2.12
The 680AE transmitter provides RF I and
static discharge protection and replaces all
other 680-type transmitters listed previously.
Note:
Whenever the 680AD transmitter is
used with either a 108A or 108AR loudspeaker
set it is necessary to install a 106A varistor
(shipped with the transmitter) between terminals
7 (TVL) and 5 (GRD) in the loudspeaker set
to prevent damage to the loudspeaker set from
discharge of static electricity.
D. 108A (MD), 108AR (MD), or 108AA Loudspeaker
Set
2.13
The loudspeaker set contains the electronic
circuitry, the loudspeaker, and the relay
and transformer necessary to couple to the telephone
system.
The electronics, loudspeaker, and cord
comprise the non-color-significant subassembly, and
a color significant plastic housing completes the
set.
Fig. 4-Typical 108-Type Loudspeaker Set With Cover
Removed
2.14
The 108AA loudspeaker replaces the 108A
and 108AR loudspeakers and provides the
following additional options or features:
•
Improved RFI suppression
•
Protection against discharge of static electricity
•
Provision for increased switchguard action
by means of screw terminal connections.
( Refer to paragraph 5.02.)
Note:
W henever the 108A or 1 08A R
loudspeaker set is used with the 680AD
transmitter it is necessary to install a 106A
ISS 5, SECTION 512-700-100
varistor (shipped with the transmitter) between
terminal 7 (TVL) and 5 (G RD) in the loudspeaker
set to prevent damage to the loudspeaker set
from discharge of static electricity.
E.
82A (MD) or 82B Connecting Block
2.15
The 82-type connecting block is used to
interconnect the 4A speakerphone system
(680-type transmitter, 108-type loudspeaker set,
and the 85Bl power unit) for use with plug-ended
6-button key telephone sets. A reversible option
plug provides the key system options, ringer cutoff
or operation of an auxiliary relay. The connecting
block includes three 50-pin connectors, one for the
telephone set, one for the key system connector
cable, and one that accepts the transmitter and
loudspeaker set connectors with the reversible
option plug. The arrow on the plug of the D20N
mounting cord should point to the option required
on the option plug. There are seven screw terminals
on the 82A and eleven screw terminals on the 82B
connecting block (Fig. 9 and 10).
Fig. 5-82-Type Connecting Block With Cover Removed
2.16
The 82B is the same as the 82A connecting
block with the exception that on the 82B
access to terminals 10 and 35 from the speakerphone
plug and terminals 21 and 46 from the telephone
set and line receptacle are made available by means
of screw-type terminals (Fig. 9).
F.
223A (MD), 223C, or 223D Adapters
2.17
The 223-type adapter (Fig. 6) interconnects
the 680-type transmitter, the 108-type
loudspeaker set, the 85Bl power unit and certain
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