Kenwood KA-6100 User manual

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STEREO

NTEGRATED

AMPLIFIER

INSTRUCTION

MANUAL

t

V

11

the

sound

approach

to

quality

^KENWOOD

INTRODUCTION

The

purpose

of

this

manual

is

to

acquaint

you

with

the

operating

features

this

unit.

You

will

notice

that

in

every

detail

of

planning,

engineering,

styling,

operating

convenience,

and

adaptability,

we

have

sought

to

anticipate

your

needs

and

desires.

We

suggest

that

you

read

through

this

manual

carefully.

Knowing

how

to

set

up

the

unit,

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

the

unit

to

meet

your

special

requirements.

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

ship¬

ping

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

car¬

ton

and

packing

materials

to

prevent

any

damage

should

you

transport

or

ship

your

unit

in

the

future.

INSTALLATION

PRECAUTIONS

(a)

Avoid

locations

subject

to

direct

sunlight.

(b)

Avoid

high

or

low

temperature

extremes.

(c)

Keep

the

unit

away

from

heat

radiating

source.

(d)

Keep

the

unit

at

least

4

inches

(about

10

cen¬

timeters)

away

from

the

wall

and

other

things

for

ventilation.

WARNING:

TO

PREVENT

FIRE

OR

SHOCK

HAZARD,

DO

NOT

EXPOSE

THIS

APPLIANCE

TO

RAIN

OR

MOISTURE.

IMPORTANT!

1.

Units

shipped

to

U

S.A.

and

CANADA

are

designed

to

operate

on

120

volts

AC

only.

Therefore

the

above

units

are

not

equipped

with

an

AC

Voltage

Selec¬

tor

Switch

and

the

following

descrip¬

tion

on

such

a

switch

should

be

dis¬

regarded.

2.

Units

shipped

to

all

other

countries

are

equipped

with

an

AC

Voltage

Selector

Switch

on

the

rear

panel.

The

following

description

should

be

carefully

read.

AC

VOLTAGE

SELECTION

This

unit

operates

on

110

-

120

volts

or

220

-

240

volts

AC.

Before

connecting

the

power

cord

to

your

AC

outlet,

make

sure

that

the

setting

position

of

the

AC

Voltage

Selector

Switch

matches

your

AC

voltage.

If

not,

it

must

be

properly

changed

in

accordance

with

the

instructions

below.

Note:

---

Our

warranty

does

not

cover

damage

caused

by

excessive

AC

voltage

due

to

improper

setting

of

the

AC

Voltage

Selec¬

tor

Switch.

Stopper

plate

AC110

AC220

AC110

AC220

-120V

**-240V

-120V

**-240V

(AC120V~)

(AC220V-)

(AC120V~)

(AC220V-)

1.

Remove

screw

and

stopper

plate.

2.

Slide

lever

to

opposite

side.

3.

Lock

lever

by

attaching

stopper

plate

to

opposite

screw.

(

)

European

type.

AC

Voltage

Selector

Switch

2

KA-6100

(K)

FEATURES.

.

3

INTERCONNECTING

DIAGRAM

.

.

4

CONNECTING

INSTRUCTIONS.

.

5

CONTROLS

AND

FUNCTIONS.

.

6

CONTENTS

OPERATING

INSTRUCTIONS.

.

8

MAINTENANCE.

.

10

BEFORE

ASKING

SERVICE.

.

1

1

SPECIFICATIONS/BLOCK

DIAGRAM.

.

12

FEATURES

1.

LOW

DISTORTION

POWER

AMPLIFIER

SECTION

The

power

amplifier

section

is

composed

of

a

current

mirror

load

differential

amplifier,

a

class-A

amplifier,

and

an

inverted

Darlington

type

pure

complementary

circuit.

The

first

stage

is

a

transistorized

differential

amplifier

to

which

a

current

mirror

circuit

is

loaded.

The

current

mirror

circuit

increases

the

gain

at

the

first

stage

and

assures

low

distortion

and

stability.

The

power

amplifier

stage

consists

of

an

inverted

Darlington

type

pure

complementary

circuit

to

improve

the

power

supply

efficiency

and

to

obtain

high

output

power.

If

DC

voltage

exceeding

specified

limit

is

developed

at

the

output

terminal,

the

protective

circuit

turns

off

the

relay

to

prevent

the

speakers

from

being

damaged.

This

circuit

also

functions

as

a

delay

start

circuit.

2.

SEPARATION

OF

LEFT

AND

RIGHT

CHANNELS

POWER

SUPPLY

This

power

supply

system

is

of

DPS

(dual

power

supply)

type

with

a

2-winding

transformer.

The

power

transformer

uses

a

large

sized

El

core

to

provide

excellent

regulation.

The

combination

of

this

transformer

and

a

large

filter

capacitor

forms

a

dual

power

supply

system

to

supply

power

to

L

and

R

channels

respectively.

This

power

supply

system

eliminates

dynamic

crosstalk

as

well

as

it

assures

reliable

operation

of

the

amplifier.

The

power

supply

unit

for

the

preamplifier

is

equipped

with

a

transistorized

power

voltage

regulator

to

improve

the

circuit

operation

stability

and

the

quality

of

sound.

3.

TONE

CONTROL

CIRCUIT

The

tone

control

circuit

has

FET

at

the

first

stage;

it

also

contains

dual

power

supply

unit,

2-stage

direct-coupled

flat

amplifier

and

bass/treble

control

circuit.

This

control

circuit

is

so

called

BAX

type

NF

control

circuit

that

assures

high

stability

and

low

distortion.

The

flat

amplifier

is

of

the

ICL

(input

capacitorless)

type

to

adjust

bass

and

treble

tones

up

to

±7.5

dB

at

about

1.5

dB

steps,

thus

enabling

fine

adjustment

of

tonal

quality.

4.

ICL

EQUALIZER

WITH

FET

CIRCUIT

This

circuit

is

a

simplified

ICL

circuit

consisting

of

FET

input

amplifier,

class-A

amplifier

and

pure

complementary

SEPP

amplifier.

The

use

of

newly

developed

super

low

noise

FET

and

cleverly

designed

circuit

reduces

the

impedance

of

the

entire

circuit

to

improve

S/N

ratio

to

86

dB

(2.5

mV

input,

IHF

A).

The

adoption

of

precision

resistors

and

film

capacitors

provides

RIAA

characteristic

with

error

of

±0.3

dB.

5.

SPECIAL

TAPE-THROUGH

CIRCUITRY

This

unit

has

facilities

for

simultaneous

recording

by

two

tape

decks

and

for

dubbing

from

deck

A

to

B.

In

addition,

Kenwood's

tape-through

circuitry

allows

you

to

dub

while

listening

to

a

different

program

source.

This

may

not

be

a

feature

you

will

use

every

day,

but

it

is

quite

practical

and

will

be

appreciated

when

the

occasion

arises.

6.

LARGE

POWER

METERS

VISUALLY

SHOW

OUTPUT

POWER

With

these

full-size

Power

meters

you

always

know

what

your

amplifier

is

doing.

You

can

visually

check

output

and

balance

channels.

A

refinement

for

audiophiles,

these

meters

are

large

and

illuminated

for

easy

reading.

Notice

that

sensitivity

is

adjustable

for

operation

at

both

high

and

low

levels

to

get

maximum

range

in

both

cases.

High:

0.1W

to

80W;

low,

0.01

W

to

3W.

7.

TWO

SPEAKER

SYSTEMS

You

can

attach

two

speaker

systems

and

select

either

or

both.

8.

LOUDNESS

CONTROL

This

control

(-h8

dB

at

100

Hz)

boosts

especially

the

low

frequency

range

at

a

low

listening

level

and

offers

you

splendid

stereo

reproduction.

9.

BALANCE

CONTROL

This

control

performs

the

volume

adjustment

of

right/left

speakers

and

headphones.

10.

EXCELLENT

DESIGN

Kenwood's

excellence

of

design

and

superior

craftsmanship

is

evident

not

only

in

the

electronics

of

the

unit

but

also

in

all

the

controls.

11.

OTHERS

•

41

-click

master

volume

to

suit

audiophiles'

tastes.

•

Subsonic

filter

of

18

Hz,

6

dB/oct.

KA-6100

(K)

3

INTERCONNECTING

DIAGRAM

TURNTABLE

SPEAKER

SYSTEMS

A

LEFT

RIGHT

SPEAKER

SYSTEMS

B

LEFT

RIGHT

To

AC

OUTLET

TUNER

TAPE

DECK

B

AC

OUTLETS

The

AC

outlets

on

the

rear

panel

of

the

amplifier

may

be

used

to

supply

power

to

other

components,

such

as

a

turntable,

tape

deck,

etc.

1.

SWITCHED

outlets

These

outlets

are

controlled

by

the

POWER

switch

on

the

front

panel.

(The

total

capacity

is

100

watts

maximum.)

2.

UNSWITCHED

outlet

This

outlet

delivers

power

at

all

times.

(The

capacity

is

300

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

con¬

sumption

exceeds

the

capacity

of

each

outlet.

4

KA-6100

(K)

CONNECTING

INSTRUCTIONS

SPEAKER

CONNECTING

AND

SPEAKERS

SWITCH

In

connecting

only

one

pair

of

speakers,

con¬

nect

the

right

speaker

to

"RIGHT"

and

left

speaker

to

"LEFT"

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

lack

of

separation.

To

connect

an

additional

pair~of

speakers,

connect

right

speaker

to

"RIGHT"

and

left

speaker

to

"LEFT"

of

the

SPEAKERS

B

terminals.

When

connecting

the

speaker

leads

to

the

speaker

terminals,

make

sure

that

the

bare

wires

strands

at

the

tips

of

the

speaker

leads

do

not

touch

each

other

or

adjacent

terminal.

It

is

recommended

that

the

wires

of

in¬

dividual

cord

lead

tips

are

soldered,

or

they

are

stranded

together

to

eliminate

any

possibility

of

short-circuits

forming

in

the

speaker

connecting

network.

Note:

-

Each

speaker

should

be

4

ohms

or

more

in

impedance

when

only

one

pair

of

speakers

are

used.

However,

it

should

be

8

ohms

or

more

when

two

pairs

of

speakers

are

used

at

the

same

time

(A

+

B).

TURNTABLE

CONNECTION

The

two

shielded

audio

cables

from

your

stereo

turntable

are

normally

terminated

with

phono

plugs.

Connect

the

left

channel

of

the

turn¬

table

to

"LEFT"

of

the

PHONO

input

jack

and

the

right

channel

to

"RIGHT"

of

the

PHONO

input

jack.

If

the

turntable

has

a

grounding

wire,

con¬

nect

it

to

this

unit's

GND

terminal

to

avoid

hum.

TUNER

CONNECTION

Use

the

TUNER

terminals

for

connection

to

an

FM

stereo

or

AM-FM

stereo

tuner.

Connect

the

left

channel

of

the

tuner

to

"LEFT"

of

the

TUNER

input

jack

and

the

right

channel

of

the

tuner

to

"RIGHT"

of

the

TUNER

in¬

put

jack.

AUX

(AUXILIARY

INPUTS)

High

level

AUX

input

jacks

are

for

mis¬

cellaneous

sources,

such

as

extra

tape

decks,

ad¬

ditional

tuners

and/or

receivers,

TV

sound

outputs,

and

other

external

components.

10

mm

Remove

insulation

from

lead

tip.

(f)

Strand

wire.

SPEAKER

LEAD

TIPS

Loosen

the

screw

TAPE

DECK

CONNECTION

Recording

A

tape

deck

can

be

connected

for

recording

as

follows:

the

left

channel

input

of

the

tape

deck

to

"LEFT"

of

the

TAPE

A

REC

jack,

the

right

channel

input

of

the

tape

deck

to

"RIGHT"

of

the

TAPE

A

REC

jack.

Playback

A

tape

deck

can

be

connected

for

playback

as

follows:

the

left

channel

output

of

the

tape

deck

to

"LEFT"

of

the

TAPE

A

PLAY

jack,

right

channel

output

of

the

tape

deck

to

"RIGHT"

of

the

TAPE

A

PLAY

jack.

If

an

additional

tape

deck

is

used

and

two

tape

decks

are

operated

simultaneously,

the

same

connections

must

be

provided

for

the

TAPE

B

jacks.

DIN

CONNECTOR

(REC/PLAY

CONNECTOR)

If

your

tape

deck

is

equipped

with

a

DIN

connector,

connect

it

to

the

TAPE

B

REC/PLAY

connector

with

a

DIN

connecting

cord.

A

DIN

connector

enables

recording

and

playback

with

this

single

cord.

Notes:-

1)

The

REC/PLAY

connector

corresponds

to

the

TAPE

B

REC

and

TAPE

B

PLAY

jacks

-

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

TAPE

B

PLAY

and

TAPE

B

REC

jacks

should

not

be

used.

KA-6100

(K)

5

CONTROLS

AND

FUNCTIONS

®

POWER

switch

ON.The

unit

is

turned

on.

OFF.The

unit

is

turned

off.

®

PHONES

jack

Plug

a

stereo

headphones

into

this

jack.

For

private

listening

through

headphones,

set

the

SPEAKERS

switch

to

"OFF"

(D

SPEAKERS

switch

OFF.All

speakers

are

silenced

for

private

headphones

listening.

A.

S

p

e

a

k

e

r

s

connected

to

the

SPEAKERS

A

terminals

on

the

rear

panel

are

activated.

B.

S

p

e

a

k

e

r

s

connected

to

the

SPEAKERS

B

terminals

are

activated.

A

B.Two

pairs

of

speakers

connected

to

the

SPEAKERS

A

and

B

terminals

are

simultaneously

activated.

©VOLUME

control

This

control

performs

simultaneous

adjustment

of

volumes

in

both

channels

(right

and

left).

Set

it

to

your

own

most

satisfactory

listening

level.

<D

BALANCE

control

This

control

adjusts

unequal

volume

from

any

program

source

in

right

and

left

channels.

The

left

channel

is

accentuated

when

this

control

is

turned

from

the

center

"0"

toward

the

left

side

and

con¬

versely.

©TAPE

switch

PLAY:

SOURCE

-

The

source

signal

is

heard.

TAPE

A

-

It

is

available

to

monitor

a

recording

or

for

playback

on

a

tape

deck

connected

to

the

TAPE

A

jacks.

Sound

recorded

on

the

tape

is

heard.

TAPE

B

—

It

is

available

to

monitor

a

recording

or

for

playback

on

a

tape

deck

connected

to

the

TAPE

B

jacks.

Sound

recorded

on

the

tape

is

heard.

Note:

-—-

Except

for

tape

playback

and

for

monitoring

a

recording,

make

sure

it

is

in

the

"SOURCE"

position.

DUBBING

(A

►

B):

B

MON

—

It

is

available

to

dub

from

a

tape

deck

connected

to

the

TAPE

A

jacks

into

a

tape

deck

connected

to

the

TAPE

B

jacks.

The

recording

condition

of

the

tape

deck

B

can

be

monitored.

SOURCE

MON

-

Parallel

with

the

tape

dub

operation

(A

►

B),

this

position

makes

it

possible

to

reproduce

simultaneously

from

the

speakers

other

program

sources

selected

by

the

INPUT

SELECTOR

switch

such

as

an

FM

broadcast

or

phono

disc

reproduction.

©

INPUT

SELECTOR

switch

PHONO.The

turntable

is

available

if

connected

to

the

PHONO

input

jacks

on

the

rear

panel.

TUNER.The

tuner

is

available

if

connected

to

the

TUNER

input

jacks

on

the

rear

panel.

AUX.Source

connected

to

the

AUX

jack

is

available.

i

6

KA-610CMK)

CONTROLS

AND

FUNCTIONS

(g)

POWER

meters

These

meters

indicate

the

strength

of

the

output

volume

level.

They

can

be

read

directly

in

watts

from

0.01

to

80

watts

on

the

scale

for

speaker

im¬

pedance

of

8

ohms

(controlled

by

the

Meter

Range

switch).

When

speaker

impedance

is

4

ohms,

output

power

is

twice

the

figure

on

the

scale.

If

speaker

impedance

is

16

ohms,

output

power

is

then

half

the

scale

amount.

However,

musical

signals

actually

assume

complex

wave

forms

with

much

variations,

and

the

indicated

power

corresponds

approximately

to

the

mean

value

of

these

wave

forms.

(D

METER

RANGE

switch

This

switch

controls

the

sensitivity

of

both

the

left

and

right

channel

output

level

meters.

Use

the

switch

suitable

for

your

listening

requirements.

Note:

-

To

protect

the

meters

from

overswing,

make

it

a

practice

to

move

up

the

switch

to

the

"80W"

first,

and

advance

successively

to

"3W”

when

no

deflection

can

be

observed.

©LOUDNESS

switch

This

switch

boosts

bass

response

to

compensate

for

the

human

ear's

lack

of

response

to

those

fre¬

quencies

at

low

volume

levels.

This

switch

should

be

set

to

"OFF"

when

listening

at

normal

and

high

levels.

@

TONE

switch

In

position

"DEFEAT",

the

bass

and

treble

control

do

not

function.

By

switching

between

"DEFEAT"

and

"ON",

this

enables

you

making

frequency

response

measurements

of

phono

cartridges,

speakers

and

the

acoustic

conditions

of

the

room.

(Q)

TONE

controls

These

controls

are

for

adjusting

the

bass

and

tre¬

ble

response.

They

are

a

click

step

type

control

by

approximately

1.5

dB.

Turning

the

controls

clockwise

increase

bass

and

treble

response

and

counterclockwise

decrease

bass

and

treble

response.

Bass

and

treble

controls

do

not

func¬

tion

when

the

TONE

switch

is

set

to

"DEFEAT".

©SUBSONIC

FILTER

switch

Frequencies

below

18

Hz

are

attenuated

by

6

dB/octave.

Although

such

subsonic

frequencies

are

inaudible

to

the

human

ear,

they

can

cause

in¬

termodulation

distortions

and

even

damage

to

the

speakers.

It

is

recommendable

to

set

the

lever

"ON"

at

all

times,

even

if

no

record

rumble

etc.

are

heard.

"OFF"

position

is

no

attenuation

of

sub¬

sonic

frequencies.

KA-6100

(K)

7

OPERATING

INSTRUCTIONS

At

correct

position

for

speakers

to

be

driven:

A,B,A

-p

B

The

POWER

switch

should

be

turned

on

after

all

knob

settings

Set

it

to

have

been

made.

”80W''

position

Set

it

to

Set

it

to

a

desired

"0”

position

program

source

Prior

to

switching

power

ON.

RADIO

RECEPTION

1.

Set

the

INPUT

SELECTOR

switch

to

"TUNER".

2.

Operate

the

tuner

as

usual.

3.

Use

the

VOLUME,

BASS,

TREBLE,

BALANCE,

etc.

controls

to

adjust

sound

as

desired

and

to

match

the

acoustic

conditions

of

your

room.

TURNTABLE

OPERATION

1.

Set

the

INPUT

SELECTOR

switch

to

"PHONO".

2.

Operate

the

turntable.

3.

Use

the

VOLUME,

TREBLE,

BALANCE,

etc.,

controls

to

obtain

the

desired

listening

volume

and

tonal

quality.

TAPE

DECK

OPERATION

Tape

Monitoring

If

you

use

the

amplifier

with

3-head

type

tape

decks,

you

can

check

the

sound

quality

of

the

recording

that

is

being

made

by

momentarily

com¬

paring

the

recorded

signal

with

the

source

signal

as

follows:

Set

the

TAPE

switch

to

"TAPE

A"

(or

"TAPE

B")

to

monitor

the

recorded

sound.

Set

the

TAPE

switch

to

"SOURCE"

to

monitor

the

source

signal

before

it

is

recorded.

When

Recording

with

One

Tape

Deck

Connect

the

tape

deck

to

either

TAPE

A

jacks

or

TAPE

B

jacks

on

the

rear

panel.

Recording

1.

Set

the

INPUT

SELECTOR

switch

to

the

desired

program

source;

PHONO,

TUNER

or

AUX.

2.

Set

the

TAPE

switch

to

"TAPE

A"

or

"TAPE

B"

whichever

side

the

tape

deck

is

con¬

nected.

3.

Recording

level

should

be

adjusted

with

the

volume

control

of

your

tape

deck.

4.

Recording

is

not

affected

by

the

VOLUME,

BASS,

TREBLE,

LOUDNESS,

etc.,

controls

of

the

unit.

When

Recording

with

Two

Tape

Decks

Connect

one

tape

deck

to

the

TAPE

A

jacks

and

the

other

to

the

TAPE

B

jacks

on

the

rear

pan¬

el.

Recording

1.

Set

the

INPUT

SELECTOR

switch

to

the

desired

program

source;

PHONO,

TUNER

or

AUX.

2.

Set

the

TAPE

switch

to

"SOURCE".

3.

Recordings

can

now

be

made

into

both

tape

decks

simultaneously.

To

monitor

these

recordings,

use

the

TAPE

switch

as

follows:

Set

it

to

"TAPE

B"

to

monitor

the

recording

being

made

in

the

tape

deck

connected

to

TAPE

B

jacks.

Note:

-

In

case

of

recording

with

two

tape

decks,

a

source

signal

can

not

be

recorded

in

the

tape

deck

connected

to

"TAPE

B"

jacks

when

the

TAPE

switch

is

set

to

"TAPE

A".

Therefore,

be

sure

to

set

the

TAPE

switch

to

"SOURCE"

or

"TAPE

B"

only.

8

KA-6100

(K)

OPERATING

INSTRUCTIONS

4.

Recording

levels

should

be

adjusted

with

the

volume

controls

of

your

tape

decks.

5.

Recording

is

not

affected

by

the

VOLUME,

BASS,

TREBLE,

FILTER,

LOUDNESS,

etc.,

controls

of

the

unit.

Playback

1.

The

INPUT

SELECTOR

switch

can

be

in

any

position.

2.

Set

the

TAPE

switch

to

the

corresponding

position

"TAPE

A"

or

"TAPE

B".

3.

Adjust

volume

and

tonal

quality.

Dubbing

Tape

recordings

may

be

easily

duplicated

from

one

tape

deck

to

another

with

minimal

loss

of

quality

by

setting

the

TAPE

switch

to

"B

MON"

or

"SOURCE

MON"

as

follows:

1.

The

INPUT

SELECTOR

switch

can

be

in

any

position.

2.

Set

the

TAPE

switch

to

"B

MON"

when

it

is

desired

to

copy

recorded

material

on

the

tape

deck

A

for

recording

on

the

tape

deck

B.

The

recording

can

be

monitored.

In

addition,

"SOURCE

MON"

position

can

be

done

at

the

same

time

that

a

different

source

signal

such

as

an

FM

broadcast

or

phono

disc

is

being

reproduced

through

the

speakers.

Note:

-

Be

sure

to

set

the

TAPE

switch

to

"B

MON"

or

"SOURCE

MON"

only.

©TAPE

Tape

Recording

:

The

input

signal

selected

by

the

INPUT

SELECTOR

switch

is

always

present

at

a

fixed

level

at

the

TAPE

A

and

TAPE

B

REC

jacks.

TAPE

A

TAPE

A

TAPE

B

REC„

_PLAY

REC„

„PLAY

Tape

Playback

:

Playback

signal

enters

TAPE

A

PLAY

jacks,

and

is

heard

from

the

speakers.

TAPE

A

TAPE

B

Tape

Playback

:

Playback

signal

enters

TAPE

B

PLAY

jacks,

and

is

heard

from

the

speakers.

TAPE

A

TAPE

B

/'nT'LAT

NtLv-v

^.rT-AT

.jtZTTL^

Dubbing

:

Playback

signal

from

tape

deck

A

enters

via

TAPE

A

PLAY

jacks,

passes

through

TAPE

switch

B

MON,

and

is

recorded

by

tape

deck

B.

Dubbing

:

TAPE

A

TAPE

B

REC~

~PLAY

REC~

^PLAY

■

<

Playback

signal

from

tape

deck

A

enters

via

TAPE

A

PLAY

jacks,

passes

through

TAPE

switch

SOURCE

MON,

and

is

recorded

by

tape

deck

B.

In

ad¬

dition,

this

position

makes

it

possible

that

a

different

source

signal

such

as

an

FM

broadcast

or

phono

disc

is

being

reproduced

through

the

speakers.

KA-6100

(K)

9

MAINTENANCE

CLEANING

PRECAUTIONS

Do

not

use

volatile

liquid

such

alcohol,

thinner,

gasoline,

benzine,

etc.,

when

cleaning

the

unit

surface.

Use

silicon

cloth

or

soft

dry

cloth.

POWER

PLUG

•

Switch

off

the

unit

and

disconnect

the

power

plug

from

your

AC

outlet

immediately

if

the

abnormality

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

elec¬

tric

shock.

Besides,

do

it

by

holding

the

power

plug

itself,

not

the

power

cord.

•

It

is

desirable

to

disconnect

the

power

plug

from

your

AC

outlet

when

you

leave

your

house

for

a

long

time.

POWER

CORD

•

The

power

cord

must

not

be

pulled

strongly,

nor

bent

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.

•

Do

not

put

a

heavy

thing

on

the

power

cord.

PREVENTION

OF

INTRUSION

OF

METALLIC

SUBSTANCE

IN

UNITS

The

case

top

is

provided

with

ventilation

holes.

Never

close

these

holes

with

ornamental

cloth,

etc.

Be

careful

not

to

put

a

coin,

hairpin,

needle,

etc.,

into

the

unit

through

the

holes.

Otherwise,

it

may

be

a

case

of

malfunction

and

electric

shock.

Such

trouble

is

often

caused

by

in¬

fants.

PREVENTION

OF

MODIFICATION

Each

unit

is

shipped

after

passing

careful

adjustments

to

the

optimum

operating

con¬

ditions.

The

unit

interior

must

not

be

modidified.

Some

parts

of

the

interior

are

applied

with

high

voltage.

Never

dismantle

the

case

and

touch

the

internal

parts.

Only

the

qualified

servicemen

are

in

charge

of

check-in

the

interiors.

PROTECTION

OF

SPEAKERS

SYSTEM

Lower

the

sound

volume

when

switching

the

amplifier

on

or

changing

over

the

program

source

to

another.

You

should

make

it

a

rule

to

move

the

volume

control

knob

to

a

low

sound

level

before

you

turn

the

POWER

switch

on.

Sudden

feeding

of

a

large

input

power

may

damage

the

speaker

systems.

If

you

keep

such

a

habit,

the

speaker

systems

can

be

protected

against

the

attack

of

violent

noise

occurring

when

a

stylus

is

put

on

a

disc

or

broadcasting

station

is

selected.

ACOUSTIC

FEEDBACK

Occasionally

a

disturbing

howling

sound

caused

by

acoustic

feedback,

may

be

heard.

This

is

generally

caused

by

the

relative

positions

of

the

turntable

and

speaker

enclosures.

The

sound

pressure

radiated

from

the

speaker

box

surrounds

and

vibrates

the

turntable.

This

vibration

is

picked

up

by

the

cartridge,

sent

to

the

unit

as

an

electrical

signal,

and

return¬

ed

to

the

speaker.

This

again

causes

the

speakers

to

radiate

vibration

which

induces

sympathetic

vibrations

in

the

turntable

and

cartridge.

Sym¬

pathetic

vibrations

are

reinforced

with

each

repeating

cycle

and

result

in

an

undesirable

sound

called

oscillation

or

“howling".

To

prevent

it,

keep

your

turntable

away

from

your

speakers.

Also

mounting

your

turntable

on

shock-absorbing

pads

may

help.

10

KA-6100

(K)