEMORY
LOGIC
RESET
SWITCH
CONNECTION PINS
FOR D-180818
KIT OF PARTS
BATTERY
JACK
P OW ER S U PPLY
•
Fig. 5--2872A2M
(4) Disengage
the two captive
screws and move dial aside,
(5) Rotate
shown
Note:
Memory,
carefully
according
dial
left edge of the memory
DIAL
CONNECTOR
Telephone Set, Internal View, Overall
mounting
upward
strapped
together.
(The one-touch
calling
option can no longer be turned off by the
subscriber.)
as
by Fig. 5.
If
set
is
(7)
equipped
with
replace it with 2870B
pack and return
the
to local procedures.
CONNECTOR
Connect
terminals
switch
lead connectors
to
on memory board per Table
post
K.
a 2870A
Memory and
old memory
(8) With feature switch in OFF position,
that set operates
in normal manner:
• Numbers
can
be recorded
• Numbers
can
be changed
• Numbers
can
be deleted
into
verify
memory
(6) Mount switch below dial using the two screws
provided
(Fig.
4).
Note:
If the one-touch calling switch (D-180493
Kit of Parts)
has been provided, it must be
removed.
The PSB terminals
where the switch
leads were connected
(Table C or E) must be
Page 12
(9) Set feature switch
feature
provided.
from
to ON position
memory.
and verify
ISS 5, SECTION 503-603-101
• Record
(a)
disable
feature,
RECORD
RECORD
lamp
button
(b) No telephone
changed,
(c)
only.
will not light
is depressed.
numbers
or deleted
when
Remove
(2)
Access
(3)
Remove
disable
DIALED
feature
is
and dial intermix
RECORD
record
lamp
button
will
not
light
is depressed.
(d)
LAST NUMBER
disabled.
_
DIALED
feature
E.
Single Line Service
The 2870A2M
set is available
line set. However, the
telephone
sets may
service as follows.
A.
Reassemble
TOUCH-A-MATIC
telephone
from the factory as a single
2872AIM (MD) and 2872A2M
be converted
to single line
head telephone
The components
as follows.
Under
the
(2)
Gain access
3.17).
key collar,
key.
and
(3)
Remove
(4) Make
the cradle
connection
all
area
(paragraph
per Table
• Handset
cradle
in three
(Fig.
areas
3):
assembly
jack
boards
Under the
and 5):
(TB1 and TB2).
faceplate,
inside
the
set
(Fig. 4
3.20).
• Battery
jack
• Power
supply
(Fig.
5)
L.
(PSB)
terminal
area
(Fig. 4)
a 2870B1 faceplate
• Network
(Fig. 4)
• Options
(Fig. 4):
D-180492
3.13
located
(paragraph
Note:
If set was originally equipped with a
2872A1-87 faceplate,
refer to paragraph
6.11.
F.
set plug into jackset.
• Ringer
(b)
(5) Reassemble
set and install
of the appropriate
color.
set.
• Buzzer
• Terminal
terminal
are
handset
• Line switch
Remove the faceplate,
buttons of the 635-type
to
telephone
hole in rear of
per appropriate
Jackset.
Location of Components
(a)
(1)
3.20).
COMPONENT LOCATION AND ACCESS INFORMATION
set.
3.12
(paragraph
3.17).
is
Manually and automatically
dialed digits
may be intermixed
(paragraph
5.07).
Reassemble
(paragraph
Other
optional
components
may be
used such as SPOKESMAN
_ loudspeaker
sets,
etc.
Refer
to the appropriate
section
for connection
information
for these
components.
3.14
(10)
cradle
area
when
(b) No telephone numbers can be recorded,
changed, or deleted in memory,
(c)
PSB terminal
3.21).
features.
(6) Insert
(a)
(paragraph
(4) Thread jackset cord through
housing and make connections
table provided with Plantronics
(5)
• Record
housing
can be recorded,
in memory.
LAST NUMBER
operative.
(1)
(relay
kit for speakerphone)
Head Telephone Set
To install,
D-180493 (dial tone detector
calling switch kit)
and one-touch
Page 13
SECTION 503-603-101
D-180494
(2/4-wire
D-180818 (record
feature switch)
(c)
Bottom
relay
disable
of telephone
kit)
with 508-type plugs for terminating
of the 635-type key module at the
and dial
set (Fig.
intermix
7).
• Battery.
B.
3.15
Mounting Cord
The D50BB-87 mounting
ended at the equipment
cord is amphenol
end and equipped
Fig. 6--$2872A1M
(MD) or 2872A2M
Feature Only_l
Page 14
on the bac_
telephone
set
end.
The conductors
terminated
in the 508-type!
plugs provide the major line service requirements.i
Spade-tipped
conductors
are provided for auxiliary'
control
functions
or options and are terminated
directly on associated equipment,
terminal
boards,
or stored.
Note:
Sets manufactured
prior to fourth
quarter
1976 were equipped
with D50AM-87
mounting
cords. The major difference
in the
cords is that TIP and RING contact
strips
Telephone Set, Connection of D-180818
Kit of Parts, Record Disable
ISS 5, SECTION 503-603-101
Fig. 7--2872AIM
(MD) or 2872A2M Telephone Set, Bottom View
were required
with the D50AM-87, whereas
individual conductors of the D50BB-87 connect
to the TIP and RING contacts of the 635-type
key.
C.
(3) Remove
(4) To replace the cover, the three tabs of the
cover (one at the top center and one at each
side just above the dial) must be aligned with
holes in the chassis before the screw is refastened.
Failure to do this will result in improper seating
of the faceplate.
Network Terminals
3.16
(1)
For
access
Remove
to the
network
the faceplate
terminals,
(paragraph
3.19).
(2) Loosen the captivecover
screw at the bottom
of the white cover around the dial (Fig. 2).
the cover.
D.
3.17
Power Supply (PSB), Terminals
To access the terminal
field on the
supply board, proceed as follows.
power
Page 15
SECTION
503-603-101
TOUCH-A-MAT I C
TELEPHONE
SET
_/
II 7 VAC
(NOTES1
AND 4)
1
95B-TYPEI
POWER |
D-STATION WIRE
_
L
UNIT
(NOTE ._)
J
'
' 1
;
,-
MOUNTING CORD
(
149B ADAPTER
(NOTE 2)
J
"
(NOTES
\
--I _-TY_po_
t--I_'"_
I
(NOTE 2)
___
UNIT
I
6)
t
,.,
.j
(31)
21
(I0) t
30
=_.
<
_"
(36)
(15) t
_
31
_,_
I 0
TO KEY TELEPHONE
SYSTEM
(NOTE 2 )
1
(20)
50
ADAPTER
OR 66E3-25
BLOCK,
AT KEY
TO AC POWER
AT SET CONN.
LOCATION,
AT OR
149B
_
EQUIPMENT END. SEE PARA. 3.03.
2. I F THE POWER UNIT IS TO BE CONNECTED AT
I'_0
i
_,'46
J
_I
--t'--I
THE 149B ADAPTER OR THE 66E3-25 BLOCK,
INSULATE AND STORE THE (BL-V) PAIR AT THE
I
I
i
I
I
t
iI
(25)
;1'21_
,_
LI
KEY EQUIPMENT END.
3. INSULATEAND STORE THE (BL-V) AND (V-BL)
MOUNTING CORD LEADS FROM PSB TERMINALS.
4. A 95B-TYPE POWER UNIT IS REQUIRED FOR EACH
TELEPHONE SET.
NUMBERSIN PARENTHESES
INDICATE
CONNECTOR PiN NUMBERS
I
40
NOTES:
I. THE 95B-TYPE POWER UNIT MAY BE CONNECTED
f
t
1D-STATION
,,7 VAC__
IAND4)
_"_
t
CONN
BLOCK
66E3-25
(NOTE 2)
D-STATION
95B-TYPEI
WIRE
POWER
UNIT
_ C.O.
--
-KEY TELEPHONE
,- ----
---
D'STATION
J_>W,RE
4_
SYSTEM
I POWER
L
L If7 VAC
IUNIT
I
I
95B-TYPE
(NOTES
I AND 4)
66B4-25 CONN BLOCK
OR EQUIVALENT
Fig.
Page
16
8--2872AIM
(MD)
or
2872A2M
Telephone
Set,
Alternate
Power
Connection
Methods
L
L 117 VAC
• (NOTES
| I AND 4)
ISS 5, SECTION
TABLE
CONNECTIONS
-
2872AIM
OR 2872A2M
503-603-101
B
TELEPHONE
SET WITH 3B (MD) SPEAKERPHONE
....
,
ONLY
,
i ,
CONNECT
,,
LEAD
TEL. SET
(NOTE 1)
APPARATUS
DESIG
,
, ,
,
,
TO PSB
TE
RM.
,
,,
19
1
8A
R1
G-V
*
11
28
10
7A
12
2
A1
5
11
12A
35
IIA
AG
V-S
*
L2_f
LK
S-V
*
17
R or R1
Strap
|
]
Cord)
760A LSPK
Cord)
34
1B
9
25
1A
17
33
2B
8
24
2A
PSB10
Strap
BK
PSB20
CE
BL-BK
10
BK-BL
15
R-BL
16
LK
BL-R
17
SHi
G-W
18
PrR
BL-V
20
VDD
W-G
21
M1
"S'BK
4
7
P1
BL-R
13
8
--15V
S
BK-S
O-BK
14
3
16
18
Y-O
29
19
G-Y
2
17
11
35
SHa
1
A1
i
LK
BK-O
SP1
G
34
20
SP2
R
335
295
........
3B §
Pwr-Unit
AC2
4B §
Trnsf
AC1
AC2
!.......
Insulated
and stored.
Terminal on network.
To reduce loudspeaker
volume, move
Insulate and store (BL-V) and (V-BL)
,
,,
Poge
17
*
A C1
2012D
,
*
95B-Type
2012B (MD)or
•
t"
5
§
i
18
BK
F1
(R2FK
11
,,,
I
B+
(T7A
TERM.
2
B or B1
666B
TRMTR.
, ,
*
B or B1
Kit
of
Parts
55B
= ,,,,
V-G
R or R1
D-180492
,
T1
A1
Tel Set
55A
,
TO
149B ADPT
(D10R
CORD)
CONT UNIT
(NOTE 2)
COLOR
FROM
,
FROM
SP2 lead to terminal 24 (55A)
leads in connector
cable.
Note 1 • Plug telephone set mounting cord into 149B adapter.
Note 2: When 55A control unit is used, it must be the type modified
20 and 21 (55A) or 4 and 5 (55B).
27
27
36
36
_,
or 30 (55B)
for TOUCH-TONE,
and strap
terminals
SECTION503-603-101
(1) Remove the faceplate
(paragraph
3.19).
F.
(2) Loosen the captive cover screw at the bottom
of the white cover around the dial (Fig. 2).
(3) Remove the cover.
(4) Loosen the two captive screws that
the dial in place,
hold
Faceplate Removal
3.19
(a) The 2872B1 faceplate is held in place by a
spring clip attached to the 870A1U upper
housing.
To disengage the faceplate, lift up
the tab which protrudes from the center of the
back edge of the faceplate.
Note:
On sets with metal dial brackets, the
screws will have to be removed.
Note:
The 2872B1 faceplate is not a direct
replacement for the 2872A1-87 faceplate. An
870A1U upper housing is also required with
the 2872B1 faceplate (see paragraph 6.11).
(5) Gently raise the dial and disconnect 12 position
plug from terminal board,
(6) Rotate dial over onto the memory.
(7) To reassemble; reverse procedure,
(8) To replace the cover, the three tabs of the
cover (one at the top center and one at each
side just above the dial) must be aligned with
holes in the chassis before the screw is refastened.
Failure to do this will result in improper seating
of the faceplate,
Removal will differ depending on faceplate
provided.
(b) The 2872A1-87 faceplate is held in place by
two snaps bonded to the faceplate and aligned
to fit holes in the chassis.
To remove the
faceplate, grasp it by any convenient edges and
lift.
G. Handset Cradle Removal
3.20
To remove the handset cradle
housing, proceed as follows.
(1) Remove the faceplate (paragraph
place the handset aside.
from
the
3.19), and
E. LineKey Removal
3.18
To remove, use the following procedure.
(1) Remove faceplate (paragraph
3.19).
(2) Push the key toward the rear of the set to
unlock it from the tabs.
(3) Raise the metal plate of the key just above
the tabs and move the key toward the left,
then raise the right end of the key until it clears
the chassis of the set.
Warning:
Do not damage
contact
strips
which
protrude
from
bottom
right side of key or logic reset switch
attached
on HOLD
side
of key.
(Contact strips
will only be found on
sets equipped with DSOAM-87 mounting
cords.)
(2) Remove upper housing, if provided, [paragraph
3.21(b)].
(3) Disengage the captive cradle screws (if
provided) located in the two tabs on the
cradle (Fig. 2).
(4) Lift the cradle, by pulling up on the plunger,
and remove.
(5) Replace the handset cradle by sliding it
sideways to engage the clips with the mating
tabs in the side of the housing.
Warning:
The plunker
must be held
from the top side of the cradle as it
is slid into position
to prevent
damage
to the line switch arm.
(6) Refasten the captive cradle screws, if provided.
(4) Lift the key completely out of the set.
H. HousingRemoval
(5) Replace key by reverse procedure.
3.21
Page 18
To remove, proceed as follows.
ISS 5, SECTION 503-603-101
(a)
Lower
4.
housing.
(1)
Unplug the handset cord, at the telephone
set end and remove handset.
(2)
Remove
the faceplate
(paragraph
(3)
Remove
3.20).
the
cradle
handset
Warning:
Attempting
to
housing
without
removing
cradle
may
damage
the
CONNECTIONS
4.01
Telephone set connections
9 and Table I.
3.19).
Caution:
are not
Some
standard
are shown
conductor
(Table
in Fig.
assignments
D.
(paragraph
remove
the
the handset
line
switch
4.02
Refer to Table
for all options.
4.03
A partial
Fig. 15.
A for connection
functional
schematic
reference
is shown
on
arm.
(4) Disengage the four captive housing screws
(Fig. 2) located in each corner of the upper
housing.
5.
OPERATION
A.
Record A Number Into Memory
5.01
(5) Separate
the housing
set base.
from
(1) Remove
(6) Feed mounting cord through hole in bottom
of housing as housing is removed,
(7) Before replacing the housing, lift the set
to check that the shoulders of the battery
jack are against the two tabs on the chassis.
Misalignment
may cause the bottom of the
housing to bow.
(8) When replacing
the housing,
keep the
handset jack from being trapped between
the housing and the chassis.
(b)
Upper
(1)
the
the faceplate
(paragraph
3.19).
(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 adjacent
to the RECORD button will
light.
(A number
can be called and recorded
simultaneously
by lifting handset before depressing
the RECORD button.)
Note:
If set is equipped with the D-180818
Kit of Parts,
switch must be in the OFF
position.
housing.
Remove
To record.
the telephone
faceplate
(paragraph
3.19).
(2)
Disengage
the captive
housing
screws
located in each corner of the upper housing
(Fig. 2). This will release the lower housing.
(5) Depress the specific memory button adjacent
to the desired
telephone
number
listed on
the directory
sheet.
(6)
(3)
Pull the upper housing
away from the
chassis as each housing screw is backed
out.
This will separate
the upper housing
from the chassis.
(4) If necessary,
housing,
(5) To reassemble,
back
screws
reverse
out
procedure.
of upper
Manually dial the desired telephone number,
if an access code and pause for second dial
tone is required-(a)
Dial
line.
the
access
digit(s)
for the
outside
(b) Push the WAIT button when the RECORD
lamp relights.
(The WAIT entry counts
as one digit.)
(c)
Dial the
telephone
number.
Page 19
SECTION 503-603-101
Note:
A number
up to 15 digits
may be recorded.
The RECORD
go out momentarily
as each digit
If exactly 15 digits are recorded, the
in length
lamp will
is dialed,
RECORD
(b)
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.
(c)
(7)
For sets equipped with the dial tone detector
only, go off-hook, listen for dial tone, and
depress the desired memory button.
For sets equipped with the one-touch calling
option
(with speakerphone
and dial tone
detector),
simply depress the memory button.
E.
LAST NUMBER DIALED Feature
Depress the RECORD
OFF button
if less
than 15 digits are recorded.
The RECORD
lamp will go out. The dialer will be reset. The
number
is now stored in the selected memory,
5.05
The dialer will also be reset by a line
line key, or speakerphone
operation,
switch,
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.
is equipped with a D-180818
switch must be in the OFF
Note:
If set is equipped
with a D-180818
Kit of Parts,
and dial intermix
feature
is
provided,
LAST NUMBER
DIALED
feature
is functional
only when the feature
switch is
in the OFF position.
B.
Change A Number In Memory
Note:
If set
Kit of Parts,
position,
Whenever
a new number
is recorded
in a
previously
used memory
position,
it will
automatically
replace the previously stored number.
The
TOUCH-A-MATIC
telephone
set
automatically
records into the LAST NUMBER
DIALED position (Fig. 1) any number dialed using
the standard
telephone
dial.
Each number in the
5.02
C.
Delete A Number From Memory
Note:
Kit of
5.06
(a)
If set is equipped
with a D-180818
Parts, switch
must be in the OFF
the RECORD
(2) Depress the
to the name
(3)
Depress
no access
(2) Listen
Complete the following operations
(1) Depress
With
in succession.
button.
memory
button corresponding
and number to be deleted,
the RECORD
OFF
of
LAST
digit(s)
NUMBER
DIALED
required.
(1) Go off-hook.
position.
5.03
Operation
feature.
for dial tone.
(3)
Manually
dial
(4)
To redial
same
telephone
number
number.
automatically--
(a)
For factory-wired
sets, go off-hook,
listen for dial tone and depress LAST
NUMBER DIALED button.
button.
(b)
D.
For sets equipped with the dial tone
detector
only, go off-hook,
listen for
dial tone, and depress the LAST NUMBER
DIALED button.
Automatically Dial A Number From Memory
5.04
To automatically
dial
a number.
(c)
For sets equipped with the one-touch
calling option (with speakerphone
and
dial tone detector),
simply
depress
the
LAST NUMBER DIALED button.
(a)
For factory-wired
sets go off-hook,
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
complete automatic
dialing,
Page 20
button
again
to
(b)
When an access code and pause
dial tone is required.
for second
ISS 5, SECTION 503-603-101
(1) Go off-hook,
(2) Listen
for dial
(3) Dial access
before another
number
can be dialed from
memory.
(The RECORD lamp will not light
at any time but depressing
the RECORD
OFF button will remove the set from the "last
number
dialed"
mode and allow additional
automatic
dialing.)
tone.
digit(s),
(4) Depress WAIT
tone is heard.
button,
after
second
dial
(b)
(5) Manually
dial
telephone
(6) To redial
same
number
Dial
Intermix
(D-180818
Kit
of
Parts):
With the switch in the ON
position,
manually
and automatically
dialed
digits may be intermixed
as desired. Operation
of the RECORD OFF button is not required.
number,
automatically,
(a)
For factory-wired
sets, go off-hook,
listen for dial tone and depress LAST
NUMBER
DIALED
button.
Automatic
dialing
will stop at the recorded
WAIT
input.
When second dial tone is heard,
depress LAST NUMBER
DIALED
button
again to complete automatic
dialing.
MAINTENANCE
(b)
(c)
A.
For sets equipped with the one-touch
calling option (with speakerphone
and
dial tone detector),
simply
depress
the
LAST NUMBER DIALED button,
End-to-End Signaling
5.07
For end-to-end
signaling
(such
as data
transmission)
this set has the capability
to
intermix manual and automatic
dialing.
This can
be accomplished
if the following
procedures
are
observed.
Note:
If the telephone
set is to be used
for end-to-end signaling, V option (with polarity
guard) shall be used, (Fig. 9B).
(1) If the telephone
set is equipped with the
one-touch calling option the initial number
must be dialed automatically
(even if the one-touch
calling switch is in the OFF position).
This
allows the dial tone detector
to complete
its
function
and then additional
numbers
may be
dialed automatically
or manually,
(a)
6.
In case of power failure, the automatic dialing
feature cannot be used. 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.
For sets equipped
with the dial tone
detector
only, go off-hook,
listen for
dial tone, and depress
LAST NUMBER
DIALED button.
F.
Note:
In this mode, the RECORD button
and the LAST NUMBER DIALED feature are
inoperative.
Standard
Operation:
If, at any time,
information
is keyed in manually,
the
RECORD
OFF button
must be depressed
6.01
Trouble Analysis
6.02
When trouble is encountered,
the subsequent
procedure
should be followed.
(1)
Confirm improper operation either as a basic
telephone
set or as an automatic
dialer
(Part 5).
(2) Check
for improper
connections.
(3) Refer to Table N, and the following paragraphs.
(4) If removal
follows.
of
set
is
required,
(a)
$Disconnect
and unplug
power unit
battery.0
(b)
Disconnect
telephone
from
proceed
as
ac outlet
set.
(c)
Place battery
plug sideways into housing
slot below battery
jack and tape into
place.
Warning:
Failure
to restrain
plug
can result
in plug damage
necessitating
battery
replacement.
Page 21
SECTION 503-603-101
B.
Battery
(6)
Replace the memory
by engaging
the dial
connector
first.
The dial connectors
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.
It
should form a loop as shown in Fig. 5 when
connected
to the board.
6.03
The KS-20390L2 and L4 batteries
are not
completely
interchangeable.
The List 2
battery
may be used in both sets but the List 4
battery
should
only be used in the 2872A2M
telephone set. Either battery has an expected life
of about 4 years.
It can be replaced without loss
of memory provided that commercial
ac power to
the set is continuously
maintained.
To replace
the battery,
proceed as follows (Fig. 7).
(1) Tilt the front
(2) Unplug
(4) Remove
battery
(5) Remove
battery.
Install
set up.
set.
(8) SReconnect
battery
(9)
the battery.
(3) Loosen captive
(6)
of the
(7) Reassemble
(10)
screw on the battery
support.
support.
D.
6.05
may be replaced
(1) IbDisconnect power
unplug battery,
see Part
5.0
from
ac outlet
To replace.
Note:
results
unit
and
Removal
of ac and battery
power
in the loss of stored numbersAI
(2)
Proceed
per paragraph
3.17.
(3)
Loosen the four captive
the memory (Fig. 4).
mounting
screws
of
unit
from
Gently raise the left side of the memory
and rotate to position shown in Fig. 5. This
will expose 10-position dial connector.
in the following
ac outlet
(5) Carefully
disengage
the dial connector
by
pulling on it perpendicular
to the printed
wiring board.
and
Removal of the memory
or ac and
power results in loss of stored telephone
(6) Lift
numbers.0
(2) Remove
the dial out.
(7)
the faceplate
the four
(Fig. 4).
(paragraph
captive
memory
(4) Rotate the left edge of the memory
as shown in Fig. 5.
To install a new dial, reverse the previous
steps.
The connectors
are keyed to orient
them relative
to the pins.
Observe the correct
orientation
and do not force the connection.
3.19).
mounting
upward
(5) Disengage the two connectors
by pulling on
them perpendicular
to the printed
wiring
board.
Page 22
memory,
(4)
The memory
manner.
(3) Loosen
screws
3.07.
new battery.
Memory
Note:
battery
Reprogram
(1) 0Disconnect
power
unplug battery.
When battery
has been connected
at least
five minutes,
check memory
retention
by
momentarily
disconnecting
ac power and then
automatically
dialing a known telephone number.
6.04
paragraph
unit.
Dial
(7)
C.
Test per
and power
(8) SReconnect
battery
(9)
memory,
E.
6.06
Reprogram
6-Button Line Key
To replace.
and power
see Part
unit.
5.1
ISS 5, SECTION503-603-101
(1) 0Disconnect power unit from ac outlet and
unplug battery,
Note:
Removal of ac and battery
results in loss of stored numbers.e
power
(9) Install new ringer and assemble in reverse
order. The leads should be routed as shown
in Fig. 3 to prevent contact with the gong and
subsequent dampening of the ringer output.
(10) Reassemble set.
(2) Remove key per paragraph
3.18.
(11) 0Reconnect battery
(3) Access PSB terminal
3.17.
and power unit.
area per paragraph
(12) Dial ringback code to test ringer.
(4) Disconnect logic reset
terminals 14 and 29.
leads
from
PSB
(5) Remove the 508-type plugs and (if provided)
the two contact strips from the back of the
key.
(6) Install new key.
(13) Reprogram
memory, see Part 5.0
G. Buzzer
6.08
To replace the buzzer.
(1) BDisconnect power unit from ac outlet and
unplug battery.
(7) Reassemble the set.
Note:
Removal of ac and battery
results in loss of stored numbers.0
(8) DReconnect battery and power unit.
power
(9) Test for operation of the logic reset switch
[paragraph 3.07(7)].
(2) Remove the faceplate (paragraph
place handset aside.
(10) Reprogram memory, see Part 5.0
(3) Remove upper housing, if provided, [paragraph
3.21(b)].
F.
3.19), and
Ringer
(4) Remove the cradle (paragraph
6.07
3.20).
To replace.
(5) Remove the buzzer mounting screw.
(1) BDisconnect power unit from ac outlet and
unplug battery.
Note:
Removal of ac and battery
results in loss of stored numbers.0
(2) Remove the faceplate
place handset aside.
(paragraph
power
(7) Move terminal board TB1 to gain access to
the appropriate terminals on TB2.
3.19) and
(8) Remove appropriate
(3) Remove upper housing, if provided,[paragraph
3.21(b)].
(4) Remove the cradle (paragraph
(6) Remove the mounting screw and spacer for
TB1 (Fig. 3).
leads (Fig. 9H).
(9) Reassemble.
When replacing TB1, locate
its tabs in the slots of the chassis before
refastening the TB1 mounting screw.
3.20).
(10) jReconnect
battery and power unit.
(11) Reprogram
memory, see Part 5.0
(5) Disconnect the ringer leads (Fig. 9I).
(6) Tilt the front of the set up.
(7) Loosen ringer mounting screws (Fig. 7).
H. Handset Jack
(8) Remove ringer.
6.09
To replace the 616B handset jack.
Page 23
SECTION 503-603-101
(1) SDisconnect
power
unplug battery,
Note:
results
unit
from
ac outlet
Removal
of ac and battery
in loss of stored numbers.e
and
power
(2) Remove the faceplate
place handset
aside.
(paragraph
(3) Remove upper housing,
3.21(b)].
if provided,[paragraph
(4) Remove
the
cradle
(paragraph
(5) Remove the mounting
TB1 (Fig. 3).
(6) Move terminal
the appropriate
(4) Remove upper housing,
3.21(b)].
3.19), and
(5)
and spacer
(Fig.
(10)
Reconnect
(11)
Reprogram
I.
through
battery
wire
guide
and power
memory,
see Part
(7)
Insert
through
(8)
Attach stayband
(Fig. 3).
(9)
Route
9H),
Note:
results
Page 24
handset
leads
to bottom
as shown
Reassemble
set.
(12)
SReconnect
battery
(13)
Reprogram
memory,
J.
5.e
6.11
ac outlet
Removal
of ac and battery
in loss of stored numbers.g
H4DU
hook
(11)
of chassis
connections
in Fig. 3.
(Fig. 9H).
and power
see Part
unit.
5.¢
Faceplate
and
power
cord at telephone
To replace
a 2872A1-87
2872B1 faceplate.
faceplate
(1)
Remove the 2872A1-87
up at any of its edges.
(2)
Remove
the four captive
(Fig. 2) from the chassis.
faceplate
with
a
by lifting
housing
screws
(3)
Use the four housing screws to mount the
870A1U upper housing to the chassis and
870A1 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 2872B1 faceplate
in the notches
in the lower side of the 870AiU-type
upper
housing.
(5)
(2) Unplug
end.
3.20).
spade-tipped
end of handset
cord
hole in the side of the housing.
Make
unit.
A defective G15A handset
may be replaced
or changed to a modular amplifying handset
(G6BM, G7BM, or G8BM) by unplugging the H4DU
cord and inserting
it into the new handset.
To
replace
the G15A handset
with
a nonmodular
amplifying
handset
(G6B, G7B, or G8B) proceed
as follows,
from
(paragraph
as shown
6.10
unit
cradle
(10)
Handset
(1) BDisconnect
power
unplug battery,
if provided,[paragraph
to
(8) Reassemble.
When replacing
TB2, locate
its tabs in the slots of the chassis before
refastening
the TB1 mounting screw.
(9) SRoute leads
in Fig. 3.
handset
and
for
board TB1 to gain access
terminals
on TB2.
leads
Remove
3.19),
(6) Disconnect
616B handset
jack (paragraph
6.09). (Jack may be removed or stored just
to right of ringer.)
3.20).
screw
(7) Disconnect
the appropriate
and remove jack.
(3) Remove
faceplate
(paragraph
place handset
aside."
set
the
Lower the faceplate
to rest on the memory.
The spring clip located at the top center of
upper housing should retain the faceplate.
ISS 5, SECTION 503-603-101
K.
Speakerphone
6.13
For speakerphone
connections
Tables, B through E.
use appropriate
6.12
For maintenance
information
on the 3B
$(MD)I, or 4A speakerphone
systems, refer
to Section 512-620-100 or 512-700-100, respectively.
Page 25
SECTION
503-603-101
l TABLE
CONNECTIONS
-
ONE-TOUCH
2872AIM
CALLING
Ce
OR 2872A2NI TELEPHONE
SET WITH
USING 39 (MD) SPEAKERPHONE
CONNECT
TE L SET
(NOTE 1)
LEAD
APPARATUS
COLOR
FROM
TO PSB
TERM.
55A
TERM.
V-G
*
2
19
1
8A
R1
G-V
*
11
28
10
7A
12
2
A1
5
11
12A
llA
AG
V-S
*
L2_"
LK
S-V
*
17
11
35
SPO
O-V
*
34
3
18
5B
R or R1
18
34
1B
R or R1
9
25
1A
B or B1
17
33
2B
B or B1
8
24
2A
Strap
BK
10
*
Strap
BK
20
*
BK
19
*
Strap
BK
26
*
Strap
BK
29
*
Input
G-R
2
PB
O-BK
9
Input
G-R
Strap
i
Page 26
55B
T1
A1
D-180493
Kit
of
Parts
TO
149B ADPT
(D10R
CORD)
CONT UNIT
.....................(NOTE 2)
-
DESIG
Tel Set
FROM
11
•-
LK
Y-G
17
DT
O-Y
19
VDD
R-O
21
DR
Y-O
24
ISS 5, SECTION
TABLE
CONNECTIONS
- 2872AIM
ONE-TOUCH CALLING
=,,
, , ,
,
503-603-101
C (Contd)
OR 2872A2M TELEPHONE SET WITH
USING 3B (MD) SPEAKERPHONE
.........
,
CONNECT
LEAD
TEL SET
(NOTE 1 )
FROM
TO
CONT UNIT
(NOTE 2)
149B ADPT
(D10R
CORD)
APPARATUS
DESIG
COLOR
FROM
TO PSB
TERM.
DTT
BL-Y
26
SPR
Y-BL
27
Kit
of
COM
BK-O
29
Parts
(Contd)
SPO
G-Y
34
55A
55B
TERM.
D-180493
S
......
28
S
29
CE
BL-BK
10
B+
BK-BL
15
SHa
....
LK
R-BL
16
BL-R
17
SHi
G-W
18
PFR
BL-V
20
VDD
W-G
21
M1
S-BK
4
7
P1
BL-R
13
8
--15V
BK-S
11
16
666B (MD)
TRMTR
S
O-BK
3
18
(T7A Cord)
A1
Y-O
29
19
F1
G-Y
2
17
LK
BK-O
11
35
SP1
........
SP2
G
34
20
R
335
295
Switch
D-180492
Kit
of
Parts
760A (MD)
Lspk
(R2FKCord)
Page 27
SECTION
503-603-101
$ TABLE
C (Contd)(I
CONNECTIONS
- 2872A1M OR 2872A2M TELEPHONE
SET WITH
ONE-TOUCH CALLING USING 3B (MD) SPEAKERPHONE
..............................
-
_
CONNECT
LEAD
TEL SET
(NOTE 1)
APPARATUS
FROM
.....
TO
149B ADPT
CONT UNIT
t
_NOTE
2_
_OlO_
CORD)
......
DESJG
II
I
II
i
m
COLOR
FROM
_
95B-Type
Pwr Unit
AC1
[
Ill
I
TERM.
II
II
55A
I
I
55B
I
I
I
TERM.
I
1
_
I
I
_
AC2
I
(MD)
AC1
Trnsf
AC2
or
I
3B §
4B §
.....
_'
'
2012D
II
.....
i
I
2012B
II
!
27
27
36
36
........
!
..................
Note
1
Note
2. When 55A control unit is used, it must be the type modified
strap terminals 20 and 21 (55A) or 4 and 5 (55B).
Plug telephone
* Insulated
and stored.
t
on network.
Terminal
To reduce
§ Insulate
Page 28
set mounting
loudspeaker
and store
volume,
(BL-V)
cord into 149B adapter.
move SP2 lead to terminal
and (V-BL)
leads in connector
24 (55A)
cable.
for TOUCH-TONE,
or 30 (55B).
and
ISS 5, SECTION
$ TABLE
CONNECTIONS
- 2872AIM
4ASPEAKERPHONEONLY,
COLOR
TEL
SET
FROM
82B
CONN
BLK
(NOTE 1 )
TO
PSB
TERM.
T1
V-G
*
2
R1
G-V
*
11
A1
Tel
Set
,,,
D-180492
Kit
of
Parts
AG
V-S
*
L2J"
LK
S-V
*
17
Strap
BK
PSB-10
*
Strap
BK
PSB-20
CE
BL-BK
10
B+
BK:BL
15
SHa
R-BL
16
LK
BL-R
17
SHi
G-W
18
PFR
BL-V
20
SET WITH
BLOCK
CONN
CABLE
AT KEY
EQUIP
COLOR
TO
[
(Note
vDD w-Q
85B1
Power
Unit
TELEPHONE
USING 82B CONNECTING
APPARATUS .........
DESIG
Dg
OR 2872A2M
LEAD
2)
*
21
AC1
BK
AC1
AC2
Y
AC2
AC1
R
21
BR-V
*
V-BR
*
BL-V
95B-Type
Powe r
Unit
Note
Note
•
t
G
46
*
!
I
!
V-BL
AC2
503-603-101
i *
i
1 • Plug mounting eords of telephone
set, 108-type loudspeaker,
and
680-type transmitter
into 82B eonneeting
block.
Install option
plug in ringer cutoff mode.
2" For 1A1 or 1A2 KTS, eonneet link between
2 and A1. For 1A KTS,
connect link between 19 and A1.
Insulated
Terminal
and stored.
on network.
Page
29
SECTION
503-603-101
TABLE
E
CONNECTIONS
- 2872A1M OR 2872A2M TELEPHONE
SET WITH
ONE-TOUCH CALLING USING 4A SPEAKERPHONE
LEAD
TEL
SET
APPARATUS
DESIG
COLOR
FROM
TO PSB
TERM.
2
T1
V-G
*
R1
G-V
*
CONN
CABLE
AT KEY
EQUIP.
82B
CONN.
BLK
(NOTE 1)
COLOR
TO
11
A1
(Note 2)
AG
V-S
*
L2t
LK
S-V
*
17
SPO
O-V
*
34
Strap
BK
10
*
Strap
BK
20
*
Strap
BK
19
*
Strap
BK
26
*
Strap
BK
29
*
Input
G-R
2
PB
O-BK
9
Input
G-R
11
LK
Y-G
17
DT
O-Y
19
VDD
R-O
21
DR
Y-O
24
PL
O-R
25
,,
Tel
Set
D-180493
Kit
of
Parts
DTT
BL-Y
26
SPR
Y-BL
27
COM
BK-O
29
SPO
G-Y
34
SWITCH
Page
30
S
,, ,
S
28
29
Strap
10 to 35
O-V
*
ISS 5, SECTION
"
$TABLE
CONNECTIONS
- 2872AIM
ONE-TOUCH
E (Contd)4
OR 2872A2M
CALLING
.
LEAD
. .
COLOR
....
.
,
SET WITH
,
TEL
SET
....
DESIG
,
TELEPHONE
USING 4A SPEAKERPHONE
.....
APPARATUS
503-603-101
FROM
,
,
CONN
CABLE
AT KEY
EQUIP.
82B
CONN.
BLK
(NOTE 1 )
_
TO PSB
TERM.
,
COLOR
. .
CE
BL-BK
10
B+
BK-BL
15
SHa
R-BL
16
LK
BL-R
17
SHi
G-W
18
PFR
BL-V
2O
VDD
W-G
21
,
,,
TO
.
.....
D-180492
Kit
of
Parts
BR-V
*
V-BR
*
BL-V
*
V-BL
*
Plug mounting cords of telephoae
set, 108-Type
loudspeaker,
and 680-Type
into 82B connecting
block.
Install option plug in ringer cutoff mode.
transmitter
85B1
Power
Unit
AC1
BK
AC2
95B-Type
Power
Unit
Y
AC1
Note
1
Note 2.
21
G
ii ,
,
• Insulated
and stored.
t
on network.
46
......
For 1A1 or 1A2 KTS, connect
19 and A1.
Terminal
AC2
R
AC2
= ,
AC1
link between
2 and A1.
For 1A KTS, connect
link between
Page
31
SECTION
503-603-101
I_ TABLE
CONNECTIONS
TELEPHONE
- 2872AIM OR 2872A2M
SET WITH DIAL TONE
DETECTOR
__
_
F0
ONLY
,
(SEE NOTE)
.....
LEAD
TEL SET
.....
APPARATUS
.SB
oEsiGco,o. F.OM TO
TERM
J
,....
Tel Set
, ,,,
of
*
26
*
G-R
PB
O-BK
Input
G-R
LK
Y-G
*
DT
O-Y
19
VDD
R-O
....
Y-O
24
..................
Parts
19
Input
..............
D-180493
Kit
L
Strap
BK
...............................
Strap
BK
..........
DR
.......
11
21
PL ....O-R ......
.....
DTT
'
2
9
BL-Y
2_
26
/
iii
SPR
Y-BL
*
COM
,,
BK-O
29
SPO
G-Y
..........
Switch
............
S
*
,,
S
,,
*
*
Note: May be used for applications
where first
dial tone is not precise (350 Hz and 440 Hz) but
all subsequent
dial tones must be precise if
number is to be dialed automatically.
• Insulated
and stored.
t- Switch is not required
not provided.
Page 32
when
speakerphone
is
ISS 5, SECTION
O-leOel8
KIT
OF PARTS
:
FIG. A
FIG B
MEMORY
-iI VGL
P5
POWER SUPPLY BOARD (NOTE 4)
PSB
VGL
I
(G-BK)
DTT
•)("
(G-R)
2
I _.._L__
lOT
I_
°1
I SH
--
i_
(BK-BL)
RESET
i0
>
VR
yDD-2,_
B+ ' ._
I
, _
:C
VDD-2
B+
>1
i"
POS
'
PB
NEG
(
c.
••
,8;
19 _ -
PL
' _
20 _ I
(o-w)_2,;I_,'
P2
CD
_
FIG. K
POS
17 , '
I / 2
-
I"3 "1
!(Y-DR)
r_
(W-G)
; (W-O)_
' _. 5
t _ 6
t_
, . 7
__/
•
G
(BK-BL)
*
(G-W)
FIG. I
(R-BL)
FIG. K
(BL-R)
16
(BK)
b R)
; _
(O-Y)
_1
; _
H3'
l (V-BL)
_
(BL-V)
(W-G)
_
\I
HI'
hiO)
]_
(R-O)
FIG.
FIG. C
(Y-G)
(_-w)
,
H2'
(Y-O) =_,
FIG
®
(R)
(BK)
IW(_)
cR
PB
_.G.
x
_r,,_
PL
: (Y-G)
(W-S)
Q
(BL-BK)
(G-R)
(G._(_)
,,
,,_ 1
/
(O-BK)
I0
_
>I
, _
(BK-O)
--
voo_,,..
.'i v°°-'- "
,, ;
RESET, _,
-/
.............. 7
PB
NEG
INPUT
(BR-R)
(R-G)
_(R)
:VR
(_
FIG. K
I Pc__
-
503-603-101
(O-R)
VDD
L2" G I_(BL) l]
_
L3
9 "'
_1
:(,-w)_
_
Cc
(W-BR) i
-
--I(R-G)__/_'
'qF"_- ST RAP (BK)
l (W--BL) ;_
_._-STRAP
(BR-W)
(BK)
/
_
I
! :(DR-W)-J--(
i\
_/" I
CD
26
!
1
I
l
I
l ....
i
_
25
24
BATTERY
J
.P'"o
/_1-B-(Y)
(BK)
(BK)
I%
;:
B+ (R)
_
/
3 x_l
2
3
a _
" /
-:
STRAP
(BK)
(BK)
(BK)
(NOTE 5)
B+ (R)
(O-R)
(Y-O)
(BL-Y)
( Y- BL)
DR
__
_
(S)
DTT
SPR
(_
(W)
(BK-O)
LRS-I
(S)
:
PL
(_
Q
COM
(_
SPO
FIG. E
(BL-V)
NOTES:
(V-BL)
I. FOR 3B SPEAKERPHoNE WITH
OR 4A WITH 82B CONNECTING
USE (O-V) LEAD. FOR 4A
149B ADAPTER
BLOCK,
MB7
RELAY
(G-Y)
(DR-W)
SPEAKERPHoNE
WITH 82A(MD) CONNECTING
BLOCK, LEAD WILL BE (V-BR).
2. FOR 28?2AIM SET - (BL)
(Y-G)
(W-BR)
(NOTE I)
FOR 28'72A2M SFl - (Y)
(G-Y)
5. I OR 28?2AIM SF_r - (Y)
FOR 28'72A2M SET - (BL)
35
(
OPTIONS
4. REMOVE
FACTORY STRAP
WIRED IF
WITH
l_), @, CALL
ANDING
@
5.
ONE-TOUCH
Fig. 9--2872AIM
OPTIONS
IS
PROV IDED
(MD)
-
)
FIG
I
FOR F I G. B-
(j_ WITHOUT DIAL TONE DETECTOR
@
(_) WITH POLAR ITY GUARD
(_ W ITH DIAL TONE DETECTOR
WITHOUT POLARITY GUARD
(_ WITHOUT SPEAKERPHoNE
@,
*
or 2872A2M
Telephone
WITH SPEAKERPHoNE
(_ AND _
WITH ONE-TOUcH CALLING
INSULATE AND STORE
Set, Connections
(Sheet
1 of 5)
Page
33
SECTION
503-603-101
FIG. D
DIAL
TONE DETECTOR
(P/O
D- 180.493)
INPUT
(G- R )
PB
(O-BK)
INPUT
(G-R)
DT
(O-Y)
VDD
(R-O)
DR
(Y-O)
PL
(O-R)
FIG. E
DTT
(BE-Y)
ONE-TOUCH
CALLING
SWITC H
(P/O D-180493)
SPR
(Y-BE)
COM
(BK-O)
SPO
(G-Y)
FIG. C
RELAY
PRINTED
WIRING
BOARD
(D- 80492
)
FIG.
PFR (BL-V)
VDD ( W-G )
lS_ (s)
FIG"
B
_S 2
_o7
__,_4
I
!
B
, ol
(S}
I
Fig. 9--2872AIM
Page
34
(MD)
or 2872A2M
Telephone
Set, Connections
(Sheet
2 of 5)
ISS 5, SECTION 503-603-101
FIG. F
LINE
FIG.G
SWITCH
DIAL
COMMON SWl TCH
a
,
(S)
,
a _
(Y)
,,,
b
(G-W)
c
(R-G)
(BR)
.......................
d
(G)
d
e........
(W)
e
'
f
(R)
f
(BK)
g JFiG.H
(BL)
h
(BL)
......
i
+g
h
(R)
10)
(BL)
FIIG-
'
(0)
+C
A
(W)
FIG.
B
C
E
(S-R)
j
!
,
(W-BL)
(V-BL)
(0)
'
(G-W)
(BR-W)
I
FIG.
c D
(O-W)
A
k !
DIAL
FREQUENCY SWITCHES
I(Y-G)
FIG.
FIG. B
I(BR)
_( H2
J(w-o)
- -
@
L,
HI
H3
(Y-BR)
(Y-O)
FIG.
Fig. 9--2872AIM
(MD) or 2872A2M
A
Telephone Set, Connections (Sheet 3 of 5)
Page 35
SECTION 503-603-101
FIG.H
FIG.I
TB2
TBI
(O-BK)
e
(W)
d....
(G)
-_
FIG. F
k
F,G.K t (Y-BL)
L
_
I
--xt_._(_/)
2"-""
_-
.....
I
( BL )
_
,
7
i
I
i
FIG.
B
h
(BL)
_
(BR-W)
KS-20419,
BUZZER
!
LI
....
---
(BK)
STRAP
(BK)
(W)
(BL)
(BL)
I
2
FIG.
L
__
(Y-BL)
:3
__)'-',
4.
(BK-BR)
5
GI5A
_
(BR-Y)
---
_
HANDSET
_
_P5 (BK)
'"
I FIG- J
(R)
8
)
(V)
(Y)
!
I
_
_i
(BR)
(BK) 1I FIG. I
(0)
.....
(BK-BL)
......
FIG.
F
•.
_t
-
(G)
(BK)
(Y-BR)
....
Ji5/
_
FIG.
FIG. J
(R)
(W)f
FIG, K i(BL,
Y)
(V-BL)
L
I
(W) t
TIPIG)
,B.)
j
I
(R!
' I
_<
.<
(G)
LJ
<1
!J
('11
(BR-Y)
I(BR..R)
........
(BK)
i _
1 !
o
_
9.
_
i_I_F(B.K_
BL ,
(ZEal--
(G)
J
L______
a
(S)
b
(Y) _
PIB RINGER
FIG.
l
f
( BK )
_z
___>)_'1
(o-w)
_
....
13
._, o.._-TYP_
._TWO.,
(BL-W)-
F
B
( S- Y )
FIG.
J
FIG.
(G-
--_2__E)
i FIG. J
15
G
j
(0)
kl
(O-Y)
_
®
FIG. I
16
FIG. K
K
(_ ....
(Y-S)_
T
., (v-o)
(2vF
(BL-W)
__
(_
PHYSICAL
A
OF 425K
(2)
RR
(_
"(R-G) I
(BK-G)
_-
....(BK-°)1
FIG.
B
B(__)
(G-BK)
H
Fig. 9--1_2872A1M
Page 36
R
_
i
STRAP
(,BK)
(MD) or 2872A2M
Q
_
LAYOUT
PHYSICAL
TERMINAL
OF 4?_?_8-TYPE
_
(_)F
(_
(_S
T
_
LAYOUT
NETWORK
F
(_
A(2)
(Z) K
Lira
K(,_
(2)
T
_
_
S
(_
RR
ON (_;_Z)
C
I(Y-BE)
(V-BL)
....
......
S (2)
'"
GN
FIG.
-_t'_
(_C
TERMINAL
NETWORK
G(__)
LI(2)
(2__
(_ RR
(_)G
B
IF NON-MODuLAR
AMPLIFYING HANDSET IS USED, YELLOW
CONNECTED
TO TERMINAL
I0.
WITH SPEAKERPHoNE
(R-BL)
LEAD WAS ON TERMINAL
F IN EARLY SETS.
Telephone Set, Connections (Sheet 4 of 5)(I
g
GN
LEAD
(_
r--'t
MUST BE
.....L2
R
ISS 5, SECTION
FIG. K
MTG
/
50
FIG. L
635
TYPE
KEY
CORD
AG
(V-S)
_LK
25 _
508
PLUGS
I-
LOGIC
(s-v)-*,
IT
(V-BR)
W
LRS-I
(W)
(BR-V)
(V-G)
_
..
LRS-2
(BR)
48_\ HL
R_
HLG
B2
(S-W)
5 _ B3
181/_ B4
B5
L
(G-Y)
PI N K
HLG
L
-_.)(.
....
(o-v)
I((Y-BL)
(G)
__
'
';
-
(V-O)
473 _
;_----LGI
(W-G)
_
..... ...........
|
_
\
I
// /
\ ;
"
I
1
I 1
I
> >
I
BLUE
(W-G)
(G-W)
,,,
\
>,_]
I
_. 2
_i
(BL)
_-
22 _-SPARE
_
( W-BR )
.I_L G
(BR-W)
.... _L
'
--_
,
(G-R)
,
(BL-BK)/.
(BR-BK)..
i
14 )-SPO
_
(G-V)_,
23
_
/
_ LG
_.
HOLD
_[__
'
,6 Bz, (_,-_)
_)
,
/
41_/
TI
RI
BZ "
(W-BL)
(BL-W)
(Y-BL)
....
._
I
..
'
1 F IG. H
(*-0}
I
(W-BL,,.4
29 /
-
T2
'
..................
'
,
(W-BR)
,BL-W,
L _i_ ,,.,6
(BL-R)
....
(R- BL)
,
,
--
FIG. B
(BR-W)
FIG.I
,
(R-G)
I
(BK)
..,
'
.
( R "BR)
.....
(S-W)
(R-O)
,
.
'
_
,
(BL-V)
'
'
.. "
.;
(V-BL)
(R-O)
_
(;
1
.. __ _
_6
_
•
C
i
I
]
\
>
_
/
(
_. 3
_
/ (
_/ _.
1_
1
"
J
r
(R-S)
4,5
<- R4
BII
IO (.
(S-R)
__
(BR)
(Y)
,
,
(R-S)
(Y-S)
2
,'_
FIG.I
;_ _s:R)
0
\
[
3
_
\
,,.,...I
02
03
_/ /
>
c. 6
_
l_
=
C_ _i :_
oIL
(BK-BL)
35 /T4
\
_
o6__
(O-BK)(O-BK)
4A,4H
,
\/
i
_. 2
BROWN
36 /
___
I
_____
05
(O-R)(O-R),
L4
,_
_. 1_
/ /
I
/''-/ _-;-
"LG_
_-/
±
12 /
__
GREEN
................
PWR
-
_/ /
./
/
7/ \
.......
_L
'
R3
L
._ 3
(BR-R)(BR-R)
AC PWR
/_
o2
(W-BR)
"
(R-BR)
....
>_-- I
_.LG
v
. O_ I
(W-S)
,.
33 x
7/
.
_
..............
LG3
• 3AI3H
32 / T3
\ AC
_
(R)
FIG. J
34
.
(Y-"O'i _..,5
(BR - W i *
9 / .L3
iii 3C
ORANGE
,
(o)
'_
._-Y_
.
17
sPARE
42 _' S PAR E
\ R2
4,,
--
03
F
FIG. B
L2
(BL-R)
3611_
(R-BL)
\ LG2'
30
?.A, 2H' .............
(W-S)
l
ST%
4924_. IR
.; TI
43
18 L)
503-603-101
_11_
L
I_
"_
4
__
SLATE
40
LG5
(BK-S)
S
39
15 /. L55A.5H. OR(S-BK)(
2 L-AI' B
:38
T5
SG
BE
19 x
4 (,
I 3
R5
(BK-S)
(BK-BR)
S- BK)
oLG
I
ooL-2
o
-_'_
(S)
o 3
04
_>
TIP
BK- G )
,
(v)
(o-w)
(B K-G 1(
(BR-Y)
(Y-BR)
I
RING
.... (G-BK)
I
_$-INSULATE
Fig. 9--1_2872A1M
AND
I
,
'(G)
(R)
I
"
"J"
v
(G-BK)
05
.___
6
!
\
/x/
__/. \/
/
]____
]
I.
_(_
STORE.
(MD)
or 2872A2M
Telephone
Set, Connections
(Sheet
5 of 5)e
Page
37
SECTION
503-603-101
i TABLE
CONNECTIONS
Ge
FOR 2/4-WI RE SERVICE
,
, •
APPARATUS
LEAD
COLOR
REMOVE
FROM
CONNECT
TO
BK-G
Net. GN
Net. L1
BK
Net. R
Tel Set
D-180494
Kit of Parts
• Insulated
*
PSB-17
V-BR
*
PSB-34
V
Net. T
S
Net. L2
BR
PSB-3
Y-BR
Net. L1
BL-R
Net. GN
G-BK
PSB-17
R-BR
Net. R
R'O
Net. S
BL-Y
PSB'34
and Stored.
i TABLE
CONVERSION
COLOR:
PI N NO:
Key
t
ORANGE
GREEN
BROWN
2
2
2
2
2
W
R
BK
Y
V
--.
Key
Functions
Note':
+
Insulate
SLATE
1
S
HPPPPP
TB1-3
TB1-2
TB1-2
TB1-2
TB1-2
TB1-4
HPPPPS
TB1-3
TB1-2
TB1-2
TB1-2
TB1-5
TB1-4
HPPPSS
TB1-3
TB1-2
TB1-2
TB1-5
TB1-5
TB1-4
HPPSSS
TB1-3
TB1-2
TB1-5
TB1-5
TB1-5
TB1-4
COMMON
508 PLUG
SIGNALING
BLUE
LEAD COLOR:
Functions
H _1
OF KEYS FOR SIGNALING
SELECTIVE
508 PLUG
*
BR-V
SIGNALING
(SEE NOTE)
COLOR:
BLUE
ORANGE
GREEN
BROWN
PIN NO:
2
2
2
2
2
SLATE
1
LEAr.) COLOR:
W
R
BK.....
Y
V
S
HPPP*P*S
TB1-3
TB1-3
TB1-2
TB1-2
TB1-2
TB1-3
HPP*P*P*S
TB1-3
TB1-2
TB1-2
TB1-2
TB1-2
TB1-3
and store (BK) strap
lead from
TB1-3.
* These arrangements
use line switch controlled
ground for common signal key, used with
private or intercommunicating
lines. Common signal should be used to operate a common
signal relay, Do not wire directly to a buzzer.
-i-Remove
Page
38
pins to make
key nonlocking
when
used for signaling.
ISS 5, SECTION
503-603-101
TABLE !
MOUNTING
CORD AND 508 PLUG CONNECTIONS
AMPHENOL
PLUG
INSIDE TELEPHONE SET
MTG CD TERMINATIONS
PIN
DESIG
COLOR
NO.
MTG. CD
R( 1 )
1
BL-W
T( 1 )
26
W-BL
A1
SPADE TIP
COND. IN
SPADE TIP CONDUCTORS FROM
508 PLUGS
508 PLUGS.
COLOR
PIN NO.
PLUG
COLOR
BL
6
BL
6
BL-W
BL
3
BL
3
W-BL
BL
2
W
BL
1
W-O
O
2
R
TB1-2
G
2
BK
TB1-2
G
1
S-W
TB1-7
2
O-W
A( 1 )
27
W-O
BL
1
L( 1 )
3
G-W
BL
L
28
W-G
LG( 1 )
TBl-12
BL
LG
R(2)
4
BR-W
O
6
T(2)
29
W-BR
O
3
1
B(2)
5
S-W
A(2)
30
W-S
O
6
BL-R
O
L
31
R-BL
O
LG
L(2)
LG(2)
*
R(3)
7
O-R
G
6
T(3)
32
R-O
G
3
B(3)
8
G-R
A(3)
33
R-G
L(3)
9
*
TB1-7
BR-R
G
L
PLUG PIN
NO.
COLOR
TERM.
,,
*
*
TB1-3
*
LG(3)
34
R-BR
G
LG
R(4)
10
S-R
BR
6
T(4)
35
R-S
BR
3
B(4)
11
BL-BK
*
BR
2
Y
TB1-2
A(4)
36
BK-BL
TB1-9
BR
1
BR
TB1-9
L(4)
12
O-BK
BR
L
LG(4)
37
BK-O
BR
LG
R(5)
13
G-BK
S
6
T(5)
38
BK-G
S
3
B(5)
14
BR-BK
S
2
V
TB1-2
A(5)
39
BK-BR
S
1
S
TB1-4
L(5)
15
S-BK
LG(5)
*
TB1-4
40
BK-S
BZl
16§
BL-Y
TB2-11
BZ
41_
Y-BL
TB2-5
S
L
S
LG
Page
39
SECTION
503-603-101
MOUNTING
TABLE I (Contd)
CORD AND 508 PLUG
AMPHENOL
PLUG
CONNECTIONS
INSIDE TELEPHONE SET
MTG CD TERMINATIONS
PIN
SPADE TIP
MTG. CD
COND.
IN
DESIG
NO.
COLOR
St)arc
17
O-Y
Spare
42
Y-O
*
HL
18
G-Y
PSB-32
HLG
43
Y-G
SG
19
BR-Y
TB1-5
BL
44
Y-BR
TB1-6
R or R1
20
S-Y
TBI-13
B or B1
45
Y-S
Net. K
AC1;
21_
BL-V
PSB-30
AC2;
46_
V-BL
PSB-31
SPO:!:
22._
O- V
*
SPADE TIP CONDUCTORS FROM
508 PLUGS
COLOR
J PIN NO.
I
*
508 PLUGS.
COLOR
PLUG
St)arc
47
V-O
23
G-V
*
TI:i:
48
V-G
*
IR:!:
24
BR-V
*
IT:i:
49
V-BR
*
LK:!:
25
S-V
*
A(;:!:
50
V-S
*
'
S
I
.........
• Insulate and store.
t 95B1 Power Unit (Touch-A-Matic
40
G
TB1-8
......
S
Ring
Page
TERM.
Net. T
Tip
for speakerphone
pin numbers.
COLOR
]
PS B-3:_
Rl:!:
:I: Designations
Nonstandard
NO.
PLUG
PIN
Power
options.
5
R
PSB-12
Pink
HL
BR-W
PSB-32
Pink
HLG
W-BR
PSB-33
Pink
3
BL
*
Pink
2
G
TBI-1
Pink
1
Y-BL
TB1-3
Supply)
Refer to Tables
B through
4
E.
_
ISS 5, SECTION
IbTABLE
J _1
$ TABLE
TO CONVERT
THE 2872AIM
,
,
,, ,
,
, , ,
DESIG
LSb
COLOR
,= , ,
CONNECTIONS
FOR D-180818
KIT OF PARTS
.....
TO
I
D-KIT
TERMINA L POSTS FOR
(1A1, 1A2)
(1A)
I
SWITCH LEADS
SWITCH LEAD CONNECTORS
TB1-12
TB1-5
Hold
Y-BL
TB1-3
TBI-16
Hold
BL
,(Pink
TB1-3
DESIG.
508 Plug)
Hold
,
I __
FROM
Y
...........
K (I
OR 2872A2M
TELEPHONE
SET FROM 1A1, 1A2, TO
1A OPERATION
(SEE NOTE)
LEAD
503-603-101
BK+
*
1
VDD
R
2
2
RCD
BK
3
3
R
PSB-12
LSct
BR
TBI-1
TB!-6
the
switch
leads.
A single
pin
connector with a (BK) lead and a double
R-BL
TBI-1
TB1-6
pin connector
Note:
1§
WDC
.....Ring
.......
Spare
INTERMIX
(NOTEFEATURE
2)
TBI-1
Net. L2 j:.
1§
RECORD DISABLE
AND DIAL
G
i
Spare
COLOR
(NOTE 1)
RECORD
DISABLE
ONLY
Tables B through E provide speakerphone
connections
for 1A1 and 1A2KTS.
The same
tables apply forlAKTS,
• Insulated
andstored,
+ Only required
Note
1:
2:
These
When
LAST
feature
memory
when busy-lamp
Only required when both
options are provided,
§ Connect to same spare
connector.
Note
option
busy-lamp
terminal
is provided,
and speakerphone
are
connectors
attached
to
with a (R) and (BK) lead.
this option
is provided
the
NUMBER
DIALED
(LND)
is disabled
and the 32nd
may
be
used
just
as
any
other memory.
* Insulate and store.
t Single pin connector.
or D-161488
Page
41
SECTION
503-603-101
$TABLE
CONNECTIONS
L 4
I) TABLE M11
FOR CONVERSION
TO SINGLE LINE SERVICE
BRIDGED RINGING
LEAD
DESIG.
CONVERSION
WITH
CONNECT
COLOR
TO BRIDGED
RINGING ON FIRST LINE WITH
6-BUTTON KEY SERVICE
LEAD
FROM
TO
DESIG.
CONNECT
COLOR
FROM
TO
Tip
W-BL
(1PU-3)*
TB1-8
Tip
W-BL
(1PU-3)*
Net. K
Ring
BL-W
(1PU-6)*
TBl-16
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*
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W-O
(1PU-1)*
TBI-1
Hold
Y-BL
TB1-3
*
LRS-2
BR
PSB-14
*
• Insulated
Page
42
and stored.
I
_ _-B-35
• Insulated
and stored.
ISS 5, SECTION 503-603-101
t
PSB-16
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J""o'-"
MTG. CORD
---<
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TBI-I?I?
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L2NETWORK
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WITHOUT STATION BUSY LAMP
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O
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WITH
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Page 43
SECTION
503-603-101
TELEPHONE SET
(TOUCH-A-_ T I C)
(6-BUTTON LINE KEY)
149B ADAPTER
R2FK
MOUNTI,N_- CORO
_B
I,_,,'I
/ ss-TYP_
I I_o,_B
(Mo)
l
_
J TYPE lJ
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J"lCONTROL I,,,..IOR
2012D
DIOR
IW, OR
CORD,
CAE4.E
INSIDE WIRE
I POWERI
TRNSF
_
l
lit VAC
[
MOUNTI NG CORD
A25B CABLE
117VAC
NOTE:
Fig.
Page
l l--0BIock
44
TO KEY TELEPHONESYSTEM(SEE NOTE)
DISCONNECT
THE
Diagram--2872A1M
(V-BL)
AND
(MD)
(BL-V)
or
LEADS
2872A2M
IN THE
Telephone
CABLE
Set
AT
KEY
Using
SYSTEM
3B
(MD)
END
Speakerphone$
ISS 5, SECTION 503-603-101
TOUCH-A-MATIC
TELEPHONESET
6-BUTTON LINE KEY
CORD
MOUNTING
L
,o8- 1
TYPE
LOUD
SPKR
|
|
I
•
D20N-87
/
k22_
POWER
|
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___
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I
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A25B CABLE
[
- TO KEY TELEPHONE SYSTEM
{NOTE 2)
NOTES:
1. STRAP NECESSARY ONLY IF SET IS ALSO
EQUIPPED WITH DIAL TONE DETECTOR TO
PROVIDE ONE-TOUCH CALLING OPTION.
2. IF POWER IS PROVIDED THROUGH KEY CABLE,
USE (BR-V) PAIR FOR 85-TYPE POWER UNIT
AND STRAP 24 TO ACt AND 49 TO AC2 ON
82B CONNECTING BLOCK.
Fig. 12--Block Diagram--2872AIM
(MD) or 2872A2M Telephone Set Using 4A Speakerphone
Page 45
503-603-101
.,
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Page
46
_
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(w)
I[
--
SECTION
(MD)
or 2872A2M
Telephone
Set--2/4-Wire
Connections
RT
>49
ISS 5, SECTION
(NOTE 2)
= >(_
503-603-101
.
TIP
(NOTE 1)
(G)
PSB-4
.
PSB-8
PSB-13
F-N_O_
--
I
I
POLARITY
i
GUARD
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--
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.
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(NOTE 1)
.L1
PSB-5
(NOTE 3)
__
(_
(_
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* INSULATED AND STORED
t DIODE AND CAPACITOR ORDEREDAND INSTALLED SEPARATELY
(_WITHOUT
(_WITH
RESTRICTED DIALING (FACTORY WIRED)
RESTRICTED DIALING
NOTES:
I. REVERSE POLARITY ON TIP AND RING LEADS
ON ALL LINES WITH RESTRICTED DIALING
2. FOR 2872AIM SET - (Y)
FOR 2872A2M SET - (BL)
\
3. FOR 2872AIM SET - (BL)
FOR 2872A2M SET - (Y)
Fig. 14--1_2872A1M
(MD)
or 2872A2M
Telephone
Set, Connections
for Restricted
Dialing
Option4
Page
47
SECTION 503-603-101
h"
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Page 48
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4
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o
ISS 5, SECTION
503-603-101
0TABLE N 11
TROUBLE
ANALYSIS
- 2872AIM
OR 2872A2M
,
TROUBLE
NUMBER
1
FAILURE
ADDITIONAL
Cannot transmit or
receive when off-hook
using handset
Mounting cord
improperly
inserted
at equipment
end
Check cord insertion
connections
Line lamp comes on
when handset is taken
off-hook
Bad connection
between handset
and telephone
set
1. Check handset
connections
2. Check handset
connections
Defective
Check handset
Cannot manually
when off-hook
dial
*Refer
Cannot manually
some digits when
off-hook
dial
receiver
and
cord
jack
Unknown
Replace
Dial tone is not present
when speakerphone
is
on
Open tip or ring
lead at line key
Check leads and connections
contact strips
Dial tone is present when
speakerphone
is on
Defective line switch
d-e or j-k contacts
Replace
Line lamp
Handset cord
improperly
inserted
into handset or jack
in telephone set
Check handset
handset
12-pin connector
or dial not
properly inserted
on pins on power
supply board
1. Check connector
2. Replace dial
Defective
616B jack
Replace
616B jack
Defective
network
Replace
telephone
comes
on
@
set off-hook
telephone
set*
telephone
cord and/or
insertion
set*
Bridged
No audible TOUCHTONE signal present
20-pin power supply
connector
not properly inserted on pins
on memory PWB
Check connector
Dial connectors
not
properly inserted
1. Check connector
2. Replace dial
Defective
PWB
Replace
memory
telephone
memory
Place bridged
from
set*
Clicking sounds or
damped TOUCH-TONE
signals heard when dial
buttons
are depressed
Cannot hang up set.
Some TOUCH-TONE
dial frequencies
incorrect
4
, ,,
REMEDIAL ACTION
Line lamp does not come
on when handset is taken
off-hook
Dial tone present, but
sidetone absent.
No
audible TOUCH-TONE
signal
3
POSSIBLE CAUSE
,,
Dead set on all lines
2
SYMPTOM
set on-hook
insertion
insertion
Unknown
Replace
Static discharge
damage
1. Consult Telco engineer for
proper grounding procedure
2. Replace memory
set*
Open or loose leads
to dial contacts
Check for proper insertion
leads into 10-position
dial
connector
Defective frequency
contacts on dial
Replace
of
dial
to 6.02 (4).
Page
49
SECTION
503-603-101
$ TABLE N (Contd)4
TROUBLE
TROUBLE
NUMBER
FAILURE
ANALYSIS-
ADDITIONAL
2872AIM
SYMPTOM
OR 2872A2M
POSSIBLE CAUSE
REMEDIAL ACTION
,,
4 (cont'd)
Defective
PWB
memory
Replace
memory.
Unknown
Replace
5
Cannot manually dial
off-hook for ac
power failure condition
Can manually dial offhook with ac power
Open strap lead between screw terminals
10 and 15 on PSB
Repair
telephone
Open path on PSB
Replace
6
RECORD lamp does
not function
properly
RECORD lamp does
not turn on when
RECORD button is
depressed or RECORD
lamp is on and cannot
be turned off
Battery not plugged
in, or defective
Plug in or replace
AC power
Check
or replace
.telephone
set*
strap
lead
set*
battery
'
•
RECORD lamp does not
turn on when RECORD
button is depressed
7
*Refer
Page
50
Cannot record
memory
to 6.02 (4).
into
not present
for commercial
Change
OFF
AC power unit not
plugged in or defective
Check or replace power unit
(should read 13.4 to 18 VAC
across screw terminals
30 and 31
on PSB)
Open in IW
Check
Memory, RECORD
OFF, or WAIT button
stuck down
Clear stuck
Defective lamp or
lamp driver circuit
Replace
memory
Defective logic reset
switch on line key
Replace
line key
Static discharge
damage
1. Consult your Telco engineer
for proper grounding
procedures
2. Replace memory
Unknown
Replace
telephone
Replace
memory
Replace
telephone
Lamp turns off' when
any memory button is
depressed
or
Lamp does not momentarily turn off when a
dial button is depressed
Defective
logic
RECORD lamp momentarily flashes when
RECORD button is
depressed
Stuck RECORD
button
Unknown
OFF
Wait contacts
closed
even when WAIT
button is not
depressed
Check
switch
power
Switch of D-180818
Kit of Parts in ON
position
position
to
IW and connection
button
RECORD
set*
set*
OFF button
1. Check WAIT button
2. Repalce memory
ISS 5, SECTION
503-603-101
$ TABLE N (Contd) 41
TROUBLE
ANALYSIS
- 2872AIM
OR 2872A2M
,
TROUBLE
NUMBER
8
FAILURE
Cannot record
_)roperly into the 31
memory positions or
into the LAST
NUMBER DIALED
position
ADDITIONAL
SYMPTOM
Warble tones heard when
automatically
dialing,
Get "cannot complete"
intercept
for automatic
or manual dialing
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
9
Cannot dial properly
from memory
,
,
,
POSSIBLE CAUSE
REMEDIAL ACTION
WAIT contacts closed
even when WAIT
button is not
depressed
Replace
Switch of D-180818
Kit of Parts in ON
position
Change
switch
Incorrect dial
contact sequence
'
Defective logic
Replace
dial
Replace
memory
Open circuit
Replace
telephone
on PSB
memory
position
set*
Did not record
properly
1. Record per 5.01
2. See No. 7
MB7 relay does not
operate (no clicking
sound heard) when
Battery not plugged
in (2872A2M
tel
set)
Plug battery
memory button is
depressed.
No audible TOUCH-TONE
signal present
Memory
mounted
Tighten
screws
Open circuit
power path
Defective
MB7 relay operates
(clicking sound heard)
but holds for less than
0.1 second for a 15
digit number
not securely
in
logic
in
memory
mounting
Check for proper strap lead
connections
on PSB.
See Fig. 9 [B]
Replace
memory
Defective line
switch h-i contacts
Replace
telephone
Incorrect
sequence
Replace
dial
dial
to OFF
set*
No audible TOUCHTONE signal present
Audible gap in train of
digits being dialed
_
Digits dialed
(fast dialer)
too rapidly
Noise on ac power
line (2872AIM)
Minimize wire length between
95B1 power unit and telephone
set.
Defective power
supply PWB
assembly (2872A2M)
Replace
telephone
set*
* Refer to 6.02 (4).
Page
51
SECTION
503-603-101
$ TABLE N
TROUBLE
TROUBLE
NUMBER
FAILURE
ANALYSIS
ADDITIONAL
(Contd) (I
- 2872AIM
SYMPTOM
OR 2872A2M
POSSIBLE CAUSE
REMEDIAL ACTION
,
9 (cont'd)
10
No digits or random
digits in memory
Cannot manually dial
off-hook for ac
power failure condition
(Wired for speakerphone option)
11
Cannot
phone
button
(Wired
phone
turn speakeron when ON
is depressed
for speakeroption)
AC power outage for
24 hours or longer
Reestablish
ac power and
rerecord numbers into memory
Disconnected
or defective battery
1. Plug in the battery
2. Allow the battery to be
charged for a minimum of
5 minutes.
Then momentarily
remove the 95B1 power unit
from the ac power outlet and
reinsert
3. If previously stored numbers
are not dialed from memory,
replace the battery
4. Repeat procedure
Defective power
supply circuit
Replace
telephone
No digits or all the same
digits in random memory locations
Defective
Replace
memory
Two or more memory
locations have some
digits which are usually
different from originally
recorded
digits
Static discharge
damage
1. Consult your Telco engineer
for proper grounding
procedures
2. Replace memory
Automatically
dials
through a "wait" after
Defective WAIT contacts or defective cir-
Replace
pausing momentarily
at the "wait" space
on a train of recorded
digits
cult components
Defective dial tone
detector
With a strap lead
between screw terminals
10 and 15 on PSB, can
manually dial off-hook
for ac power failure
condition
Defective circuit or
connections
on
D-180492
Kit of
Parts
1. Check connections
B, C, D, or E
2. Replace D-180492
Speakerphone
indicator
lamp does not turn on,
but line lamp is lit.
'
No dial tone heard, but
indicator lamp turns on
Handset
Place handset
Speakerphone
indicator
lamp does not turn on
and neither does line
lamp
Improper connections
or defective
85B1
power unit
memory
off-hook
Line button
depressed
i
*Refer
Page
52
to 6.02 (4).
,,
not
,
set*
memory
Replace dial tone detector PWB
assembly of D-18049_3 Kit of Parts
(if option is provided ).
Depress
per Table
Kit of Parts
on-hook
line button
1. Check connections
per
Table B, C, D, or E
2. Check for commercial
power
3. Check that 85B1 power unit
is plugged into commercial
ac power outlet
4. Check or replace 85B1 power
unit (should read 18 to 25
VAC across secondary
screw
terminals)
,
|
ISS 5, SECTION
I)TABLE
TROUBLE
J
ANALYSIS
N (Contd)a
-
2872AIM
i
TROUBLE
NUMBER
FAILURE
OR 2872A2M
,
ADDITIONAL SYMPTOM
i
POSSIBLE CAUSE
REMEDIAL ACTION
....
11 (cont'd)
12
13
14
15
*Refer
503-603-101
,
Speakerphone
indicator
lamp does not turn on
but line lamp lights
Improper connections
or defective 95B-Type
power unit
1. Check connections
2. Check or replace power unit
(should read 13.4 to 18 VAC
across screw terminals 30 and
31 on PSB)
With temporary
strap
lead added between
power supply screw terminals 16 and 17, speakerphone turns on when
ON button is depressed
Defective 327A relay,
MA3 relay or connecting leads on
D-180492 Kit of
Parts
Replace
When temporary
strap
lead added between
screw terminals 11 and
12 on TB1, speakerphone turns on when
ON button is depressed
Defective line switch
a-b contacts or connecting lead to PSB
1. Check (G-W) harness lead
between screw terminal 11
on TB1 and terminal 16 on
PSB
2. Replace telephone set*
Defective
phone
See appropriate
BSP
speaker-
D-180492
Kit of Parts
speakerphone
Cannot turn speakerphone off when handset is lifted off-hook
(Wired for speakerphone option)
Speakerphone
turns off
Short circuit between
when OFF button is
screw terminals 11
depressed
but turns back
and 12 on TB1
on when OFF button is -released
Defective line switch
a-b contacts
Clear short
RECORD lamp does
not turn off when
speakerphone
ON
Speakerphone
indicator
lamp does not turn on.
Line lamp is lit
Handset
Place handset
button for
is depressed
(Wired
speakerphone option)
With temporary
strap
lead added between
screw terminals 16 and
17 on power supply,
speakerphone
turns on
when ON button is
depressed
and RECORD
lamp goes off
LK relay circuit
defective on
D-180492
Kit of
Parts
Replace
D-180492
Kit of Parts
Operation
of RECORD
OFF button or line key
buttons turns RECORD
lamp off
Defective line
switch h-i contacts
Replace
telephone
set*
Cannot break dial
tone when dialing
with speakerphone
on (Wired for
speakerphone
option)
Cannot manually
when off-hook
Refer to trouble
number 3
Refer
When dial button is
depressed, audible level
of TOUCIt-TONE
signal
is high on speakerphone
Defective muting
circuit on PSB
Replace
Cannot hear tones
when dialing with
speakerphone
on
(Wired for speakerphone option)
With the speakerphone
ON button depressed,
the audible tone level
is normal
Physical spacing
between speakerphone loudspeaker
and transmitter
units
is too close
See appropraite
BSP for proper
units
Normal conversational
level on speakerphone
Defective muting
circuit on PSB
Replace
dial
off-hook
Replace
telephone
set*
on-hook
to trouble
number
telephone
3
set*
speakerphone
placement
of
telephone
set*
to 6:02 (4).
Page 53
SECTION
503-603-101
@TABLE N (Contd)@
TROUBLE
L
TROUBLE
NUMBER
16
FAILURE
ANALYSIS
, ,
- 2872AIM
OR 2872A2M
,
ADDITIONAL
SYMPTOM
POSSIBLE CAUSE
,
,
Cannot turn speakerphone off
(Wired for one-touch
option)
.
REMEDIAL ACTION
,,
. ,
Speakerphone
turns off
when OFF button is
depressed but turns on
when OFF button is
released
Black strap lead to
PSB-27 was not
insulated and stored
Remove
the strap lead
Speakerphone
turns off
and stays off when (YBL) lead is disconnected
from terminal 27 on
PSB and OFF button is
depressed
Defective output logic
level from memory
PWB
Replace
memory
Speakerphone
turns off
when handset is taken
off-hook
but turns on
when handset is placed
on-hook
Defective
D-180493
Parts
Replace dial tone detector board
assembly of D-180493 Kit of
Parts
Speakerphone
does
not turn on when a
MB7 relay does not
operate (no click
Battery not plugged
in (2872A2M
set)
Plug battery
memory button is
momentarily
depressed in the automatic dialing mode
(Wired for onetouch option)
heard)
button
3B (MD)speakerphone" V-BR lead
connected
to PSB-34
Insulate
connect
4A speakerphone
installed using 82A connecting block
Ch'xnge to 82B connecting
4A speakerphone
with
82B block strap not
placed on 82B block
Add strap from
in 82B block
With temporary
strap between screw terminals
28 and 29 on PSB, speakerphone turns on when
a memory button is
One-touch
calling
switch turned off or
defective
1. Turn one-touch
calling switch
on
2. Replace one-touch
calling
switch assembly of D-180493
Kit of Parts
depressed
Defective dial tone
detector D-180493
Kit of Parts
Replace dial tone detector PWB
assembly of D-180493
Kit of
Parts
With temporary
strap
between screw terminals 17 and 34 on PSB,
speakerphone
turns on.
Defective connections between
dial
tone detector and
PSB
Check (Y-G) and (G-Y) leads to
PSB terminals 17 and 34,
respectively
Defective dial tone
detector
D-180493
Kit of Parts
Replace dial tone detector PWB
assembly of D-180493
Kit of
Parts
Defective
circuit
1. Replace memory
2. Replace dial tone detector
PWB assembly of D-180493
Kit of Parts
.,_
17
18
*Refer
Page
54
Delay time between
depression
of a
memory button and
initiation of automatic dialing exceeds 3 seconds
(Wired for onetouch option)
to 6.02 (4).
when memory
is depressed
circuit on
Kit of
timing
in
and store V-BR lead, and
O-V lead to PSB-34
terminal
block
10 to 35
ISS 5, SECTION
tTABLE
TROUBLE
N (Contd) 41
ANALYSIS
-
2872AIM
OR 2872A2M
,
TROUBLE
NUMBER
19
FAILURE
i
ADDITIONAL SYMPTOM
Speakerphone
turns
on but set does not
automatically
dial
when memory
button is depressed
(Wired for onetouch option)
20
Automatic
dialing
commences
for no
apparent
reason
(wired for onetouch option)
21
Calls not completed
if handset is quickly
taken off-hook
while
automatically
dialing
on a speakerphone
22
Set dials automatically but does not
wait for dial tone
(Wired for onetouch calling)
503-603-101
POSSIBLE CAUSE
,
,
,
REMEDIAL ACTION
Black strap leads
were not lifted from
PSB terminals 19 and
26 when option was
wired
Insulate
Set dials when screw
terminals 26 and 29 on
PSB are temporarily
shorted
Precise dial tone
present
1. Check CO line for presence of
precise 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
Set does not dial from
memory when screw
terminals 26 and 29 on
PSB are temporarily
shorted
Defective
Automatic
dialing
terminated
before
digits are dialed
is
all
not
logic
Replace
and store strap
leads.
memory
Static discharge
damage
1. Consult your Telco engineer
for proper grounding
procedures
2. Replace memory
Marginal switchhook
sequence
between
a-b and h-i contacts
Remove handset more slowly
from handset cradle
Noise on line
1. Add 5pf capacitor
between
PSB-21 and PSB-26
2. Remove above capacitor
and
add resistor (10K_-50K_])
in
series with (G-R) dial tone
detector input lead.
Battery not plugged
in (2872A2M
tel set)
Plug battery
Precise TOUCHTONE Q dial tone
Make sure precise (350 Hz and
440 Hz) dial tone is present
may not be present
Memory not securely
mounted
Tighten
screws
|
23
Cannot dial properly from memory
when on handset
(Wired with dial tone
detector option)
*Refer
MB7 relay does not
operate (no click heard)
when memory
button
is depressed.
in
memory
mounting
Improper installation
of dial tone detector,
D-180493
Check connections
installation
for D-180493
Same as above -Addition of strap lead
between PSB terminals
26 and 29 does not
correct problem
Improper connection
to or defective
memory
1. Check connector
2. Replace memory
Addition of strap lead
between PSB terminals
26 and 29 corrects
problem
Defective
memory
Replace
memory
Defective
detector
Unknown
dial tone
Replace
detector
Replace
D-180493
dial tone
telephone
set*
cable
to 6.02 (4).
Page
55
SECTION
503-603-101
$ TABLE N (Contd)
TROUBLE
ANALYSIS
- 2872AIM
4
OR 2872A2M
,,,
TROUBLE
NUMBER
24
Page 56
56 Pages
FAILURE
Hum or Noise
caused by electrical
apparatus
(light
dimmer switch, etc)
ADDITIONAL
SYMPTOM
POSSIBLE CAUSE
Unbalanced
telephone
line
REMEDIAL ACTION
Check for unintentional
connections
that might
cause an unbalanced
telephone
line