Bell 461-630-105 Service Manual

BELLSYSTEM PRACTICES SECTION 461-630-105
Plant Series Issue 1, February 1967

AT&TCo Standard

PLUGS

FOR PORTABLE TELEPHONE SETS

IDENTIFICATION AND CONNECTIONS

1. GENERAL inclement weather in order to maintain good

telephone service.

1.01 This section contains plug information 2. IDENTIFICATION
formerly found in Section 461-630-100.

2.01 Table A lists plugs used with portable

1.02 For associated jacks see Section 461-630-100. telephone sets.

1.03 Some areas require at least one telephone 274A PLUG
set or ringer to be permanently connected

to the line. Check local instructions governing line 2.02 The 274A plug (Fig. 1)is a two piece,
ringers. 8-contact plug of molded plastic. It is

intended for use with braided fabric covered mounting

1.04 Portable telephone sets should be kept indoors cords and is equipped with two eyes to which the
when not in use. Inform the cust_)mer how braid is secured. It is available in color as shown

important it is to protect telephone sets from in Table A.

TABLE A

PLUGS

TYPE CONTACTS NO.

ill ill i i i

NO. OF COLOR FIG. ASSOCIATED JACKS

404B 493A (MD)

2838 2 548A 497A (MD)

* 6, 7 549A KS-16151, L1 (MD)

505A 4 550A

P-44E055 Mounting

423A _ 3 Block and Screw Assembly

274A 8 .50 (Ivory) 1

-49 (Lt Ol Gy) 391A

-54 (Brown) 392A

....

- 541A, 547A, B,

504A 12 * 4, 5 551A

KS-8420

KS-8419 3 Brass 8 KS-8421

* Available in the following c_ors to match the telephone set: -3 (Black), -51 (Green),

-56 (Yellow),-58 (White),-59 (Pink),-60 (Lt Beige),-61 (Lt Gray),-62 (Aqua
Blue), -64 (Turquoise).

t This plug is inside the 750 _elephone set and may be any color as it is made from

scrap plastic.

© AmericamTelephone and Telegraph Company, 1967

Printed in U.S.A.

SECTION 461-630-105

yY BK Y

SQUARE KNOT

RR

W

BB

Fig. 1---274A Plug

283B PLUG

2.03 The 283B plug (Fig. 2) is a two piece,
4-contact plug of molded plastic in colors to

match telephone set colors (see Table A). The
mounting cord is secured by either a wingband

inserted in a slot in the cover or an S hook secured
with a self-tapping screw packed with the plug.

423A PLUG

2.04 The 423A plug (Fig. 3) is a two piece,

4-contact molded plastic plug for use with _r :_;_

the 750-type panel telephone set. U-shaped
projections are molded in the base for securing

the mounting cord. Fig. 2--283B Plug

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ISS 1, SECTION 461-630-105

U-SHAPED PROJECTION

TO HOLD MOUNTING CORD

Fig. 3---423A Plug, Front View and Rear View Cover

Removed

504A PLUG Fig. 4--504A Plug

2.05 The 504A plug (Fig. 4) is made in three

pieces of molded plastic and is held together 1 through 12 and match numbering on 541A jack.

by one screw and a snap-fit in the neck. Plug Plug can be inserted in jack in only one position.
block contains contacts and socket type terminals.

A cord tip guide (Fig. 5) covers terminals. Guide 2.06 Slots are provided on plug block and shell

will fit in only one position. The contact numbers (Fig. 5) to hold a wingband or clipped stay
are molded on the guide. Contacts are numbered hook. The wingband or stay hook seated in the

P-14E253

CORD TIP P-14E8 I0

GUIDE SOCKET TYPE

CAP

ASSEMBLY

TERMINAL ASSEMBLY

SLOT FOR

Wl NG BAND

P-48DI58

SCREW

_BLOCK

Fig. 5--504A Plug Disassembled

Page 3

SECTION 461-630-105

slot prevents mounting cord from slipping out of KS-8419 PLUG
plug. Included with latest models of the plug is

a metal cord stay, designed to be used with cords 2.08 The KS-8419 plug (Fig. 8) is a 3-contact,
equipped with a stay hook. The wire stay hook brass plug intended for connecting telephone

is removed and discarded. The cord stay, inserted sets installed on boats, trains, or auto trailers to
in the vacated band hole, serves as a wingband, outdoor jacks of PBX or CO lines. This plug is

intended for use with KS-8420 or KS-8421 jacks.

505A PLUG

4. CONNECTIONS

2.07 The 505A plug (Fig. 6) is a 4-contact plug

similar to the 504A plug, but has in addition 4.01 Only one wire, cable conductor, or cord
a cord fastener (Fig. 7) which holds the cord in conductor shall be connected to a terminal
place while the spade tips are being connected. The of a plug. In some plugs, e.g. 505A, 2 socket type

cord fastener also anchors the mounting cord in connectors are found on the terminal pins. These

the assembled plug. extra connectors may be used for storing unused

cord conductors if the unused conductors are insulated

and stored at the telephone set end.

274A PLUG

4.02 Connections for 274A plug are as follows:

(1) Make connections as indicated by color

designations stamped adjacent to terminals.

(2) Connect cord spade tips as shown in Fig. 1.

(3) Tie mounting cord securely.

Fig. 6---50$A Plug (4) Place shell on base and tighten screws.

' _"i7_ _ CAP ASSEMBLY

_;:'_......_{,7_77_i__I. P-26E77"/' SOCKET TYPE

___ CORD

FASTENER

CORD TIP GUIDE

P-44E694 SCREW

BLOCK SLOT FOR W/ING BAND

OR CLIPPED STAYHOOK

/

Page 4

Fig. 7--505A Plug Disassembled

ISS 1, SECTION 461-630-105

GRD

TYRIEX SJ3 NO. 18 CORD

T R

Fig. 8--KS-8419 Plug

283B PLUG (4) Place cover so cord and wingband will

seat properly in their slots.

4.03 Connections for 283B plug (Fig. 2) are as
follows: (5) Seat base of plug in its cover before

tightening screws in order to prevent

(a) Using D3BP or D4BK cord: pinching of cord conductors°

(1) Make connections as indicated by color

designations stamped adjacent to terminals (b) Using D3BU or D4BP cord:

(Fig. 9).

(1) Remove P-18E457 adapter from cord

(2) Bend cord spade tips up as shown in (Fig. 10).

Fig. 9.

(2) Using long-nose pliers and 8-inch side

(3) Place one edge of wingband in the larger cutters or equivalent (Fig. 11), turn large

(shallow drilled) of the two holes in the eye of S hook clockwise until positioned 90

base. degrees away from small eye of S hook.

_ iii_

R Y WING BAND

G

i°'.........

_ SLOT FOR WING BAND

STAY
HOOK EARS

BEND CORD SPADE TIPS AS SHOWN

Fig. 9--Terminating D3BP and D4BK Cords on 283B Plug

Page 5

SECTION461-630..105

(3) With small eye of S hook up, insert (2) Insert mounting cord tips into socket type

RM-658901 self-tapping screw with P-284139 terminals of plug.

flat washer through large eye of S hook. Using
farthest hole opposite cord entrance (Fig. 12 Note: For mounting cord conductor connections,

and 13), anchor cord securely, refer to the proper section.

Note: An RM-658901 self-tapping screw and (3) Dress conductors so they will lie within the
a P-284139 flat washer will be shipped with cap of plug.

each 283B plug (Fig. 13).

(4) Place wingband or stay hook and mounting

(4) Lay the cord conductors out straight from cord in their proper slots.

the cord (Fig. 12). Pass the green conductor

clockwise under the cord stay and terminate (5) Place cap on plug so cord and wingband or
it on the GN punching. Pass the red conductor stay hook will seat properly. Be sure no
counterclockwise under the cord stay and leads are pinched.

terminate it on the R punching. Pass the
yellow conductor clockwise, under and then (6) Snap two sections of neck together.

over the top of the cord stay. Terminate on
the Y punching. If the black conductor is (7) Insert screw and tighten.

used, pass it counterclockwise under and then
over the cord stay. Term inate it on the BK ,#___ P-ISE457

punching. ___i_:_ i• _
(5) Bend cord spade tips and dress red and _:_____ __

green conductors so they lie outside of

the mounting screw hole guides (Fig. 13).

(6) Seat base of plug in cover before tightening _

screws. This prevents pinching of

conductors.

423A PLUG

4.04 Connections for the 423A plug (Fig. 3) are

as follows:

(1) Make connections as indicated by color Fig. 10--D4BP Cord and Adapter

designations stamped adjacent to terminals.

(2) Connect cord tips as shown in Fig. 3.

(3) Lay jacketed portion of cord in the two s HOOK

molded U-shaped projections.

(4) Place cover on base and tighten screw.

504A PLUG

4.05 Connections for the 504A plug (Fig. 4) are

as follows:

(1) Place cord tip guide on block (Fig. 5). Fig. 1I---Bending S Hook

Page 6

G R

ISS 1, SECTION 461-630-105

(6) Position the cap assembly on the cord tip

guide and block; assuring that no leads are

pinched.

(7) Insert screw and tighten.

RM-658901

SELF-TAPPING P-284159

SCREW WASHER

Fig. 12--D4BP Cord Ready to Terminate

Fig. 13--D4BP Cord Terminated on 283B Plug

KS-8419 PLUG

505A PLUG

4.07 Connections for the KS-8419 plug are as

4.06 Connections for the505A plug (Fig. 6 and 7) followS.

are as follows:

(1) Plug components are assembled to TYREX

(1) Fit the cord tip guide into place on the top SJ3 No. 18 cord or equivalent (Fig. 8).

of the block.

(2) In TYREX SJ3 No. 18 cord or equivalent,

(2) Position the mounting cord into the cord the black conductor should be used for the

channel of the block so that the cord wingband ring (negative) side of the line. The white
fits into the wingband slot. One ear of the conductor should be used for tip (positive) side
wingband will extend into the wingband slot of of the line. The green conductor is the ground

the cord fastener, conductor.

(3) Fit the cord fastener into the groove in the (3) One terminal of the KS-8419 plug has a

cord channel and press until it snaps into small lug protruding from the contact. This

position, lug and the notched terminal on KS-8420 and

KS-8421jacks are provided to ensure that the

(4) Arrange the mounting cord spade tips in plug is inserted in one position only.

the socket type terminals.

(4) When ground is necessary for service, the

(5) Adjust the conductors so that they will not green conductor should be terminated on

obstruct the center of the cord tip guide, the notched terminal.

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7 Pages .