Bell System CALL DIRECTOR 2634DA Service Manual

BEU SYSTEM PRACTICES
AT
&
TCo Standard
SECTION 502-612-409
Issue 5
,
March 1977
SERVICE
2634DA, 2634DAM, 2635DA, AND 2635DAM TELEPHONE SETS
1. GENERAL
1.01
This section contains connection and maintenance
information for 2634DA (MD), 2634DAM
(18-button) and 2635DA (MD), 2635DAM (30-button)
CALL DIRECTOR® telephone sets.
1.02
This section is reissued to:
• Show 2634DA and 2635DA telephone set MD
• Show D50AH and D80D mounting cords MD
• Add D50BD and D80E mounting cords.
1.03
Nonmodular 2634DA and 2635DA telephone
sets are furnished from the factory equipped
with a G3-type handset and cord. Modular 2634DAM
and 2635DAM telephone sets are equipped with a
G15A handset, H4DU handset cord, and 616E jack
assembly (Fig. 1).
2. CONNECTIONS
2 .01
These sets are factory-wired for use with
1A1, 1A2, or 6A KTS station line concentrators.
Refer to Division 518 for connections using 235-
or 236-type key telephone units.
2.02
A 235-type KTU is associated with each
2634-type telephone set and a 236-type KTU
with each 2635-type telephone set . Because of
t he single commo n talking and control lead pattern
in t hese sets, a line concentrator KTU must be
associated with each telephone set installed and
cannot be shared, eve n on a bridged station basis.
2.03
The 2634- and 2635-type sets that are
provided with D50AH (MD) or D80D (MD)
mounting cords require contact strip assemblies on
the 635-type keys. These sets are normally provided
with a 635A5C key (5-line pickup and hold ) in the
first module.
If desired,
t he 635A5C key can be
replaced with a 635AD5C key (4-line pickup, cutoff,
and hold). In this case the contact strip assemblies
for the 635AD5C key (840151039 and 840151047)
are furnished with the key.
Note:
• contact strips are not required with
sets equipped with D50BD or D80E mounting
cord. A and A1 are common to all pickup
buttons through internal mounting cord wiri ng .•
2.04
Because of the physical arrangement of the
635-type key, t he contact strips do not extend
to the chaining switch. This requires additiona l
A1 leads to each module (except t he last), to extend
A lead control.
2.05
Mounting cords of these CALL DIRECTOR
sets terminate in individual plugs co nnected
to t he rear of the keys. This permits rearrangement
of line appearances either in the set or at the key
equipment distribution point. Current production
sets are equipped with a satin-silver (-87) mounting
cord.
2.06
.The D50AH (MD) and D80D (MD) mounting
cords are replaced by D50BD and D80E,
respectively .•
2.07
All line key positions are convertible from
pickup (locking) to signaling (nonlocking).
To convert a key position to signaling, remove t he
812857738 (P-28E773) screw detail from the key
position involved and place 840157671 insul ating
details over the two key contacts adjacent to the
plunger (refer to Section 512-230-101). Make
necessary wiring changes as shown in Table A for
2634DA or DAM and Table B for 2635DA or DAM.
Note: If more than six signali ng keys are
required, replace 635G5C key in last module
with a 658A key.
2.08
The 2634DA or DAM and 2635DA or DAM
telephone sets are factory equipped with a
KS-20419L1 (10 volt AC only) buzzer. Provisions
NOTICE
Not for use or disclosure outside the
Bell System except under written agreement
Printed in U.S.A.
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