Bell 502-721-402 Service Manual

BELLSYSTEMPRACTICES SECTION502-721-402

AT&TCo Standard Issue 7, October 1981

SERVICE

702B AND 702BM TELEPHONE SETS

CONNECTIONS

1. GENERAL • Show new line switch contacts (d', e') in Fig.

1.01 This section contains information on the 702B • Add D-181059 Kit of Parts (dial illumination,

(MD) and 702BM telephone sets (Fig. 1, 2, and Fig. 3).

2

3).

1.03 Refer to Tables A, B, and C for line and ringer

1.02 The reasons for reissuing this section are

listed below. Revision arrows are used to em- 1.04 Figure 4 or 5 indicates the termination of the

phasize the more significant changes. D4BT mounting cord in sets equipped with

• Revise grounding information (Note 1, Fig. 1 1.05 Refer to Section 501-320-100 if conversion to

and 2) four- or eight-party ringing is required.

connections.

4010- or 4228-type networks, respectively.

Not for use or disclosure outside the

Bell System except under written agreement

NOTICE

Printed in U.S.A. Page 1

SECTION502-721-402

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NOTES:

I. INSIDE WIRE CONDUCTOR SHALL BE CONNECTED TO THE GROUND TERMINAL

2. CONNECTIONS SHOWN FOR D5AK MOUNTING CORD. IF D4BT MOUNTING CORD

3. WIRED FOR BRIDGED RINGING, SEE TABLE A OR B FOR OTHER CLASSES DP-D_AL PULSE

4. TO SILENCE RINGER PERMANENTLY REFER TO THE APPROPRIATE RINGER

5. DASHED LINES INDICATE MANUAL SET CONNECTIONS.

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AT THE PROTECTOR OR EQUIVALENT ONLY IF REQUIRED FOR SERVICE ( ) CURRENT COLOR CODE
BEING INSTALLED. [ ] MD COLOR CODE

IS USED, REFER TO TABLE B. * INSULATED AND STORED

OF SERVICE, ON- OFF NORMAL

SECTION IN DIVISION 501.

........................ +ii!i!;!i :i:iisi_)i [ S- Y ] L2

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/

Page 2

Fig. 1--1_702B (MD) Telephone Set, Connectionse

ISS 7, SECTION502.721-402

Page 3

SECTION502-721-402

NOTES: 2012C 248B I D4BU-29 |623P4

1. P/O D-181059KIT OF PARTS. TRNSF ADAPTERI CORD |JACK

INSTALLED.

3. CORDFROMTELEPHONESETAND
TRANSFORMERCANBEPLUGGED
INTOEITHERJACKOF 338A

ADAPTER.

4. ORDEREDSEPARATELY.

5. SET IS FACTORYWIREDFOR
BRIDGEDSERVICE.FOROTHER (-...-

CLASSESOFSERVICESEETABLEC.

6. TO SILENCERINGERPERRANENTLY
REFERTOTHEAPPROPRIATERINGER

SECTIONIN DIVISION 501.

7. CURRENTPRODUCTIONSETSHAVE LINE 625-TYPE
CONTACTSd', e' ANDASSOCIATED WIRE CONN

(BR-W)AND(S-W) LEADS. (NOTE2) BLOCK

* INSULATEDANDSTORED. CORD

GRD D4BU-
TIP
RING

SPARE (BK) (BK)

(G)
(R)

Page 4

(Y)

Fig. 3--1_702BM Telephone Set,ConnectionsUsing D-181059 Kit of Parts (Sheet 1 of

2)e

RINGER DIAL LARP DIAL NETWORK H4DU G15A

(NOTES5 ANDNIGHT HANDSETHANDSET

AND6) LIGHT SWITCH CORD

CLOSE
FOR

NIGHT
LIGHT (H)

(S-R)

LINE SWITCH -I-PULSE
k (NOTE7) (G)

(0) j RR

b v¢ (BR) C

o

(G) K

_(S-R) . A

- L2

_(S) .

v

(BL) F

OR

(R) ] _ (W)

If R / k (R)

(BK)

_R)

ISS 7, SECTION502-721-402

(NOTE4)

] \ > (G)

] . (BK)

H

L1

(BR-N)
(S-W) _ 6

Fig. 3--1_702BM TelephoneSet, ConnectionsUsing D-181059 Kit of Parts (Sheet 2 of

2)¢

Page S

SECTION502.721-402

D4BT D4BT

NG

NOTES: (_

I. MTG CORD SPADE TIPPED

LEADS ARE SHOWN DRESSED

IN DESIRED POSITIONS. L2 LEADS ARE SHOWN DRESSED

2. DRESS THE (G)MTG CORD AND NETWORK IN DESIRED POSITIONS.
(BK) RINGER LEAD UNDER THE

(BK) HANDSET CORD LEAD.

GN LI MTG CORD SPADE TIPPED

NOTE :

Fig. 4--Method of Terminating D4BT Mounting Cord on Fig. 5mMethod of Terminating D4BT Mounting Cordon

SetsWith 4010-Type Network (See Notes land SetsWith 4228-Type Network (SeeNote)

2)

Page 6

ISS 7, SECTION 502-721-402

TABLE A

LINE AND RINGER CONNECTIONS

702B (MD) TELEPHONE SET WITH D5AK (MD) MOUNTING CORD

WIRE OR LEAD OR RING NO IDENTIFYING GROUND

Inside Wire Ring R R R R R

at Tip G G G G G

Conn Block

Dial Light 1 Y Y Y Y Y

Transformer 2 B B B B B

D5AK

Mtg Cord (G) G G R R R

at (Y) G Y Y Y Y

Conn Block

D5AK

Mtg Cord (G) L1 L1 L1 F F

at (Y) G G G G G

Set Terminals

(Note 2)

Ringer (BK) G G G G G

Leads

(Note 1)

Grd Y Y Y Y Y

(R) R R G G G

(BK) S B B B B
(W) Y Y Y Y Y

(R) L2 L2 L2 L2 L2

(BK) 4"t" 4t 4# 4t 4J"
(W) 3t 3t 3, 3t 3t

(R) K K K K K

(S) * * * L1 *
(S-R) * * * * L1

INDIVIDUAL

BRIDGED _ PARTY _ IDENT 1000 2650

GRD

TIP PARTY

OHMS OHMS

Line Switch (W) F F F B B

Strap

from H (BK) A A A * *

Note 1" To silence ringer for all classes of service, refer to the appropriate ringer section in Division 501.

Note 2" When connecting the D5AK mounting cord leads for tip party identifying ground, use D-161488 connectors

• Insulated and stored.
j- Terminals on lamp terminal block.

and MlW straps as required to extend conductor leads.

Factory-wired for bridged or ring party

Page 7

SECTION 502-721-402

TABLE B

LINE AND RINGER CONNECTIONS

702B (MD) TELEPHONE SET WITH D4BT MOUNTING CORD

WIRE OR LEAD OR RING NO IDENTIFYING GROUND

Inside Wire Ring R R R R R

at Tip G G G G G

Conn Block

Dial Light 1 Y Y y y y

Transformer 2 B B B B B

D4BT

Mtg Cord (G) G G R R R

at (y) y y y y y

Conn Block

D4BT (R) L2 L2 L2 L2 L2

Mtg Cord (G) L1 L1 L1 F F

at

Set Terminals (Y) 3t 3t 3t 3t 3t

Ringer (BK) L1 3t 3t 3t 3t

Leads

(Note)

Grd Y Y Y y y

(R) R R G G G

(BK) B B B B B

(BK) 4t 4t 4t 4t 4t
(R) K K K K K

(S) * * * L1 *
(S-R) * * * * L1

INDIVIDUAL

BRIDGED IDENT

PARTY

GRD

TIP PARTY

1000 2650

OHMS OHMS

Line Switch (W) F F F B B

Strap

from H (BK) A A A * *

Note." To silence ringer for all classes of service, refer to the appropriate ringer section in Division 501.

• Insulated and stored.
t Terminals on lamp terminal block.

Page 8

ISS 7, SECTION 502-721-402

TABLE C

702BM TELEPHONE SET LINE AND RINGER CONNECTIONS

TIP PARTY

INDIVIDUAL IDENTIFYING GROUND

WIRE OR LEAD OR RING (NOTE 1)

BRIDGED PARTY NO .
(NOTE 3) IDENT 1000 2650

GRD OHMS OHMS

Dial Light 1 Y Y Y Y Y

,.

Transformer 2 B B B B B

623P4
Jack

Assembly

(a) L2 L2 L1 F I F
(G) L1 L1 L2 L2 L2

in Set (BK) 4t 4t 4t 4t 4t

(Y) 3t 3t 3t 3t 3t
(a) K K K K K

Ringer (BK) L1 3t 3t 3t 3t

Leads
(Note 2) (S) * * * L1 *

(S-R) * * * * L1

Line Switch (W) F F F B B

Strap from H
of Net. (BK) A A A * *

Notes:

1. For tip party service with identifying ground, remove insulate and store (BK) strap between network

terminals A and H.

2. To silence ringer for all classes of service, refer to the appropriate ringer section in Division 501.

3. Sets are factory-wired for bridged service.

•Insulated and stored.
tTerminals on lamp terminal block.

' 9 Pages

Page 9