Bell 852A User manual

BELL SYSTEM PRACTICES
AT&TCo
Standard
1. GENERAL
TELEPHONE SETS
852A AND 2852A
Application
SECTION 503-701-102
Issue
1, January 1975
1.01 This section contains identification, installation,
connections,
and maintenance information
for the 852A and 2852A telephone sets.
2. IDENTIFICATION
Purpose
2.02
Use d wit h ce n t r a I0 ff ice, PBX 0r
intercommunicating line circuits
in lAl, lA2,
or 6A key telephone systems (KTS). These sets
are not for use with lA KTS.
2.03 The 852A and 2852A telephone sets may be
used with
either 3- or 4-type speakerphone.
2.01 The 852A (rotary) and 2852A (TOUCH-TONEiR:,
dial) (Fig. 1) telephone sets are wall-mounted,
lO-button, key telephone
sets equipped to provide
standard key system features.
The limited number of mounting cord
conductors can place a restriction on
using these telephone sets with 3-type
speakerphone (see 3.11).
Fig. 1-2852A Telephone Set
Ordering Guide
2.04 To order acomplete telephone set, list as
follows:
•Set, Telephone, 852A-*
•Set, Telephone, 2852A-"
Complete code b~' adding color su ffix [rom Table A.
TABLE A
COLOR
ORDERING GUIDE
HOUSING, CORDS,
COORDINATED
AND HANDSET COLOR
COLOR
SUFFIX
COLOR
SUFFIX
Black
-03
Charcoal
-70
Ivory
-50
Muted Ivory
-80
Green
-51
Light Green
-71
Red
-53
Muted Red ----B9
Yellow
-56
Light Yellow
-72
White
-58
Light Gray -73
Light Beige
----BO Muted Beige
-75
Aqua Blue
----B2
Muted Blue
-76
© American Telephone and Telegraph Compan.v. U)7:)
Printed in U.S.A. Page 1

SECTION 503-701-102
2.05 Replaceable Components:
•Housing, 852A-"
•Plate, Face, 85IA-* (852A telephone set)
•Plate, Face,
285IA-' (2852A telephone set)
•Set, Hand,
G3A6-*
•Ringer, PIB
•Dial, 8R-58 (852A telephone set)
•Dial, 35AF3A (2852A telephone set)
•Key, 652A5
•Lamp,
5IA
•P-22F438 Resonator Assembly
•P-23FIOI Collar
•KS-204I9LI Buzzer
2.06
Optional Components (order separately):
•KS-15724L1 Diode (for use with station busy
lamp)
•P-90D170 Polarity Guard (optional for 2852A
set)
•KS-8109L2
Buzzer (mounting provided for
one buzzer)
•KS-20419L1 Buzzer (mounting provided for
two additional buzzers)
•
8C-58 Dial (for 852A set used with speakerphone)
Design Features
•10-button (9-line pickup and hold)
•All pickup
buttons convertible to signaling
•
Hold key can be illuminated (lamp not
furnished)
•
Telephone set termination by means of
connector
Page 2
•KS-20419L1 buzzer provided and connected
to dedicated connector leads
•
Provisions for mounting one KS-8109L2
buzzer
or two additional KS-20419L1 buzzers
on chassis assembly
•Provisions for adding polarity
guard assembly
to 2852A telephone
set (optional)
•An
access hole is provided in the PI-type
ringer for biasing spring adjustment. Refer
to Section 501-259-101.
fr
i? < Limited number of connector leads
~ restricts number of optional features
D which may be provided
Operating Features
2.07 The operating features for the 852A and
2852A telephone sets are the same as standard
6-button key telephone
sets and CALL-DIRECTOR®
type telephone sets.
3. INSTALLATION
3.01 When mounting
the 852A or 2852A telephone
set, select alocation which provides
at least
6inches of clearance on all sides to permit removal
of the handset and for maintenance.
3.02 Remove faceplate by using aKS-16750 type
releaser or equivalent in catch in bottom of
faceplate.
3.03 Remove housing by loosening two captive
screws under faceplate area.
3.04 To expose the mounting holes, the hinged
chassis assembly
must be lowered by loosening
the captive screws holding the top of the chassis.
Where desired, the chassis assembly can be removed
by
springing the hinge brackets sufficiently to
clear the pins. The basepan can be mounted
directly to the wall using the keyhole slots, or
holes are provided for mounting over an electrical
outlet box.
Caution: A
void damage to wall 01' telephone
set whenever chassis is in lowered position.

Fig. 2-852A or 2852A Telephone Set with Hinged
Chassis Lowered
3.05
Sets can be wired using a connector cable.
When mounted over an outlet box, bring
wiring through opening in basepan before mounting.
Allow 6-10 inches of cable inside set for routing
and terminating and check that sufficient slack is
provided to permit hinging action of chassis
assembly.
3.06 To install housing:
(1) If chassis assembly is in lowered position,
raise and fasten in place with two captive
screws.
(2) Install collar on key.
(3) Withdraw the two mounting screws until
they are held in the housing by their threads.
ISS 1, SECTION 503-701-102
With both line switch plungers fully lifted, move
the housing directly into position around the
telephone set. Depress both plungers to their
on-hook position. Continue moving the housing
into position
against the base. Release plungers.
(4) Fasten housing in place with two captive
screws.
(5) Check complete operation of line switch.
3.07 Use a Form E-4203-G or E-4204-G as a
station number card for rotary sets and
Form E-5002-A or E-5002-B for aTOUCH-TON E
station. Insert number card under fingerwheel of
the 8-type dial or under card retainer of the 2851A
faceplate.
3.08 To install faceplate:
(1) Insert tabs on faceplate into slots of housing.
Use aKS-16750
type releaser or equivalent
to depress the tab of the faceplate retainer clip
while
seating the faceplate. To insure proper
positioning of the retainer clip, raise the handle
of the releaser well above horizontal before
withdrawing the tool.
(2) If the latching characteristic of the P-269524
retainer clip is inadequate, replace with a
840155618 clip.
3.09 The 652A5 key uses aE-5837 form (key
button designation tabs). To install, squeeze
sides of cap to remove it from key button and
insert designation tab. When replacing cap or key
button make sure assembly snaps into place. If
cap does not snap in place properly, rotate 90
degrees.
Optional Features
3.10
Individual signaling may be provided by
converting alocking key button to nonlocking.
Remove
the P-28E773 locking pin from the button
to be converted, and make wiring changes shown
in Table E.
3.11 When providing 3-type speakerphone with
the 852A or 2852A telephone set and the
speakerphone leads are connected to the telephone
sets through the connector cable the use of last
two pick-up buttons must be sacrificed.
Page 3

SECTION 503-701-102
3.12
To provide the maximum key features plus
the 3-type speakerphone feature, install the
55-type
control unit at the same location as the
telephone set and connect the speakerphone leads
to the telephone
set using an auxiliary mounting
cord (refer to Table G).
3.13 If 4-type speakerphone is provided the 223A
adapter is used to interconnect the 4-type
speakerphone system (transmitter,
loudspeaker set,
and power unit).
3.14 For connections to the 3- or 4-type speakerphone
system, refer to appropriate section in
Division 512.
3.15 When adding speakerphone to 852A telephone
sets; the 8R dial must be replaced by an
8C dial (ordered separately) to provide the additional
off-normal contacts required for speakerphone
connection.
3.16 When an 852A or 2852A telephone set is
multipled with
sets furnishing speakerphone
features, certain leads must be disconnected,
insulated, and stored to avoid interference with
working circuits. The designation
of leads to be
removed
are as follows: T1, R1, P3 or IT, P4 or
IR, AG, and LK. .
3.17 The 852A and 2852A tvephone sets are
equipped with aKS-20419L1 (10 volt AC
only) buzzer mounted
on the chassis. The buzzer
leads
are connected to (0- Y) and (Y -0) connector
leads. Plastic screw
grommets and mounting screws
are provided to install one KS-8109L2 or two
additional KS-20419L1 buzzers, if required.
3.18 Polarity Guard (2852A only): Should be
used only when specified by local instructions
for end-to-end signaling installations where
battery
and ground reversals may be encountered. A
P-90D170 polarity
guard assembly may be installed
on the chassis below the dial.
3.19 Operational tests of all features should be
made to insure proper operation and customer
satisfaction.
3.20 Where conditions warrant, the G3A6 handset
supplied with these sets can be replaced with
other types as follows:
•
For impaired hearing -G6-type
Page 4
• For weak speech -G7-type
•
For noisy location -G8-type or D-180413
Refer to Division 501 for connections of these
handsets.
4. CONNECTIONS
~ Due to the liInited number of conductors
~ the 852A and 2852A telephone sets do
not follow standard wiring an-angements.
4.01 To provide connector leads fer illuminating
the HOLD button, the
ringer or buzzer leads
must be used, meaning only two of the three options
(ringer, buzzer,
or hold lamp) may be provided at
the same time.
4.02 To provide station busy lamp, modify the
telephone set per Table B. The KS-15724L1
diode is
used to prevent false busy signals and
must be ordered and installed separately.
4.03 To provide priority hold (I HOLD) modify
the telephone
set per Table C.
4.04 To provide individual signaling, modify the
telephone set by converting the proper
button(s) and make wiring changes per Table E.
The key and its associated cord assembly are
adaptable for individual signaling but not for common
signaling.
4.05 To provide 3-type speakerphone leads in
the connector cable, the buzzer leads along
with the lamp and lamp ground leads from the 8th
and 9th pick-up key position must be used. Refer
to Table Ffor connections.
4.06 Connections in Table G are used when the
control unit
is located close to the telephone
set and a D10R mounting cord is used as an
auxiliary cord for connecting the 3-type speakerphone
leads to the telephone set. With this
arrangement
the transmitter and loudspeaker may be connected
directly to the control unit.
4.07 To provide 4-type speakerphone connections,
connect
the M16C cord as shown in Table
H.
'.,

5. MAINTENANCE
5.01 Maintenance replacement should be limited
to the following:
•Complete teiephone
sets
•Optional items
•Replaceable components
5.02 When necessary to remove housing, the
faceplate must first be removed by using a
KS-16750
type releaser or equivalent in catch in
bottom of faceplate. Housing can then be removed
by loosening two captive
screws under faceplate
area.
5.03 When dial replacement is necessary in the
852A telephone set, use an 8R dial for
nonspeakerphone sets and an 8C dial for sets with
speakerphone. Remove dial by loosening mounting
screws and springing dial
brackets sufficiently to
release dial from locating pins.
Left hand bracket
may have to be moved slightly toward right side
of set to permit dial to clear screw terminal field
TABLE B
STATION BUSY LAMP CONNECTIONS
LEAD
OPERATION
Hold Key
Remove from terminal 11
(G-W) and connect to 18
KS-15724Ll
Connect as shown
Diode
18
11
~
Connector (Y-O) Remove from 20 con~
(Note)
nect to 11
Note: Use spare connector lead if (Y-O)
lead is used to provide other options.
ISS 1, SECTION 503-701-102
(or loosen and move screw terminal field). Transfer
adapter brackets from dial being replaced to new
dial.
5.04 Maintenance of the 35AF3A (TOUCH-TONE
dial) dial
is not recommended and the dial
should be replaced. Adapter brackets are not
involved when replacing the TOUCH-TONE dial.
5.05 For maintenance of buzzers, dials, speakerphone
components, and polarity guard, refer to
appropriate sections pertaining to these items.
5.06 Access to the ringer is obtained by lowering
the hinged chassis assembly. The ringer
can be removed by loosening the two shouldered
mounting screws.
5.07 The current production 652A keys have been
modified for easy lamp replacement by merely
removing the lamp cap and inserting a553-type
tool
through the hole in the top of the button. In
early production keys it was necessary to remove
faceplate, housing, key collar, and button for lamp
replacement.
TABLE C
I
HOLD CONNECTIONS (NOTE)
LEAD
REMOVE CONNECT
FROM TO
Hold (G-W) 11
12
Key (BK-BL)
12 11
SP Lead -Use (Y-O)*
or spare connector 20 15
conductor
* (Y-O) lead may be used unless connected for
other options.
Page 5

SECTION 503-701-102
PART OF 652A5 KEY
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STRAP
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42 17 26 27 3 28 4 29 30 6 31 7 32 33 9 34 10
35 36 12 37
PART OF CONNECTOR AND TERMINAL BOARD ASSE MBLY
Fig. 3-852A and 2852A Telephone Set, Connections (Sheet 1of 4)
Page 6

ISS 1, SECTION 503-701-102
PART OF 652A5 KEY
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Fig. 3-852A and 2852A Telephone Set, Connections (Sheet 2 of 4)
Page 7

SECTION 503-701-102
852-TYPE TELEPHONE SET
R
TR
SET
liNE SWITCH
8R DIAL
425E OR 4228R NETWORK
H4CJ CORD G3A6 HAND
T
(0) (0)
R
(G)
(BR)
(W)
OFF +
(W)
R
(BK)
NORM
I ~
11
9
(Bl)
If ~
(R) F
1\
17 I If
-
1\ 1\
I
(Bl)
OR
~r
~·C
(G)
RR
(W)
PULSE C
j'GN
TB
de
(W)
RCI
~
PIB RINGER
(W)
*A
(R)
K
Cbt
LI
I
aT]
0I
(S)
~
;;r::
(R)
•
l2
( BK)
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0
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(Y-S)
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Fig. 3-852A and 2852A Telephone Set, Connections (Sheet 3of 4)
Page 8

N
~
w
W
J:
(f)
::E
o
a:
...
ISS 1, SECTION 503-701-102
LINE SWITCH
2852-TYPE TELEPHONE SET
H4CJ CORD
G 3A6 HANDSET
425K OR 4228S NETWORK
(WI
,
RCVR
(W)
I
(
R)'
I
..-l
( BK)
"?J TRMTR
T (0)
,....F (G)
35AF3A DIAL
A'
~
R (GI
3
p
rq-
)
~
1
U~
(0)
(BK)
3
( RI
Tl
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v
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(2JL2
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(S-Y)
NOTES:
I. TERMINAL 19 IS ASPARE TERMINAL IN THE
B52-TYPE TELEPHONE SET.
2. LINE SWITCH OFF-HOOK SEQUENCE:
(I ) be MAKES
(2 I de AND fg MAKES
(3) ab BREAKS
Fig. 3-852A and 2852A Telephone Set, Connections (Sheet 4 of 4)
Page 9

SECTION 503-701-102
TABLE D
POLARITY GUARD CONNECTIONS
FOR 2852A
TELEPHONE SET (P-90D170 GUARD ASSEMBLY)
REMOVE
FROM CONNECT TO
WIRE
OR LEAD COLOR
NET.
GUARD
ASSY.
NET.
Dial
Line Switch
Guard
Assembly
BK
_._----_.
G-W
----. -.~-_.-
W
G
W
RR 4= T
--_.-.- -. - - ---+-------- --
C S
---_. - -_._-------
C S
RR
C
Note: For use when specified by local instruc-
tiOliS for end-to-end signaling installations.
TABLE E
PICKUP
SIGNAL KEY CONVERSION
CONVERSION OPTION
652A5 KEY LEADS
(NOTE)
o-w
Sow
G-R BL-BK BR-BK
BK-BR BK-BL R-G W-S
HPPPPPPPPP
12 9 9
12 12 12 9 9 9
HPPPPPPPPS
12 9 9
12 12 12 9 9 7
HPPPPPPPSS
12
99
12 12 12
97 7
HPPPPPPSSS 12
9 9
12 12 12 77 7
HPPPPPSSSS
12
9 9
12 12 7 7 77
HPPPPSSSSS
12 9 9
12 7 7 7 7 7
Note: Move (0- Y) connector lead from terminal 21 to terminal 7. Beyond five signal conversions
strap terminal 7 to 8 and move the signal leads consecutively to terminal 8. Example: (BL-BK)
lead
from terminal 12 to 8, then (G-R) from 9 to 8etc.
Page 10

TABLE F
3-TYPE SPEAKERPHONE CONNECTIONS
(CONTROL UNIT AND APPARATUS
CABINET AT SAME LOCATION)
SPEAKER-
PHONE
LEAD
REMOVE CONNECT
LEADS
COLOR
FROM TERM TOTERM
T1
V-G
14 19
(Note 1)
Rl
G-V
13 1
AG Y-O
20 11
LK O-Y 21
10
P3 or IT V-BR 5 4
P4
of IR
BR-V 6
(Drill
Al
O-W
-3
Nott?s:
1. Add strap from terminal 19 to network
terminal C (852A only)
2. Replace 8R with 8C dial on 852A
telephone
sets. Connect (Y) leads
of 8C dial to terminals 4and 8.
t Network terminal.
0852A Telephone Set
D2852A Telephone Set
TABLE H
ISS 1, SECTION 503-701-102
TABLE G
3-TYPE SPEAKERPHONE CONNECTIONS
(USING
AUXILIARY MOUNTING CORD)
LEAD
DIOR CORD TEL SET
DESIG COLOR
TERM.
Tl
W-BL
(§) ~
Rl BL-W 1
AG
WoO
11
LK O-W 10
P3 or IT W-G 4
P4 or IR G-W
0
[gJ
Al W-BR 3
Note: Replace 8R dial with 8C Dial
on 852A telephone set. Cor-
rect (Y) leads of 8C dial to
terminals 4 and 8.
tTerminals on network.
o 852A Telephone Set
o 2852A Telephone Set
4A SPEAKERPHONE CONNECTIONS
LEAD
M16C CORD TEL SET
DESIG COLOR
TERM.
Tl
W-BL
@
~
Rl
BL-W 1
AG
WoO
11
LK
O-W 10
P3 or IT
W-G
4
P4
of IR
G-W
CD
IL1 tl
Al
W-BR 3
Note: Replace 8R dial with 8C dial
on 852A telephone sets.
Connect (Y) leads of 8C dial
to terminal 4 and 8.
t Terminal on network.
0852A Telephone Set
o 2852A Telephone Set
Page 11

SECTION 503-701-102
TABLE I
CONNECTOR
AND CABLE CONDUCTOR ASSIGNMENT
CONNECTOR AND TERM. BOARD ASSY
A25B CONN CABLE
TEL SET LEAD LEAD PLUG CONN
LEAD LEAD
TERM COLOR DESIG TERM TERM DESIG COLOR
BL-W
R1 1 R
BL-W
Line 1
W-BL
T26 26 T
W-BL
(Dlue)
WoO A27 27 AWoO
Plug G-W
L 3 3L
G-W
W-G LG 28 28 LG
W-G
BR-W R44R
BR-W
Line 2
W-BR T29 29 T
W-BR
( Orang-e)
W-S
A or S30 30 A
or S
W-S
Plug BL-R L 6 6L
BL-R
R-BL LG
:n
31 LG
R-BL
O-R
R 7 7 R
O-R
Line ~ R-O
T32 32 T
R-O
( Green)
R-G A
or S33 33 A or S
R-G
Plug
BR-R L 9 9 L
BR-R
R-BR LG 34 34
LG R-BR
S-R
R10 10 R S-R
l.ine 4R-S
l' 35 35 T
R-S
(Brown)
BK-Bl.
A or S36 36 A
or S BK-BL
Plug O-BK L12 12 L
O-BK
BK-O
LG
:n 37 LG
BK-O
C-BK H
1~ 13 R G-RK
Line 5 BK-G
T38 38 T
BK-G
( Slate) BK-BR A or S ~fJ
39 A or S BK-BR
Plug S-BK L15 15 L
S-BK
BK-S
I.G 40 40
LG
BK-S
BL-Y RHi
If)
R BL-Y
Line li Y-BL T
41 41
T Y-RL
(White)
BR-BK
A 01' S14
14
A or S BR-BK
Plug'
G-Y
LIS IS LG-Y
Y-G LG 43
43
LG Y-G
BH-Y R
l!l
19 R
RR-Y
Line 7 Y-RR T
4..1 44
l' Y-BR
(Red)
BL-RK A or S 11 11
A or S
BL-BK
Plug BL-V I.
21
21
L
BL-V
V-BL
u;
4li
4G
LG
V-BL
Lille ~
O-V R22 22 RO-V
(Hlal·k I
V·O
T47 47 TV-O
G-R
A 01' S 8 8A
or S
G-R
Plug (i
BH·V L, P4 or IR
24 24
L, P4 or IR
J3R-V
;)
\'-BR
LG, P3 or IT
49
..19
LG, P3 or IT
\'-BR
S-V
R25 25 R
S-V
J.i lie !l V-S
T50 50
l' V-S
(Yell!'w) SoW A
01' S5 5 A or SSoW
Plug l:~
G-\'
L 01' Rl
2~
23
Lor Rl G-V
14
\'-G
U; 01' 1'1
..18 48 I.G
01' 1'1 V-G
:l
O-W
AI 2 2 At
O-W
21
O-Y
HZ, SG, LK, 17 17 BZ,
SG, LK, O-Y
01' Spare or Spare
20
Y-O
8Z1, 81.. A(;, 42
42
BZl, BL, AG,
Y-O
or Spare
or Spare
.-\
Soy
R 01' Rl 20 20 R
or Rl
Soy
GY-S B
01' Bl 45 4fi B
or Bl
Y-S
Page 12
12
Pages