Bell System Plant Series Service Manual

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BELL SYSTEM PRACTICES
Plant Series
SECTION 502-610-410
Issue 1, June 1970
AT&TCo Standard
SERVICE
636- AND 637-TYPE TELEPHONE SETS
1. GENERAL
1.01
This section contains connection and maintenance
information for 18- and 30-button general
purpose CALL DIRECTOR:;.; telephone sets equipped
with headset jacks.
1.02
Connection information for these sets was
formerly contained in Section 502-636-401
which is hereby canceled.
1.03
These sets are not intended for use with
:3-type speakerphone systems.
2. CONNECTIONS
2.01
These sets are factory-wired for use with
1A1, 1A2, or 6A KTS line circuits. They
may also be used with 1A KTS line circuits by
modifying the set as shown in Table A. Line
circuits for 1A, 1A1, or 1A2 KTS may be connected
to the same set under the following conditions:
(a) 1A1 or 1A2 KTS lines must be connected
to the first key units with 1A lines connected
to supplementary key modules.
(b) 1A, 1A1, or 1A2 KTS lines should not be
connected to the same 6 line key module.
(c) 1A, 1A1, or 1A2 KTS lines appearing behind
a manual switchboard should not be
intermixed or a CALL DIRECTOR telephone set
due to the different time out intervals provided
by the associated KTU's.
2.02
These 636- and 637-type (rotary dial) telephone
sets are equipped with 517 A jacks for the
plugs of a G3L handset, 52- or 53-type head
telephone set. The internal wiring is arranged to
electrically connect either the line switch or the
headset jacks to the line.
2.03
Replacement or substitution of the key in
the first module may require wiring changes
as shown in the notes for Fig. 4 and 5.
Some spade-tipped conductors or
mounting cord leads are insulated
with tubing which should be cut off
with electrician scissors or diagonal
pliers. Other conductors are insulated
with stiff plastic pockets. Pinch open
the mouth to release the spade tips.
2.04
When station busy lamp feature is required
with these sets having 1Al or 1A2 KTS line
circuits, a P-90D033 Printed Wiring Board Assembly
must be ordered separately and installed in the
636- or 637-type telephone set. With this option,
the busy lamp will light whenever a line pickup
button is depressed and the handset is off-hook or
the headset is plugged into the jack. Install the
wiring board assembly as follows:
(1) Remove set housing.
(2) Loosen screws on dial mounting plate, move
mounting to left and lift out.
(3) Remove right-hand dial mounting screw.
(4) Place dial mounting screw through hole in
wiring board and replace screw in dial.
Components on board should be positioned so
as not to interfere with other set components
when dial mounting plate is replaced.
(5) Replace and secure dial mounting plate.
(6) Connect wiring board leads and make wiring
changes as shown in Fig. 6. For a schematic
on the printed wiring board assembly refer to
SD-69580-01.
2.05
Sets equipped with a Dl20C mounting cord
manufactured prior to III-G8 must use circuit
per Fig. 7 to provide station busy lamp feature.
2.06
Tip, ring, A and lamp leads of lines wired
for supplementary hold feature must be
routed per SD-69;);)0-01 and section in Division 518
rather than directly to the line circuit. Supplementary
@
American Telephone and Telegraph Compan:v. 1970
Printed in U.S.A.
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