Bell System Practices 853AM Guide

BELL SYSTEM PRACTICES
AT& TCo Standard
SECTION 503-603-130
Issue 1, November 1980
853AM AND 2853AM TELEPHONE SETS
I DENT I FICA TION, INSTALLATION, CONNECTIONS , AND MAINTENANCE
1. GENERAL
1.01 This section contains information on the
853AM (Rotary Dial) and 2853AM
(TOUCH-TONE® Dial) telephone sets (Fig. 1, 2,
4, and 5).
1. 02 Whenever this section is reissued, the reason(s)
for reissue will
be listed in this paragraph.
Fig. 1- 2853AM Telephone Set
Fig. 2- 2853AM Telephone Set (Housing Removed)
2. IDENTIFICATION
2.
01 The 853AM and 2853AM telephone sets are
modular sets equipped with a
G15A handset
and H4DU handset cord. These sets are wall-mounted
6-button key sets intended for intercom use with
COM KEY* 718 or 2152 communication system.
They are similiar
in appearance to the standard
6-button wall telephone set.
*Trademark of
AT&T Co.
NOTICE
Not for use or disclosure outside the
Bell System except under written agreement
Printed in U.S.A. Page 1

SECTION 503-603-130
Fig. 3-853AM or 2853AM Telephone Set With Hinged
Chassis Assembly in Lowered Position
2.02 These sets are available in Ivory (-50) only
and are shipped as complete telephone sets.
2.03 These sets provide services such as message
waiting, button illumination, and intercom.
They are equipped with a loudspeaker to provide
tone and
voice signaling. The volume level is
adjusted
by a control knob located on the front of
the set,
just to the right of the dial (Fig. 1).
2.04 The hands-free answer on intercom (HFAI)
is an optional feature available
in COM
KEY 2152 communication system installations. This
feature consists of a 683AE
transmitter (ordered
separately) which is arranged for field installation.
Page 2
2.05 If wall mounting is desired, the 127A bracket
(ordered separately) should
be used.
2.06 Ordering Guide.
(a) Telephone Sets:
• Set, Telephone, 853AM-50
• Set, Telephone, 2853AM-50.
(b) Modular Items:
• Housing, 853A-50
• Faceplate, 853A-80
• Faceplate, 2853A-80
• Handset, G15A-50
• Cord, Handset, H4DU-50.
(c) Options:
• Buzzer
• HFAI (Hands Free Answer on Intercom)
• HFAI Transmitter Wall Mounting Bracket
• Amplifier Type Handsets.
(d) Replaceable Components:
• Dial, 8RA or 35Y3A
• Key, 635A5
• 812365039 (P-23F503) Key Collar
• Lamp,
51A (lOV) for all key positions
• All items listed as modular.
3. INSTALLATION
3.01 When mounting the 853AM or 2853AM
telephone set, select a location which provides
at least 6 inches of clearance on all sides to permit
removal of the handset, and for maintenance.
3.02 The telephone set should be mounted before
installing the modular items, and make sure

ISS 1, SECTION S03-603-130
Fig. 4-Removing Terminal Board Mounting Screw
that options are installed before the telephone set
is connected.
To expose the mounting holes, the
hinged chassis assembly
must be lowered by
loosening the captive screws (Fig.
3) holding the
top of the chassis. For ease of installation the
chassis assembly can
be removed from the base
pan
by springing the hinged brackets sufficiently
to clear the pins. The base pan can
be mounted
directly to the wall using the keyhole slots, or
holes provided for mounting over an electrical outlet
box.
Warning: Avoid damage to wall or
telephone set whenever chassis is in
lowered position.
The 853AM and 2853AM telephone sets
are factory wired for two intercom
lines only; for the third intercom line
refer to (Fig. 5 and 6).
3.03 The first three pickup positions are arranged
for intercom use only. RED button position
Page 3

SECTION 503-603-130
may be illuminated for message waiting use.
The lamp must
be ordered separately.
3.04 The 853AM and 2853AM telephone sets are
equipped with a KS-16671L1 connector. An
A25B connector cable is required to connect set to
key equipment. Check before restoring chassis
assembly
that sufficient slack is provided to permit
proper hinging action (Fig.
3).
3.05 Key Features.
• All intercom positions of the 635A5 key are
convertable to signaling
by the removal of
the
812857738 (P-28E773) locking pins from
the positions involved and making the
necessary wiring change.
• Lamp and set wiring are provided for
illuminating intercom key positions. To
illuminate the RED button position, the
lamp must
be ordered separately.
• Line appearances on the key can be rearranged
by switching the color coded plugs on the
rear of the
key or rearrangement of the
cross connections
at the key equipment.
3.06 When installing H4DU handsetcord in 853AM
or 2853AM telephone sets, either end of
cord will fit in telephone
set base or handset.
3.07
Care should be taken so plug will not
be forced into socket in a reverse
condition, as the cord retaining clip
will not lock in place and the cord
contacts will not mate.
To install housing proceed as follows.
(1) If chassis assembly is in lowered position,
raise and fasten in place with two captive
screws (Fig. 3).
(2) Install collar on key.
(3) Withdraw the two mounting screws until
they are held in the housing by their threads.
With both line switch plungers fully lifted, move
the housing directly into position around the
telephone set, making sure
that the two left
housing ribs fit into the corresponding slots
on
the network and terminal board assembly.
Depress both plungers to their on-hook position.
Page 4
Continue working the housing into position against
base. Release plungers.
(4) Fasten housing in place with two captive
screws.
(5) Check complete operation of line switch.
3.08 Use Form E-10361, E-10365, or E-10369 as
a station number card for a TOUCH-TONE
station and Form E-10360 or E-10364 for rotary
sets.
3.09 To install faceplate proceed as follows.
(1) Insert tabs on faceplate into slots of housing.
Use a KS-21107 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, as shown
in Fig. 4 before withdrawing the tool.
(2) If installing 2853A faceplate (2853AM telephone
set) place station number card in from front
of faceplate
in standard manner.
3.10 The 635A5 key uses a (802695361) E-5837
form (key button designation tabs).
To
install, squeeze sides of cap to remove 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.
3.11 The 127 A bracket is a molded plastic design
that mounts on the wall using three No. 6
screws (provided locally). The 683AE
transmitter
slides in from the top and is held in place by
retaining fingers on the bracket.
4. CONNECTIONS
4.01 All leads or
straps involved in service or
option changes
are equipped with spade
tips.
If not factory terminated, leads are insulated
and stored.
4.02 Sets are equipped with the KS-16671Ll plug
(Fig.
3). An A25B connector cable is required
for termination.

4.03 For connections, refer to Fig. 6 and 7. For
the
third intercom line (used in COM KEY
2152 communication system) connect as shown in
Note, Fig. 6 or
7.
4.04 For connecting the HF AI feature (COM
KEY 2152 communication system only) refer
to Table
A.
Fig. 5-lnstalling 853A Faceplate
5. MAINTENANCE
5.01 Maintenance replacement should
be limited
to the following:
• Complete telephone sets
• Replaceable components.
5.02 When dial replacement is necessary in the
853AM telephone set, use an 8RA dial. First
remove terminal board mounting screw as shown
in Fig.
4. Remove dial by loosening adapter
ISS 1, SECTION 503-603-130
mounting screws and springing dial brackets
sufficiently to release dial from locating pins.
Transfer adapter brackets from dial being replaced
to new dial.
5.03 When dial replacement is necessary in the
2853AM telephone set, use the 35Y3A dial.
First remove terminal board mounting screw as
shown
in Fig. 4. Then rotate terminal board
upward to gain access to dial mountin screws.
5. 04 Maintenance of the 35-type TOUCH-TONE
dial is not recommended and the dial should
be replaced. Adapter brackets are not involved
when replacing the TOUCH-TONE dial.
5.05 When necessary to remove housing, the
faceplate must first be removed by using a
KS-21107 type releaser (Fig. 5) or equivalent in
catch in botton
of faceplate. Housing can then be
removed by loosening two captive screws under
faceplate area.
5.06 The current production 635-type keys have
been modified for easy lamp replacement
by merely removing the lamp cap and inserting a
553-type tool through the hole in the top of the
button.
• TABLE A.
HFAI CONNECTIONS
REMOVE
CONNECT TO
APPARATUS
LEAD
FROM
635A5
COLOR
NET.
KEY
NET.
TERM.
TERM.
TERM.
Wiring BL-V G L2
Harness LG
W-BL (Lamp
GRDi
BL-W 1
683AE
W-0 4
TRMTR
0-W 3
G-W L2
W-G G
W-BR
A
BR-W K
Page 5

SECTION 503-603-130
C ONNE C TOR
LEAD WIRING
DESIG NATI ON HARNE SS
TERN\ NAL
60AAD
6l 5A5 KEY LINE SWIT CH
l
~ll o!oiN~o ~T~o!'' s T~u~~~~ < v~~~>iE~~~~~
1
~~~Jl=:=:=:=:=:=:=:=:=:=:=:=:=::!::::=:=:=)~i[=::
HFAI (46 MI C. RETURN (S-V
C OM K EY 2'; 15 0
Z152 ONL Y 501 MI C. RETURN (V-S) 4 (BL -V)
V Ol CE IN (6L-V) "'
COM KEY
716 OR Z152
46 A
lf> G ND (V -BL) (V-6L
2:=f: A ~~~ - [ 2 1 ~ ~ ( = C) ===Jt] (V ~ - ~ O) h==l====~~~~~dt==========================:tjic===~~ (V ~ -~O ~ ) ----
~ ~ ;_ -24V 6 6R-V - 10 - 7 S a
44
f-~~ A ~1--------~~ ( ~ Y- ~~~ ) ~~----~~1~1-----~~------------------------_,~ (Y ~ ) --~~b
~-t~ S ~T A ~ B U~S ~ Y -----t~ (G~ -~V ) ~-t---=~~ 6 ~~@I:t========================~j r@ ' 6 rR \ ~~ *~~~---
2l , 1l G G) d ~. (W)
0 14 (6L) d' o' (6L)
0 (R)
0
0
49 (V-6R)
(G)
~ 6
~ 5
IG-W) ~
4
(6K-6L ~ S:
rv.6Rl ~ ~ >+
6K) LG )-'-
15
~-J- 1 ~ 1~R --------~ ~(S~-B~K~) ~J-------~-f.-_f+---~~~--~~ ~ ;~ ) ~ 6K ~ ) ~~ A ~ - ~ 6 - L ~ A~CK :t ~ ~
(G-Y)
11T (6K-S) 6K-S
4
~
40 ~-J_.:.:.:_ ______ --J~ =:c:.;_ --J.--------+-t-t-+~="-'------.~ l )+----4' !C1
------+? 2 ~
11 l (Y -6L) (Y BL) ~
1
41 ~-~_.:.: ~ ---------l~~ ~ -~--------+-+-+-+-7 ( ~ 6 ~ ~) ~-----~ ~ ~
'-~ ~!2~R --------~~ (O=- ~ Y ~ ) --f--------+-+~- - ~+--- - ~~-- ~
4
(~0~-~Yt) ~~ 6- ~ Y ~ E~L - L ~ ~ :t
65
~
17 ,. • (R-BL) ~
G-BK
12T (Y-0) Y-0 4 ~
42 ~~ ~ ~------~~ ~ ~-1--------t-1-1---J.~~~----~~ l )+----4' IC2
~ 2 ~
12L (Y~) (Y~) ------+?
1
4l f-~ ~=- ------~~ ~~ -~--------t-1-1--t~~ 6K ~------~ ~ G ~
1_ (S-6K) C-VIOLET
6
~
'<J 1R - 6Rl 5 ~
(G-R) 4 ~
(R)
(6K)
(6K - S) l )+----4'
6 ------+? 2 ~ !Cl
(6K 6R) ----+7
1
)+----4'
6K- ~G ~
BR (G-6K)
COM KEY [ 1l f--J_:_:.::._ ______ --jf-'-:...C...:....-f- *
2i52iiN"LY l6 ~-...J- l:..:l _:. T ________ + -"(B::K :... ~"-') '--1-- *
(SEE NOTE) ,9 Ill (BK-6R)
~ ~
NOTE:
IF THE lRD INTERCOM
PATH IS PROVIDED
4
~
(2152~
l
COIMJN I CAT I ON SYSTEM
2
~
ONLY) TERM\ NATE,
1
(G -6K) AND (6K-G)
LG
(6l-Y)
L )+-
LEADS TO TER MI NA LS 5
112
IBK
LG )-'-
A ND 6, R ESPECTIVE L Y.
(G-Y)
~ ~
T ERM I NATE LEADS ONLY
LG
WHE N INTERCOM PATH
LG S-Y
~ ~
IS PRO\IIDED.
~ ~
*- I NSULATEO AND STORED
L )+-
LG )-'-
(6R)
2 0J---------------------+----~~-----
Fig. 6-853AM Telephone Set Connections (Sheet 1 of 2)
Page 6

ISS 1, SECTION 503-603-130
422BAC NE K
BRA DIAL
F (BL)
(B L- V) " (
BL ) + DIAL
PU L SE
V-BL
(V - 0)
GN
(W )
nu
r\
B
(W)
.........
(B L)
~
'~
1:
(~
O FF
A B
NOR M AL
:::L-
y~
~
...
c
(R)
m
(BK) R
(W)
~
L2
(BK)
(R) f-------7
I~
TRMTR a f-------7 (BK)
~
f-------7
(W)
RCVR
) f-------7 (G)
H4DU - 50
G15A-50 HANDSET
CORD
616T JACK
(Y)
GRD
" 1 (G)
~
1\ I
POT
ASSEMBLY
AMP r
~
~
4
INPUT I/
1\ f
3..
(G)
kf, :;r; 40'
1
BARE
SPEAKER
S'RAP
r:
(G) :r
(BK)
(BL)
;,.
(0)
BK
(BR)
AMPLIFIER PWB ASSY.
Fig . 6-853AM Telephone Set, Connections (Sheet 2 of 2)
Page 7

SECTION 503-603-130
CONNECTOR
LEAD
DESIGNATION
WIRING
HARNESS
(V~)
TERMINAL
80AAO
COM KEY 25 Ml C RETURN S -V -;,;: 3
635A5 KEY LINE SWITCH
0
HFAI [
48
DO NOT DISTUR8 ,.,.
1
2152 ONLY 50 MI C RETURN V-S ~
4
21
6
~=fjV~O~IC~E~IN~---l~(~8~L-~V+)-t------=--------~---------------------------l--------~(~8~L-~V~)---
£~~~A~W~G;,~~C:I--ir~V~~~LL_t---------------~-----------------=========~=========~V~~~Lr===
7
~£==~A~W~-~ 2 ~4V~C====~~ViO~=t====~~~~~It===========================~~~==~:J~~===
4 " -:>AV (R~-V 'V 10 "" 7 S (V-0
4 f--i~A=1~~~--~~~(Y~-8~R~)-t----~""~1~1~----l---------------------------!-~(YQ) __ ~~:
3 f--1~ S~T~A~8~U~ SY ~---l~~ (G~ ~~ ) ~t-----~~~~87:~--~--------------------------~~(8~Rl)~
13·~~
14
,-t-------------------------~~(G~)~~d~:~o~(~WL) __ ___
0
0
0
0
(R) (8L) d' o' (8L)
COM KEY
718 OR 2152
(G)
9
""'
(V-8 R)
~ 6
~ 5
(G-W) ~
4
(8K -8L ) ~ c----tJ
(V~ R ) ~l~
8K L )4-
LG )-'--
5 ~-i~I1~R~-------t~ (S~~~K) ~--------+-i-i--l-¥. (S~-~8K~) --~ A-~8~LA~C~K ~
' t-+-+-7 (o;.R)'-;;.,.. -------;4 : ~
G-Y) }+-------4'
(G - R)
O ~-4_! 11!_.:!T:_ ______ +_j! (8~K;:_-S~) ~--------+--++=t=fi <
8
~K~-SU::: =====:~ 4 ~
l )+-------4' IC1
~ 2 >+------...
1
f-~~~1~L ________
11
~ <Y~-~8L~> -t ________ i=i=i==t~< Y ~- 8[L = ) ======1i 1 ~
8K ~G~
7f--t~l2~R ________ ~~ (O~-~Y) L_f--------+-+-+--~~ (O ~- Y~) ~! 8~-Y~E~LL~~ ~
tR-8L) : ~
t--f ~l2~T --------~~( Y~-O~) ~t----- -- -+-+-+==~ ~G~- 8~K== ====~
2 Y-0 : ~ IC2
~ 2 ~
l f--t~ l~2~L ________
11
~(Y~~~)-- t--------t=t=t==~ (~Y?~c) ======~ 1 )-+-------'f'
(8K) ~G ~
I;_ (S-8K) C-V I OLE T
5
6 ~
R-8R
C OM KEY 13 ~--i-'-"'----------l- .:.::::= --t- * r>. 8K -S ' )-+-------'f'
[
HR (G-8K) '---t--+.:::'7:----H! ~
2152 ONLY lBf- -f- l!.e3~T ________ +_ i!(18~K-::!G!l.._l l---* ~ ~
2
~ I Cl
(SEE NOTE) '" f---t -l:.:.3.:.L ________ + _(~8:::_K-::8:::_R!_) f------ --+------I-- (~
8
~K-r!!
8
!!J.R)L ____ .;4 1 )-+-------'f'
8K) ~G ~
(Rl
(G)
COM KEY ~~~:t~L~G~======~~¥.GE-~y~t:~~1~2j! [8~KK) ~
[
~ m~~
718 OR 2152 20 ~--f- L
00
G :.._ ______ ---JI---l: (S~-Y ~ ) ~-I--Jy
Fig. 7-2853AM Telephone Set, Connections (Sheet 1 of 2)
Page 8
(8K)
(R)
NOTE'
IF THE lRO INTERCOM
PATH IS PROVIDED
(2152 COM KEY
COI'HJNICATION SYSTEM
ONLY) TERM I NATE
(G -8K ) A~ (8K-G)
LEADS TO TERMINALS 5
A~ 6, RESPECT I VELY.
TERM INAT E LEADS ONL Y
WHEN INTERCOM PATH
IS PROVIDED.
* - I NSULATEO A~ STORED
(8R)

(BL-V)
(V-Bl)
V-D
(W)
(BL)
(BK)
(R)
G
rl
(BR)
•
ISS 1, SECTION 503-603-130
4228AO NETYOOK
l5YlA DIAL
F (G)
(W-BL) A l
f.
...
.... 1
GN
n.
(W)
~rU
~
~
4n
B (BL)
~
(BK)
~
~ A
4 (BK)
~
:::~
RR
r---
K
...
(0-BK)
~
c k
u
~~
R (R-G)
;: __
" T
s (R) y
J•
~~
w
~
L2
' :::,
0
-{~
...
L1
(G) f--------7
I~
~
RCVR ~
+
(W)
~
f--------7
~
f--------7 (BK)
TRMTR
~
) (R)
~
~
~
H40U-50
~
G1 5A - 50 HAtllSET
CORD
61 6T JACK
(Y) (BK)
GRO
, (G) -
~
c;
POT
~cr
ASSEMBLY
~ dR
j 2
(G) ~
~ ;:
L{Q
BARE
SPEAKER
STRAP
r- : ;:r-
(G) I
(BK)
;p
(BL) '
(0)
I (BK)
I
AMPLIFIER PWB r,SSY.
Fig. 7-2853AM Telephone Set, Connections (Sheet 2 of 2)
Page 9
9
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