AT&T Plant Series Service manual

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BELL SYSTEM PRACT I CES
Plant Series
REFERENCE
1220A H~ND T ELEPHONE SET
ACl AND ADl TELEPHONE BASES
1. GENERAL
1.01 This section provides identification, installation,
maintenance, and connection information for
the 1220A hand telephone set, and the associated
ACl and ADl telephone bases. This information
was previously contained in Sections 502-320-100,
502-321-100,
and 502-321-400 which are hereby
canceled.
2. IDENTIFICATION
2. 01 The 1220A hand telephone set (Fig. 1) is a
compon
ent of the dial-in-handsetTRIMLINE@
telephone
set . The hand telephone set is a complete
telephone
set except for the handset cord, ringer,
and line switch which are housed
in either a ADl
(Fig. 2) or ACl telephone base.
2.02 The ACl telephone base is used for wall
mounted installations while the
ADl base is
used for desk-type installations.
8082A
DIAL
SE C TI ON 502-304-101
Is
su e 1, Ap ril 1970
AT
&TC o Sta ndard
Fig. 1- 1220A Hand Telephone Set
Ordering Guide
2.03 A complete telephone set consists of a hand
telephone set,base, handset cord, and mounting
cord, all of which
must be ordered separately.
eSet, Telephone, Hand, 1220A-*
eBase, Telephone, ACl-*
eBase, Telephone, ADl-*
eCord, Handset, H4DB-*
eCord, Mounting, D5AL-* 5 feet-6 inches, 9,
13, and 25 feet (ADl base)
eCord, Mounting, D5AN-* 5 feet-6 inches, 9
and
13 feet-Retractable (ADl base)
Fig. 2- ADl T elephone Base W ith 1 220A Hand
Telephone Set
© American Telephone and Telegraph Company, 1970
Printed
in U.S.A. Page 1
TCI Library: www.telephonecollectors.info

SECTION 502-304-101
2.04
Optional Components ( order separately ):
eCord, Handset, H5AA-* 5 feet-6 inches, 9
and 13 feet (Required when providing tip
identifying ground)
eCord, Handset , H5AD-* 5 feet-6 inches only
(Equipped with Message Waiting Lamp}
eP-90D231 Polarity Guard Assembly
2.05 Associated A ppara tus or Equipment:
e 2012A Transformer (for other suitable
trans formers, see section on transformers)
2.06 Replaceable Common Components:
eLamp, 53B (replacement for all hand telephone
sets)
eLamp, 5 1B (current production hand telephone
sets)
eP-82E8-* Cover
eP-25E803 Number Card Retainer
eP-28E320 Light Seal
eForm, E-5002A (number card)
eRinger,
PlA
eCard ,F ace,Dial (see Table A)
* Refer to Table A for color suffix.
2.07 A customer instruction booklet (GN-2433) is
sh ipped lose with the hand telephone set
and should be left with the customer.
Design Features
2.08 The 1220A hand telephone set provides the
following features:
elllu minates 10-button TOUCH-TONE@ dial.
Note: Early production handsets will have
the lamp in a vertical position, current
production handsets have the lamp in horizontal
position.
Page 2
TABLE A
COLOR SELECTION AND PIECE PART INFORMATION
HAND TELEPHONE DIAL FACE CARD
STANDARD SUFFIX COLOR PIECE
COLOR* PART
NO .
Black -03
Slate P-22F570
Ivory
-50
Cinnamon P-22F571
Brown
Green
-51 Dark
P-22F572
Jade Gray
Red -53
Burgundy
P-22F573
Yellow
-56
Gold
P-22F574
White
-58
Slate
P-22F570
Rose Pink
-59
Rose
P-22F575
Lt. Beige
-60 Sandalwood
P-22F576
Lt. Gray
-61 Slate
P-22F570
Aqua Blue
-62
Pea coc k Blue
P-22F577
Turquoise -
64
Turquoise Green P-22F578
*Refer to Section 500-120-100 for promoted colors.
eEquipped with recall switch.
eP-82E800 type cover or number card and
associated retainer can be used to conceal
housing
screws and lamp.
Note: 1220-type hand telephone sets may
be found in the field with a number card or
cover used to conceal the screws in the
handset. Current production sets will have
the number card in the base since this is a
more convenient location for the customer.
eEquipped with jack (Fig.
3) to accommodate
a plug ended
handset cord (Fig. 4).
2.09 ACl and ADl telephone base provides the
following features:
e Factory-wired for individual or bridged
service.
eAdjustable
ringer volume control.
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PIA
RINGER
FORM
NO .
ISS 1, SECTION 502-304-101
SCREWS
P-25E803
NUMBER CARD
RETAINER
Fig. 3-lnterior of ADl Telephone Base (Current Production)
HAND TELEPHONE
SET PLUG
(T APERED GROMMET)
Fig. 4-H4DB Cord
e ACl base (for vertical mounting)-jack
equipped to receive plug-ended handset cord.
e ADl base (for horizontal mounting)-jack
equipped to receive plug-ended handset and
mounting cords.
e A lead control (optional).
e4-party full selective or 8-party semiselective
ringing by adding 426N diode (optional).
eSpace provided on bases for number card
and associated number card retainer.
e The cover of the ACl telephone base permits
hanging the hand telephone
set along either
side of
the base by hooking the receiver
end
on the top edge of the cover. This
feature permits hanging up the handset
without going to on -hook position.
Page 3
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SEC TI ON 502-304 -1 01
2.09 The hand telephone set with base can be
used
on CO or PBX lines and can be modified
for use with lA, 1A2, or ()A k ey telephone s.vstems.
3. INSTALLATION
3.01 When planning the installation of a hand
telephone
set together with its companion
base, consider the following:
eSafety for yourself, customer, and maintenance
personnel
e
Location-desk, table, wall, etc.
eAvailability ofpower outletfor hand telephone
set dial light transformer
eSpace requirement
eGeneral appearance of installation
3.02 The plastic housings of the ACl and ADI
bases are secured by captive housing screws
located behind the number card and number card
retainer.
To remove the housing from either base
assembly,use a KS-16750 type releaser or equivalent
to remove the number card retainer (Fig.
5). Be
c areful no t to damage the hou si ng . Loosen
the two captive screws, which are now exposed,
and lift the housing off.
./A CI
/"' TELEPHONE
BASE
Fi g. 5-Remov i ng Number Card Retainer
Page 4
3.03 The ACl base may be mounted directly to
a firm vertical surface.
If necessary, use a
155-type adapter or 182-type backboard. Refer to
appropriate section
in Division 463 for additional
information on adapters and backboards.
3.04 When inside wire to the ACl (wall) telephone
base is exposed, terminate the line and
transformer wiring at a common bridging point,
such
as a 42A connecting block. Run one quad
station wire from the connecting block to the
telephone base. Wiring may enter from the opening
at the bottom, top, or through the backplate.
3.05 In cases where an inside wire is already in
place through a wall, an exposed wire run
may be necessary between the dial light transformer
and the base.
t<
E
Polarit y Guard should only be install ed
when instructed by lo c al administrat iv e
practices or procedures for end-to-end
signaling purposes when batter y and
ground re v ersals ar e enc ountered
(Fig. 6).
Fi g. 6-P-900231 Polarity Guard Assembly, Installed
3.06
To replace the housing on the ACl base lift
and hold the line switch plunger while housing
is placed on the backplate. Release plunger so it
will rest properly on the line switch arm of the
base assembly. Tighten the captive housing screws
and replace the number card.
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3.07 Insert the plug end of the D5AL or D5AN
mounting cord (Fig.
7) into the jack located
on
the underside of the base assembly. Make
sure that the spring clip of the plug snaps into
place to secure the plug. Lay the cord in the
cord channel and slide the cord retainer over the
cord.
Fig. 7-DSAL Mounting Cord
3.08 Connect the 1220A hand telephone set to a
telephone base by plugging an H5AB or
H5AA (tip
party identifying ground) cord in the
jacks on each component.
3.09 If tip party identification is required, an
H5AA cord must be u se d. Check under
P-82E800 cover to see that screw used in tip party
identification sw itch is tightened down. The absence
of a screw or screw hole
in the identification switch
position
indicates that the connection has been
made in the network at the factory.
3.1O If message waiting lamp feature is required,
an H5AD cord
must be used (Fig. 8) . The
lamp equipped end
of the cord plugs into the hand
telephone set.
~ When using these push-in-lock type
~ plugs make sure the contacts are in
proper position to make electrical
connection with the mating contacts,
and that the plug is placed in the
proper receptacle. Either error will
cause circuitry problems and extreme
difficulty in removing the plug.
ISS 1, SECTION 502-304-101
..........._H5AD HANDSET CORD
Fig. 8-HSAD Handset Cord (Message Waiting Lamp)
3.11 Where a single dial light is involved, use a
2012A transfor mer . Select a 105-120 volt
ac rece
pt acle not controlled by a switch. If the
transformer does not have
the folded-blade prongs
use a
2A clamp to secure transformer to the outlet.
Where two
or more dial light sets are in sta lled,
refer to the section on station transformers for use
with multiple installations.
The illuminatio n of the dial diminishes
with increased cord lengths. In
insta llations where the illumination
is considered inadequate , the 53B
lamp may be replaced by a 53A, if
the lamp power is supplied by a 2012A
transformer and the combined lengths
of mounting and handset cords exceed
15 feet. Refer to Part 5, Maintenance,
for dial lamp replacement.
3.12 For proper illumination of the dial the length
of wire between the transformer and telephone
set should not exceed 250 feet of inside wire.
3.13 When the hand telep hon e set is used in
conjunction with a k
ey telephone system ,
the dial lamp can be
powered from the 10 volt
tap of a lOlG or equiva lent power supply of the
key system . If a 10 volt power supply is used
replace 51B or 53 lamps with 51A or 53A lamps.
3.14 Ringing and/ or identification ground, where
required, is common to the lamp circuit.
Page S
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SECTION 502-304-101
Damage to the transformer may result if there is
sufficient ground potential difference between
power and telephone grounds. Refer to appropriate
section on bonding to power
grounds in Division
460.
3.15 A 426N diode must be installed in either
the ACl or ADl base assembly wJien
connecting for 4-party full selective or 8-party
semise lective ringing. The two leads from the
diode are designated No. 1 and No. 2. Lead No. 1
extends from the flanged (gold) base of the diode;
lead No. 2 extends from the housing tip of the
diode. Place the diode in the opening provided in
the terminal board (Fig. 9). Dress the leads to
the appropriate terminal board terminals, refer to
Table E for connections.
LEAD
N0 . 1- "'ii"-----4!11! !!!l~._.,... ,
426N
DIODE
Fig. 9-426N Diode Installed
3.16 Where extreme noise induction conditions
exist, the 426N diode will not be used.
Instead, a cold-cathode tube or a ringer isolator
installed on a 74A connecting block may be used.
See section on inductive noise for connection
information.
3 .1 7 For portable installations of the ADl telephone
base, terminate the line and transformer
Page 6
wiring to 550A jacks or equivalent. Connect the
spade-tipped leads of the D5AL or D5AN mounting
cord to a 505A plug. Connect other end
of mounting
cord to
ADl base in normal manner.
3.18 For portable installations when only one
portable telephone set is equipped with a
dial light, one 2012A
transformer may be connected
to
two or more jacks. When more than one
portable telephone set with dial light is installed,
ref
er to section on station transformers for selection
of proper power source.
On 2-party tip stations requiring ground
identification, be sure that the jacks
and plugs are instaJJed in accordance
with the section on jacks and plugs.
4. OPERATION
4.01 Instruct the customer on the necessary
operating features.
4.02 RecaJJ Switch (Fig. 1): Point out recall
switch and explain advantages of switch.
Example: If a person receives busy tone at
conclusion of dialing a number , he may depress
the recall switch for a few seconds; then release.
Dial
tone will again be heard . This is done in
place
of depressing line switch plunger on the
telephone base.
Caution:
If the recaJJ switch is depressed
during conversation or dialing, central
office equipment ma y be disconnected.
4.03 Demonstrate the three-step ringer volume
control. Caution the customer
about ringer
cutoff if the screw is removed to provide this
feature.
5. MAINTENANCE
5.01 Maintenance of the ACl and ADl telephone
bases is limited to
ringer bias adjustment ,
burnishing or adjusting contacts, and replacement
of defective components.
5.02 For adjustments and ringer cutoff feature
of the PlA ringer, refer to the appropriate
ringer section in Division 501.
5.03 In areas where RF suppression is required,
replace
the hand telephone set with a set
t hat has been modified by the local distributing
Q
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house. Modified sets will not be recoded but will
be stamped "RF Suppressed See Section 500-150-100'~
Stamp is located adjacent to handset cord jack
where the set code is stamped.
5.04 Field maintenance of the 1220A hand telephone
set is limited to the following:
eDial lamp
eP-25E803 number card retainer
eP-28E320 light seal
eF orm E-5002A number card
e H andset Cords
eP-82E800 Cover
5.05 To replace a dial lamp in the TRIMLINE
hand telephone set, remove cover or number
card retainer and light-seal plate. Current production
hand telephone sets have the lamp
in a horizontal
position and a KS-6320
orange stick can be used
to remove the lamp (Fig.
10) . EXEllCISE CAUTION
TO PREVENT THE LAMP FROM FLYING
OUT OF THE SOCKET IN A DANGEROUS
MANNER. In early production hand telephone
sets use a 553A tool to remove the lamp from its
vertical position (Fig.
11).
Note: Lamps carried for maintenance reasons
should be of the 53B type since both early
and
current production handsets accommodate
this type.
5.06 To replace a plug ended handset cord (Fig. 12)
or mounting cord (Fig. 13) use a KS-16750
type releaser. Insert tool in space provided and
apply pressure against spring
clip toward body of
plug . When spring clip has been depressed pull
plug
out of jack.
ft
If transmission troubles are experienced
or the dial is inoperative, replace the
hand telephone set.
ISS 1, SECTION 502-304-101
Fig. 10--Removing Dial Lamp From Current Production
1220A Hand Telephone Set
5.07 To test hand telephone set procede as
follows:
(a) Make sure all connections are correct and
secure, and line polarity for TOUCH-TONE
dial is correct.
(b) Listen to set receiver for presence of dial
tone.
(1) If dial tone is heard, dial any digit or
digits prescribed by local instructions to
break dial tone.
If dial tone can be broken,
depress and release recall button.
After second
dial tone
is obtained, call the local ringer test
circuit for TOUCH-TONE dials and test each
button of the dial as required by local test
procedures. If dial fails test, replace complete
hand telephone set.
(2) If dial tone is not heard, in set receiver,
connect dial hand
test set at connecting
Page 7
TCI Library: www.telephonecollectors.info

SECTION 502-304-101
Fig. 11-Replacing Dial Lamp in Early Production
1220-Type Hand Telephone Set
Page 8
block. If dial tone is heard with test s et, Q
remove the handset cord at the hand telephone
set and move the te . st set leads to the (G)
and (R) conductors at the cord plug . If dial
tone is not heard , replace the hand telephone 0
handset cord and telephone set base .
6. CONNECTIONS
6.01 Refer to Table F for connections if a polarity
guard is provided.
6.02 Dial restriction of a TOUCH-TONE dial
equipped telephone set is controlled by the
polarity applied to the dial. Reverse tip and ring
to restrict dial, and leave the dial in the handset.
Check that ringer connections have not been affected
by line reversal.
Note: Dial restriction cannot be provided on
a TOUCH-TO E telephone set where local
instructions specify using a polarity guard.
6.03 Fig . 16 and Table B provides wiring changes
and connections required for us ing the
TRIMLI E telephone set with lAl , 1A2, or 6A key
telephone systems.
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A
c
I .
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WITH SHOULDER
AGAINST HOUSING
APPLY PRESSU RE
TOWARD PLUG
ISS 1, SECTION 502-304-101
Fig. 12-Removing Cord From TRIMLINE Hand Telephone Set
Fig . 13-Removing Mounting Cord From ADl Telephone
Base
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ACI TEL EP H ONE BASE
1220A HAN D TELEPHONE SET
LINE SW IT CH :,:,:::;':
2J If
H4DB,HSAA
OR HSAD
HANDSET
CO RD
JACK
RE C ALL
SWITCH
861 A NET WO RK
~)[1J!i1
( dL)
(0) ]]
(G)
TIP
(G)
~LI
lo I
RING
1 ~ I Ci'JL 2
PIA RINGER
(N OTE S)
( BK)
soon
1 (B
L)
(N O TE 3)
J
~
(BK )
soon
b
(Y)
(S) *
Gl
I
1650n
r: a
(S-R)
R)
*
S TRAP
f
(R ) T
K
-0c
NOTES:
HAND SET CO RD
(Y) [W) I
2
( • • -· ) 4 ) I I ~-,-
MESSAGE
WAITING
L AMP
(N O TE 4)
• [Y)
, 5 (
~ 5
(Y)
IR l
• , 3 (R) [R) 3
~::~::?~
::;::::::~
I. S TATI ON GROUND MAY BE O MITTED IF NOT REQUIRED F OR SE RVI CE; N OT REQUIRED FOR PROTECTI ON OF
(-)
o1 AL L1 GHT TRANSFORMER. nm T6Ts
2. LIN E S WI TCH O FF-HO OK SE QUEN CE
be CL OS ES
de CL OS ES
ob O PEN S
jk CL OSES
3. DI SCO NNE CT (BL) LE AD FR OMB TERMINAL WH EN HSAA CORD IS USED AND TIP I DENT IFYING
GROUND IS NOT PR OV I OED , IN SU LATE OR STORE ON llNUSED TERMINAL
4. LAMP AN D R ES I STOR ARE PART OF HSAD CO RD O NL Y, ( ME SS AGE WAITING FEATU R E).
(Y) LEAD IS NOT TE RMINATED IN SET PLUG. S EE TABLE G FOR CO NNE CTIO N ATACI TELEPHO NE BASE.
5. SE T WIRE D F OR IN D IVIDUAL OR BR I DGED SE RVI CE , FOR ALL OTHER PARTY SE RVI CE
REFER TO RINGER CO NNE C TI ON TABLE.
( ) CO L OR CODE H4D B CO RD
[ ) COLO R CODE HSAA OR HSAD CO RD
* INSU LAT ED AN D STO RED
80B2 A D IAL
DI AL
LIGHT
Fig. 14-1220A Hand Telephone Set and ACl Telephone Base, Wiring Diagram
0 c) .0 0 0
RC VR
(W)
0
(+I
0
Vt
m
n
-4
0
z
UI
0
l>.J
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.jlo
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-
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TCI Library: www.telephonecollectors.info

-a
a
ID
CD
~
("--'
r
~ (
'--
()
INSIDE
WIRE
CONN
BLK
D5AL
OR
~DI TELEPHONE BA SE
H4DB,H5AA
1220A HAND TELEPHONE SET
GRD
(NOTE
I)
r-~~~~~~~~~~~~~ ~ ~~~~-- OR H5AD
~
:·:::::::
(G) [G)
MESSAGE
WAITING
LAMP
(N OTE 4)
[Y] s > I •
:: , 111 , ~
----"""'"--~ 1@ ;; ; ::;: ::' ; ::: ,I,
b (Y)
t(B: ) ! (S~ (R)
NO TE S: . 0 ( 3.
( R) [R]
I. STAT I ON GRClJND MAY BE OMITTED If NOT REQUIRED
F OR SERVICE; NOT REQUIRED FOR PROTECTION Of
D IAL LIGHT TRANSFORMER.
2. LI NE S WIT CH OFT-HOOK SEQUENCE:
be CL OSES
de CLOSES
ob OPENS
jk CLOSES
3. DISCO NN EC T ( BL) LEAD FROM B TErtMINAL WHEN H5AA
CORD IS U SEO AND TI P I DE NTI FY I NG GROUND IS NOT
PROVIDED, INSULATE OR STORE ON UNUSED
TERMINAL.
4. LAMP AND RE S ISTOR ARE PART Of H5AD CORD O NLY,
( ME SSAGE WAITIN G FEATURE) . [v] LEAD IS NOT
TER MINATED IN SET PLUG . S EE TABLE H FOR
CO NNECTI ONS AT ADI TELEPHONE BASE.
5. S ET WIRED FOR INDIVIDUAL OR BRIDGE D
SE RVI CE , FOR ALL O TH ER PARTY SERVI CE REFER
TO RINGEk CON N ECT I ON TABLE.
6. CHA NGE TO 53A LAMP If CO MBINED LENGTH Of
HAND TELEPHONE SET CO RD AND (AD I BASE)
MOUNT ING CORD EXCEEDS 15 FEE T.
( )
CO L OR CODE H4DB CO RD
[ ] COLOR CODE H5AA OR H5A D CORD .
* INS ULATE AND STO RED .
Fig . 15-1220A Hand Telephone Set and ADl Telephone Base, Wiring Diagram
7
(W)
(-)
D l
"'
"'
"'
m
n
-t
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"'
0
...,
I
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TCI Library: www.telephonecollectors.info

SECTION 502-304-101
IR E
INSIDE W
OR
IW CAB
(NO TE
LE
I)
I 044 CONN
BLK OR
EQUIVALENT
MTG J
AC
K IW
CORD
(NOTE I)
A l ---
,...
-
----
TO DIAL
LIGHT
TR NSF
T IP
A
RI NG
NOTES :
i
l (
W)
'CJ
~
(BK)
-
,.....
(G)
'U
s
(Y)
,.....
~
~
(R)
'CJ
'
,
'
/ 2 ' /
'
, ,
4
'/ '
,
s
'
, ',
3
I. RUN INSIDE WIRE DIRECTLY TO TER M INAL BOARD WHEN AC I BASE
IS USED AND TO CONNECTING BLOCK WHEN ADI BASE IS USED.
2. DISCONNECT (BL) LEAD FROM TERMINAL B WHEN HSAA
CORD IS USED, INSULATE OR STORE ON UNUSED TERMINAL .
P IA LI NE
RINGER SWITCH
(NO TE 3)
..__ ---- -
-----i
--
(BL)
• (
d (
G)
et
( W)
(
R)
(S-R)
*
16S00 I
(S)
*
soon 1
I
(BL)
soon
(BR)
ci b
(Y)
aj
(S)
(NOTE 2)
(BK)
3 . LINE SWITCH OFF-HOOK SEQUENCE
b-c CLOSES
d-e CLOSES
o-b OPENS
j-k CLOSES
* INSULATED AND STORED
TERMINAL
BOARD
(NOTE I)
~
),. 3
-
,.-,,I
~
"-'
~F
"-'
LI
,
"
(BK)
~~A
::::~
" K
G
~
I
~
'CJ
L2
B
,.....
~
c
,.....
Fig. 16-ACl and ADl Telephone Bases, Connecti ons for lAl, 1A2, and 6A Key Telephone Systems
Page 12
HAND
SET
CORD
JACK
0
(W)
0
(BK)
/
'
( G)
0
0
( Y)
,
'
( R)
' 0
0
0
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u
TABLE B
CONVERSION FOR USE WITH 1A1,
1A2 , AND 6A KTS
TERMINAL BOARD
LEAD COLOR FROM
TO
BR c G
Line
s A L2
Switch
y L2 3
I A
Cl BK
Ll c
Ringer
ADl BK G c I
Mtg Cord
R L2 i c
or IW
Capacitor
BK
I A
Ll
Strap
TABLE C
ACl (WALL} TELEPHONE BASE CONNECTIONS FOR
2-PARTY SERVICE
TIP PARTY
1-- ----- --- --- -
WIRE OR
RING
NO
WITH
COLOR PARTY IDENT
LEAD
IDENT GROUND
GROUND (NOTE 1)
Ring
R L2
Ll Ll
~ --- ··------ I---- ·
...
.._ _____
Inside
Tip G Ll L2 L2
----··-
--·-- -
~- -·- ··---··-
-- .
Wire
GRD y 3 3 3
-·---- · ---- - --
TRNSF
BK
1 1 1
'
R K K K
Ringer
-- ·-
. ..
·- -- -·-
Leads
BK
3 3 3
-- -·-
(Note
2)
·-
--
BL
B B B
Handset
Co rd R c F F
Jack
,___
--
I--- ----·
G F c c
Notes:
1. Same connections used for either 1000 or 2650 ohm
Central Offices. For tip party identifying ground -
lOOOn or 2650!1 H5AA cord must be used.
2. To permanently silence ringer; move ( R) ringer lead
from K to G on terminal board. For tip party identi-
fication (BK) ringer le ad must remain on G of
terminal board.
* Disconnect (BL) lead from terminal B wh en H5AA cord
is used and tip identifying ground is not provided, in-
sulate or store on unused terminal.
ISS 1, SECTION 502-304-101
TABLE D
ADl (DESK} TELEPHONE BASE CONNECTIONS FOR
2-PARTY SERVICE
TIP PARTY
WIRE OR RING
NO
WITH
COLOR PARTY IDENT
LEAD IDENT
GROUND
GROUND
(NOTE 1)
Ring
R R R R
Inside
Tip
G G G G
Wire at
GRD y y y y
Conn
---· ·- ----
Block R y y y
TRNSF
f---. --
·- I- - -- -····
G B B B
R R G G
>--- · -·
Mtg
G G R R
Cord
------
- --- ---··
at
y y y y
Conn --
·- - -
..
Block
BK B B B
·-
w y y y
R L2 L2 L2
--
Mtg
G
Ll
Ll Ll
Cord
f---
-- ----
~--
...
in
y G G G
Tel
- ~ - -- ·
Base
BK 1 1 1
~-- --·
---
~ - -
--
w 3 3 3
R K K K
Ringer
Leads
BK
G G G
(Note 2)
---·
---
BL B B B
Handset
Co rd R c F F
Jack G F c c
Notes:
1. Same c onnections used for either 1000 or 2650 ohm
Central Offices. For tip party identifying ground -
1000
!1 or 2650fl H 5AA cord must be used.
2. To permanently silence ringer ; move (R) ringer
lead from K to G on terminal board. For tip par ty
identification (BK) ringer lead must remain on 3 of
terminal board.
* Disconnect (BL) lead from te rminal B when H5AA cord
is used and tip identifying ground is not provided ,
insulate or store on unu sed terminal.
Page 13
TCI Library: www.telephonecollectors.info

SECTION 502-304-101
TABLE E
CONNECTIONS FOR 4-PARTY FULL SELECTIVE OR 8-PARTY SEMISELECTIVE RINGING USING 426N DIODE
Page 14
PARTY
L EADS OR
- RI NG - TIP
+RING + TIP
COLOR
R ing
R R R R R
Line
Wire
·· - ·-·
Conn at
Tip
G G G G G
Conn Block
·· -· --
..
GRD y y y y y
Dial
Light
I y y y y
.... . ··-
--
---- ---- - -- - --- -··
--- -----
-.
Transformer
Leads 2 B B B B
R R R R R
·- ---- -··
-- -- ---·- ·-- -
---- --- --·-
···- - ·---
G G G G G
Mtg
Cord
at
y y y y y
Conn Block
--
..
-- - ·
-- L-- ___ ___ _ ..:..__ __ _ _
~ -----·--
1-- .------ - ---
w y y y y
·- -- ---- - ---- - --
------ -- -·-
-- --- - ·---
BK
B B B B
R L2 L2
L2 L2
-· -- ··-- ·· ---- ·
G
LI LI LI LI
Mtg
Cord
-------···· --- -- -·-· - -- -
--- ·-· -- · . ---------
--- --- -
or
Inside v\Tire
y 3 3 3 3
at Term. Board
·· -- · ·-
-· - -·--
--· --- - ----
---- -·-·
··---·-··-
..
w 3 3 3 3
·· -- · ... ··- ·- - ---- -··- ---· -. -
------ -- ---
BK I I I I
CD
L2 LI
3 3
426N
Diode*
··-
·------
L_ ______ __ _ _
® G G G G
BK
K K K K
- -------
.___ -- -- ----
-·
- -- - --- --
L_ ____ -- -- ---- -
R 3 3 L2
LI
Ringer
·- - --- ---
Leads s t t t t
---- ---
--·- --- --- - - --
--- ---
S-R G G G G
·--- -- -- ---
.._ ____ __ _ __
-·
BL B B B B
Strap
From
A BK
3 3 L2
LI
Line Switch s t t t t
* CD Flanged (Gold)· base installed in enlarged part of opening, see Fig. 9.
@ Knob end (housing tip) .
.
, Insulate and store.
0
0
0
0
0
0
0
TCI Library: www.telephonecollectors.info

(
c
TABLE F
P-90D231 POLAR I TY GUARD ASSEMBLY
CONNECTIONS ( ACl OR ADl TELEPHONE BASE )
! I
IREMOVE CONNECT TO
FROM
WIRE
OR LEAD COLOR ITERMINAL POLARITY I
TERMINAL:
GUARD BOARD I
I BOARD ASSEMBLY
I I
Handset R i c
Term. R I
I I
Cord Jack
I G I F
Term. T i
I
Polarity
! I i
I R c I
Guard
I I I
G F i
Assembly I
Note: For use when specified by local instruc-
tions
for end-to-end signaling installations.
ISS 1, SECTION 502-304-101
TABLE G TABLE H
MESSAGE
WAITING LAMP IN CORD CONNECTIONS
FOR 1220A
HAND TELEPHONE SET
MESSAGE WAITING LAMP IN CORD CONNECTIONS
FOR 1220A
HAND TELEPHONE SET
TO ACl TELEPHONE BASE
CORD I ACl T
ERM . BOARD
OR
LEAD REMOVE \ CONNECT
INSIDE WIRE FROM TO
I I
I
G ! I
Ll
Inside
I
Wire
R I L2
I
!
w ! I 3
Handset
BK
! 4
Cord R
Jack
1 c
Leads
G F
Ll
y B L2
' i
I CORD
I OR
S ET WIR I NG
Set
Wiring
I
Handset
Cord
Jack
Leads
TO ADl TELEPHONE BASE
I
AD I T ERM . BO AR D
LEAD REMOVE
FROM
G
R
w
!
BK
R
G F
I y B
! !
I
I
I
I
l
I
CONNECT
TO
Ll
L2
3
4
c
Ll
L2
Pa ge 15
15 P
ag es
TCI Library: www.telephonecollectors.info