Clear-Com KB-111A Troubleshooting guide

KB-111A

Speaker Station

INSTRUCTION

and

SERVICE MANUAL

III~I~

Clear-Co.

~I'

Intercom Systems

945 Camelia St. Berkeley, California 94710 510-527-6666

Clear-Com 810026 8/15/88

REV.

•

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DOCUMENTATION

ADDENDUM

KB-ll1A

MANUAL

• .f REV. A .•

November

17,

1987

I .1 r •

MIC

LINE

GAIN

LEVEL

INCREASE

effecting

4dB

Mic

Line

Increase

gaIn

level,

the

following

changes

have

been

made:

Change:

270K

OHM

R18, 36 390K

OHM

27pf

C9 lSpf

180pf

CI0

100pf

CLEAR-COM

KB-IIIA

SPEAKER

STATION

INSTRUCTION

SERVICE

MANUAL

TABLE

CONTENTS

Section

Page

Introduction

the

KB-IIIA

•.•....•..••...•.•

Headsets

and

Mics

•..•...•.........••..•••.•••

III

Installation

.•.....••.•••••.•••••••..••••••••

Operating

Controls.·

•••..••.•.••.••..•••••••.

Parts

Listing

••..•.•..•.•••••.•.•.....•••••.•

Specifications

•...•.•.........••••.•.••.•••••

VII

Call

Signalling

Modification.·

••••••....•••••

Illustrations

Headset

Y-Cable

.•.•.•••••••.••.•.•.••••

Figure

Headset

Extension

Cord.··

•••••.•.••••••

Figure

KB-IIIA

Mounting

Dimensions

••..•••.••••

Figure

KB-IIIA

Block

Diagram

•.••.••••••••.••••

Figure

Two-Channel

Interconnect

Wiring

•.••••••

Figure

Portable

Unit

Connections

•.•.•••.••••••

Figure

Alternative

Signalling

•..•••.••••••••••

Figure

KB-IIIA

Schematic

••••.•••••••••••••••.

NOTICE:

-lihiltt

Clttar-CDIII

.a1c.tt.s

"very

attlt.pt

.a/nt.ln

Ch"

.ccur.cl/

III

thlt

In/ormation

contained

It.s

product

••

nua/a. chit

inlor.atlon

.ubJllct

change

Nithout

notice:"

•

INTRODUCTION

THE

KB-IIIA

REMOTE

STATION

The

Clear-Com

KB-lllA

Remote

Speaker

Station

that

provides

talk/

listen

communications

one

two

channels

within

our

closed-circuit

intercom

system.

features

wide

frequency

response,

high

out-

put

speaker

and

the

ability

operate

with

carbon

headset

dynamic

headset,

handset,

push-

to-talk

mic.

The

KB-IllA

features

the

Clear-Com

contoured

frequency

response

for

consistently

excellent

speech

in-

telligibility

all

surroundings.

The

speaker

delivers

crisp

sound

pressure

levels,

clearly

audible

high-

low-noise

environments.

The

Remote

Station

features

Automa-

tic

Headset

Detection;

its

built-in

mic

preamp

automatically

shuts

off

when

the

headset

disconnected,

eliminating

noise

pick-up

the

intercom

line.

The

intercom

cir-

cuitry

incorporates

mic

limiter,

which

assures

constant

talk

levels

~nd

prevents

overload.

The

KB-lllA's

speaker

can

remain

all

times,

you

can

turn

off

that

private

conversations

may

carried

out

with

headset

telephone

handset

The

three-

position

mic

switch

allows

you

to:

keep

the

mic

all

times;

activate

the

mic

momentarily;

switch

off

the

mic

the

KB-

lIlA

can

function

"listen-

only"

station.

II.

HEADSETS

AND

MICS

provide

you

with

the

ability

talk

the

intercom

channel,

the

KB-lllA

contains:

--one

1/4"

phone

jack

for

stan-

dard

carbon

headset,

AND

--one

4-pin,

male,

XLR-type

connec-

tor

(D4M)

for

dynamic

headset,

telephone-style

handset,

push-

to-talk

mic

The

KB-lllA

provides

adjustable

sidetone

circuit

which

allows

you

vary

the

level

your

voice

you

hear

your

headset

speaker.

The

circuit

also

prevents

feedback

when

using

the

speaker

and

mic

simultaneously.

You

need

only

adjust

the

sidetone

once,

even

other

Stations

subsequently

join

leave

the

intercom

system.

Designed

for

custom-mounting,

the

KB-lllA

built

charcoal-

brown,

aluminum

panel,

5/32"

thick,

that

can

installed

cut-out

any

convenient

surface,

moun-

ted

inside

Nema

electri-

cal

enclosure.

The

Station

connects

the

intercom

system

via

terminal

block

behind

the

front

panel.

Clear-Com

offers

the

"P"

Box,

which

allows

you

convert

the

KB-lllA

portable

Remote

Station.

The

P-Box

is-a

sturdy,

sloped-front,

steel

enclosure

with

solid

walnut

sides.

When

installed

P-Box,

the

KB-lllA

connects

the

inter-

com

system

with

3-pin,

XLR

connec-

tors·

~fuen

the

KB-lllA

installed

the

P-Box,

provides

talk/listen

capability

one

channel.

Standard

two-conductor

shielded

mic

cable

interconnects

stations

within

the

intercom

system.

The

KB-lllA's

built-in

headset/

speaker

amplifier

can

drive

stan-

dard

headset

levels

greater

than

110

SPL.

The

Station's

mic

preamp

automatically

shuts

off

when

the

headset

disconnected,

there-

eliminating

hum

pick-up.

NOTE:

you

use

carbon

headset

and

dynamic

headset

simultaneous-

the

listen-level

the

carbon

headset

drops

audibly-

The

carbon

headset

connections

are:

Ring--

Headphone

Tip--

Mic

Sleeve--

Ground

The

D4M

connector

pins

are:

Mic

Ground

Mic

Hot

Headphone

Ground

Headphone

Hot

assure

proper

level

and

perfor-

mance,

the

dynamic

headset

should

have

the

following

characteristics:

Microphone

type:

dynamic

Impedance

150-250

ohms

Output

level:

-55

Headphone

type:

dynamic

Output

impedance:

300-2000

ohms

Clear-Com

offers

three

dynamic

headsets,

all

with

boom-mounted,

noise-cancelling

mics.

Model

CC-

240B

double-muff

and

Model

CC-

75B

Single-muff;

both

have

boom-

activated

mics

with

on/off

swit-

ches.

Model

PH-7

very

rugged,

double-muff,

high-fidelity

headset

with

wider

frequency

response

and

greater

isolation

from

ambient

noise.

Clear-Com

also

offers

Model

HS-6,

telephone-style

handset

with

dynamic

mic

and

push-to-talk

switch;

interchangeable

with

the

above

headsets.

All

units

have

field-replaceable

cords.

The

KB-111A

drives

two

dynamic

headsets

with

only

slight

dB)

reduction

level.

Clear-Com

can

supply

you

with

Model

YC-100

"y"

Cable,

which

allows

you

plug

two

headsets

into

the

one

D4M

connector

the

Station's

front

panel.

Alternately,

you

may

construct

your

own

Y-cable;

recommend

you

use

Belden

8416

the

equivalent

(2-

conductor,

gauge)

Belden

8734

the

eqivalent

(3-conductor,

gauge).

See

Figure

You

can

also

build

extension

cord

for

dynamic

headset,

using

the

cable

specified

above.

Limit

its

length

feet

less;

greater

lengths

lead

possible

capacity

coupling

between

the

mic

signal

and

the

headset

Signal,

which

causes

oscillation

loss

frequency

response.

See

Fig.

FIGURE 1: HEADSET

"Y"

CABLE

CONNECTIONS

SHI'EL

DEO

A4M

MIC GROUND

PIN 2: MtC HOT

PIN J : HEADPHONE

GROUND

PI" 4: HEADPHONE HOT

FIGURE 2: HEADSETEXTENSION CORD

I S'

LES

~------~~------~

A4F

>---'T--

----------

---I-

A4M

SHI

DED PA LA

PIN 1: MIC GROUND CAUTION:

:x)

NOT

CONNEC"

PIN 2.:

MIC

HOT

,\l

GROUND &

EADPHo

r~E

PIN 3: HEAOPHONE GROUND GROG

ETHEA

PI"

4: HEADPHONE

HOT

A4F

SHLELDED

PAIR

A4M

CAUTION: DO

~OT

CONNECT

Mle

GROUND

HEAD

PHONE

GAO

TOGETHER

YPOI

•

II.

KB-IIIA

INSTALLATION

The

KB-111A

connects

the

inter-

com

system

with

five-screw

termi-

nal

strip,

which

located

the

Board.

Route

two-pair

(indi-

vidually

shielded)

cable

(i.e.

Bel-

den

8723)

from

Main

Station

Power

Supply

output

connector

the

location

your

Remote

Station

(or

route

two

separate,

two-conduc-

tor

mic

cables,

one

per

channel).

Each

channel

must

fed

within

its

own

shield,

although

unshielded

cable

may

used

when

run

condui

The

KB-lllA

can

mounted

cut-ou~

any

surface,

can

mount

ins~de a

Black

(electrical)

Box

(minimum

depth,

3").

See

figure

for

dimensions.

After

preparing

surface

for

in-

stallation,

bring

wiring

into

the

header

the

terminal

strip.

While

making

connections,

refer

the

lable

adjacent

the

terminal

strip;

identifies

each

assignment:

Ith

CH.

+30

Connect

the

leads

according

the

label

shown

above.

IMPORTANT

prevent

ground

loops

and

buzzes,

the

common

terminal

(pin

should

NEVER

directly

connected

chassis

ground

(pin

1).

Use

conduit

separate

wire

interconnect

two

KB-111A

Stations

you

plan

use

only

one

channel

the

KB-111A,

disable

the

Channel

Select

switch

jumping

Channels

and

together

the

connector

block,

and

hook

the

intercom

audio

line

either

terminal

you

don't

disable

the

Channel

Select

switch

and

are

only

using

one

channel,

you

must

sure

keep

the

Channel

Select

switch

set

the

active

channel.

you

switch

the

unconnected

channel,

the

Station

will

exhibit

disturbing

oscillation.

See

Figure

(page

for

examples

KB-111A

Two-Channel

Wiring.

THE

PORTABLE

KB-111A

The

KB-111A may

mounted

inside

the

Clear-Com

Model

"P"

Box,

there-

becoming

portable

Remote

Sta-

tion.

The

"P"

Box

supplied

handle,

rubber

feet,

and

screws

for

attaching

the

handle

and

the

intercom

the

enclosure.

When

the

KB-111A

mounted

the

P-Box,

only

one

channel

can

used

for

communication.

The

wiring

the

P-Box

contains

jumper

defeat

the

Station's

Channel

Select

switch.

The

portable

Station

connects

the

intercom

system

with

the

3-pin,

XLR

connectors

located

the

side

the

P-Box.

There

one

female

connector

for

input,

and

one

male

connector

for

extending

the

intercom

line

other

Remote

Stations.

Inside

the

P-Box,

the

connectors

are

wired

5-pin

terminal

strip,

which

you

plug

onto

the

header

the

KB-111A

Board.

Refer

Figure

Portable

Unit

Connections

(page

6).

--continued--

---

KB-lllA

MOUNTS

(

8.6"------~1

/[\

•

5.4

()

6"x

BACK BOX

.1"

e e

6.5"

~~~~

e e

5-"

:::>

-Y-

MINIM

..::o,j-J

\E-1.25"~

DEPTH

FIGURE 3

KB-///A

MOUNTING DIMENSIONS

KB-111A BLOCK DIAGRAM

CARBON

HEADSET

CO'

...

NEC

TO~

I •

..IC ~

DYNAM,e I

HEADSET

ONNECTOR

M'C

GA!N

(TR

)

01-

--~

CURRENT

SOURCE

UFFER

AMP

•

KB-111A FIXED INSTALLATION WIRING

(TWO-CHANNEL)

CONNECT

EARTH GROUND

NON-GROUNDED ENCLOSURE

USED 2 2-CONDUCTOR SHIELDED

PAIR

NOTE:

WIRES DO NOT FIT

STATION CONNECTOR BLOCK,

USE SEPARATE TERMINAL STRIP

JUNCTION BLOCK

CONNECT WIRES TOGETHER

KB111P5.

CDR

•

install

the

KB-lllA

P-Box:

Remove

the

plastic

screw

termi-

nal

block

from

the

header

the

KB-lllA

Board;

pull

straight

lift

block

off.

similar

terminal

block

wired

the

P-Box's

3-pin

con-

nectors;

plug

that

block

onto

the

KB-IllA's

5-pin

header.

The

terminal

block

and

the

Board

are

clearly

labelled

with

the

numbers

ensure

proper

connections-

See

Figure

Por-

table

Unit

Connection·

Because

the

P-Box

accepts

one

channel,

the

KB-IllA'

"Channel

Select"

toggle

switch

inef-

fective.

matter

which

posi-

tion

this

switch

in,

the

KB-

lIlA

operator

communicates

the

one

channel

that's

fed

into

the

P-Box

Attach

the

KB-lllA

the

front

the

P-Box,

using

the

supplied

screws

desired,

attach

the

handle

and

the

protective

rubber

feet

onto

the

suitable

sides-

The

enclosure

also

has

cut-outs

each

side

for

hanging

from

the

wall,

console,

where

ever-

Use

standard

two-conductor

mic

ca-

ble

(i.e-,

Belden

8413)

with

3-pin

connectors

interconnect

the

por-

table

station

within

the

intercom

system.

The

pin-out

assignment

for

each

XLR

connector

is:

1--

common

2--

+30

volts

3--

intercom

audio

Route

cable

from

the

Main

Station,

Power

Supply,

another

Remote

Station

the

portable

KB-IllA,

and

input

the

female

connector·

Use

the

male

output

connector

"daisy-chain"

the

intercom

line

between

the

KB-IllA

and

another

portable

Remote

Station.

diode

the

input

the

KB-

lIlA

protects

the

circuitry

against

wiring

the

interconnect

cables.

All

Remote

Stations

bridge

the

terminated

audio

line

with

approxi-

tely

15k

ohms.

-Figure 6: Portable Box Connections

Removeoriginal

lerminal block. PC

-}.,.

....

Use pl'n

num

bers

on PC Board and

terminal block lor

proper

ignmenl.

x termin

block onto

ade

rTB

POB

RCOM

bber feet INPUT (F)

PoB

: peel oN

----~r------J,

paper backing a

I & O

UTPU

ick feet onto the

-..-/

)

appropnate Side.

•

IV.

KB-IIIA

OPERATING

CONTROLS

"A/B

Chan.

Select"

This

toggle

switch

selects

the

channel

which

the

operator

will

communicate.

(This

switch

de-

feated

when

the

KB-I11A

mounted

P-Box.)

"Volume"

This

knob

adjusts

the

listen-level

for

the

speaker/headset.

"Speaker

On/Off"

This

toggle

switch

determines

the

activity

the

speaker.

''Mic

On/Off/

(On)"

This

three-position

toggle

switch

determines

the

activity

the

microphone

your

headset,

hand-

set,

gooseneck.

1>Then

the

swi

tch

set

the

top

"on"

position,

the

mic

remains

on.

When

it's

the

middle

position,

the

mic

off.

The

bottom

"(on)"

position

momentary

setting.

"Sidetone

Adj."

The

sidetone

control

enables

the

KB-111A

operator

adjust

the

level

his/her

voice

heard

the

Station's

speaker

headset,

allowing

reduction

acoustical

pick-up-

You

need

only

adjust

the

sidetone

once

(if

all),

even

other

stations

subse-

quently

join

leave

the

intercom

system.

Adjusting

the

side

tone

does

not

affect

the

level

incom-

ing

outgoing

signals.

The

side

tone

control

inside

hole

the

Volume

knob.

Use

small

blade

screwdriver

for

ad-

justment.

the

factory

Clear-Com

sets

the

sidetone

approximately

lower

than

incoming

signals.

you

want

change

this

level,

take

these

steps:

plug

headset

turn

mic

turn

volume

all

the

way

insert

screwdriver

into

hole

and

engage

the

slot

the

trimpot

inside

begin

talking

into

mic

while

slowly

turning

screwdriver;

the

volume

your

voice

will

rise

drop.

When

using

both

the

headset

and

the

speaker,

set

the

sidetone

for

maximum

null

(you

can't

hear

yourself).

"Call"

The

black

push-button

activates

the

visual

signal

circuit

that's

stan-

dard

Clear-Com

intercoms.

allows

the

intercom

user

attract

the

attention

operators

who

have

removed

their

headsets

turned

off

their

speakers.

Call

signalling

follows

the

position

the

Channel

Select

switch;

for

instance,

you

are

using

Channel

pressing

the

Call

button

activates

the

signal

circuitry

all

stations

that

are

assigned

Channel

long

you

keep

the

button

pressed,

the

Call

circuit

will

stay

active.

The

Call

button

also

activates

the

speaker

and/or

mic

any

other

Station

(on

the

same

channel)

that

set

for

remote

control.

The

amber

Call

Lamp

illuminates

when

any

Station,

the

same

chan-

nel,

activates

Call

signal.

you

need

receive

Call

sig-

nal

from

the

channel

you're

not

using,

refer

the

special

modifi-

cation

diagram

page

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