Service manual
At the
factory,
Clear-Com
sets
the
internal
sidetone
null
to
the
best
overall
null
with
500
feet
of
cable.
If
the
sidetone
is
not
nulled
enough, feedback
may
occur
between
the
speaker
and
the
mic.
To
adjust
the
internal
sidetone
null:
1)
remove
top
cover
of
unit
2)
plug
in
headset
and
turn on
mic
(or
activate
gooseneck
mic)
3)
turn
up
Headset
Volume
4)
talk
into
mic
while
slowly
turning
sidetone
adjustment
clockwise.
Find
the
null
point
where
you
can
barely hear
yourself.
This
is
the
proper
setting
for
minimum
feedback
when
using
both
the
speaker
and
a
mic.
Adjust individually
for
each channel.
Program
Volume
Speaker
Volume
Headset
Volume
These
knobs adjust
listen-levels
of
the
auxiliary program
and
overall
intercom
activity,
as
heard
in the
speaker
and
headphones.
Stage
Announce
This
push-button
activates
the
feature
designed
for
paging
appli-
cations.
The
RM-120A
provides
a
balanced,
line-level
output
signal
to
a
1/4" phone
jack
on
its
rear panel.
The
Stage
Announce
button
acti-
vates
this
output,
giving
the
operator
access (via
headset
or
gooseneck
mic)
to
the
external
speaker/amp
system.
Pressing
Stage
Announce
also
mutes
the
operator's voice
to
the
intercom
channels.
Vic
On/Off/(On)
This
3-position
toggle
switch
turns
the
mic on
or
off
in
your
carbon)
and
dynamic
headse
or
the
gooseneck
iic.
With-the-switch
set
to
the
top
"on"
position,
the
mic
stays
on.
When
in
the
middle
position,
the
mic
is
off. The
bottom
position
"(on)"
is
a
momentary
setting.
PROGRAM
INPUT
3-pin
female
XLR
connector;
pin-out assignment
is:
Pin 1--ground
Pin
2--input
Pin
3--input
The
auxiliary
program
input
is
on
the
RM-120A
rear
panel.
It
accepts
a
balanced,
line-level
input (input
impedance
is
10k
ohms
bridging;
a
0
dBv nominal
signal
drives
the
headset
to
full
output).
The
RM-120A
operator
can
monitor program
along
with intercom
activity
in
the
head-
set/speaker.
A
split-feed option,
set
up
at
the
Clear-Com
factory,
separates
the
intercom
and
program
signals
for
use
with
a
binaural
(6-
pin, stereo)
dynamic
headset.
STAGE
ANNOUNCE
OUTPUT
1/4"
phone
jack;
3-circuit (ring/tip/sleeve);
600
ohms
output impedance.
EXTERNAL
SPEAKER
OUTPUT
1/4"
phone
jack;
2-circuit (internally-switched;
ring/tip);
discon-
nects
internal
speaker;
output
for
speaker
with
impedance
of
8
ohms
or
more (preferably
16
ohms).
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