Clear-Com RM-120A Manuel de service télécharger pdf (Page 24)

the

operator

is

monitoring.

Program

buss

for

sending

onto

the

inter-

com

lines,

and

to

the

station's

headset

Each

channel's

SIDETONE

NULL

adjustment

and

speaker

amplifiers.

Program

feed

to

(this

is

located

behind

the

unmarked

each

intercom

line

is

controlled

by

hole,

15,

beside

each

Talk

toggle

individual

trimpots

(18)

behind

the

ac-

switch)

is

set

at

the

factory

for

best

cess

plate.

The

trimpots

are

set

fully

(full)

null

with

less

than

500

feet

of

OFF

at

the

factory.

The

program

level

connected

cable.

Because

of

the

con-

heard

in

the

station's

headset/speaker

trolled

amount

of

added

sidetone,

the

is

set

by

the

front

panel

PROGRAM

VOLUME

number

of

channels

being

monitored

control

(19).

doesn't

have

much

effect

on

the

overall

sidetone

level.

Call

Signalling

Pressing

the

CALL

button

(20)

causes

the

When

you

are

using

a

gooseneck

mic

while

visual

signalling

voltage

to

be

sent

the

speaker

is

on,

it's

usually

necessa-

onto

the

intercom

lines

of

only

those

ry

to

turn

the

sidetone

control

all

the

channels

whose

Intercom

Select

buttons

way

down

(counter-clockwise)

to

prevent

are

engaged.

This

voltage

is

sensed

by

acoustic

feedback.

The

dipper

circuit,

all

stations

on

those

channels

(inclu-

which

is

enabled

in

all

speaker

stations

ding

the

sending

station),

which

cause

with

gooseneck

mics,

also

helps

prevent

the

corresponding

CALL

LAMPS

(21)

to

feedback.

It

automatically

attentuates

light

brightly.

A

signal

from

another

the

station's

speaker

output

when

any

of

station

is

indicated

in

the

same

manner,

the

Talk

toggle

switches

are

in

the

whether

or

not

the

Intercom

Select

but-

momentary

ON

position.

ton

is

engaged.

Termination

Power

The

termination

switches

(16)

are

set

The

power

switch

(23)

controls

the

AC

only

during

installation,

and

must

NOT

power

to

the

station;

an

integral

neon

be

changed

unless

a

change

in

system

bulb

indicates

when

the

unit

is

on.

The

wiring

requires

it.

circuit

breaker

(24)

protects

against

DC

power

shorts.

Any

current

load

greater

Program

Input

than

two

amperes

will

cause

it

to

trip,

The

MS-400A

has

Clear-Com's

new

switcha-

causing

the

short

indicator

(25)

to

ble

mic-level

or

line-level

Program

light.

After

removing

the

short,

pres-

(auxiliary)

preamp.

A

switch

located

on

sing

the

breaker

button

instantly

re-

the

rear

panel

(17)

sets

the

circuit's

stores

normal

operation.

input

sensitivity

so

that

either

a

mic

(-SOdBv)

or

line

(-OdBv)

level

signal

The

AC

line

voltage

select

switch

(26)

will

produce

full

station

output.

The

and

external

line

fuse

(27)

permit

in-

input,

accessed

from

a

rear

panel

3-pin

stant

change

in

the

field

between

115

XLR

connector

(22),

is

balanced,

but

may

and

230

VAC

operation.

Be

certain

to

be

used

single-ended

if

you

tie

one

of

use

the

correct

slow

blow

fuse

(115VAC

=

the

inputs

to

circuit

common.

Program

IA;

230V

=

0.5A).

audio

from

the

preamp

feeds

both

the

22

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