Bell 502-580-411 Service Manual
BELLSYSTEMPRACTICES SECTION502-580-411
AT&TCo Standard Issue 4, July 1981
SERVICE
500W/Y AND 500YM TELEPHONE SETS
CONNECTIONS
1. GENERAL phasize the more significant changes.
1.01 This section contains information on 500W/Y • Show 500W/Y (MD), Fig. 1
(MD) and 500YM telephone sets.
1.02 The reasons for reissuing this section are • Change information on the500YM (modular)
listed below. Revision arrows are used to em- telephone set, Fig. 2.
Not for use or disclosure outside the
Bell System except under written agreement
NOTICE
Printed in U.S.A. Page 1
SECTION502-580-411
L.,N "...A
CC'RD MOTE5) DIAL NETWORK
WIRE I ! I __M_'G ON NET. NEON LAMP ;WITCH OR 9-TYPE OR 4ZSE HANDSET
TIP (S) B L! B (G)IS-G] dxe _ (W) IS-W]
OBL) .- (eL) I
...... I
) I
RINGER [] (G) OR (BL) ,J.
(NO (NOTES 2,3,4) !
(Y) [s-Y] []
,(s c Q
I
k-.-1
RR
GRD_ (Y) (BK) = (R) [S-R]
• Jil
|I| ,.Fs., c
(R) :
ON (w) R
t (w)
(BK) [S-BK]
1
NOTES: ( I ) bc MAKES
1. FORMANUALSERVICEREPLACEDIAL WITH APPARATUS (2) de MAKES
BLANK, MOVE(W) IS-W] FROM"F" TO "RR" TERMINAL. (3) ob BREAKS
2.-TO SILENCE RINGER PERMANENTLY FOR ALL CLASSES (4) gf BREAKS
OF SERVICE REFER TO SECTION 501-250-303. ( ) CURRENT COLOR CODE
3. SET WIRED FOR RING PARTY SERVICE. FOR TIP PARTY [ ] 14DCOLOR CODE
SERVICE REVERSE (R) AND (G) MOUNTING CORD LEADS
AT CONNECTING BLOCK. FOR INDIVIDUAL OR BRIDGED DP DIAL PULSE CONTACT
PARTY SERVICE CONNECT (Y) HOUNTING CORD LEAD TO ON DIAL OFF-NORMAL CONTACT
G TERMINAL AT CONNECTING BLOCK.
4. CONNFCTIONSFOR C4B RINGER SHOWN. IF C4A RINGER
IS USED, WIRE AS FOLLOWS:
(BK) TO G
(S) TO K
(S-R) TO A
(R) TO L2
REMOVE (S)STRAP FROM A TO L2 OF NETWORK.
Fig. 1--1_500W/Y (MD) Telephone Set, Connections4
5. LINE SWITCH SEQUENCE,HANDSETREMOVED.
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