Yamaha MX-70 Manuale utente

UTEN]I

DELL’

MANUALE

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ANVI

BRUKS

BEDIENUNGSANLEITUNG

MODE

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MANUAL

OWNER

English

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Front

Panel

Illustration

ion

Connection

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“

Thank

you

for

purchasing

the

YAMAHA

MX-70

stereo

power

amplifier.

EPA

ฟี

พ

Dri?

ou:

obtain

the

finest

performance

from

your

new

power

amplifier,

please

read

this

manual

carefully,

keeping

handy

for

future

reference.

After

you

know

which

PRECAUTIONS

take,

the

section

CON-

NECTIONS

will

show

you

how

hook

the

MX-70

your

control

amplifier

and

speakers.

Operation

this

power

amplifier

explained

under

FRONT

PANEL

CONTROLS

AND

THEIR

FUNCTIONS.

you

have

any

trouble,

the

final

section

TROUBLESHOOTING

tells

you

what

before

contacting

your

YAMAHA

dealer.

OES.

ฝ

็

PRECAUTIONS

kan

้

เ

ler

AAA

พ

ด

assisted

TROUBLESHOOTING

|...

SE,

SPEGIFICATIONS

daidi

IMPORTANT:

Please

record

the

serial

number

your

unit

the

space

below.

Model:

MX-70

Serial

No.:

Hyperbolic

Conversion

Amplification

Circuit

Advanced

Power

Supply

(APS)

Circuitry

Three-Pair

Speaker

Support

ณี

LCD

(Liquid

Crystal

Display)

Power

Level

Meters

Overload

Protection

Circuitry

Hyperbolic

Conversion

Amplification

Circuit

This

new

kind

circuitry,

developed

Yamaha,

eliminates

the

only

serious

drawback

Class

operation

amplifiers.

These

had

switch

non-linear

class

operation

above

certain

load

current,

causing

slight

deterioration

the

otherwise

excellent

sound

quality.

The

new

Hyperbolic

Conversion

Amplification

Circuit

does

away

with

this

problem,

allowing

your

Yamaha

MX-70

deliver

superior

performance

constantly,

without

switching

cut-off,

over

its

entire

power

range.

Advanced

Power

Supply

Circuitry

(APS)

amplifier

only

good

its

power

supply

—

this

simple

truth

has

prompted

Yamaha

develop

the

APS

circuitry

incorporated

your

new

MX-70.

The

problem

with

conventional

power

sources

was

their

tendency

produce

pronounced

voltage

ripples

during

medium

large

amplitude

music

signals,

particularly

under

low

impedance

loads,

together

with

voltage

fluctuations

the

power

transistors.

APS

solves

this

problem

providing

active

power

source

that

ensures

stable

voltage

the

final

transistor

stage

under

all

operating

conditions,

thus

greatly

improving

power

supply

the

amplifier.

PRECAUTIONS

Keep

this

manual

sale

war

for

futura

reference.

LOCATION

Relocation

Before

moving

your

amplifier,

sure

unplug

the

power

cord

and

remove

all

other

connecting

cables.

Avoid

your

MX-70

direct

source

heat.

Also

avoid

lo-

cations

which

the

device

likely

subjected

excessive

dust,

cold

mois-

ture.

VENTILATION

The

openings

the

cabinet

ensure

ventilation

the

amplifier.

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

not

install

your

amplifier

place

such

that

the

flow

air

through

the

ventilation

openings

could

impeded.

Power

cord

When

removing

the

power

plug

from

the

wall

outlet,

always

pull

directly

the

plug.

Never

yank

the

cord

this

may

result

damage

the

cord

and

possibly

short-circuit.

you

not

intend

use

this

unit

for

extended

period

time,

advisable

unplug

the

power

cord.

Switches

and

knobs

void

applying

excessive

force

the

switches

and

knobs.

Troubleshooting

Chart

Consultthe

Troubleshooting

Chartfor

advice

the

common

operation

errors

before

concluding

that

your

amplifier

faulty.

Servicing

not

open

the

cabinet

attempt

make

repairs

yourself,

this

may

aggravate

the

damage

and

expose

you

electrical

shock.

Object

and

liquid

entry

See

itthat

foreign

objects

spilled

liquids

not

enter

inside

the

cabinet.

Should

this

case

arise,

consult

your

YAMAHA

dealer.

Wipe

off

dust

with

dry

soft

cloth.

remove

dirt

fingermarks,

use

soft

damp

cloth

then

dry

immediately

with

clean

cloth.

not

use

alcohol,

thinners

other

chemical

solvents

since

they

may

damage

the

finish

remove

the

panel

lettering.

not

use

any

aerosol

sprays

near

this unit

these

products

can

easily

get

into

the

unit

and

damage

the

circuitry.

Special

instructions

for

the

U.K.

THE

WIRES

THE

MAINS

LEAD

ARE

COLOURED

ACCORDANCE

WITH

THE

FOLLOWING

CODE:

Blue:

NEUTRAL

Brown:

LIVE

the

colours

the

wires

the

mains

lead

ofthis

apparatus

may

not

corresponc

with

the

coloured

markings

identifying

the

terminals

your

plug,

proceed

follows

The

wire

which

coloured

BLUE

must

connected

the

terminal

which

markec

with

the

letter

coloured

BLACK.

The

wire

which

coloured

BROWN

must

connected

the

terminal

which

markec

with

the

letter

coloured

RED.

FRONT

PANEL

ILLUSTRATION

ABBILDUNG

DER

VORDERSEITE

-ILLUSTRAZIONE

DEL

PANNELLO

ANTERIORE

ILLUSTRATION

PANNEAU

AVANT

ILLUSTRATIONEN

PÅ

FRAMSIDAN

—

800

===

Pruz

๑

—

200

SEE

20m

—

YAMAHA

natura

souno

ipo

STEREO

POWER

AMPLIFIER

MX-70

-EE

—

—s

==:

-20

—

-25

—

=30

—

008

-—=—

ans

—

ace

=42

oue

—

;

Dans

—

000

—

ป

ลุ

ค

LEVEL

Il]

SPEAKERS

ว

‘

;

fas

เพ

ส

ต

แล

ม

ด

UFF

OFF

DEF

เอะ

๐

-gü

Hyperbolic

Conversion

Amplification

Circuit

(5)

LOAD

selectors:

These

three

switches

let

you

adjust

the

peak

The

Front

Panel

illustration

provided

page

POWER

switch

and

indicator:

Pressing

this

switch

turns

power

on,

causing

the

POWER

indicator

light.

turn

the

unit

off,

press

again.

SPEAKERS

selectors:

Allow

you

select

any

the

speaker

pairs

connected

the

and/or

terminals

pushing

the

ap-

propriate

switch(es)

the

position.

NOTE:

___—_—

—çć—

speakers

are

connected

terminals

but

not

terminals

sure

press

only

the

SPEAKERS

selector

when

listening

via

pair

Pushing

selector

well

will

cut

off

the

sound

from

pair

since

and

are

connected

series.

(The

same

holds

true

speakers

are

connected

and

selector

pressed.)

€)

PROTECTION

indicator:

Lights

for

several

seconds

after

power

turned

on,

showing

that

the

internal

protection

circuitry

currently

activated.

This

mutes

the

output

signal

the

speakers,

preventing

the

loud

noise

otherwise

heard

when

switching

the

amplifier.

METER

switch:

Switches

the

power

peak

meter

OFF.

(This

power

display

not

illuminated

when

the

METER

switch

pressed

in.)

Power

peak

meter:

indicates

the

power

output

logarithmically

compressed

scale

from

0.002

600 watts

(—

5dB),

in-

dependently

for

the

left

and

right

output

channels.

Readings

are

accurate

for

the

load

determined

the

LOAD

selectors.

power

display

according

the

speaker

load

impedance.

Whe

using

than

one

pair

speakers

the

same

time,

you

cé

work

out

their

combined

impedance

with

the

following

formula

where

and

are

the

impedance

values

each

speaker

pai

pairs

parallel

(A+B

A+C)

(Xx

combined

impedance

Example

for

pairs

ohm

speakers:

(8x8)/(8

4ohms

pairs

series

(B+C)

combined

impedance

pairs

(A+B+C)

Same

formula

1),

with

A=X

and

(B+C)=

the

combined

impedance

does

not

correspond

exactly

the

three

LOAD

seitings,

select

the

closest

one.

LEFT

and

RIGHT

LEVEL

controls:

These

give

you

independent

control

over

the

power

output

levels

the

and

speakers

This

allows

you

preset

speaker

balance

for

optimum

stere

imaging.

These

controls

can

also

serve

protect

speakers

with

power

handling

capacity

lower

than

this

amplifier’s

rate

output.

The

connection

diagram

provided

page

32.

CONTROL

AMPLIFIER

SPEAKERS

($)

SPEAKERS

Make

sure

the

left

(L)

and

right

(R)

channels

are

connected

consist-

ently

between

components.

NOTE:

Before

making

altering

any

the

connections

described

below,

sure

turn

off

the

power

the

MX-70.

Making

sure

that

the

contro!

amplifier

also

turned

off,

connect

the

outputjacks

your

control

amplifier

the

corresponding

INPUT

jacks

the

rear

panel

this

unit.

Always

check

that

the

RCA

plugs

the

connecting

cord

are

clean,

the

left

and

right

channels

both

units

correspond,

connections

are

secure,

and

both

units

are

properly

grounded.

The

MX-70

can

drive

three

pairs

speakers

(A,

Band

the

same

time.

Those

connected

terminals

are

parallel

with

pairs

and

which

are

series.

The

following

table

shows

the

minimum

load

impedances

per

speaker

for

all

possible

connections.

Number

MX-70

Minimum

speaker

speakers

terminals

load

impedance

pair

pairs

A+B+C

8ohms

B,C:

ohms

sure

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)

continuous

full

power

may

cause

the

protection

circuit

activate.

When

connecting

the

speaker

cords,

observe

the

“+”

and

“—”

markings

the

backs

the

speakers

and

MX-70.

the

“+”

and

“—”

polarities

are

reversed,

the

sound

will

unnatural

and

lack

bass.

Speaker

cords

should

cut

short

possible.

not

coil

excess

cord

bundle

with

cables

from

other

components.

pairs

parallel

Strip

approximately

(3/8”)

insulation

from

the

ends

the

speaker

cords

and

connect

them

explained

the

page:

A.Light-gauge

Speaker

cords

Partly

unscrew

the

plastic

wire

holders.

Insert

the

stripped

ends

the

speaker

cords

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

the

speaker

cords

into

the

holders

until

they

protrude

the

other

side.

Splay

the

strands

shown,

then

screw

the

wire

holders

back

Before

assuming

that

your

amplifier

faulty,

check

the

following

list.

you

still

have

any

doubts

questions,

contact

your

nearest

YAMAHA

dealer.

Symptom

2703.

๒

0 อ

๐

ร

น

๒

Remedy

power

even

when

the

POWER

switch

ON.

The

power

cord

nat

plugged

securely.

Plug

securely.

| |

sound

heard

from

the

left

and/or

right

The

speaker

cords

are

not

properly

connected.

Check

speaker

connections

and

correct

them.

speaker(s).

Either

both

LEVEL

controls

are

set

—

oodB.

Adjust

the

appropriate

LEVEL

control(s).

The

cords

from

the

control

amplifier

are

not

secure.

Connect

them

securely.

The

control

amp’s

balance

set

the

extreme

left

Adjust

the

control

amp’s

balance

control.

right.

| |

The

sound

ceases

suddenly,

and

the

The

speaker

protection

circuit

has

activated.

Turn

power

OFF,

then

again

reset

the

speaker

protection

PROTECTION

indicator

lit.

circuit.

Also

see

CONNECTING

SPEAKERS

There

malfunction

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,

ohms

170W

Rated

Output/8

onms

0.003%

0.007%

THD,

ohms

Signal

Noise

Ratio

(IHF-A-Network)

MAIN

(shorted)

124dB.

Dynamic

Power

Per

Channel

MAIN

(5.1

terminated)

120d8

(by

IHF

Dynamic

Headroom

measuring

method)

Residual

Noise

(IHF-A-Network)

21uV

ohms

270W

ohms

330W

Channel

Separation

ohms

440W

Input

shorted,

terminated,

ohms

570W

1kHz/10kHz

89dB/72dB

ohms

600W

Power

Supply

DIN

Standard

Output

Power

Par

Channel

Europe

AC220V,

50Hz

1kHz,

THD,

ohms

250W

U.K.

AC240V,

50Hz

Power

Band

Width

Power

Consumption

1,150W

0.03%

THD

85W,

ohms

10Hz

60kHz

Dimentions

435

165

425mm

Damping

Band

Width

(17-1/8”

6-1/2”

16-47/64”)

1kHz,

ohms

Weight

14.5kg

input

Sensitivity/impedance

MAIN

| -

1.32V/60kQ

Specifications

subject

change

without

notice.

Frequency

Response

(20Hz

20kHz)

+0,

—0.2dB

Total

Harmonie

Distortions

(20Hz

20kHz)

MAIN

Out,

85W/8Q

0.003%

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