Kenwood L-A1 Manual de usuario

Tabla de contenidos

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KE

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A

l

Instruction

Manual

=

INTEGRATED

AMPLIFIER

Introduction

Thank

you

for

buying

the

Kenwood

L-A1

integrated

amplifier.

Please

read

this

manual

carefully

to

ensure

that

you

get

the

greatest

possible

use

and

satisfaction

from

your

amplifier.

Keep

this

manual

in

a

safe

place

for

future

reference.

Contents

Caution:

Read

the

pages

marked

A\

carefully

to

ensure

safe

operation.

‘

es

m

R

Accessories

A

Before

applying

power

3

How

to

use

the

amplifier

12

Make

sure

that

all

accessories

are

put

aside

Listening

through

the

main

source

so

they

will

not

be

lost.

Playing

records

A

Safety

precautions

3

Listening

through

headphones

Muting

the

sound

Remote

control

(1)

A\

Important

safeguards

4

S

P

Z

How

to

record

music

14

Selecting

a

music

source

for

recording

:

og

Listening

to

a

second

music

source

while

recording

About

your

new

Kenwood

L-A1

amplifier

6

ion

totind

Recoring

Dubbing

music

fk

;

Listening

to

a

second

music

source

while

dubbing

.

dry

ee

(R6/SUM-3)

12

How

to

set

up

your

new

amplifier

8

Hee

Mn

Me

Temata

Contant)

Troubleshooting

18

Names

of

parts

10

Stand

by

mode

of

POWER

switch

Block

diagram

19

Shorting

pins

(2)

How

to

use

the

remote

control

1

Ass

<A

Inserting

the

batteries

Characteristics

charts

20

Operating

the

remote

control

AC

plug

adaptor

(1)

on

:

{Except

for

some

areas)

Specifications

2)

For

the

unit

with

a

European

a

a

a

AC

plug

in

areas

other

than

Europe.

N

Before

applying

power

For

Europe

A\

Caution:

Read

this

page

carefully

to

ensure

safe

operation.

For

other

countries

important!

Units

shipped

to

Europe

are

designed

for

operation

on

230

V

AC

only.

For

the

United

Kingdom

Important!

Units

shipped

to

the

U.K.

are

designed

for

operation

on

240

volts

AC

only.

The

mains

plug

must

be

removed

from

the

wall

socket

prior

to

any

internal

examination.

The

wires

in

this

mains

lead

are

coloured

in

accordance

with

the

following

code:

BlUGsxcesecre

etn

ated

ee

Neutral

BLOWN):

csccsssevabseceiereevednensipencdieths

Live

The

wires

in

this

mains

lead

must

be

connected

to

the

terminals

in

the

plug

as

follows:

Wire

colour

Plug

terminal

marking

»

(BIUO.

ss

aishditieeenda

nies

N

or

Black

BrOWNinn

ccs

iestasees

tevaasiesdosseaeauatys

L

or

Red

|

Brown

to

Live

Blue

to

€

)

Neutral

N

Plug

-—

Notes:

1.

Ifa

13-amp

plug

is

used,

this

must

be

fitted

with

a

13-amp

fuse.

2.

Ifa

3-pin

plug

with

earthing

contact

is

used,

no

wire

must

be

connected

to

the

E

terminal.

Important!

Units

shipped

to

countries

not

specified

on

the

left-hand

side

are

equipped

with

an

AC

voltage

selector

switch

on

the

rear

panel.

Refer

to

the

following

paragraph

for

the

proper

setting

of

this

switch.

AC

voltage

selection

This

unit

operates

on

110

-

120

or

220

-

240

volts

AC.

The

AC

voltage

selector

switch

Type

A

or

Type

B

on

the

rear

panel

is

set

to

the

voltage

that

prevails

in

the

area

to

which

the

unit

‘is

shipped.

Before

connecting

the

power

cord

to

your

AC

outlet,

make

sure

that

the

setting

position

of

this

switch

matches

your

line

voltage.

If

not,

it

must

be

set

to

your

voltage

in

accordance

with

the

following

direction.

Note:

—_

Our

warranty

does

not

cover

damage

caused

by

excessive

line

voltage

due

to

improper

setting

of

the

AC

voltage

selector

switch.

Safety

precautions

AC

voltage

selector

switch

Type

A

=

AC

110-

AC

220-

120V~

240v~

Type

B

AC

110-

|

AC

22e0V~

AC

230-

OvV~

240V~

Move

switch

Jever

to

match

your

line

voltage

with

a

small

screwdriver

or

other

pointed

tool.

WARNING:

TO

PREVENT

FIRE

OR

ELECTRIC

SHOCK,

DO

NOT

EXPOSE

THIS

APPLIANCE

TO

RAIN

OR

MOISTU

As

CAUTION

CAUTION:

TO

REDUCE

THE

RISK

OF

ELECTRIC

SHOCK,

DO

NOT

REMOVE

MISK'OF

ECEGTRIS

SHOCK

COVER

(OR

BACK).

NO

USER-SERVICEABLE

PARTS

INSIDE,

REFER

DO

NOT

OPEN

SERVICING

TO

QUALIFIED

SERVICE

PERSONNEL.

THE

LIGHTNING

FLASH

WITH

ARROWHEAD

SYMBOL,

WITHIN

AN

EQUILATERAL

TRIANGLE,

IS

INTENDED

TO

ALERT

THE

USER

T

TO

THE

PRESENCE

OF

UNINSULATED

“DANGEROUS

VOL-

TAGE”

WITHIN

THE

PRODUCT'S

ENCLOSURE

THAT

MAY

BE

OF

SUFFICIENT

MAGNITUDE

TO

CONSTITUTE

A

RISK

OF

ELECTRIC

SHOCK

TO

PERSONS.

THE

EXCLAMATION

POINT

WITH!

THE

USER

TO

THE

PRESENCE

N

AN

EQUILATERAL

TRIANGLE

IS

INTENDED

TO

ALERT

OF

IMPORTANT

OPERATING

AND

MAINTENANCE

(SERVICING)

INSTRUCTIONS

IN

THE

LITERATURE

ACCOMPANYING

THE

APPLIANCE.

Important

safeguards

A

Caution:

Read

this

page

carefully

to

ensure

safe

operation.

Please

read

all

of

the

safety

and

operating

instructions

before

operating

For

best

results,

follow

all

warnings

placed

on

the

unit

and

adhere

to

the

operating

and

use

instructions.

These

safety

and

operating

instruc-

tions

should

be

retained

for

future

reference.

this

unit.

Note:

Power

sources

—

The

unit

should

be

connected

to

a

power

supply

only

of

the

type

described

in

the

operating

instructions

or

as

marked

on

the

appliance.

Power-cord

protection

—

Power-supply

cords

should

be

routed

so

that

they

are

not

likely

to

be

walked

on

or

pinched

by

items

placed

upon

or

against

them,

pay

particular

attention

to

cords

at

plugs,

convenience

receptacles,

and

the

point

where

they

exit

from

the

unit.

Grounding

or

polarization

—

The

precautions

should

be

taken

so

that

the

grounding

or

polarization

means

of

this

unit

is

not

defeated.

Ventilation

—

The

unit

should

be

situated

so

that

its

location

or

position

does

not

interfere

with

its

proper

ventilation.

To

maintain

good

ventilation,

do

not

put

records

or

a

table-cloth

on

the

unit.

Place

the

unit

at

least

10

cm

away

from

the

walls.

Do

not

use

the

unit

on

a

bed,

sofa,

rug

or

similar

surface

that

may

block

the

ventilation

openings.

Water

and

moisture

—

The

unit

should

not

be

used

near

water

-

for

example,

near

a

bathtub,

washbowl,

kitchen

sink,

laundry

tub,

in

a

wet

basement,

or

near

a

swimming

pool,

etc.

Temperature

—

The

unit

may

not

function

properly

if

used

at

extremely

low,

or

freezing

temperatures.

The

ideal

ambient

temperature

is

above

+5°C

(41°F).

Heat

-

The

unit

should

be

situated

away

from

heat

sources

such

as

radiators,

heat

registers,

stoves,

or

other

units

(including

amplifiers)

that

produce

heat.

Electric

shock

—

Care

should

be

taken

so

that

objects

do

not

fall

and

liquid

is

not

spilled

into

the

enclosure

through

openings.

If

a

metal

object,

such

as

a

hair

pin

or

a

needle,

comes

into

contact

with

the

inside

of

this

unit,

a

dangerous

electric

shock

may

result.

For

families

with

children,

never

permit

chil-

dren

to

put

anything,

especially

metal,

inside

this

unit.

Item

3

is

not

required

except

for

grounded

or

polarized

equipment.

10.

11,

12.

Enclosure

removal

—

Never

remove

the

en-

closure.

If

the

internal

parts

are

touched

accidentally,

a

serious

electric

shock

might

occur.

Magnetic

fields

-

Keep

the

unit

away

from

sources

of

magnetic

fields

such

as

TV

sets,

speaker

systems,

radios,

motorized

toys

or

magnetized

objects.

Cleaning

—

Do

not

use

volatile

solvents

such

as

alcohol,

paint

thinner,

gasoline,

or

benzine,

etc.

to

clean

the

cabinet.

Use

a

clean

dry

cloth.

Carts

and

stands

—-

An

appliance

and

cart

combination

should

be

moved

with

care.

Quick

stops,

excessive

force,

and

uneven

surfaces

may

cause

the

appliance

and

cart

combina-

tion

to

overturn.

13.

14.

15.

16.

17.

Nonuse

periods

—

The

power

cord

of

the

unit

should

be

unplugged

from

the

outlet

when

left

un-used

for

a

long

period

of

time.

Abnormal

smell

—

If

an

abnormal

smell

or

smoke

is

detected,

immediately

turn

the

power

OFF

and

pull

out

the

power

cord.

Contact

your

dealer

or

nearest

service

center.

Damage

requiring

service

—

The

unit

should

be

serviced

by

qualified

service

personne!

when:

A.

The

power-supply

cord

or

the

plug

has

been

damaged;

or

B.

Objects

have

fallen,

or

liquid

has

been

spilled

into

the

unit;

or

C.

The

unit

has

been

exposed

to

rain;

or

D.The

unit

does

not

appear

to

operate

normally

or

exhibits

a

marked

change

in

performance;

or

.

The

unit

has

been

dropped,

or

the

enclo-

sure

damaged.

m

Servicing

-

The

user

should

not

attempt

to

service

the

unit

beyond

that

described

in

the

operating

instructions.

All

other

servicing

should

be

referred

to

qualified

service

personnel.

AC

outlets

—

Do

not

connect

other

audio

equip-

ment

with

a

power

consumption

larger

than

that

specified

to

the

AC

outlet

on

the

rear

panel.

Never

connect

other

electrical

units,

such

as

an

iron

or

toaster,

to

it

to

prevent

fire

or

electric

shock.

A\

Caution

:

Read

this

page

carefully

to

ensure

safe

operation.

Stro6mbrytarens

POWER

beredskapslage

Indikatorn

STAND

BY

tands

efter

natkabelns

anslutning

till

ett

vagguttag,

oavsett

str6mbrytarens

POWER

ttill/

franslag.

Detta

anger

att

en

liten

mangd

strém

leds

till

komponenten

som

stéd

fér

minnesinnehallet.

Detta

lage

kallas

fér

beredskapslaget.

Str6mbrytaren

pa

fjarrkontrollen

kan

anvandas

for

att

sla

pa

och

av

str6mmen

sa

lange

indikatorn

STAND

BY

lyser.

Virtanappaimen

(POWER)

valmiustila

(STAND

BY)

Kun

laitteen

verkkojohto

on

liitetty

pistorasiaan,

valmiustilan

merkkivalo

syttyy

riippumatta

virtanappaimen

(POWER)

asennosta

(ON/OFF).

Merkkivalo

osoittaa,

etta

laitteessa

on

hieman

virtaa

muistin

sisaltdjen

yllapitoa

varten,

Tata

tilaa

kutsutaan

valmiustilaksi.

Kun

valmiustilan

merkkivalo

(STAND

BY)

palaa,

laitteen

virta

voidaan

kytkea

ja

katkaista

kaukosaatimella.

Afbrydertastens

(POWER)

STAND

BY

funktion

Nar

apparatets

stremledning

er

tilsluttet

en

stikkontakt,

lyser

STAND

BY

indikatoren,

uanset

om

der

er

taendt

ved

afbryderen

pa

apparatet

eller

ej.

Det

angiver,

at

apparatet

bliver

forsynet

med

enganske

lille

mzengde

stram

til

opret-holdelse

af

hukommelsens

indhold.

Denne

funktion

kaldes

STAND

BY.

Nar

STAND

BY

indikatoren

er

teendt,

kan

stremmen

til

apparetet

slas

til

og

fra

med

fjernsty-

ringsenheden.

PA/AV-knappens

Stand-by

funksjon

Nar

stromledningen

til

dette

anlegget

er

satt

i

en

vekselstramskontakt,

vil

STAND-BY

indikatorlampen

lyse

enten

PA/AV-knappen

er

pa-eller

avsiatt.

Dette

betyr

at

en

viss

mengde

strom

tilfgres

anlegget

slik

at

innholdet

i

minnet

ikke

gar

tapt.

Denne

funksjonen

kalles

Stand-by.

Nar

indikatorlampen

for

STAND-

BY

er

tent,

kan

strammen

slas

PA/AV

fra

fjernkontrollen.

About

your

new

Kenwood

L-A1

amplifier

Tan)

e)cenacxe

me

hvaal-lanlrom-}(erar-]mcomare)(si-m

ec]

ale)

All

the

power

you

need

and

more

®

Super

C!

All

amplifier

circuits

in

the

Kenwood

L-A1

amplifier

use

our

newly

developed

Super

C‘

circuits

(Super

Constant

Current

Cascade

Circuit).

While

most

amplifiers

use

differential

amplifier

circuits,

in

designing

the

Super

C4

we

focused

on

a

new

way

of

reducing

the

in-phase

noise

normally

suppressed

by

using

the

common-mode

rejection

ratio

(CMRR)

inherent

to

differential

amplifiers.

The

result

was

a

dramatic

reduction

in

the

noise

generated

in

the

first

stages

of

the

amplifier

circuits.

+VCC

Ordinary

design

OUT

OUT

2

N41

IN2

0

—

ts

VES

L-A1

4VCC

CC

e

Revolving

resistor

volume

The

master

volume

of

the

L-Al

amplifier

uses

a

newly

developed

large-scale

(type

32)

revolving

resistor

volume.

While

ordinary

volumes

have

a

slider

that

moves

over

the

resistor,

the

slider

in

the

L-A1

is

fixed

over

the

volume

while

the

resistor

is

rotated.

This

design

eliminates

the

connection

formerly

created

by

crimping

between

the

printed

circuit

board

and

the

resistor

and

allows

the

amplifier

to

deliver

better

sound.

This

revolving

resistor

design

also

makes

it

possible

to

realize

special

variant

control

characteristics

which

in

turn

made

it

possible

for

us

to

use

a

master

volume

with

the

unbelievably

low

impedance

of

1k

Q.

This

gives

you

the

low

impedance

you

need

in

actual

use,

and

reduces

the

noise

generated

from

the

volume

and

main

amplifier

to

the

barest

minimum.

®

Multiple-driver

system

The

power

amplification

system

uses

four

parallel

push-pull

circuits

with

large-scale

transistors

(Pc=120W),

which

make

it

possible

for

the

L-A1

to

produce

strong

output

even

when

the

impedance

of

speaker

systems

has

fallen

low

at

some

frequencies.

In

ordinary

parallel

push-pull

circuits,

only

the

power

transistors

in

the

final

stage

are

connected

in

parallel,

while

all

other

driver

transistors

in

the

previous

stage

are

usedin

common.

.

The

multi-driver

system

used

in

the

L-A1,

however,

includes

a

group

of

driver

transistors

for

each

group

of

power

transistors

in

a

design

that

connects

four

groups

of

Darlington

circuits

in

true

parallel.

This

circuit

structure

reduces

the

load

on

individual

transistors,

making

it

possible

to

gain

a

stable

circuit

operation

with

sufficient

current

and

less

heat.

Ordinary

design

L-A1

IN

t+-———o

OUT

iNO———~+

—O

OUT

e

VIG

circuits

The

power

amplification

system

also

uses

voltage

interface

gate

(VIG)

circuits

which

ensure

a

clean

source

of

power

for

your

L-A1

free

of

impurities

such

as

ripples,

load

fluctuation,

or

other

inter-

modulation

distortion.

From

the

point

of

view

of

the

power

amplification

system,

this

results

in

the

same

benefits

as

would

be

gained

from

a

far

more

powerful

power

system.

e

A

heatsink

design

that

separates

the

final

and

driver

transistors

The

large-scale

heatsink

with

a

7

mm

thick

base

is

used

in

the

power

amplifier

was

designed,

and

makes

it

possible

to

stand

up

to

even

loads

of

2

Q.

By

laying

out

the

final

and

driver

transistors

separately

on

both

sides

of

the

heatsink,

it

doubles

as

a

shield

to

prevent

interference

between

the

large

and low

current

systems.

e

A

high-capacity

toroidal

transformer

The

Kenwood

L-A1

uses

a

toroidal

transformer

that

gives

off

very

little

magnetic

leakage

and

responds

well

to

load

fluctuation.

Combined

with

aluminum

electrolytic

capacitors

and

with

a

capacity

of

as

much

as

450VA

per

transformer,

these

transformers

give

you

all

the

power

you

need—and

more.

rei

cele

hem

ace

ice

mere]eliatsime(-1-s1e]

a

©

Separated

blocks

for

a

sturdy,

rigid

design

The

cabinet

of

the

Kenwood

L-A1

uses

a

frame

design

composed

of

2

mm

thick

steel

plates

held

together

with

4

mm

screws

for

the

kind

of

rigidness

you

don’t

often

find.

By

making

the

cabinet

tough,

we’ve

created

a

sturdy,

solid

foundation

that

assures

you

of

a

deep,

rich

sound.

By

adopting

a

frame

design

where

individual

parts

are

assembled

together

into

a

single

cabinet,

we

have

been

able

to

separate

blocks

such

as

the

main

and

subsidiary

power

units,

the

input

unit,

and

the

power

supply

in

order

to

prevent

interference

between

individua!

components.

e

A

glass

epoxy

circuit

board

In

keeping

with

our

aim

of

making

the

cabinet

sturdy

and

rigid,

we

have

also

used

a

glass

epoxy

circuit

board

for

the

printed

board

of

the

Kenwood

L-A1

amplifier.

Glass

epoxy

offers

excellent

characteristics

and

lasts

for

years.

And

as

a

material,

glass

offers

better

rigidity

than

the

phenol

resins

normally

used

in

audio

equipment.

As

a

final

touch,

the

board

has

been

firmly

fixed

into

the

frame

with

solid

steel

studs.

Other

features

@

MC/MM

dual-head

equalizer

Phono

cartridges

come

in

either

MM

or

MC

types.

To

make

the

best

of

both,

the

Kenwood

L-A1

uses

a

dual-head

equalizer.

Although

dual

head

equaliz-

ers

are

gain-switching

equalizer

amplifiers,

by

of-

fering

a

dedicated

first-stage

for

MM

and

MC

circuits,

they

give

you

all

the

benefits

of

a

dedi-

cated

equalizer

amplifier.

®

Quality

machined

and

extruded

parts

All

parts,

such

as

panels,

knobs

and

jacks,

etc.

have

been

either

precision-machined

or

extruded

to

give

you

sure

contro!

and

the

high

degree

of

reliability

you

need.

How

to

set

up

your

new

amplifier

Connect

your

equipment

to

the

amplifier

as

shown

in

the

diagram

below.

Please

read

the

individual

instruction

manuals

for

all

equipment

being

connected

to

the

amplifier.

Do

not

plug

in

the

power

until

after

all

connections

have

been

completed.

The

diagram

shows

an

example

of

how

to

connect

components

to

lines

1-3.

Use

this

as

an

example

of

how

to

properly

connect

your

own

equipment.

Digital

audio

tape

(DAT)

1

or

Digital

audio

tape

(DAT)

2

or

cassette

tape

deck

1

cassette

tape

deck

2

Tuner

(>

—_leZ)

Record

player

GND

(ground)

terminal

Balance

input

terminals

?

For

connection

to

wall

socket

CD

player

@

PHONO

terminal

shorting

pins

When

the

PHONO

terminal

is

not

used,

connect

the

attached

shorting

pins

to

the

PHONO

terminal.

Do

not

For

BS

terminals

or

other

devices

connect

the

pins

to

the

REC

terminal.

Speaker

(right)

Speaker

(left)

A

message

from

the

laboratory

The

‘L’

in

the

name

‘L-A1’

stands

for

laboratory.

This

is

a

mark

assigned

to

only

the

most

superbly

engineered

Kenwood

products,

and

it

has

been

a

mark

of

pride

since

our

founding.

Long

years

of

technological

expertise

have

gone

into

the

making

of

the

L-A1,

together

with

the

very

finest

of

materials,

making

the

L-A1

the

very

personification

of

Kenwood

quality.

AC

outlet

for

U.K.

Caution

=

When

using

the

AC

outlet

equipped

with

this

[ea]

unit,

be

sure

to

consult

your

dealer

for

the

corresponding

plug.

e

External

power

socket

SWITCHED

socket

(capacity

of

200W):

Plugs

for

the

tuner,

cassette

tape

deck,

record

player,

CD

player

and

other

equipment

may

be

inserted

into this

socket

so

that,

if

the

POWER

switch

for

each

of

the

individual

com-

ponents

is

left

on,

then

the

components

may

be

turned

on

and

off

simply

by

turning

on

the

POWER

switch

of

the

main

unit.

Under

no

circumstances

should

devices

totaling

over

200W

be

connected.

The

balance

input

terminals

TT

The

GND

(ground)

terminal

The

GND

cord

of

the

record

player

should

be

connected

here.

The

balance

terminals

provide

a

professional

connection

method

for

use

at

broadcast

sta-

tions

and

in

other

professional

applications.

These

terminals

may

be

used

for

connecting

any

equipment

with

output

balance

terminals.

To

connect

your

equipment,

use

either

com-

mercially

available

cables

or

the

Canon

ca-

bles

that

come

with

your

equipment.

The

end

of

the

Canon

cable

without

a

lock

switch

is

the

end

which

should

be

connected

to

the

input

terminal

(i.e.,

balance

terminal)

of

the

am-

plifier.

To

remove

the

input

terminal

from

the

am-

plifier,

press

the

terminal

release

lever

while

removing

the

plug.

b=

¢

Insert

the

connecting

cords

firmly

into

their

sockets.

Inserting

these

cords

loosely

may

result

in

noise

or

the

loss

of

sound

altogether.

e

When

inserting

or

removing

the

connecting

cords,

aiways

be

sure

to

first

remove

the

power

cord

from

its

socket.

Inserting

of

removing

the

connection

cords

with

the

power

cord

in

its

socket

may

result

in

the

faulty

operation

of

or

damage

to

the

amplifier.

¢

Donot

connect

any

equipment

with

specified

power

requirements

in

excess

of

the

maximum

power

displayed

above

the

socket

on

the

rear

of

the

unit.

How

to

connect

the

speakers

Connect

the

speakers

in

such

a

way

that

the

core

of

the

wire

does

not

come

into

contact

with

any

terminal

other

than

the

speaker

terminal.

Prepare

the

wire

for

Loosen

the

é

Ei

Insert

the

speaker

connection.

terminal

cap.

EB

Tighten

the

wire.

terminal

cap.

20mm

=

a

/

my,

(SLI

ae.

g

X

SX

(Remove

the

covering

to

expose

the

core

of

the

wire.)

Speaker

impedance

Use

speakers

with

an

impedance

from

4

to

16

Q.

Under

no

circumstances

should

you

use

speakers

with

an

impedance

less

than

4

Q.

°

Crossing

the

jeft

and

right

terminals,

or

inserting

the

plus

and

minus

terminals

incorrectly

may

result

in

muddled

sound

where

instruments

cannot

be

heard

clearly,

or

in

an

unnatural,

monotone

sound.

Please

be

sure

to

connect

the

speaker

wires

correctly.

¢

Do

not

cross

the

plus

and

minus

(+

or

-)

or

left

and

right

(L

or

R)

terminals

when

connecting

the

speaker

cords.

Names

of

parts

ON/STAND

BY

indicator

VOLUME

CONTROL

knob

Pressing

the

POWER

key

causes

this

indicator

to

flash

for

approximately

5

seconds,

after

which

it

enters

the

ON

state

Remote

control

Spotlight

signal

detector

SOURCE

indicator

The

red

indicator

lights

up

in

INPUT

mode;

The

orange

indicator

lights

up

in

REC

OUT

mode;

When

all

indicators

are

off,

the

amplifier

is

in

REC

OUT

OFF

mode,

and

no

recording

may

be

done.

Vvouwume|

conTRoL

PHONES

jack

MUTING

key

/

indicator

INPUT/REC

OUT

switching

key

/

REC

OUT

indicator

POWER

key

SPEAKERS

OFF

key

/

indicator

CARTRIDGE

MM/MC

key

/

MC

indicator

SOURCE

selector

knob

A

message

from

the

laboratory

Class

A

operation

of

the

driver

stage

The

power

amplification

stage

of

most

amplifiers

have

class

B

operation.

But

in

the

Kenwood

L-A1,

in

order

to

fully

drive

the

finai

transistors,

we've

designed

the

previous

drive

stage

to

have

class

A

operation

even

under

a

load

of

only

4

Q.

This

reduces

the

actual

amount

of

distortion

in

the

power

amplification

stage

to

levels

never

before

realized,

and

allows

you

to

enjoy

clear,

dynamic

sound

like

never

before.

Stand

by

mode

of

POWER

switch

When

the

power

cord

of

this

system

is

plugged

into

an

AC

outlet,

the

STAND

BY

indicator

lights

up

regardless

of

the

ON/OFF

setting

of

the

POWER

switch.

This

indicates

that

a

small

amount

of

current

is

being

supplied

to

the

unit

to

back

up

the

memory

contents.

This

mode

is

referred

to

as

the

Stand

By

mode.

While

the

STAND

BY

indicator

is

lit,

the

power

of

the

system

can

be

switched

ON/OFF

from

the

remote

control

unit.

Speaker

protection

circuits

When

the

ON/STAND

BY

indicator

begins

flashing

rapidly,

it

means

that

the

plus

(+)

and

minus

(-)

polarity

of

the

speakers

has

been

short-circuited.

If

this

happens,

press

the

POWER

key

to

turn

off

the

power,

reverse

the

speaker

connections,

and

press

the

POWER

key

to

turn

on

the

power

once

again.

The

amplifier

should

then

return

to

normal

operation.

10