Bell System Practices 1634 Service Manual page 4

SECTION 502-611-402
NOTES FOR FIG. 2 AND 3:
1.
2.
:;.
4.
.i
(i.
'1,
8.
9,
10.
11.
12,
WHEN 657A, 599A OR 657B, 599B KEYS ARE USED IN FIRST MODULE, HOLD KEY LAMP (6TH LAMP) MAY BE USED
FOR A MISCELLANEOUS VISUAL SIGNAL. CONNECT INDICATED LEAD TO AN AVAILABLE LAMP GROUND. WHEN
656A OR 598A KEY IS USED IN FIRST MODULE, INDICATED LEAD IS CONNECTED TO GROUND ON TERMINAL 5 OF
TB1.
WHEN 656A OR 598A KEY IS USED IN FIRST MODULE, INDICATED LEAD IS CONNECTED TO TERMINAL A (1634 SET)
AND TERMINAL 1A (1635 SET) OF TBVL
WHEN 656A OR 598A KEY IS USED IN THIRD MODULE OF 1634 SET, INDICATED LEAD IS CONNECTED TO TERMINAL
.5 OF TB3.
TO CONVERT A PICKUP KEY FROM LOCKING TO NONLOCKING THE CONVERSIONS SHOWN IN TABLE B MUST BE
FOLLOWED. A P-11E977 INSULATING DETAIL MUST BE PLACED OVER THE TWO KEY CONTACTS ADJACENT TO
THE KEY PLUNGER. REMOVE THE SCREW DETAIL P-1OE837 ENTIRELY FROM THE PLUNGER AT THE KEY POSITION
TO BE CONVERTED.
CUTOFF OF THE INTERNAL RINGER CAN BE PROVIDED USING THE 657B OR 599B KEY IN FIRST MODULE. TRANSFER
B1 (R-BL) [BR-W] LEAD FROM TERMINAL
A
OF TERMINAL BOARD (TEL. SET) TO TERMINAL 6 OF TB1. TRANSFER
(R) [S-BK] LEAD FROM TERMINAL 5 OF TB1 TO TERMINAL 3 VACATED B1 LEAD.
WHEN 657B OR 599B KEY IS USED IN FIRST MODULE TO PROVIDE CUTOFF, SWITCHING, OR TRANSFER FEATURES,
TRANSFER (Y-BR) [Y-BK] LEAD FROM TERMINAL 6 OF TB1 TO TERMINAL SG OF rBV1. THESE SERVICE FEATURES
ARE PROVIDED BY AN AUXILIARY RELAY (229B KTU OR EQUIVALENT) SEPARATELY MOUNTED AND CONTROLLED
BY THE TURN KEY CONTACTS THROUGH THE LG5, C, S, S1 LEAD.
CONTACTS OF TURN KEY CONNECTED TO PINS 9 AND 11 MUST BE ISOLATED FROM EACH OTHER WITH INSULATING
DETAIL P-13E443 (FURNISHED WITH 657B OR 599B KEY) TO PREVENT INTERFERENCE WITH WORKING CIRCUITS.
THE TURN KEY LAMP CAN BE ILLUMINATED IN ACCORDANCE WITH OR INDEPENDENT OF TURN KEY OPERATION.
WHEN THE 617A KEY IS REQUIRED AS A DUAL PUkPOSE KEY, THE BRASS STRAP BETWEEN THE S1 AND SG
TERMINALS OF THE KEY MAY BE REMOVED. USE MIW CORD OR EQUIVALENT TO CONNECT S1 TERMINAL OF
617A TO A DISSIMILAR GROUND OR A NONGROUNDED CIRCUIT.
CORDS MANUFACTURED BEFORE APRIL 1968 HAVE SOME LEADS SOLDERED TO THE TB.
WHEN 661- OR 667-TYPE TRANSMI'ITER IS USED IN THRID MODULE OF 1634-SETS, REMOVE INDICATED IrEAD AND
INSULATE.
WHEN SPEAKERPHONE CONTROL UNIT IS LOCATED NEAR TELEPHONE SET, A 148A (MD) OR 148B
BE INSERTED BETWEEN CONNECTOR 1 AND PLUG 1 OF THE 1634- OR 1635-TYPE TELEPHONE SET.
* LEADS .~RE SPADE TIPPED, INSULATED, AND STORED.
: NOT REQUIRED FOR :\-TYPE SPEAKERPHONE SYSTEM.
X IF CONNECTED
TO
148-TYPE ADAPTER. INSULATE AND STORE THESE LEADS AT TERMINAL.
( ) CURRENT COLOR CODE.
[ 1 MD COLOR CODE.
ADAPTER MAY
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