Bell 502-580-412 Service Manual

BELLSYSTEMPRACTICES SECTION502-580-412
AT&TCo Standard Issue5, May 1981

SERVICE

514B AND 514BM TELEPHONE SETS

CONNECTIONS

1. GENERAL

1.01 This section contains information for the 514B

(MD) and 514BM telephone sets.

1.02 This section is reissued to revise the 241B

amplifier connections, Fig. 1 and 2.

Not for use or disclosure outside the

Bell System except under written agreement

NOTICE

Printed in U.S.A. Page 1

SECTION502-580-412

DIOP HEADSET NIA G3 -TYPE
MTG CORD AND PUSH TO RINGER DIAL HANDSET

T (W-BL)

a OR B I (W-S ) _...... (BK) ¢ (BL)

(NOTE I) X IS) = DP (BLORG) (_

R OR RI (S-W) (S)

(NOTE I ) _' (_ A

R (BL-W) (R)

FLASH KEY

(S-R)-

-W

=(R) (_)

(S-R)

HS>_

qP---- /C

_m IS'v] (G) dye - (W) IS-BR] (W)

¢'I

-_ - (BK-S) % (R)

•- r, - R /

(BL) (BL)

(R) p4 (W)

<

k (w) (w)

IS-R] (R) _f

[S-BK] (BK)fg

(w)

(W-G),, _-HS ,"ON

o_

(W-BR) 5 (Y-G)

(W-G) Q E) <
(w) (_ \

) (BK)

L__

-_ (S-BK) B

HS_-- (_

IS-G] (Y)

I

AI OR G (O-W) ,I (G-BK) - h

A (W-O) NOTES:

[S-W] (BR) 2. WHEN MESSAGE WAITING LAMP (D-179968 OR D-179969 KIT Of

L OR BL (G-W) El AND E2.

LG (W-G) RING CONTACTS OF THE LINE SWITCH MUST BREAK BEFORE THE A-LEAD CONTACTS.

BZ (BR-W) _. AND 4 OF 241B AMPLIFIER WERE REVERSED. WIRE AMPLIFIER AS

BZ ! (W-BR)

( )-CURRENT COLOR CODE FL - FLASH KEY CONTACTS

[ ] - MD COLOR CODE -N- - INSULATE AND STORE

DP - DIAL PULSE CONTACT

ON- DIAL OFF-NORMAL CONTACT

HS - HEAD SET ON-OFF KEY CONTACTS

(NOTE 2) 3. TO PREVENT FALSE HOLD CONDITION WHEN GOING ON HOOK THE TIPAND

(s-v) I l l i c_I

I. CONNECT TO T IP AND RING OR TO COMMON OR PRIVATE LINE

RINGER CIRCUIT AT CONNECTING BLOCK AS REQUIRED.

PARTS) IS PROVIDED, CONNECT LAMP LEADS TO TERMINALS

4. IN SETS MANUFACTURED PRIOR TO JULY 1980, LEADS ON TERMINALS 1

SHOWN TO PREVENT TELEPHONE CIRCUIT FROM OSCILLATING.

GN .. (BR)

3 (BK) /

<

Page 2

Fig. 1--j514B (MD) Telephone Set, Connections_l