Service manual
Figure3
KB-
12
PC
BOARD
LAY-OUT
SWITCHING
0
a
.
*,TI
kO
CONTROL
"C
Qa
~
~
~
~~~~~~~S-2'EVRELOGIC'
~~~/.
.
R
E~
~f
J
SWITCHES
(
2
_
-53-2
534/
l
--
1
-49002$O
3-1
"MICUS
5
3-4
-
o,
S~~~~~~~t
Sets
micgain
for
distant
orcIoseuse
,,
s
2
<
~~~~~~~~~~~~~~~ON:
Distant
(high
sensitivity)
OFF:
Close
(lovwsensitivity)
ON:
Normal
Logic
OFF:
Reverse
Logic
53-3
'LISTEN
LOGIC"
ON:
Speaker
Control
Remote
Remote
Control
of
Mic
OFFt
Speaker
Control
Local
Connect
the
points
of
aremote
Push-to-Talk
button
('
...
entary-
O34
STALKeLOGICo
on'
type)
to
the
top
(Comcon)
and
middle
(N.0.)
terminals
of
OL
LIC"
OFF:
Mic
Control
Remote
switch
S-I
(next
to
C-20)
on
the
PC
Board.
OFMcoto~m
USING
THE
MIC
When
set
up
for
the
Normal,
Remote
nel)
wants
to
page
the
KB-112
ope-
Page,
or
the
Remote
Listen
mode
of
rator.
The
remote
operator
then
operation,
the
black
push-button
on
presses
his
Call
button,
which
the
KB-112
front
panel
determines
turns
off
the
KB-112
mic
and
LED
the
mic's
activity.
To
talk
on
the
and
turns
on
the
KB-112
Call
Light
intercom
channel,
press
this
and
speaker.
button.
As
long
as
you
press
it,
the
mic
is
"on"
and
the
red
LED
above
it
lights
up,
indicating
that
Distance
from
Mouth
to
Mic:
other
operators
can
hear
you.
A
fourth
internal
dip
switch
(des-
When
set
up
for
Remote
Listen,
the
ignated
as
"53-1")
determines
how
mic
will
also
turn
on
when
another
close
you
should
be
to
the
mic
when
Station
(which
must
be
on
the
same
talking.
This
switch
is
normally
channel)
activates
the
Call
cir-
set
to
"off,"
which
means
you
cuit.
This
allows
the
KB-112
opera-
should
be
within
two
feet
of
the
tor
to
talk
"hands-free."
The
mic-
front
panel
when
talking
into
the
on
LED
and
the
Call
Light
both
mic
(i.e.,
during
the
Normal
and
illuminate
when
a
remote
operator
Remote
Page
modes).
turns
on
the
mic.
However,
you
should
change
the
dip
When
set
up
for
Remote
Listen-Page
switch
to
"on"
when
talking
into
the
mic
remains
on,
so
the
1B-112
the
mic
will
occur
from
a
greater
operator
can
talk
"hands-free."
The
distance,
i.e.
during
Remote
Listen
mic
and
the
mic-on
LED
are
on
until
or
Remote
Listen-Page
(when
the
another
Station
(on
the
same
chan-
operator
can
talk
hands-free).