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SECTION 502-612401
2.06
Refer
to Table
C for
connections
when
635AD5C cut off key is used in first module.
2.07
All line pickup key positions
are convertible
to signaling or common signaling arrangements
by removing
the 812857738 (P-28E773) screw from
key positions
involved
and making
the necessary
wiring changes
per Table D.
2.08
A KS-20419L1
(10 volt ac only) buzzer
is
factory-installed
for use as a second audible
signal, when required.
This arrangement
uses (S-Y)
and (Y-S) mounting cord conductors from (0) binder
in the second module (Fig. 4).
2.09
These
sets
may
be used
with
either
the
3-type (MD) or 4A speakerphone
systems.
2.10
Sets
may
be equipped
for
3-type
(MD)
speakerphone
by the
addition
of a 679A
(MD) transmitter
in the 3rd (2630-type)
or 5th
(2631-type)
module
(Fig. 5).
Refer
to Section
512-620-440
for
necessary
wiring
changes
and
connections.
2.11
When the 3-type (MD) speakerphone
control
unit is located
near the telephone
set and
an internal
transmitter
(679A) is used, an A25B
connector
cable should
be plugged
into the last
mounting
cord plug and terminated
on the 55-type
control
unit terminal
board.
2.12
To retain
the maximum
number
of keys in
the CALL DIRECTOR
telephone
sets and
still have 3-type (MD) speakerphone
feature, a 666A
(MD) or 666B (MD) transmitter
and 760A (MD)
loudspeaker
may be installed
as adjuncts
to the
telephone
set.
Spare
leads
and hold key lamp
leads from
the first
module
are used to supply
the external
speakerphone
function.
When control
unit and telephone
set are at same location,
an
auxiliary
mounting
cord
(D1OR) may
be used.
Refer to Section 512-620-440 for complete connections
to 3-type (MD) speakerphone.
2.13
Refer to Section 512-730-400 for connections
to the current
4A speakerphone
system.
2.14
The hold key in the first
module
is used
for normal
hold functions
or if required
1
Hold.
An additional
hold key can be installed
in
the second key module location for Priority HoM.
The D-180411 Kit of Parts
consisting
of a 635A5C
key, two contact strip assemblies,
and a pink plug
assembly
must be ordered
separately
for Priority
Hold.
(a) Install
as follows.
(1) Unplug and remove existing
635G5C key
from second module.
(2) Install contact strips and associated
leads
if applicable
(see note).
Note:
Contact
strips
are not required
with
sets
equipped
with
a D120M
or D200AA
mounting cord or sets equipped with a modified
D120K or D200S mounting
cord.
(3) Place the pink plug assembly
from the
kit of parts into the hold position on the
635A5C key.
Insulate
and store the white set
plug. Place the remaining
set plugs into there
proper
positions
on the key.
(4) Make
the
necessary
wiring
connections
and modifications
as shown in Fig. 6.
2.15
When required,
these sets may be equipped
with
a polarity
guard.
Polarity
guards
should
be installed
only when specified
by local
instructions
for end-to-end
signaling purposes when
battery
and
ground
reversals
are
encountered.
An 840364376 guard
assembly
must
be ordered
separately
and connected
as shown in Table E.
2.16
For station
busy lamp feature
with 3-type
(MD) or 4A speakerphone
system,
refer to
Fig. 7 and 8, respectively.
3.
MAINTENANCE
3.10
Maintenance
of these sets should be limited
to replacement
of items
available
through
regular
supply
channels.
Refer to the reference
Section 502-603-100.
3.02
Maintenance
of components
of these
sets
such
as dials,
ringers,
etc. is covered
in
sections
pertaining
to the particular
component.
Maintenance information common to CALL DIRECTOR
sets can be found in Section 502-600-100.
3.03
Do not use sokents
to clean plastic
parts of these sets.
Use a damp cloth
only.
If discolored,
replace part.
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