Kenwood KR-4070 User manual

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2

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FM

STEREO

RECEIVER

KR-4070

gy

INSTRUCTION

MANUAL

the

sound

approach

to

quality

|

KENWOOD

To

INTRODUCTION

The

purpose

of

this

manual

is

to

acquaint

you

with

the

operating

features

of

your

new

receiver.

You

will

notice

that

in

every

detail

of

planning,

engineering,

styling,

operating

con-

venience,

and

adaptability,

we

have

sought

to

an-

ticipate

your

needs

and

desires.

We

suggest

that

you

read

this

manual

carefully.

Knowing

how

to

set

up

your

receiver,

to

the

best

advantage,

will

enhance

your

listening

pleasure

right

from

the

start.

You

will

also

become

aware

of

the

ease

with

which

you

can

adjust

your

receiver

to

meet

your

special

re-

quirements.

SERIAL

NUMBER

Record

your

SERIAL

NUMBER

on

the

spaces

designated

on

the

warranty

card.

You

will

find

the

serial

number

on

the

back

of

the

unit.

AFTER

UNPACKING

After

unpacking,

we

recommend

you

inspect

and

examine

the

unit

for

any

possible

shipping

damage.

If

your

unit

is

damaged

or

fails

to

operate,

notify

your

dealer

immediately.

If

your

unit

was

shipped

to

you

directly,

notify

the

shipping

company

without

delay.

Only

the

consignee

(the

person

or

company

receiving

the

unit)

can

file

a

claim

against

the

carrier

for

shipping

damage.

We

recommend

you

retain

the

original

carton

and

packing

materials

to

prevent

any

damage

should

you

transport

or

ship

your

unit

in

the

future.

PRECAUTIONS

ON

INSTALLATION

a)

Avoid

locations

subject

to

direct

sunlight.

b)

Avoid

high

or

low

temperature

extremes.

c)

Keep

the

unit

away

from

heat

radiating

source

and

magnetism

generating

source.

d)

Choose

locations

with

as

little

vibration

and

dust

as

possible.

WARNING:

TO

PREVENT

FIRE

OR

SHOCK

HAZARD,

DO

NOT

EXPOSE

THIS

APPLIANCE

TO

RAIN

OR

MOIS-

TURE.

2

KR-40701K}

IMPORTANT!

1.

Units

shipped

to

U.S.A.

and

Canada

are

designed

to

operate

on

120

volts

AC

only

and

are

not

equipped

with

an

AC

Voltage

*

Selector

Switch.

Therefore,

the

following

©

:

description

on

sucha

switch

should

be

:

disregarded.

..

: :

‘

2.

Units

shipped

to

all

other

countries

are

Q

equipped

with

an

AC

Voltage

Selector

~

Switch

on

the

rear

panel.

The

following

;

description

on

this

switch,

“AC

Voltage

<

Selection”,

should

be

carefully

read.

;

AC

VOLTAGE

SELECTION

This

unit

operates

on

120

volts,

220

volts

or

240

volts

AC.

The

AC

Voltage

Selector

Switch

is

set

to

the

voltage

generally

available

in

the

country

where

the

unit

is

shipped.

It

is

important

to

make

sure,

before

connecting

the

power

cord

to

your

AC

outlet,

whether

the

setting

position

of

this

switch

corresponds

to

your

voltage.

If

not,

it

must

be

changed

to

the

proper

setting

in

accordance

with

the

direction

below.

NOTE:

Our

warranty

does

not

cover

damage

caused

by

excessive

line

voltage

due

to

improper

setting

of

the

AC

Voltage

Selector

Switch.

Stopper

plate

Screw

@

|

Lever

i)

i)

AC

120V~

C}

C)

Position

AC

220V~

Position

AC

240V~

Position

)

@

©

1.

Remove

screw

and

stopper

plate

2.

Slide

lever

to

your

line

voltage.

3.

Lock

lever

with

stopper

plate

and

screw.

AC

VOLTAGE

SELECTOR

SWITCH

5

CONTENTS

CONNECTING

INSTRUCTIONS

000...

cece

eeteeeteeetteeneees

6

OPERATING

INSTRUCTIONS...

cece

cet

eter

ttetereaeeens

10

POINTS

TO

BE

CHECKED

PRIOR

TO

SERVICING

........

eee

12

SPECIFICATIONS

ooo...

cee

cece

ect

eeeeetenceete

te

tttettteetenas

12

FEATURES

Low

noise

cascade

junction

type

FET

and

frequency

linear

type

precision

3-ganged

var-

iable

capacitor

are

empioyed

in

the

FM

front

end.

These

are

followed

by

high

selective

IF

section

and

phase

locked

loop

system

IC

in

the

MPX

circuits.

These

highly

retiable

elements

will

give

you

stable

FM

reception.

.

AM

section

is

equipped

with

high

selectivity

ceramic

filter

and

high

performance

dual-in-

line

type

IC.

This

will

promise

you

optimum

reception.

Employs

large

size

of

signal

and

tuning

meters.

,

Employs

large

size

of

dial

stroke

of

10-5/8”

{270

mm).

Equipped

with

convenient

muting

circuit

which

automatically

silences

interstation

noise.

40

watts

per

channel,

minimum

RMS

at

8

ohms,

from

20

Hz

to

20

kHz

with

no

more

than

0.1%

total

harmonic

distortion.

7.

10.

11.

12.

13.

Power

amplifier

section

employs

differential

amplifier

with

high

stability

and

low

distortion

in

first

and

second

stages,

and,

di-

rect

coupled

circuit,

in

all

stages.

Adoption

of

the

Kenwood

ASO

(area

of

safe

operation)

detection

limiter

system

for

the

protection

circuit

which

protects

power

tran-

sistor.

Pre-amplifier

is

equipped

with

operational

IC

amplifier

of

single-in-line

type,

and

this

will

assure

you

low

noise,

low

distortion

and

increase

of

dynamic

range.

Devised

to

improve

stability

in

power

source

and

sound

quality

by

employing

two

electro-

lytic

capacitors

of

7500uF.

Decreased

wires

thanks

to

a

large-sized

printed

circuit

board.

Two

pairs

of

speakers

can

be

used.

Equipped

with

a

massive

heat

sink.

kR-4070(K)

3.

OUTDOOR

FM

ANTENNA

When

a

75

ohm

antenna

is

used

for

connecting

to

the

antenna

terminals,

the

300

ohm

terminals

should

not

be

used,

and

conversely.

INTERCONNECTING

DIAGRAM

752

coaxial

cable

T-TYPE

FM

ANTENNA

AM

FERRITE

BAR

ANTENNA

See

page

9.

y

Prono

“us

INPUT

——TAPE——

PLAY

REC/PLAY

REC

aR)

obi

TO

AM

OUTDOOR

ANTENNA

TURNTABLE

4

—

KR-4070(k)

OIN

cord

as

=.

7

fieees

attOe'

58

TAPE

DECK

TO

AC

OUTLET

Leh

Rch

Lch

Rech

SPEAKER

SYSTEMS

A

SPEAKER

SYSTEMS

B

CONTROLS

AND

THEIR

FUNCTIONS

@KENWOCIO

am-em

evened!

necever

(aria

=

Power

SPEAKER

®

POWER/PHONES/SPEAKERS

switch

A

combined

switch

for

power,

headphones

and

speaker

selection.

POWER

OFF........

Receiver

off.

PHONES

..............

Speakers

cut

off

(headphones

can

be

used).

POETS

To

listen

to

speakers

connected

to

the

SPEAKERS

A

terminals.

Ee

To

listen

to

speakers

connected

to

the

SPEAKERS

B

terminals.

AB

ie

To

listen

simultaneously

to

speakers

connected

to

the

A

and

B

SPEAKERS

terminals.

@

PHONES

jack

Insert

a

stereo

headphone

plug

into

this

jack

for

private

listening.

The

speakers

are

silenced

when

the

SPEAKERS

switch

is

set

to

PHONES

position.

@

BASS

and

TREBLE

controls

BASS

control

.......

Turning

it

clockwise

increases

low

fre-

quencies

and

counterclockwise

decreases

it.

TREBLE

control....

Turning

it

clockwise

increases

high

frequencies

and

counterclockwise

decreases

it.

@

BALANCE

control

This

contro}

adjusts

unequal

volume

from

any

program

source

in

right

and

left

channels.

The

left

channel

is

accentuated

when

this

control

is

turned

from

center

toward

the

left

side,

and

conversely.

@

VOLUME

control

This

control

adjusts

simultaneously

volumes

in

both

chan-

nels

{right

and

teft).

Set

it

to

your

own

most

satisfactory

listening

tevel.

©

LOUDNESS

switch

This

switch

boosts

bass

and

treble

tones

at

low

listening

levels.

Our

ears

have

less

sensitivity

to

low

and

high

frequencies

at

tow

listening

levels

and

this

switch

compensates

for

this

deficiency.

This

switch

should

be

off

when

listening

at

normal

and

high

levels.

@)

TAPE

switch

Depress

this

switch

when

using

a

tape

deck

for

tape

playback,

or

when

monitoring

a

tape

during

recording.

NOTE:

Except

for

tape

playback,

make

sure

it

is

in

the

“SOURCE”

position.

SELECTOR

switch

Switch

positions

and

functions

are

as

follows:

AM...

ee

To

receive

AM

broadcast.

AUTO/MUTING

...

To

receive

both

FM

mono

and

stereo

broadcasts.

Automatic

switching

operates

between

FM

mono

and

stereo

broadcast.

This

position

also

silences

the

interstation

noise

on

the

FM

band.

.

To

receive

FM

mono

broadcast.

.

To

operate

a

turntable

connected

to

the

PHONO

jacks.

To

select

source

connected

to

the

AUX

jacks.

@

TUNING

knob

Select

the

desired

AM

or

FM

station

while

observing

the

SIGNAL

and/or

TUNING

meters

for

optimum

tuning.

FM

STEREO

indicator

With

the

SELECTOR

switch

set

to

AUTO/MUTING

position.

the

STEREO

indicator

lights

during

an

FM

stereo

broadcast

reception.

However,

it

does

not

light

during

an

FM

mono

broadcast

reception.

@@

TUNING

meter

This

meter

is

used

for

precise

tuning

to

the

center

of

an

FM

channel.

Turn

the

tuning

knob

until

the

meter

pointer

is

in

the

center

of

the

meter

scale.

This

provides

maximum

separation

and

minimum

distortion.

()

SIGNAL

meter

This

meter

indicates

signal

strength

for

AM

and FM.

Maximum

deflection

indicates

best

receiving

condition.

KR-4070(K)

5

CONNECTING

SPEAKER

CONNECTION

In

connecting

only

one

pair

of

speakers,

con-

nect

the

right

speaker

to

[R]

and

the

left

speaker

to

[L|

of

the

SPEAKERS

A

terminals.

Should

(+)

or

(—)

of

either

right

or

left

channel

be

reversely

connected,

sounds

at

the

center

section

will

be

adversely

affected

by

the

lack

of

separation.

To

connect

an

additional

pair

of

speakers,

connect

the

right

speaker

to

[R]

and

the

left

speaker

to

of

the

SPEAKERS

B

terminals.

Sound

cannot

be

heard

when

the

SPEAK-

ERS

switch

on

the

front

panel

is

set

to

the

A+B

position

and

only

one

pair

of

speakers

(connected

to

either

SPEAKERS

A

terminals

or

B

ones)

are

used.

This

is

because

A

and

B

speaker

circuits

are

in

series

and

is

not

an

indication

of

any

trouble.

When

connecting

the

speaker

leads

to

the

speaker

terminals,

make

sure

that

the

bare

wires

at

the

tips

of

the

speaker

leads

do

not

touch

the

adjacent

terminal.

{t

is

recommended

that

the

wires

of

individual

speaker

lead

tips

are

soldered

or

they

are

stranded

together

to

eliminate

any

possibility

of

short-circuits

forming

in

the

speaker

connecting

network.

INSTRUCTIONS

——

10

rom

————

a

@_

Remove

insulation

from

lead

tip.

@

Strand

wire.

SPEAKER

LEAD

TIP

Insert

the

Loosen

the

screw

wire

Tighten

the

screw

NOTE:

The

impedance

of

each

speaker

should

be

4

ohms

or

more

when

only

one

pair

of

speakers

are

used

or

when

two

pairs

of

speakers

are

simultaneously

used

(A+B).

RIGHT

PHASING

OF

THE

SPEAKERS

Speaker

phasing

can

be

determined

in

the

following

manner:

1.

Set

the

SELECTOR

switch

to

FM

(MONO).

2.

Adjust

the

VOLUME

control

to

the

desired

listening

level.

3.

if

the

sound

comes

directly

from

the

front.

the

speakers

are

in

phase.

If

the

sound

comes

from

both

sides

and

there

is

a

noticeable

loss

in

low

frequencies,

the

speakers

are

out

of

phase.

In

this

case

reverse

the

leads

on

one

speaker.

Ey]

(Leet)

6

—

KR-4070{K)

CONNECTING

TURNTABLE

CONNECTION

The

two

shielded

audio

cables

from

your

stereo

turntable

are

normally

terminated

with

phono

plugs.

Connect

the

left

channel

of

the

turntable

to[L]

of

the

INPUT

PHONO

jack

and

the

right

channel

to

[R!

of

the

INPUT

PHONO

jack.

If

the

turntable

has

a

grounding

wire,

con-

nect

it

to

this

unit's

GND

terminal

to

avoid

hum.

TAPE

DECK

CONNECTION

Recording

A

tape

deck

can

be

connected

for

recording

as

follows:

the

left

channel

input

of

the

tape

deck

to

of

the

TAPE

REC

jack,

the

right

channel

input

of

the

tape

deck

to

[R]

of

the

TAPE

REC

jack.

Playback

A

tape

deck

can

be

connected

for

playback

as

follows:

the

left

channel

output

of

the

tape

deck

to

of

the

TAPE

PLAY

jack,

the

right

channel

output

of

the

tape

deck

to

[R?

of

the

TAPE

PLAY

jack.

‘

DIN

CONNECTOR

(REC/PLAY

CONNECTOR)

if

your

tape

deck

is

equipped

with

a

DIN

connector,

connect

it

to

the

TAPE

REC/PLAY

connector

with

a

DIN

connecting

cord.

A

DIN

connector

enables

recording

and

playback

with

this

single

cord.

NOTES:

1)

Please

note

that

the

REC/PLAY

connector

corresponds

to

the

TAPE

REC

and

PLAY

—

the

signal

must

be

con-

trolled

with

TAPE

switch

on

the

front

panel.

,

2)

When

a

DIN

cord

is

used

for

connecting

to

the

tape

deck,

the

PLAY

and

REC

jacks

should

not

be

used.

AUX

(AUXILIARY

INPUTS)

High

level

AUX

input

jacks

are

for

mis-

cellaneous

sources,

such

as

extra

tape

decks,

TV

sound

outputs,

and

other

external

components.

INSTRUCTIONS

TURNTABLE

GND

(CINPUT

PHONO

=

AUX

Ground

wire

TAPE

DECK

AC

OUTLETS

The

AC

outlets

on

the

rear

panel

of

the

receiver

may

be

used

to

supply

power

to

other

components,

such

as

a

turntable,

tape

deck,

etc.

1.

SWITCHED

outlet

This

outlet

is

controlled

by

the

POWER

switch

on

the

front

panel.

(The

capacity

is

200

watts

maximum.)

2.

UNSWITCHED

outlet

This

outlet

delivers

power

at

all

times.

(The

capacity

is

200

watts

maximum.)

NOTES:

1}

Units

shipped

to

the

European

countries

are

not

equipped

with

the

AC

OUTLETS.

2)

Do

not

connect

any

equipment

whose

power

consump-

tion

exceeds

the

capacity

of

each

outlet.

KR-4070{K)

7

CONNECTING

FM

ANTENNA

CONNECTIONS

Since

FM

broadcast

signals

travel

along

a

straight

and

direct-line

path,

they

become

rather

weak

behind

hills

and

buildings

even

in

the

vicinity

of

a

transmitting

station.

FM

signals

also

become

weak

in

areas

distant

from

a

station

even

though

there

may

not

be

any

obstruction

to

the

direct-line

path

of

the

signal.

Therefore,

a

good

FM

antenna

should

be

installed

in

the

most

effective

manner

for

the

best

possible

FM

reception.

FM

Outdoor

Antenna

In

areas

at

a

greater

distance

from

the

transmitting

station,

the

use

of an

outdoor

antenna

is

highly

recommended.

It

is

available

in

various

types.

For

reception

of

stations

located

in

many

directions,

a

non-directional

type

antenna

will

offer

better

results.

When

using

a

directional

antenna,

always

orient

it

for

the

best

reception

of

the

desired

station.

The

correct

position

will

be

indicated

by

maximum

deflection

of

the

SIGNAL

meter

on

the

unit.

Connections

should

be

made

as

indicated

by

figures.

Keep

FM

antennas

away

from

roads

to

avoid

noises

made

by

the

ignition

of

car,

motorcycle,

etc.

NOTE;

Consult

audio

dealer

for

detailed

information

of

FM

outdoor

antenna

installation.

T-type

Antenna

In

areas

close

to

the

transmitting

station,

a

simple

T-type

antenna

may

suffice.

It

should

be

remembered,

however,

that

the

pickup

of

reflections

(similar

to

“ghosts”

on

TV)

will

result

in

poor

stereo

reception.

These

reflections

must

therefore

be

reduced

to

a

minimum,

either

by

careful

orientation

of

the

indoor

T-type

antenna

or,

if

this

will

not

eliminate

them,

by

using

a

more

directional

outdoor

type

antenna.

Spread

the

2

arms

of

the

antenna

horizontal-

ly

and

while

listening

to

an

FM

station,

position

them

for

the

best

reception.

The

antenna

can

then

be

taped

to

a

wall

or

ceiling.

8

—

kR-4070(K)

INSTRUCTIONS

752,

coaxial

cable

NTENNAY

ANTENNA

FM

seen

|

zg

t

----+-6

©

GND

AM

XN

-

CONNECTING

AM

ANTENNA

CONNECTION

Normally,

position

the

ferrite

bar

antenna

for

best

reception

while

listening

to

an

AM

station

as

described

on

page

10.

AM

Indoor

Antenna

The

ferrite

bar

antenna

employed

on

the

rear

panel

assures

optimum

AM

reception.

AM

Outdoor

Antenna

In

fringe

areas

or

in

locations

surrounded

by

steel

frame

buildings

where

satisfactory

reception

cannot

be

obtained

with

the

ferrite

bar

antenna,

an

AM

outdoor

antenna

should

be

connected

to

the

AM

terminal.

GROUND

It

is

advisable

to

connect

the

GND

terminal

on

the

rear

panei

to

the

ground

by

using

a

buried

grounding

rod

or

iron-made

water

pipe

to

reduce

the

noise

and

ensure

safety.

However,

never

use

a

gas

pipe

for

this

purpose.

DIN-TYPE

ANTENNA

JACKS

Units

shipped

to

European

countries

are

equipped

with

the

DIN-type

antenna

jacks

on

the

rear

panel.

NOTE:

Consult

audio

dealer

for

detailed

information

on

making

con-

nections.

INSTRUCTIONS

Keep

the

AM

ferrite

bar

antenna

away

from

the

rear

panel.

AM

ANTENNA

SETTING

ANTENNA

GND

Ground

wire

ROUND

TO

OUTDOOR

AM

ANTENNA

To

KR-4070

DIN-type

feeder

antenna

jacks

separator

coaxial

cable

To

DIN

antenna

outlet

DIN-TYPE

ANTENNA

CONNECTOR

PRECAUTIONS

FOR

SAFETY

@

Switch

off

the

unit

and

disconnect

the

power

plug

from

your

AC

outlet

immediately

if

the

abnormality

(smell,

smoke,

etc.)

should

take

place.

@

When

you

connect

or

disconnect

the

power

plug

from

your

AC

outlet,

never

do

it

with

wet

hands

to

avoid

unexpected

accident

from

electric

shock.

Besides.

do

it

by

holding

the

power

plug

itself.

@

Disconnect

the

power

plug

from

your

AC

outlet

when

it

begins

to

thunder

terrifically.

Aliso.

it

is

safe

to

disconnect

the

antenna

feeder

{or

coaxial

cable)

from

the

unit

if

an

outdoor

antenna

is

installed.

Do

not

touch

the

antenna

feeder

{or

coaxial

cable)

discon-

nected

then.

@

It

is

desirable

to

disconnect

the

power

plug

from

your

AC

outlet

when

you

leave

your

house

for

a

long

time.

@

The

power

cord

must

not

be

pulled

strongly.

nor

bent

@

Do

not

put

a

heavy

thing

on

the

power

cord.

@

Do

not

put

on

and

near

the

unit

what

contains

water

@

Do

not

put

in

the

unit

the

inflammable

(paper,

cellu-

@

Never

dismantte

the

case

from

the

unit

and

touch

the

*

*

*

forcibly,

nor

scratched,

nor

extended

by

connecting

an

extra

cord.

This

will

damage

the

cord

and

be

a

cause

of

electric

shock

and

a

fire.

* *

*

(vase.

etc.).

loid,

etc.)

and

the

metal

(needle.

hairpin,

coin,

etc.).

* * *

internal

part.

Never

modify

the

internal

part.

Otherwise,

the

danger

of

electric

shock

will

be

in-

curred.

KR-4070iK)

9

OPERATING

INSTRUCTIONS

Prior

to

turning

on

the

unit,

set

each

control

and

switch

as

below.

e

TAPE

“SOURCE”

e

LOUDNESS

“OFF”

e

VOLUME

“MIN”

e

BALANCE

Center

Position

e

TREBLE

Center

Position

e

BASS

Center

Position

accordance

with

the

item

to

be

operated.

Next,

turn

on

the

unit

and

set

the

SPEAKERS

switch

to

“PHONES”,

“A”,

“B”

or

“A+B”

in

FM

RECEPTION

1.

Set

the

SELECTOR

switch

to

FM

AUTO

MUTING.

2.

Turn

the

TUNING

knob

to

select

your

sta-

tion.

Best

reception

is

obtained

when

the

TUNING

meter

pointer

is

exactly

in

the

center

and

the

SIGNAL

meter

pointer

deflects

to

the

extreme

right.

TUNING

FM

Reception

3.

Adjust

volume

and

tone

quality.

°

NOTE:

It

may

be

impossible

to

eliminate

noise

from

an

FM

stereo

broadcast

if

the

signal

is

extremely

weak.

In

such

a

case

the

relative

signal

strength

can

be

improved

by

setting

the

SELECTOR

switch

to

FM

MONO.

While

the

stereo

effect

will

be

lost,

a

great

deal

of

the

noise

can

be

substantially

eliminated.

10

=

KR-40701K)

AM

RECEPTION

=

Set

the

SELECTOR

switch

to

AM.

2.

Turn

the

TUNING

knob

to

select

your

sta-

tion.

Best

reception

is

obtained

when

the

SIGNAL

meter

pointer

deflects

to

the

ex-

treme

right.

AM

Reception

3.

Adjust

volume

and

tone

quality.

TURNTABLE

OPERATION

1.

Set

the

SELECTOR

switch

to

PHONO.

2.

Operate

the

turntable.

3.

Adjust

volume

and

tone

quality.

AUX

JACKS

UTILIZATION

To

play

component

connected

to.

the

AUX

jacks,

proceed

as

follows:

1.

Set

the

SELECTOR

switch

to

AUX.

2.

Operate

the

component

connected.

3.

Adjust

volume

and

tone

quality.