Clear-Com KB-112 Instruction And Service Manual
KB-112
Speaker
Station
INSTRUCTION
and
SERVICE
MANUAL
I
i
~jliClear-Com
IF
Iintercom
Systems
945
Camelia
St.
Berkeley,
California
94710
510-527-6666
Clear-Com
810027
8/15/88
REV.
C
KB-112
RENOTE
STATION
OPERATION
&
SERVICE
MANUAL
Table
of
Contents
Section
Page
I
Introduction
to
the
KB-112
................
1
II
Installation
..............................
3
III
Operation
.................................
4
IV
Parts
Listing
.............................
7
V
Technical
Theory
of
Operation
.............
7
VI
Specifications
............................
9
Illustrations
Figure
1:
KB-112
Mounting
Dimensions
.........
2
Figure
2:
Portable
Unit
Connection
...........
2
Figure
3:
PC
Board
Lay-Out
...................
5
Figure
4:
Typical
Program
Feed
...............
6
Figure
5:
Block
Diagram
......................
8
Figure
6:
KB-112
Schematic
...................
9
I.
INTRODUCTION
TO
THE
1B-112
REMOTE
SPEAKER
STATION
The
KB-112
is
a
versatile,
single-
112's
operator.
channel
Remote
Station
that
pro-
vides
two-way
(talk/listen)
com-
municating
ability.
Compatible
The
KB-112
front
panel
contains
a
with
all
Clear-Com
intercoms,
the
red
LED
that
lights
whenever
the
KB-112
is
ideal
in
places
where
mic
is
active.
This
is
especially
wearing
a
headset
is
not
feasible:
helpful
when
your
KB-112
is
remote-
dressing
rooms,
security
entrances,
ly
controlled;
the
LED
shows
that
etc.
The
KB-112
has
a
push-to-talk
another
station
operator
has
turned
electret
mic
and
a
built-in
speaker
on
your
mic.
with
a
wide
frequency
response.
Other
KB-112
features
are
intercom
OPERATING
MODES
volume
control,
Visual
Call
Signal
The
KB-112
features
"control
logic"
button,
and
amber
Call
lamp.
CMOS
circuitry
for
programming
the
operation
of
the
station.
This
allows
remote
or
local
control
(or
PROGRAM
INPUT
both)
of
the
speaker
and
the
mic.
If
desired,
you
can
monitor
exter-
The
station
operator
pre-sets
a
nal
program
via
the
KB-112;
its
bank
of
dip
switches
that
are
lo-
wiring
terminal
strip
includes
an
cated
on
the
electronics
module.
access
point
for
input
from
the
If
pre-set
for
remote
control,
the
auxiliary
audio
source.
The
station
KB-112
speaker
and/or
mic
can
be
accepts
an
unbalanced,
line-level
activated
by
all
other
Clear-Com
singal
from
audio
gear
such
as
mic
stations
(on
the
same
channel,
mixers
or
portable
amps,
and
mixes
using
the
visual
signal
circuitry).
it
with
the
intercom
output
from
the
speaker.
The
KB-112's
operating
modes
are:
NORMAL:
Speaker
is
on.
Mic
is
locally
activated
by
pushbutton
on
INSTALLATION
front
panel.
The
KB-112
is
a
custom-mounting
station;
its
non-glare,
charcoal-
REHOTE
PACE:
Speaker
is
off
except
brown,
aluminum
front
panel
in-
when
turned
on
by
remote
control,
stalls
in
a
cut-out
in
the
wall
or
used
to
page
anyone
at
that
KB-
a
console,
or
inside
a
standard
6"
112's
location.
Mic
is
activated
x
8"
Nema
Type
1
box.
locally.
For
portable
use,
you
can
install
REMOTE
LISTEN:
Speaker
is
on.
Mic
the
KB-112
in
Clear-Com's
"P-Box,"
is
turned
on
locally
OR
by
remote
a
rugged,
lightweight
aluminum
en-
control,
which
allows
that
KB-112
closure
with
a
sloped
front,
walnut
operator
to
talk
"hands-free."
side
panels,
and
a
carrying
strap.
It
provides
3-pin
XLR
connectors
REMOTE
LISTEN-PAGE:
Speaker
is
nor-
for
input
and
extension.
mally
off.
Mic
remains
on
for
hands-free
talking.
Another
sta-
The
KB-112
connects
to
the
intercom
tion
can
turn
off
the
mic
and
turn
system
with
standard,
two-conductor
on
the
speaker
for
paging
that
KB-
(individually-shielded)
mic
cable.
KB-112
MOUNTS
IN
*
86.
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P
e
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6.5'
KB-
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Figure
2:
Portable
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Connection
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