Yamaha MX-70 User manual

UTEN]I

DELL’

MANUALE

SNING

ANVI

BRUKS

BEDIENUNGSANLEITUNG

MODE

D'EMPLOI

S

MANUAL

3

OWNER

English

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

Francais

Deutsch

..........

Svenska

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

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1

Front

Panel

Illustration

ion

8

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3

Diagramma

di

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“0

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0

32

Thank

you

for

purchasing

the

YAMAHA

MX-70

stereo

power

amplifier.

or

0

FE

a

EPA

ฟี

|

e

r

E

6

พ

|

29

qe

=

ve

d

Ey

Dri?

Bs

&

E

ou:

|

í

To

obtain

the

finest

performance

from

your

new

power

amplifier,

please

read

this

manual

carefully,

keeping

it

handy

for

future

reference.

After

you

know

which

PRECAUTIONS

to

take,

the

section

CON-

NECTIONS

will

show

you

how

to

hook

up

the

MX-70

to

your

control

amplifier

and

speakers.

Operation

of

this

power

amplifier

is

explained

under

FRONT

PANEL

CONTROLS

AND

THEIR

FUNCTIONS.

If

you

have

any

trouble,

the

final

section

on

TROUBLESHOOTING

tells

you

what

to

do

before

contacting

your

YAMAHA

dealer.

FA

OES.

1

ฝ

1

็

0

1

PRECAUTIONS

kan

้

เ

'

2

ler

4

AAA

พ

ด

assisted

5

TROUBLESHOOTING

|...

SE,

SPEGIFICATIONS

ss

u

daidi

T

IMPORTANT:

Please

record

the

serial

number

of

your

unit

in

the

space

below.

Model:

MX-70

Serial

No.:

WM

Hyperbolic

Conversion

Amplification

Circuit

EB

Advanced

Power

Supply

(APS)

Circuitry

=E

Three-Pair

Speaker

Support

ณี

|

LCD

(Liquid

Crystal

Display)

Power

Level

Meters

=

Overload

Protection

Circuitry

Hyperbolic

Conversion

Amplification

Circuit

This

new

kind

of

circuitry,

developed

by

Yamaha,

eliminates

the

only

serious

drawback

of

A

operation

amplifiers.

These

had

to

switch

to

non-linear

class

AB

operation

above

a

certain

load

current,

causing

a

slight

deterioration

in

the

otherwise

excellent

sound

quality.

The

new

Hyperbolic

Conversion

Amplification

Circuit

does

away

with

this

problem,

allowing

your

Yamaha

MX-70

to

deliver

superior

performance

constantly,

without

switching

or

cut-off,

over

its

entire

power

range.

Advanced

Power

Supply

Circuitry

(APS)

An

amplifier

is

only

as

good

as

its

power

supply

—

this

simple

truth

has

prompted

Yamaha

to

develop

the

APS

circuitry

incorporated

in

your

new

MX-70.

The

problem

with

conventional

power

sources

was

their

tendency

to

produce

pronounced

voltage

ripples

during

medium

to

large

amplitude

music

signals,

particularly

under

low

impedance

loads,

together

with

voltage

fluctuations

in

the

power

transistors.

APS

solves

this

problem

by

providing

an

active

power

source

that

|

ensures

stable

voltage

in

the

final

transistor

stage

under

all

operating

conditions,

thus

greatly

improving

power

supply

to

the

amplifier.

PRECAUTIONS

|

Keep

this

manual

in

a

sale

war

for

futura

reference.

_

LOCATION

_

-

El

Relocation

Before

moving

your

amplifier,

be

sure

to

-

unplug

the

power

cord

and

remove

all

other

connecting

cables.

Avoid

0

your

MX-70

in

direct

TT

or

close

to

a

source

of

heat.

Also

avoid

lo-

cations

in

which

the

device

is

likely

to

be

subjected

to

excessive

dust,

cold

or

mois-

ture.

VENTILATION

_

The

openings

on

the

cabinet

ensure

ha

ventilation

of

the

amplifier.

lf

these

openings

are

obstructed,

the

temperature

inside

the

cabinet

will

rise

rapidly

and

eventually

damage

the

circuits.

Therefore,

avoid

plac-

ing

objects

against

these

openings

and

do

not

install

your

amplifier

in

a

place

such

that

the

flow

of

air

through

the

ventilation

openings

could

be

impeded.

=|

Power

cord

When

removing

the

power

plug

from

the

wall

outlet,

always

pull

directly

on

the

plug.

Never

yank

the

cord

as

this

may

result

in

damage

to

the

cord

and

possibly

a

short-circuit.

If

you

do

not

intend

to

use

this

unit

for

an

extended

period

of

time,

it

is

advisable

to

unplug

the

power

cord.

HH

Switches

and

knobs

void

applying

excessive

force

to

the

switches

and

knobs.

E

Troubleshooting

Chart

Consultthe

Troubleshooting

Chartfor

advice

on

the

common

operation

errors

before

concluding

that

your

amplifier

is

faulty.

E

Servicing

Do

not

open

the

cabinet

or

attempt

to

make

repairs

by

yourself,

as

this

may

aggravate

the

damage

and

expose

you

to

an

electrical

shock.

Æ

Object

and

liquid

entry

See

to

itthat

foreign

objects

or

spilled

liquids

do

not

enter

inside

the

cabinet.

Should

this

case

arise,

consult

your

YAMAHA

dealer.

|

Wipe

off

dust

with

a

dry

soft

cloth.

To

remove

dirt

or

fingermarks,

use

a

soft

damp

cloth

then

dry

immediately

with

a

clean

cloth.

Do

not

use

alcohol,

thinners

or

other

chemical

solvents

since

they

may

damage

the

finish

or

remove

the

panel

lettering.

|

Do

not

use

any

aerosol

sprays

near

this unit

as

these

products

can

easily

get

into

the

unit

and

damage

the

circuitry.

Special

instructions

for

the

U.K.

THE

WIRES

IN

THE

MAINS

LEAD

ARE

COLOURED

IN

ACCORDANCE

WITH

THE

FOLLOWING

CODE:

Blue:

NEUTRAL

Brown:

LIVE

As

the

colours

of

the

wires

in

the

mains

|

lead

ofthis

apparatus

may

not

corresponc

with

the

coloured

markings

identifying

the

terminals

in

your

plug,

proceed

as

follows

The

wire

which

is

coloured

BLUE

must

be

connected

to

the

terminal

which

is

markec

with

the

letter

N

or

coloured

BLACK.

The

wire

which

is

coloured

BROWN

must

be

connected

to

the

terminal

which

is

markec

with

the

letter

L

or

coloured

RED.

FRONT

PANEL

ILLUSTRATION

ABBILDUNG

DER

VORDERSEITE

-ILLUSTRAZIONE

DEL

PANNELLO

ANTERIORE

ILLUSTRATION

DU

PANNEAU

AVANT

ILLUSTRATIONEN

PÅ

FRAMSIDAN

|

—

800

===

Pruz

๑

—

|

—

200

SEE

o

SEE

20m

—

YAMAHA

natura

souno

ipo

er

en

STEREO

POWER

AMPLIFIER

MX-70

--

æ

SS

eg

-EE

e

—

'

—s

se

--

==:

58

=

-20

=

2

—

as

=

-25

=

os

—

Oe

—

=30

=

a2

—

008

-—=—

88

==

ans

—

ace

SE

=42

=

oue

—

;

~~

Dans

—

==

000

—

ป

ลุ

ค

LEVEL

Il]

SPEAKERS

l

E

p

8

=

4

ว

E

c

10

,

‘

3

PA

i

;

x

fas

ho

เพ

ส

ต

แล

ม

ด

15

|

UFF

&

OFF

a

DEF

Pe

ON

เอะ

ON

=

aN

๐

-gü

D

Hyperbolic

Conversion

Amplification

Circuit

(5)

LOAD

selectors:

These

three

switches

let

you

adjust

the

peak

|

The

Front

Panel

illustration

is

provided

on

page

3.

|

.

GD

POWER

switch

and

indicator:

Pressing

this

switch

turns

power

on,

causing

the

POWER

indicator

to

light.

To

turn

the

unit

off,

press

again.

@

SPEAKERS

selectors:

Allow

you

to

select

any

of

the

speaker

pairs

connected

to

the

A,

B

and/or

C

terminals

by

pushing

the

ap-

propriate

switch(es)

to

the

ON

position.

NOTE:

___—_—

—çć—

lf

speakers

are

connected

to

terminals

B,

but

not

to

terminals

C,

be

sure

to

press

only

the

B

SPEAKERS

selector

when

listening

via

pair

B.

Pushing

in

selector

C

as

well

will

cut

off

the

sound

from

pair

B

since

B

and

C

are

connected

in

series.

(The

same

holds

true

if

speakers

are

connected

to

C

and

selector

B

is

pressed.)

€)

PROTECTION

indicator:

Lights

for

several

seconds

after

power

-

is

turned

on,

showing

that

the

internal

protection

circuitry

is

currently

activated.

This

mutes

the

output

signal

to

the

speakers,

preventing

the

loud

noise

otherwise

heard

when

switching

on

the

amplifier.

E)

METER

switch:

Switches

the

power

peak

meter

OFF.

(This

power

display

is

not

illuminated

when

the

METER

switch

is

pressed

in.)

©

Power

peak

meter:

indicates

the

power

output

on

a

logarithmically

compressed

scale

from

0.002

to

600 watts

(—

50

to

+

5dB),

in-

dependently

for

the

left

and

right

output

channels.

Readings

are

accurate

for

the

load

determined

by

the

LOAD

selectors.

power

display

according

to

the

speaker

load

impedance.

Whe

using

more

than

one

pair

of

speakers

at

the

same

time,

you

cé

=

work

out

their

combined

impedance

with

the

following

formula

where

X

and

Y

are

the

impedance

values

of

each

speaker

pai

1)

2

pairs

in

parallel

(A+B

or

A+C)

(Xx

Y)

/

(X

+

Y)

=

combined

impedance

Example

for

2

pairs

of

8

ohm

speakers:

(8x8)/(8

+

8)

=

4ohms

2)

2

pairs

in

series

(B+C)

X

+

Y

=

combined

impedance

3)

3

pairs

(A+B+C)

~

Same

formula

as

1),

with

A=X

and

(B+C)=

if

the

combined

impedance

does

not

correspond

exactly

to

or

of

the

three

LOAD

seitings,

select

the

closest

one.

@

LEFT

and

RIGHT

LEVEL

controls:

These

give

you

independent

control

over

the

power

output

levels

to

the

L

and

R

speakers

This

allows

you

to

preset

speaker

balance

for

optimum

stere

imaging.

These

controls

can

also

serve

to

protect

speakers

with

power

handling

capacity

lower

than

this

amplifier’s

rate

output.

|

The

connection

diagram

is

provided

on

page

32.

|

@

CONTROL

AMPLIFIER

(Y

SPEAKERS

A

($)

SPEAKERS

B

E)

SPEAKERS

C

Make

sure

the

left

(L)

and

right

(R)

channels

are

connected

consist-

ently

between

components.

NOTE:

ee

Before

making

or

altering

any

of

the

connections

described

below,

be

sure

to

turn

off

the

power

of

the

MX-70.

Making

sure

that

the

contro!

amplifier

is

also

turned

off,

connect

the

outputjacks

of

your

control

amplifier

to

the

corresponding

INPUT

jacks

on

the

rear

panel

of

this

unit.

Always

check

that

a)

the

RCA

plugs

of

the

connecting

cord

are

clean,

b)

the

left

and

right

channels

of

both

units

correspond,

.

c)

connections

are

secure,

and

d)

both

units

are

properly

grounded.

The

MX-70

can

drive

up

to

three

pairs

of

speakers

(A,

Band

C}

at

the

same

time.

Those

connected

to

terminals

A

are

in

parallel

with

pairs

B

and

C,

which

are

in

series.

The

following

table

shows

the

minimum

load

impedances

per

speaker

for

all

possible

connections.

Number

of

=

MX-70

Minimum

speaker

speakers

terminals

load

impedance

1

pair

3

pairs

A+B+C

0

A:

8ohms

B,C:

4

ohms

Be

sure

to

use

only

speakers

within

the

rated

impedance

range

and

with

adequate

power

handling

capacity.

Driving

speakers

with

ex-

tremely

low

impedance

(or

several

low-impedance

pairs

simul-

taneously)

at

continuous

full

power

may

cause

the

protection

circuit

to

activate.

When

connecting

the

speaker

cords,

observe

the

“+”

and

“—”

markings

on

the

backs

of

the

speakers

and

MX-70.

If

the

“+”

and

“—”

polarities

are

reversed,

the

sound

will

be

unnatural

and

lack

bass.

Speaker

cords

should

be

cut

as

short

as

possible.

Do

not

coil

up

excess

cord

or

bundle

it

with

cables

from

other

components.

2

pairs

in

parallel

Strip

approximately

10

mm

(3/8”)

insulation

from

the

ends

of

the

speaker

cords

and

connect

them

as

explained

on

the

A.Light-gauge

Speaker

cords

|

Partly

unscrew

the

plastic

wire

holders.

Insert

the

stripped

ends

of

the

speaker

cords

as

shown

and

retighten

the

holders.

RED

for

(+)

BLACK

for

(—)

|

B.Heavy-gauge

speaker

cords

First,

unscrew

and

remove

the

plastic

wire

holders.

Insert

the

stripped

ends

of

the

speaker

cords

into

the

holders

until

they

protrude

on

the

other

side.

Splay

the

strands

as

shown,

then

screw

the

wire

holders

back

Before

assuming

that

your

amplifier

is

faulty,

check

the

following

list.

If

you

still

have

any

doubts

or

questions,

contact

your

nearest

YAMAHA

dealer.

Lo

Symptom

7

0

2703.

๒

0 อ

๐

ร

น

5

๒

nn

er

N

Remedy

O

ee

No

power

even

when

the

POWER

switch

is

ON.

|

@

The

power

cord

is

nat

plugged

in

securely.

@

Plug

in

securely.

| |

No

sound

is

heard

from

the

left

and/or

right

®

The

speaker

cords

are

not

properly

connected.

@

Check

speaker

connections

and

correct

them.

speaker(s).

@

Either

or

both

LEVEL

controls

are

set

to

—

oodB.

®

Adjust

the

appropriate

LEVEL

control(s).

@

The

cords

from

the

control

amplifier

are

not

secure.

|

@

Connect

them

securely.

@

The

control

amp’s

balance

is

set

to

the

extreme

left

@

Adjust

the

control

amp’s

balance

control.

|

or

right.

| |

The

sound

ceases

suddenly,

and

the

®

The

speaker

protection

circuit

has

activated.

®

Turn

power

OFF,

then

ON

again

to

reset

the

speaker

protection

PROTECTION

indicator

is

lit.

circuit.

Also

see

CONNECTING

SPEAKERS

on

p.

5.

®

There

is

a

malfunction

in

the

amplifier.

®

Consult

your

YAMAHA

dealer.

Unnatural

sound

lacking

bass.

®

The

speaker

polarities

are

reversed.

®

Connect

the

speaker

wires

with

the

correct

+

and

—

polarity.

Minimum

RMS

Output

Power

Per

Channel

intermodulation

Distortion

|

20Hz

~

20kHz

0.003%

THD,

8

ohms

.

170W

Rated

Output/8

onms

0.003%

0.007%

THD,

6

ohms

0

Signal

to

Noise

Ratio

(IHF-A-Network)

|

0

A

20

MAIN

IN

(shorted)

124dB.

Dynamic

Power

Per

Channel

MAIN

IN

(5.1

kQ

terminated)

120d8

(by

IHF

Dynamic

Headroom

measuring

method)

Residual

Noise

(IHF-A-Network)

21uV

8

ohms

I

270W

RR

6

ohms

330W

0

Channel

Separation

4

ohms

440W

Input

shorted,

terminated,

2

ohms

570W

1kHz/10kHz

89dB/72dB

1

ohms

|

600W

Power

Supply

DIN

Standard

Output

Power

Par

Channel

|

Europe

AC220V,

50Hz

1kHz,

1%

THD,

4

ohms

250W

|

U.K.

AC240V,

50Hz

Power

Band

Width

Power

Consumption

1,150W

0.03%

THD

85W,

8

ohms

10Hz

-

60kHz

Dimentions

(W

x

H

x

D)

|

435

x

165

x

425mm

Damping

Band

Width

|

(17-1/8”

x

6-1/2”

x

16-47/64”)

1kHz,

8

ohms

90

Weight

14.5kg

input

Sensitivity/impedance

|

MAIN

IN

| -

1.32V/60kQ

Specifications

subject

to

change

without

notice.

Frequency

Response

|

(20Hz

~

20kHz)

+0,

—0.2dB

Total

Harmonie

Distortions

(20Hz

~

20kHz)

MAIN

IN

to

Sp

Out,

85W/8Q

0.003%

Yamaha MX-70 User manual

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