AT&T Bell System 2636 Series Service Manual

BEU SYSTEM PRACTICES
AT
&
TCo Standard
SECTION 502-612-410
Issue 7, February 1982
SERVICE
LIBRARY
2636- AND 2637-TYPE TELEPHONE SETS
CONNECTIONS AND MAINTENANCE
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1. GENERAL
1.01
This section contains information on 2636CA
(MD), 2636CAM (MD), or 2636CAMS1 (IS-
button) and 2637DA (MD), 2637DAM (MD), or
2637DAMS1 (30-button) CALL DIRECTOR® tele-
phone sets equipped with headset jacks (Fig. 1 and 2).
1.02
The reasons for reissuing this section are
listed below. Revision arrows are used to em-
phasize the more significant changes.
• Add 6B KTU
• Add KS-20419L2 buzzer
• Add Fig. 7 and 9
• Change 241B amplifier connections, Fig. 1
and 2.
2. CONNECTIONS
2.01
These sets are factory-wired for use with lAl,
1A2, 6A, or 6B KTS line circuits. They may
also be used with lA KTS line circuits by modifying
the set as shown in Tables A and B. Line circuits for
lA, lAl, or 1A2 KTS may be connected to the same
set under the
f~llowing
conditions.
(a) The lAl or 1A2 KTS lines must be connected
to the first key units with lA lines connected
to supplementary key modules.
(b) The lA, lAl, or 1A2 KTS lines should not be
connected to the same six line key module.
(c) The lA, lAl, or 1A2 KTS lines appearing be-
hind a manual switchboard should not be in-
termixed on a CALL DIRECTOR telephone set due
to the different time-out intervals provided by the
associated KTUs.
2.02
The new S coded sets are similar to the previ-
ous type sets except for a new line switch
which breaks both the tip and ring side of the line.
Previous sets only broke the ring side of the line.
2.03
These sets are equipped with a 635A5C (5-line
pickup and hold) key in the first module posi-
tion. Contact strip assemblies [required with sets
equipped with a D120K (MD) or D200S (MD) mount-
ing cord] differ between 635A5C and 635AD5C keys.
If
ordered for field replacement, the 635AD5C key is
furnished with a piggy-back adapter to which the
slate mounting cord plug is connected. The necessary
contact strip assemblies (840151039 and 840151047)
will be shipped with the 635AD5C key, and will re-
place the 840151120 and 840151138 assemblies sup-
plied with the 635A5C key. Cut-off key connections
for the 635AD5C key are shown in Table C.
2.03
Because of the physical arrangement of the
635-type key, the contact strips do not extend
to the chaining switch. This requires a second tip and
ring conductor to each module (except the last). See
Fig. 3, sheets 1 through 5.
2.04
The line conductors of the mounting cords for
these sets terminate in individual plugs on a
per line basis and are connected to the rear of the
keys. This permits rearrangement of line appear-
ances either in the set or at the key equipment distri-
bution point. Current production sets are equipped
with a satin-silver ( -87) mounting cord.
2.05
All line pickup key positions are convertible to
signaling or common signaling arrangements
by removing the 812857738 (P-28E773) screw detail
from key positions involved and making the neces-
sary wiring changes per Table D.
2.06
These sets are not intended for use with
speakerphone systems.
2.07
The 2636- and 2637-type telephone sets are
factory equipped with a KS-20419Ll or
•KS-20419L2f (10 volt ac only) buzzer.
NOTICE
Not for use or disclosure outside the
Bell System except under written agreement
Printed in U.S.A. Page 1
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