Service manual
.1.
INSTALLATION
OF
THE
KB-112
The
KB-112
can
be
mounted
in
a
cut-
To
install
the
KB-112
in
the
P
Box:
out
in
any
surface,
or
it
can
mount
inside
a
6"
by
8"
Bl
ack
1)
Remove
the
plastic
header
from
(electrical)
Box
(minimum
depth,
the
terminal
block
(TBI)
on
the
3").
See
figure
1
for
dimensions.
KB-112
PC
Board;
pull
straight
up
to
lift
header
off.
The
KB-112
connects
to
the
intercom
system
through
its
five-screw
ter-
2)
A
similar
header
is
wired
to
the
minal
strip
(designated
as
"TB-i"
P-Box's
3-pin
connectors;
plug
on
the
PC
Board
Lay-Out;
see
Figure
that
header
onto
terminal
block
3).
Route
two-conductor,
shielded
TB-1.
The
header,
terminal
block
cable
(i.e.
Belden
8762)
from
the
and
PC
Board
are
clearly
la-
Main
Station
or
Power
Supply
output
belled
with
the
pin
numbers
to
connector
to
the
KB-112's
location.
ensure
proper
connections.
See
Unshielded
cable
may
be
used
where
Figure
2,
Portable
Unit
Connec-
AC
interference
is
not
a
problem.
tion.
After
preparing
a
surface
for
in-
3)
Attach
the
KB-112
to
the
enclo-
stallation
(refer
to
Fig.
1),
bring
sure
using
the
supplied
screws.
wiring
into
the
header
on
TBI
(the
If
desired,
attach
the
handle
terminal
block),
and
connect
leads
and
the
protective
rubber
feet
according
to
the
following
TB-i
pin
on
the
suitable
sides.
The
assignments:
enclosure
also
has
cut-outs
on
each
side
for
hanging
it,
in
any
Pin
1--Chassis
Ground
position,
from
the
wall,
a
con-
Pin
2--Program
Input
sole,
or
where
desired.
(or
no
connection)
Pin
3--Intercom
Audio
Use
standard
two-conductor
mic
ca-
Pin
4--+30
volts
DC
ble
to
interconnect
the
portable
Pin
5--Common
station
within
the
intercom
system.
The
pin-out
assignment
for
each
XLR
The
KB-112
may
be
mounted
inside
connector
is:
the
Clear-Com
Model
"P"
Box,
there-
by
becoming
a
portable
Remote
Sta-
Pin
1--
common
tion.
The
"P"
Box
is
a
sloped-
Pin
2--
+30
volts
DC
front,
sturdy
steel
enclosure
sup-
Pin
3--
intercom
audio
plied
with
a
handle,
rubber
feet,
and
screws
for
attaching
the
handle
Route
cable
from
the
Main
Station/
and
the
intercom
to
the
chassis.
Power
Supply
(or
other
Remote
Sta-
tion)
to
the
portable
KB-112
and
When
the
KB-112
is
mounted
in
the
input
to
the
female
connector.
Use
portable
enclosure,
it
connects
to
the
male
output
connector
to
the
intercom
system
with
the
3-pin,
"daisy-chain"
the
intercom
line
XLR-type
connectors
located
on
the
between
the
KB-112
and
another
side
of
the
chassis.
There
is
one
portable
Remote
Station.
female
connector
for
the
input
and
one
male
connector
for
extending
the
intercom
line
to
other
sta-
Before
operating
either
the
KB-112
tions.
Inside
the
box,
the
connec-
or
installing
it
in
the
portable
tors
are
wired
to
a
5-pin
header,
enclosure,
be
sure
that
the
unit's
which
you
plug
onto
the
terminal
dip
switches
are
set
to
the
desired
block
on
the
KB-112
PC
Board.
positions.
3