Kenwood KM-991 User manual

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GOO/ANS>)|

STEREO

POWER

AMPLIFIER

KM-991

INSTRUCTION

MANUAL

KENWOOD

CORPORATION

338-00

GD

(

_Y)[GA]

Introduction

PT

Your

choice

of

this

product

indicates

that

you

are

a

devotee

to

excellence

in

sound

reproduction.

We

appreciate

your

patronage

and

take

pride

in

the

long

tra-

dition

of

quality

components

that

our

company

represents.

So

that

you

can

get

the

most

out

of

your

unit,

we

suggest

that

you

take

the

time

to

read

through

this

manual

before

you

hook

up

and

operate

your

system.

This

will

acquaint

you

with

operating

features

and

system-connection

consid-

erations

so

that

your

listening

pleasure

will

be

enhanced

right

from

the

start.

You

will

notice

that

in

ail

aspects

of

planning,

engineering,

styling,

operating

convenience

and

adaptability

we

have

sought

to

anticipate

your

needs

and

desires.

Accessory

Keep

this

manual

handy

for

future

reference.

AC

plug

adaptor

For

your

records

(except

for

some

areas)

Record

the

serial

number,

found

on

the

back

of

the

unit,

in

For

the

unit

with

a

European

AC

the

spaces

designated

on

the

warranty

card,

and

in

the

plug

in

areas

other

than

Europe.

space

provided

below.

Refer

to

the

model

and

serial

num-

bers

whenever

you

call

upon

your

dealer

for

information

or

service

on

this

product.

Model__________—___

Serial

Number

Unpacking

Unpack

the

unit

carefully

and

make

sure

that

all

accessories

are

put

aside

so

they

will

not

be

lost.

Examine

the

unit

for

any

possibility

of

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

that

you

retain

the

original

carton

and

pack-

ing

materials

for

use

should

you

transport

or

ship

the

unit

in

the

future.

Conte

nts

Caution:

Read

the

pages

marked

A

carefully

©

ensure

safe

operation.

Introduction

Controls

and

indicators

A.

Before

applying

power

Operating

instructions

A

Safety

precautions

Listening

to

the

program

source

A

IMPORTANT

SAFEGUARDS

Listening

through

headphones

System

connections

POWER

LEVEL

METER

To

AC

outlets

In

case

of

difficulty

Connection

of

speakers

AY

Specifications

Setting

the

SPEAKER

IMPEDANCE

SELECTOR

2

=

KM-991

(En)

A\

Caution:

Read

this

page

carefully

to

ensure

safe

operation.

Before

applying

power

Seen

eee

eee

ee

nace

cece

For

the

U.S.A.

and

Canada

Important!

Units

shipped

to

the

U.S.A.

and

Canada

are

designed

for

opera-

tion

on

120

volts

AC

only.

CAUTION:

To

PREVENT

ELECTRIC

SHOCK

DO

NOT

USE

THE

AC

PLUG

WITH

AN

EXTENSION

CORD,

RECEPTACLE

OR

OTHER

OUTLET

UNLESS

THE

BLADES

CAN

BE

FULLY

IN-

SERTED

TO

PREVENT

BLADE

EXPOSURE.

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:

;

Neutral

The

wires

in

this

mains

lead

must

be

connected

to

the

termi-

nals

in

the

plug

as

follows:

Wire

colour

Piug

terminal

marking

N

or

Black

Brown

to

Live

Blue

to

Neutral

*

)

Plug

Notes:

1.

If

a

13-amp

plug

is

used,

this

must

be

fitted

with

a

5-amp

fuse.

2.

If

a

3-pin

plug

with

earthing

contact

is

used,

no

wire

must

be

connected

to

the

E

terminal.

Safety

precautions

For

Australia

and

Europe

Important!

Units

shipped

to

Australia

are

designed

for

operation

on

240

V

AC

only.

Units

shipped

to

Europe

are

designed

for

operation

on

230

V

AC

only.

For

other

countries

Important!

Units

shipped

to

countries

other

than

the

above

countries

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

out-

let,

make

sure

that

the

setting

position

of

this

switch

matches.

your

line

voltage.

If

not,

it

must

be

set

to

your

voltage

in

ac-

cordance

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.

AC

voltage

selector

switch

—-

<—

AC110-

120V

~

AC220V~

AC240V~

_

mall

AC110V-

<<»

AC220V-

120V~

240V

~

Move

switch

lever

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

MOISTURE.

CAUTION

Wo

SAGER

CAUTION:

TO

REDUCE

THE

RISK

OF

ELECTRIC

SHOCK,

DO

NOT

REMOVE

COVER

(OR

BACK).

NO

USER-SERVICEABLE

PARTS

INSIDE,

REFER

SER-

1

OVEN

VICING

TO

QUALIFIED

SERVICE

PERSONNEL.

THE

LIGHTNING

FLASH

WITH

ARROWHEAD

SYMBOL,

WITHIN

AN

EQUILATERAL

TRIANG

LE,

IS

INTENDED

TO

ALERT

THE

USER

TO

THE

PRESENCE

OF

UNINSULATED

‘‘DANGEROUS

VOL-

TAGE”

WITHIN

THE

PRODUCT'S

ENCLOSURE

THAT

MAY

BE

OF

SUFFICIENT

MAGNITU

DE

TO

CONSTITUTE

A

RISK

OF

ELECTRIC

SHOCK

TO

PERSONS.

THE

EXCLAMATION

POINT

WITHIN

AN

EQUILATERAL

TRIANGLE

IS

INTENDED

TO

ALERT

THE

USER

TO

THE

PRESENCE

OF

IMPORTANT

OPERATING

AND

MAINTENANCE

(SERVICING)

IN-

STRUCTIONS

IN

THE

LITERATURE

ACCOMPANYING

THE

APPLIANCE.

KM-991

(En)

3

IMPORTANT

SAFEGUARDS

Please

read

ail

of

the

safety

and

operating

instructions

before

operating

this

unit.

For

best

results,

follow

all

warnings

placed

on

the

unit

and

adhere

to

the

operat-

ing

and

use

instructions.

These

safety

and

operating

in-

structions

should

be

retained

for

future

reference.

1.

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.

2.

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.

Never

pull

or

stretch

the

cord.

3.

Grounding

or

polarization

—

The

precautions

should

be

taken

so

that

the

grounding

or

polariza-

tion

means

of

this

unit

is

not

defeated.

4.

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.

5.

Water

and

moisture

—

The

unit

should

not

be’

used

near

water

—

for

example,

near

a

bathtub,

washbowl,

kitchen

sink,

laundry

tub,

in

a

wet

base-

ment,

or

near

a

swimming

pool,

etc.

6.

Temperature

—

The

unit

may

not

function

pro-

perly

if

used

at

extremely

low,

or

freezing

tempera-

tures.

The

ideal

ambient

temperature

is

above

+5°C

(47°F).

4

kM-991

(En)

A\

Caution

:

Read

this

page

carefully

to

ensure

safe

operation.

7.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

ob-

jects

do

not

fall

and

liquid

is

not

spilled

into

the

en-

closure

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.

9.Enclosure

removal

—

Never

remove

the

en-

closure.

If

the

internal

parts

are

touched

accidentally,

a

serious

electric

shock

might

occur.

10.

Magnetic

fields

—

Keep

the

unit

away

from

sources

of

magnetic

fields

such

as

TV

sets,

speaker

systems,

radios,

motorized

toys

or

magnetized

objects.

11.

Cleaning

—

Do

not

use

volatile

solvents

such

as

alcohol,

paint

thinner,

gasoline,

or

benzine,

etc.

to

clean

the

cabinet.

Use

a

clean

dry

cloth.

12.

Carts

and

stands

—

An

appliance

and

cart

com-

13.

14.

15.

16

17

bination

should

be

moved

with

care.

Quick

stops,

excessive

force,

and

uneven

surfaces

may

cause

the

appliance

and

cart

combination

to

overturn.

LA

——

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

—

|f

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.

POWER

OFF!

Damage

requiring

service

—

The

unit

should

be

serviced

by

qualified

service

personnel

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

E.

The

unit

has

been

dropped,

or

the

enclosure

damaged.

Servicing

—

The

user

should

not

attempt

to

ser-

vice

the

unit

beyond

that

described

in

the

operating

instructions.

All

other

servicing

should

be

referred

to

qualified

service

personnel.

Outdoor

antenna

grounding

—

If

an

outside

an-

tenna

is

connected

to

the

receiver,

be

sure

the

an-

tenna

system

is

grounded

so

as

to

provide

some

protection

against

voltage

surges

and

built

up

static

charges.

Section

810

of

the

National

Electrical

Code,

ANSI/

NFPA

No.

70—1984,

provides

information

with

respect

to

proper

grounding

of

the

mast

and

supporting

structure,

grounding

of

the

lead-in

wire

to

an

antenna

discharge

unit,

size

of

grounding

con-

A

Caution

:

Read

this

page

carefully

to

ensure

safe

operation.

ductors,

location

of

antenna-discharge

unit,

connec-

tion

to

grounding

electrodes,

and

requirements

for

the

grounding

electrode.

See

Figure.

EXAMPLE

OF

ANTENNA

GROUNDING

AS

PER

NATIONAL

ELECTRICAL

CODE

ANTENNA

GROUND

ANTENNA

DISCHARGE

UNIT

(NEC

SECTION

810-20)

ELECTRIC

RVICE

(NEC

SECTION

810-21)

GROUND

CLAMPS

POWER

SERVICE

GROUNDING

ELECTRODE

SYSTEM

NEC

—

NATIONAL

ELECTRICAL

CODE

(NEC

ART

250,

PART

H)

18.

Power

lines

—

An

outdoor

antenna

should

be

lo-

cated

away

from

power

lines.

19.

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.

Notes:

a

1,

Item

3

is

not

required

except

for

grounded

or

polarized

equipment.

2.

Item

17

and

18

are

not

required

except

for

units

provided

with

antenna

terminals.

3.

ftem

17

complies

with

UL

in

the

U.S.A.

KM-99°8

(En)

5

System

connections

Make

connection

as

shown

below.

When

connecting

the

related

system

components,

refer

also

to

the

instruction

manuals

of

the

related

components.

Do

not

plug

in

the

power

lead

until

all

connections

are

completed.

Control

amplifier

KC-991

ALD110-120V

/AC220-240V~

50/60rz

‘SWITCHED:

‘TOTAL

SBOW

MAX.

O

|

%

eenren

|

Rear

ieg

SPEAKER

IMPEDANCE

SELECTOR

(Except

for

some

areas.)

To

AC

outlet

Power

amplifier

KM-991

AC

410V-

are=

AC

220V-

421

240v~

AC

voltage

selector

switch

Unswitched

AC

outlets

(Except

for

some

areas.)

To

AC

outlet

i

inati

UNSWITCHED

AC

outlet

ence

Shape

of

the

AC

outlet

The

power

of

the

component

connected

to

this

For

U.S.A.,

Canada

ini

=

AC

aye

=

be

switched

ON/OFF

reg

ard-

and

U.S.

Military

ess

of

the

ER

key

on

the

main

unit.

For

other

countries

Notes:

1.

Connect

all

cords

firmly.

if

connections

are

loose

there

could

be

loss

of

sound

or

noise

produced.

2.

When

plugging

and

unplugging

connection

cords,

be

sure

to

first

remove

the

power

cord

from

the

AC

outlet.

Plugging/unplugging

corsnec-

tion

Cords

without

removal

of

the

power

cord

can

cause

malfunctions

or

damage

to

the

unit.

3.

Do

not

connect

up

a

power

source

which

is

larger

than

that

indicated

on

the

socket

at

the

rear

of

the

unit.

6

kM991

(En)

Connection

of

speakers

@®

Push

the

lever

up.

Speaker

system

A

®

Insert

the

cord.

@

Lock

the

lever.

Never

short-circuit

the

+

and

-

speaker

cords.

If

the

left

and

right

speakers

are

connected

inversely

or

if

the

speaker

cords

are

connected

with

reversed

polarity,

the

sound

becomes

unnatural

with

ambiguous

acoustic

image

posi-

tioning.

Be

sure

to

connect

the

speakers

and

Speaker

speaker

cords

correctly.

system

B

™@

Setting

the

SPEAKER

IMPEDANCE

SELECTOR

(Except

for

some

areas)

According

to

the

impedance

of

the

speakers

used,

set

_

the

SPEAKER

IMPEDANCE

SELECTOR

on

the

rear

panel

as

shown

in

the

table.

Speaker

Impedance

Selector

position

"LESS

THAN

8.2"

82,

162

“8

Q

OR

MORE"

@

During

speaker

system

connection

and

operation

of

the

SPEAK-

ER

IMPEDANCE

SELECTOR,

set

the

POWER

key

to

OFF.

@

When

only

one

set

of

speakers

is

used,

use

tne

SPEAKER

A

terminals.

CC®

@

Even

when

only

one

of

speaker

systems

A

and

B

uses

4Q.

or

eS

Finnie.

cle

6Q

speakers,

be

sure

to

set

the

SPEAKER

IMPEDANCE

a

on

Mone

SELECTOR

to

“LESS

THAN

8

Q”.

Speaker

protection

circuit

;

if

the

POWER

switch

of

this

unit

is

turned

on

with

the

speaker

cord

short-circuited,

the

speaker

protection

circuit

will

be

activated

automatically

and

no

sound

will

be

output.

In

this

case,

remove

the

short

circuit

of

the

speaker

cord

and

then

turn

the

POWER

switch

on

again

to

restore

normal

operation.

kmog1

4en)

7

Controls

and

indicators

POWER

SPEAKERS

A/B

POWER

LEVEL

switch

switches

METER

Headphones

jack

POWER

INDICATOR

METER

RANGE

(PHONES)

,

knob

SPEAKERS

A

and

B

switches

A,B

OFF

—

This

position

silences

all

speakers

to

permit

private

use

*

SPEAKERS

5

of

headphones.

:

AON

—

Activates

speakers

connected

to

the

SPEAKERS

A

ter-

(C—F

ic

minals

on

the

rear

panel.

BON

—

Activates

the

speakers

connected

to

the

SPEAKERS

B

terminals

on

the

rear

panel.

A,BON

—

Activates

the

speakers

connected

to

the

SPEAKERS

A

and

B

terminals

simultaneously.

@

When

speakers

are

connected

only

to

the

SPEAKERS

A

termi-

nals,

the

sound

will

not

be

heard

if

both

the

SPEAKERS

A

and

B

switches

are

depressed

to

the

ON

position.

8

ki-9¢1

(En)

Operating

instructions

Mi

Listening

to

a

program

source

1

Switch

the

power

on.

Select

an

input

source

on

the

control

amplifier.

@

The

audio

signal

of

that

source

will

be

input

from

the

con-

trol

amplifier

connected

to

this

unit.

Adjust

the

volume

on

the

control

amplifier.

@

The

output

level

is

displayed

on

the

POWER

LEVEL

METER.

Adjust

the

tone

on

the

control

amplifier.

POWER

LEVEL

METER

Listening

through

headphones

Insert

the

headphone

plug

into

the

headphones

jack.

PHONES:

©

@

Set

the

SPEAKERS

switch

so

that

both

speaker

systems

A

and

B

are

OFF.

2

Adjust

the

volume

on

the

control

amplifier.

@

Be

sure

to

minimize

the

volume

before

unplugging

the

headphone

plug.

The

POWER

LEVEL

METER

can

display

the

output

power

level

up

to

200

watts.

However,

it

is

rather

rare

that

you

play

music

at

such

nigh

lev-

els

as

50

or

200

watts

at

your

home.

In

usual

cases,

the

meter

sensitivity

can

be

boosed

by

ten

times

to

display

the

level

more

finely.

Set

the

METER

RANGE

knob

to

the

x0.1

position.

METER

RANGE

x09

x4

Levels

from

0.01

watt

to

200

watts

can

be

displayed.

To

return

to

the

normal

sensitivity,

set

the

switch

to

the

x1

posi-

tion.

The

POWER

LEVEL

METER

displays

the

levels

from

0.4

to

200

watts

assuming

that

the

speaker

impedance

is

8

ohms.

If

the

impedance

of

your

speakers

is

other

than

8

ohms,

the

POWER

LEVEL

METER

may

not

display

correct

values.

KM-991

(En)

9

In

case

of

difficulty

What

appears

to

be

a

malfunction

may

not

always

be

serious.

If

your

unit

should

not

perform

as

expected,

consult

the

table

below

to

see

if

the

problem

can

be

corrected

before

seeking

help

from

your

dealer

or

service

representative.

Sympiom

Ceuse

Power

is

on

but

no

sound.

@

Poor

connection

at

wall

outlet.

Power

outlet

(Indicator

is

off.)

inactive.

®

Check

outlet

using

a

lamp

or

other

appli-

ance

(outlet

may

be

controlled

by

a

wall

switch).

@

Turn

the

POWER

switch

OFF,

identify

and

remove

the

cause,

and

turn

the

POWER

switch

ON

again.

@

Protection

circuitry

operating.

Sound

is

not

output.

(Indicator

lights.)

@

The

speaker

cords

are

disconnected.

@

Connect

them

properly

referring

to

“System

connections”.

@

Adjust

the

control

amplifier's

volume

to

a

proper

level.

@

Check

speaker

switch.

@

Turn

the

power

off,

eliminate

the

short

circuiting,

then

turn

on

the

power

again.

@

The

VOLUME

is

set

to

the

minimum

position.

@

Speaker

switched

off.

@

Speaker

cords

are

short-circuited.

@

Audio

cords

are

short-circuited.

Sound

is

not

output

from

one

of

the

speakers.

@

The

speaker

cord

is

disconnected.

@

Connect

it

properly

referring

to

“System

connections”.

@

Adjust

the

Left/Right

balance.

@

The

BALANCE

control

is

set

to

an

extreme

position.

Note:

Do

not

use

contact

cleaners

because

it

could

cause

a

malfunction.

Be

specially

careful

against

contact

cleaners

containing

oil,

for

they

may

deform

the

plastic

components.

10

kN4-991

fn}