Harman Kardon A402 Owners Manual - Page 6

DISPLAY

SENSITIVITY

The

Sensitivity

Display

is

comprised

of

a

light

-emitting

diode

display

and

four

pushbutton

switches

that

select

mode

of

operation.

The

LED

display

is

a

faster,

more

responsive

and,

therefore,

more

accurate

indication

of

dynamic

range

and

power

level.

The

ranges

for

the

display

are

established

by

pushbutton

switches

1

and

2

under

the

display.

Once

the

range

is

establ

ished

the

dB

level

of

the

signal

below

full

scale

is

indicated

by

the

calibration

on

the

LED

panel.

For

example,

if

pushbutton

1

is

depressed,

which

is

40

watts

full

scale,

the

first

green

lamp

wil

l

come

on

at

30

dB

below

40

watts,

the

second

green

lamp

at

24

dB

below

40

watts,

etc.

The

top

red

lamp

will

glow

at

40

watts

output.

do

•

•

•••<,

•

if

the

display

is

to

be

inhibited

depress

the

OFF

pushbutton.

••••

,

v•z•••••

•

•

•

Pushbutton

2

represents

6

watts

full

scale.

Pt

shbutton

1

represents

40

watts

ful

l

scale,

that

is

the

0

dB

LED

will

light

at

40

watts

output.

OTHER

CONTROLS

By

far

the

most

frequently

used

con-

trols

are

FUNCTION,

VOLUME

and

POWER;

but

each

of

the

controls

we

haven't

yet

mentioned

has

a

specific

purpose.

Listen

to

their

effect

as

we

describe

them.

PHONES

1

and

2.

Headphones

may

be

connected.

Insertion

of

headphone

connector

WILL

NOT

automatically

defeat

speaker

systems.

Headphones

can

therefore

be

used

whether

your

speakers

are

"on"

or

"off!"

CONTOUR.

Works

in

conjunction

with

VOLUME

control

to

increase

bass

energy

at

low

volume

settings

with

progres-

sively

less

effect

as

volume

level

is

increased.

The

CONTOUR

switch

has

no

effect

at

VOLUME

control

settings

beyond

12

o'clock.

DUB.

When

this

pushbutton

switch

is

released

and

TAPE

1

is

depressed

(latched

in)

allows

dubbing

(recording)

from

Tape

Recorder

1

to

Tape

Recorder

2.

When

depressed

(latched

in)

will

allow

dubbing

from

Tape

Recorder

2

to

Tape

Recorder

1.

TAPE

2.

Admits

programs

from

any

"high

level"

source

(usually

tape

re-

corder)

connected

to

TAPE

INPUT

2

receptacle.

DOES

NOT

affect

signal

The

following

table

shows

the

amount

of

power

required

into

an

8

-ohm

load

to

light

each

LED

for

the

40

watt

and

6

watt

scales.

dB

Range

1

(watts)

Range

2

(watts)

0

40

6

-3

20

3

-6

10

1.5

-9

5

0.750

-12

2.5

0.375

-18

0.63

0.095

-24

0.159

0.024

-30

0.040

0.006

To

test

if

all

the

lamps

are

opera-

tive

press

the

TEST

pushbutton.

appearing

at

the

TAPE

OUTPUT

1

re-

ceptacle

2.

Thus,

the

use

of

the

TAPE

INPUT

switch

does

not

disturb

the

recording

process

of

whatever

source

the

FUNCTION

switch

is

set.

(Note:

If

the

rear

panel

TAPE

INPUT

2

is

unoc-

cupied

and

TAPE

2

switch

is

depressed,

no

sound

wi

ll

be

heard

regardless

of

the

position

of

the

FUNCTION

switch.

The

same

will

be

true

if

the

equipment

con-

nected

to

the

TAPE

INPUT

2

is

off.)

TAPE

1.

Same

as

Tape

2,

except

applies

to

TAPE

I

N

PUT

1.

TAPE

IN/OUT.

These

are

stereo

phone

jack

connected

in

parallel

with

TAPE

INPUT

1

and

TAPE

OUTPUT

1.

They

provide

a

convenient

method

of

con-

nection

for

tape

recording

and

playback.

HINGE

400Hz/200Hz.

Bass

control

effect

will

be

more

pronounced

when

pushbutton

is

out

(400Hz);

it

will

be

less

pronounced

when

pushbutton

is

in

(200Hz).

HI

NGE

5kHz/10kHz.

Treble

control

effect

will

be

more

pronounced

when

pushbutton

is

in

(10kHz),

and

less

pro-

nounced

when

pushbutton

is

out

(5kHz).

LO

FILTER.

Rumble

from

your

turn-

table

(if

present)

or

other

low

frequency

problems

can

be

effectively

reduced

with

this

switch.

HI

FILTER.

A

filter

to

reduce

high

frequency

content

of

any

program

material.

Tape

hiss,

record

scratches

and

other

problems

found

in

program

material

can

be

effectively

reduced.

BASS.

Raises

(clockwise)

or

lowers

(counterclockwise)

low

frequency

content

in

program

material

on

both

channels

simultaneously.

Neutral

posi-

tion

is

12

o'clock.

TREBLE.

Same

effect

as

BASS

con-

trol,

except

works

on

high

frequencies.

Two

circuit

breakers

are

provided

to

protect

the

A402.

The

circuit

breakers

are

label

led

SPEAKER

PROTECTOR

and

protect

the

amplifier

circuitry

from

external

short

circuits

or

other

condi-

tions

that

would

cause

excessive

current

to

be

drawn

through

the

amplifiers.

If

one

of

your

speakers

stops

reproducing

sound

first

check

the

connections

for

that

speaker,

correcting

any

short

circuit

condition.

(Wire

strands

touching

the

wrong

terminal

are

the

usual

cause.)

Then

locate

the

circuit

breaker

for

that

channel

.

Press

the

reset

button

firmly

and

release

immediately.

DO

NOT

hold

button

in.

Harman Kardon A402 Owners Manual - Page 6

Display, Sensitivity

Page 6 highlights