Yamaha M-2 User manual

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3

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Hi.

RA

Ea

Thank

you

very

much

for

purchasing

the

YAMAHA

Stereo

Power

Amplifier

M-2

Developed

CONTENTS

by

applying

the

best

of

YAMAHA’s

superior

electronic

technology,

the

M-2

is

a

DC

stereo

power

amplifier

that

achieves

an

extremely

high

level

of

performance.

OR

>

The

output

stage,

which

uses

pure

complementary

OCL

and

triple

push-pull

circuitry,

Caution:

Read.

This

Before

Operating

produces

the

rated

output

of

240W

+

240W

without

any

strain

on

the

large-capacity

power

Your

M2...

RE

3

supply

section,

ee

ÍConnection

Diagram.

EO

4

Before

first

operating

your

M-2,

please

read

this

Owner's

Manual

carefully,

in

order

to

0011...

[Front

Panel

and

GT

`

6

realize

the

potential

of

the

unit

and

to

keep

it

in

best

condition

for

many

years

of

trouble-

^ ^

[Connection

and

Operation

.|...........

7

free

use.

Specifications

|...

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

8

Block

Diagram

s

er

rU

Or

Ci

EC

EO

Eg

9

Schematic

Diagram

|

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

10

Troubleshooting

|..........

eren

11

€

The

voltage

amplifying

stage

employs

a

cascade-

€

Two

extremely

large

22,000

uF

capacitors,

two

connected

differential

two-stage

circuit

separate

constant-voltage

power

supplies

for

the

throughout.

The

use

of

a

Dual

FET

input

and

a

cascode

bootstrap

circuit

in

the

first

stage

and

a

cas-

cade-connection,

current

mirror

and

push-pull

output

in

the

pre-drive

stage

ensures

a

high

degree

of

stability,

low

distortion

and

im-

proved

high-frequency

characteristics.

In

the

driver

and

the

power

amplifier

a

three-

stage

emitter

follower

is

pure

complementary

OCL

SEPP

circuitry

using

high-ft

transistors.

This

accounts

for

wide

bandwidth,

high

output

and low

distortion.

voltage

amplifying

stage,

and

the

use

of

a

pure

copper

plate

earth

line

for

ultra-low

impedance

guarantee

greatly

reduced

intermodulation

dis-

tortion,

improved

separation

and

absolutely

stable

operation.

Other

Features

Except

for

the

chemical

capacitors

in

the

power

supply

section,

mylar

and

styrol

capacitors

are

employed

throughout.

Layout

of

parts,

wiring,

earth

line

as

well

as

many

other

aspects

have

been

given

due

con-

sideration.

The

basic

design

ensures

high

reliability,

while

the

ultimate

aim

has

been

the

improvement

of

the

overall

audio

characteristics.

IMPORTANT!

Please

record

the

serial

number

of

your

unit

in

the

space

below

Model

Name

M-2

Serial

No.

The

serial

number

is

located

on

the

rear

of

the

chassis.

Retain

this

Owner's

Manual

in

a

safe

place

for

future

reference.

PLACE

OF

INSTALLATION

Do

not

use

the

set

in

€

locations

exposed

to

direct

sunshine,

such

as

near

windows

®

locations

of

high

temperatures,

such

as

near

heaters

€

locations

of

extremely

low

temperatures

©

humid

or

dusty

locations

e

Since

the

M-2

is

quite

heavy

[20.9

kgl

it

should

be

placed

on

a

firm

base.

'

WATER

DAMAGE

If

with

water,

immediately

disconnect

the

power

plug

and

contact

your

YAMAHA

service

store.

Be

careful

not

to

place

any

container

that

holds

liguid

near

the

ampli-

fier.

PROPER

VENTILATION

Never

cover

the

ventilation

holes

on

top

of

the

amplifier

with

any

object.

If

proper

ventilation

is

not

ensured,

the

internal

tem-

perature

of

the

set

will

rise

unduly,

which

will

cause

improper

operation

and

lead

to

damage.

,

CAREFUL

HANDLING

Avoid

using

strong

force

when

operating

any

of

the

switches

and

controls.

|

UNAUTHORIZED

OPENING

an

Never

open

the

case

of

the

amplifier

or

touch

any

of

the

parts

inside,

as

there

is

serious

danger

of

electric

shock.

If,

by

accident,

some

foreign

matter

has

been

dropped

inside

the

set,

immediately

disconnect

the

power

plug

and

contact

your

YAMAHA

service

store.

`

ADDITIONAL

AC

POWER

OUTLET

The

additional

AC

power

outlet

on

the

rear

panel

of

the

set

is

UNSWITCHED

(not

linked

with

the

power

switch)

and

has

a

maximum

capacity

of

100W.

Before

con-

necting

another

piece

of

equipment

to

this

outlet,

check

its

power

consumption

to

ensure

it

does

not

exceed

this

limit.

MOVING

THE

SET

Before

moving

the

amplifier,

be

sure

to

dis-

connect

the

power

plug

as

well

as

all

other

connection

cords.

POWER

CORD

When

disconnecting

the

power

cord,

always

hold

the

plug

itself

and

do

not

pull

the

cord.

When

the

set

is

not

to

be

used

for

a

long

period

of

time,

it

is

recommended

to

dis-

connect

the

power

cord.

PLAYING

RECORDS

Be

sure

to

turn

down

the

volume

on

the

contro!

amplifier

before

lifting

or

lowering

the

tone

arm

when

playing

records.

Other-

wise

the

transient

noise

may

cause

damage

to

the

speakers.

MAKING

CONNECTIONS

Always

switch

off

the

power

before

connect-

ing

or

disconnecting

the

input

cables.

CLEANING

Avoid

wiping

the

case

with

liquids

such

as

benzine

or

thinner,

and

do

not

use

insecti-

cide

sprays

or

the

like

near

the

set.

Always

use

a

soft,

dry

cloth

to

wipe

the

set.

—

BEFORE

REQUESTING

SERVICE

Before

calling

in

a

service

technician,

please

check

the

TROUBLESHOOTING

chart

in

the

last

section

of

this

manual

to

be

sure

there

is

no

misoperation.

OWNER’S

MANUAL

Please

keep

this

Owner’s

Manual

for

future

reference.

RIGHT

Speakers

CONNECTION

DIAGRAM

Ground

cord

Control

Amplifier

Gb

YAMAHA

eS

אתה

ג󰾯

PREVENT

FIRE

CH

SHOCK

৮5289)

DD

AOT

EXPOSE

THIS

o

AC

QUTLETS

120

5آانالا󰾯

SOWATTS

ALLAR

TO

RAIN

OR

MOISTURE

E

:

60145

CAUTION:

OG

NOT

REMOVE

THESE

SCREWS.

SCC

DDT”OV

CAUTION

HAN

AM

ATSU.

JAPAN

ATTENTION:

NE.

PAS

ENLLVER

LES

VIS

LIFE

LES

INSTRUCTIONS.

AU-

DESSOUS

DE

LAPPASEIL

—

TARE

גו󰾯

Pit

AEC

UT,

2

Ux

TOME

vci

Ae

MAR

Jiu)

AAR

TOTAL

m

2১:

If

DC

voltage

is

contained

in

the

output

of

a

control

amplifier

connected

to

the

DC

INPUT

terminals,

the

protect

circuit

operates,

ACRE

8

8

/SPEA«ER

৬৯6

e

১০

SPEAKER

SPEAKER

WARNING-TO

PREVENT

FIRE

OR

SHOCK

HAZARI

NOT

EXPOSE

THIS

APPLIANCE

TO

RAIN

OR

MOI.

CAUTION-DO

NOT

REMOVE

THESE

SCREWS.

SEE

e

Canadian

Model

DEE

EE

LEFT

Speakers

FRONT

PANEL

AND

CONTROLS

9

NATURAL

5

SIEREQ

POWER

p^

₪5

P

ER

GO

POWER“

switch)

When

this

button

is

depressed,

power

to

the

unit

will

be

switched

on

and

the

switch

will

light

up.

When

depressed

again,

power

is

turned

off.

₪

Due

to

the

action

of

the

muting

relay,

no

sound

will

be

heard

for

several

seconds

after

switching

on

the

power.

This

prevents

any

transient

switching

noises

from

reaching

the

speakers.

W

Be

sure

to

turn

down

the

VOLUME

control

on

the

control

amplifier

to

minimum

before

turning

on

the

POWER

switch

to

guard

the

speakers

against

any

sudden

loud

program

sounds

produced

after

the

muting

relay

time.

am

mm

enne

DU

HN

1

SPEAKER

PEAK

OUTPUT

LEVEL

O

SPEAKERSI(A

and

B)

These

two

push-button

switches

govern

the

two

speaker

terminals

A

and

B.

When

depressed,

the

speaker

set

connected

to

the

respective

terminal

will

be

connected

and

the

switch

will

light

up.

Depressing

the

switch

again

will

disconnect

the

speakers.

When

using

both

terminals

at

the

same

time,

refer

to

"Speaker

Connections"

(p.

7)

regarding

speaker

impedance.

The

SPEAKER

switches

should

be

turned

off

when

changing

the

connection

of

the

speaker

cords,

and

they

can

be

used

in

other

cases,

such

as

changing

program

sources

etc.,

as

well.

D.󰾰

ווווווווווווווווון..

הפשה

400

৩”

101000010000000000,

0

@

PEAK

OUTPUT

LEVEL

(PEAK

and

OVERLOAD

INDICATOR)

These

peak

indicators

provide

visual

indication

of

the

left

and

right

output

levels.

They

cover

a

range

of

0.002W

to

400W

(89)

(—50dB

to

3dB).

Note:

Also

that

the

meters

are

calibrated

accu-

rately

for

output

power

into

standard

2

speakers,

but

that

corrections

must

be

applied

if

speakers

with

different

imped-

ance

are

used.

Clipping

(at

about

2%

THD)

is

indicated

for

the

left

and

right

outputs

separately

by

the

OVER-

LOAD

indicators.

When

these

light

up,

turn

down

the

input

level

by

using

the

LEVEL

controls

on

the

rear

panel.

CONNECTION

AND

|

AC

CONNECTIC

1.

As

the

M-2

has

very

high

power

consumption,

do

not

connect

it

to

an

additional

AC

outlet

on

some

other

piece

of

equipment,

but

plug

it

directly

into

a

wall

outlet.

2

Regardless

of

the

position

of

the

power

switch,

the

additional

AC

power

outlet

on

the

rear

panel

of

the

M-2

provides

AC

power

for

a

maximum

consumption

of

100W.

8

5

=

S

0

t

7]

6

H

Speakers

with

any

impedance

from

8

~

1682

can

be

connected

to

either

of

the

A

or

B

terminals

on

the

rear

panel.

When

using

two

sets

of

speakers

at

the

A

and

B

terminals

simultaneously,

be

sure

to

use

only

speakers

having

an

impedance

of

4.

1.

To

connect

the

speaker

cords

to

the

speaker

terminals,

loosen

the

terminal

knob

by

turning

it

to

the

left

(anti-clockwise)

so

that

you

can

see

the

hole

into

which

the

cord

will

inserted.

SPEAKER

CORD

ho

OPERATIONS

2.

Insert

the

stripped

speaker

cord

into

the

hole,

turn

the

terminal

knob

to

the

right

(clockwise)

and

tighten

it

fast.

Two

sets

of

speaker

systems

can

be

connectable

to

M-2.

The

terminals

on

the

left

are

for

right

speakers

and

those

on

the

right

for

left

speakers.

'

CONNECTION

TO

CONTROL

AMPLIFIER

Switch

off

the

power

to

the

control

amplifier

as

well

as

to

the

power

amplifier.

To

use

M-2

as

a

DC

amplifier,

connect

the

output

cable

from

the

control

amplifier

to

DC

INPUT

terminals

on

the

rear

panel.

To

use

M-2

as

a

DC

amplifier,

also

use

Low-Cut

Filter

and

Sub-Sonic

Filter

so

as

to

prevent

ultra-

low

frequency

noise

(due

to

disc

warping

or

irre-

gular

turntable

rotation,

etc.)

from

entering

the

speakers.

In

general,

the

output

cable

from

the

Control

Am-

plifier

is

connected

to

this

terminal.

This

will

provide

added

protection

to

speaker

from

the

harmful

effects

that

subsonic

rumbles,

etc.,

can

connect

to

the

DC

INPUT

terminals.

Note:

It

is

not

connectable

to

both

of

DC

INPUT

and

AC

INPUT

terminals

at

the

same

time.

So,

connect

it

to

either

terminal

at

a

time

depending

on

the

type

and

use

of

your

audio

equipment.

כ

8

€

Level

controls

are

provided

on

the

rear

panel

to

adjust

the

M-2

for

use

with

any

control

amplifier.

The

right

hand

knob

is

for

the

left

channel

and

the

left

hand

one

for

the

right

channel.

If

the

sound

is

distorted

by

using

a

contro!

amplifier

with

a

high

output,

lower

the

input

sensitivity

by

turning

these

knobs

counter-

clockwise.

Control

Amplifier

80

66

ם

o

o

০

EU

ean

0

0০5

D󰾰

Lch

LEVEL

Control

Rch

LEVEL

Control

Speaker

|

(|

7)

Speaker

Speaker

is

Systems

When

listening

at

low

volumes

Volume

adjustment

of

the

control

amplifier

can

be

facilitated

by

turning

the

set's

LEVEL

control

counterclockwise

a

little.

But

if

turned

fully

counterclockwise,

no

sound

will

be

produced.

SPECIFICATIONS

Rated

Output

Power.

|

|

240W

+

240W

(82,

20Hz~

30kHz

0.005%

T.H.D)

11

01727

1

90172

|

(80,

120W,

0.0196

T.H.D)

-

Input

Sensitivity/

Impedance

০

775

החדהה

שש󰾯

-

নে

E

Kênanga

-

||

DC

Input

|

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—

שש

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7

המשר󰾯

শিট

|

100072

:

-—0.7:0.5dB

-

Reina

Rw

—

der

T

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——

কে

—

Harmonic

Distortion

||

ו󰾯

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اذل«󰾯

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Less

than

0.004%

(1

O0kHz,

120W)

1B,

50Hz:7kHz=4:1,

BOW)

Channel

Separation

(LR,

R

>

L)

I

HYR

2১১

AYAM

A

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Peak

Indicator

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indicator

Point

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Level

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sam

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Rated

Power

Consumption

=

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-—

————

..

Canadian

Medel

1800

vA

וו󰾯

AC

AC

Outlet

—

.

Di

mensions

—

—

—

^

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Weight

DEENEN

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Specifications

subject

to

change

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BLOCK

DIAGRAM

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AMP

CONTROL

AC

DC

INPUT

וו󰾯

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+

yO)

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POWER

AMP

METER

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Indicator

AMP

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