Akai AT-2650 Manuale utente

Questo manuale è adatto per i seguenti modelli

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BAHN

ae

a

I.

iit.

IV.

VI.

Vil.

VII.

IX.

XI.

XI.

For

SECTION

1

SERVICE

MANUAL

TABLE

OF

CONTENTS

TECHNICAL

DATA

2.0.

0c

ne

eee

eee

eee

ne

eee

2

EEMODEELMAT-2650

4

ses

wraton

teat

eneres

g

Get

GM

Ris

vot

aca

alent

9

GARE

Sie

ener

ale

ae

Me

pipe

elas

2

2.

MODEL

AM-2650

201

ee

ee

eet

ee

eee

eee

te

eee

3

DISMANTLING

OF

UNIT

2.0.0.0

ee

ee

es

4

1

MODEL-AT-2650..c422

seek

na

PAG

eRe tee

Poe

Bae

ee

Ae

de

ee

Ee

4

2.

MODEL

AM-2650

20...

ee

te

eee

ee

eee

een

es

$

CONTROUS.

soccer

tis

eat

ES

A

Se

DE

ERR

TN

eG

EATS

GE

SES

6

1.

MODEL

AT-2650

000

ee

eee

ee

eS

6

2.

MODEL

AM-2650

2.02.

ce

ee

ee

ee

nee

eee

ee

7

PRINCIPAL

PARTS

LOCATION

2.0.2...

0.

ec

ee

te

ne

ee

8

1.

MODEL

AT-2650

20.

Ee

ee

eee

ee

ee

ee

8

2.

MODEL

AM-2650

2...

ee

ne

ee

Ee

ns

9

OPERATING

PRINCIPLES

OF

QUADRATURE

DETECTION

SYSTEM

........-

20-0

ee

eres

10

OPERATING

PRINCIPLES

OF

PLL

CIRCUIT

EMPLOYED

IN

STEREO

DEMODULATION

CIRCUIT

..

2.0...

00.

ee

eee

12

1.

PLL

CIRCUIT

OPERATION

.......

0.0.0.

ce

ee

12

2,

STEREO

DEMODULATION

CIRCUIT

2.2...

0.

es

13

OPERATING

PRINCIPLES

OF

FM

NOISE

CANCELLER

CIRCUIT

....

2.2...

0.

eee

ee

eee

15

1.

BASIC

CIRCUIT

FOR

PULSE

NOISE

SUPPRESSION

........

0.20

e

eee

ees

15

2.

OPERATION

PRINCIPLE

WITH

STEREO

SIGNALS

..

0.0...

0.2

ee

ee

ees

15

3.

ADJUSTMENT

METHOD

FOR

THE

PILOT

SIGNAL

GENERATING

CIRCUIT

.......------

16

LEVEL

DIAGRAM...

0...

en

ee

ee

ES

17

TUNER

ADJUSTMENT

(AT-2650)

2.00

en

ee

18

1.

FM

TUNER

SECTION

ADJUSTMENT

..

0.0.

0

ee

19

2,

AM

TUNER

SECTION

ADJUSTMENT

...

2.2.00

ee

20

AMPLIFIER

ADJUSTMENT

(AM-2650)

200.6

ee

21

1.

IDLING

CURRENT

ADJUSTMENT

.......

2.06.

eee

21

2,

LEVEL

METER

INDICATION

ADJUSTMENT

...

2.2.0.0.

6-2

ee

es

22

TUNING

CORD

THREADING

...

2.1.

0

ee

nee

23

CLASSIFICATION

OF

VARIOUS

P.C

BOARDS

...

2.0...

ee

ee

ee

24

1.

P.C

BOARD

TITLE

AND

IDENTIFICATION

NUMBER

.....

22...

ee

eee

ees

25

2.

MODEL

AT-2650

COMPOSITION

OF

VARIOUS

P.C

BOARDS

.......

2.

ee

eee

ees

28

3,

MODEL

AM-2650

COMPOSITION

OF

VARIOUS

P.C

BOARDS...

--

0.

0-0-6

ee

ee

52

SCHEMATIC

DIAGRAM

basic

adjustments,

measuring

methods,

and

operating

principles,

refer

to

GENERAL

TECHNICAL

MANUAL.

I.

TECHNICAL

DATA

1.

MODEL

AT-2650

FM

TUNER

SECTION

FREQUENCY

RANGE

87.5

MHz

to

108

MHz

SENSITIVITY

(IHF)

1.6

UV

CAPTURE

RATIO

1.2

dB

SELECTIVITY

(IHF)

More

than

80 dB

IMAGE

REJECTION

More

than

110

dB

(98

MHz)

IF

REJECTION

More

than

110

dB

(98

MHz)

SPURIOUS

REJECTION

More

than

110

dB

(98

MHz)

AM

SUPPRESSION

55

dB

SIGNAL

TO

NOISE

RATIO

75

dB

HARMONIC

DISTORTION

MONO

Less

than

0.1%

(100%

modulation)

STEREO

Less

than

0.15%

(100%

modulation)

FM

STEREO

FREQUENCY

RESPONSE

20

Hz

to

15

kHz

+1

dB,

—3

dB

MUTING

Level

Control

(1

#V

to

100uV)/Switchable

to

ON-OFF

STEREO

SEPARATION

More

than

45

dB

(1

kHz)

SUB

CARRIER

SUPPRESSION

More

than

65

dB

OUTPUT

VOLTAGE

Controllable

from

0

mV

to

2V

(100%

modulation)

ANTENNA

INPUT

IMPEDANCE

300

ohms

balanced,

75

ohms

unbalanced

AM

TUNER

SECTION

FREQUENCY

RANGE

520

kHz

to

1,605

kHz

SENSITIVITY

(IHF)

80

uV/m

(bar

antenna),

13

uV

(external

antenna)

SELECTIVITY

(IHF)

More

than

30

dB

IMAGE

REJECTION

More

than

80

dB

(1,000

kHz)

_

IF

REJECTION

More

than

70

dB

SIGNAL

TO

NOISE

RATIO

More

than

50

dB

OUTPUT

VOLTAGE

_|_

Controllable

from

0

mV

to

2V

ANTENNA

Built-in

ferrite

bar

antenna

MISCELLENEOUS

SEMICONDUCTORS

|

Transistors:

12,

Diodes:

15,

FETs:

3.

1Cs:

5

POWER

REQUIREMENTS

120V,

60

Hz

for

U.S.A.

and

Canada

220V,

50

Hz

for

Europe

except

UK

and

Australia

240V,

50

Hz

for

UK

and

Australia

110V/220V/240V.

50/60

Hz

internally

switchable

for

other

countries.

DIMENSIONS

440

(W)

x

144

(H)

x

368

(D)

mm,

(17.3

x

5.7.x

14.5”)

WEIGHT

1

1

7.5

kg

(16.5

lbs)

*

For

improvement

purposes,

specifications

and

design

are

subject

to

change

without

notice.

bh

i

2.

MODEL

AM-2650

POWER

AMPLIFIER

SECTION

RATED

OUTPUT

POWER

2-CHANNELS

DRIVEN

65

watts

per

channel,

minimum

RMS,

at

8

ohms

from

20

to

20,000

Hz

with

no

more

than

0.08%

total

harmonic

distortion

POWER

BANDWIDTH

(IHF)

6

Hz

to

60

kHz

/

8

ohms

(Total

Harmonic

Distortion:

0.08%)

6

Hz

to

60

kHz/8

ohms

(Total

Harmonic

Distortion:

0.08%)

SIGNAL

TO

NOISE

RATIO

(IHF)

PHONO

Better

than

75

dB

AUX

|

Better

than

95

dB

RESIDUAL

NOISE

Less

than

0.5

mV

at

8

ohms

CHANNEL

SEPARATION

(IHF)

PHONO

Better

than

$5

dB

at

1,000

Hz

DAMPING

FACTOR

More

than

30

(1

kHz,

8

ohms)

OUTPUT

SPEAKERS

A,

B

(4

to

16

ohms)/A+B

(8

to

16

ohms)

HEADPHONE

4

to

16

ohms

PREAMPLIFIER

SECTION

INPUT

SENSITIVITY/IMPEDANCE

PHONO PHONO

1:

3

mV/33/47/100

kohms

PHONO

2:

3

mV/47

kohms

AUX

150

mV/100

kohms

TUNER

150

mV/100

kohms

TAPE

MONITOR

PIN:

150

mV/100

kohms,

DIN:

150

mV/100

kohms

OUTPUT

LEVEL/IMPEDANCE

TAPE

REC

PIN:

150

mV/1

kohms,

DIN:

30

mV/30

kohms

FREQUENCY

RESPONSE

PHONO

(RIAA

EQUALIZATION)

TUNER,

AUX,

TAPE

MONITOR

30

Hz

to

15

kHz

+1

dB,

—1

dB

10

Hz

to

60

kHz

+1

dB,

—1

dB

TONE

CONTROL

BASS

+9

dB

at

100

Hz

TREBLE

+9

dB

at

10

kHz

LOUDNESS

CONTROL

|

+10

dB

at

100

Hz,

+5

dB

at

10

kHz

(Volume

control

set

at

—30

dB

position)

FILTER

HIGH

—3

dB

at

10

kHz

LOW

—3

dB

at

30

Hz

AUDIO

MUTE

—20

dB

attenuation

MISCELLANEOUS

SEMICONDUCTORS

Transistors:

33,

Diodes:

17,

ICs:

4

POWER

REQUIREMENTS

|

120V,

60

Hz

for

U.S.A.

and

Canada

220V.

50

Hz

for

Europe

except

UK

and

Australia

240V,

50

Hz

for

UK

and

Australia

110V/220V/240V,

internally

switchable,

50/60

Hz

for

other

countries.

DIMENSIONS

440

(W)

x

144

(H)

x

345

(D)

mm,

(17.3

x

5.7

x

13.6”)

WEIGHT

10.9

kg

(23.5

Ibs)

*

For

improvement

purposes,

specifications

and

design

are

subject

to

change

without

notice.

Ht.

DISMANTLING

OF

UNIT

1.

MODEL

AT-2650

In

case

of

trouble,

etc.

necessitating

dismantling,

please

dismantle

in

the

order

shown

in

the

photographs.

Reassemble

in

reverse

order.

j

5

SCREW

&

KNOBS

SCREWS

Ww

On

SCREWS

UPPER

COVER

SCREWS

i

FRONT

:

PaxtL

SCREWS.

2

tt

mare

f

Eee

Ee

at

yer

ee

og

e

@

1

|

}

|

|

:

Ben,

—e

|

TRALEE

it

“ita

<__TUSRAENUURULETTATU

RUE

BOTTOM

Pi.ATE

2.

MODEL

AM-2650

Ht

iL

iE

m

Ce

ae

a

ee

aces

TUES

ALLL

LL

wey,

TN

ILUELNUNLG

incHELIDALI

HL

_&

eee

a

e

_

JS

d

BOTTOM

PLATE

e

SCREWS

1

5

4A

&

Cc

|

i

a

\

NS

J

*

Gti

AKAL

:

¢

{

{

{

{

D

E F

SCREWS

CONTROL

KNOBS

|

2

16

SCREWS

|

S

|

7

BEPERCEUVER

|

i

|

i

|

|

'

SCREWS

Ly

SCREWS.

FRONT

PANEL

4

°

8

wa

ili,

CONTROLS

1.

MODEL

AT-2650

AEALT

cai

an

svenco

Tunes

moan

AT-

2660

©

2)

©

|

(9)

GQ)

“900A

BALAES

~

98

BET

OPEN!

‘SACU

BE

LOR

-

ME

NS

ERE

/

seabenanceetae

~

mace

OE

|

pa

cides

ae

ee

ARON>O©

WNHAARWN>

Fig.

1

Controls

AT-2650

FM

DIAL

SCALE

AM

DIAL

SCALE

SIGNAL

STRENGTH

METER

FM

TUNING

METER

POWER

INDICATOR

LAMP

FM

STEREO

INDICATOR

LAMP

TUNING

KNOB

POWER

SWITCH

OUTPUT

LEVEL

CONTROL

NOISE

CANCEL

SWITCH

FM

MUTE

SWITCH

and

LEVEL

ADJUSTER

INPUT

SELECTOR

ANTENNA

TERMINALS

AM

FERRITE

BAR

ANTENNA

OUTPUT

TERMINALS

2.

MODEL

AM-2650

OMNDGRYN>

ee

ee

ee

ee

go

RaON>O

aid

tains

Mobs

ceca

i

‘E14

f

ee

oe

POWER

PHONES

FILTER

roue

ease

TREBLE

TAPE

MONITOR:

SOURCE

Py

a

4g

ter

tp

ea

es

er

;

ps)

@

q

f

f

-

is

Ns

a

_

.

-E

=

ade

2

Ei

ee

cae

i

AK

AL

erento

miccn

are

AMPLRER

moan!

AM-2850

—

i

|

i

i

|

|

|

i

—

|

|

®

©

OU®

©

(8)

G

—SPEAKER

Ao B

(4-ehme)

Aend

8

(8-wotans)

canyen

*

dn

cese

of

une

gutside

Of

indicated

|

+

SROCK

HAZARD

00

WAT

TREKS

RISREE

HK

SBE

-

WE

PAS

SRLEVEE

!

“SeRMETERESoATANR

~

9x00

OFFA!

Fig.

2

Controls

AM-2650

SPEAKER

SYSTEM

SELECTOR

16.

TAPE

MONITOR

SWITCH

OUTPUT

POWER

LEVEL

METERS

(Left

and

Right)

17.

IMPEDANCE

SWITCH

AUDIO

MUTE

SWITCH

18.

PHONO

1

TERMINALS

MODE

SWITCH

19.

PHONO

2

TERMINALS

LOUDNESS

SWiTCH

20.

TUNER

TERMINALS

VOLUME

CONTROL

21..

AUX

TERMINALS

INPUT

SELECTOR

22.

Aand

B

SYSTEM

SPEAKER

TERMINALS

POWER

SWITCH

and

POWER

INDICATOR

LAMP

23.

EXTRA

AC

OUTLETS

(some

models

not

equipped

HEADPHONE

JACK

with

this

facility)

LOW

FILTER

SWITCH

24.

GROUND

TERMINAL

HIGH

FILTER

SWITCH

25,

TAPE

1

SYSTEM

DIN

JACK

TONE

SWITCH

26.

TAPE

1

SYSTEM

REC

JACKS

BASS

TONE

CONTROL

27.

TAPE

1

SYSTEM

PLAY

JACKS

.

TREBLE

TONE

CONTROL

28.

TAPE

2SYSTEM

REC/PLAY

JACKS

.

STEREO

BALANCE

CONTROL

29.

AC

CORD

(AC

Iniet

for

UK

and

some

other

countries)

IV.

PRINCIPAL

PARTS

LOCATION

1.

MODEL

AT-2650

FRONT

END

BAR

ANTENNA

FB824UI4

FILTER

P.C

BOARD

ANT

901

T3-6501C

POWER

TRANSFORMER

AT

-

2650T

-70

POWER

SUPPLY

P.C

BOARD

T3-

4502

POWER

SWITCH

__

Sw}

TUNER

PC

BOARD

T3-

6501A

ti

Fig.

3

Top

View

POWER

INDICATOR

D2

rFM

STEREO

INDICATOR

Di

;

&

{

:

;

{oo

me

'

Hl

|

~

i

i

i

POWER

SWITCH

|

|

:

TUNING

SHAFT

SELECTOR

SWITCH

Sw

|

i

i !

Swi

i

|

OUTPUT

LEVEL

CONTROL

~

i

i

CMUTE

LEVEL

CONTROL

VR2

5SOKB

|

:

VR3

2CKB

NOISE

CANCEL

SWITCH

—

“FM

MUTE

SWITCH

SW

3

swe

Fig.

4

Front

View

2.

MODEL

AM-2650

WER

TRA

a

BE

TR

NSr

Oe

MER

ELECTROLYTIC

CAPACITORS

risuiene:e

GARD

:

903,904

4000

52wv

a

=

|

:

‘i

e202

|

lel

ea

M3-65014

:

i

MAIN

AMP

PC

BOARD

M3-E6504A

”

1

PEE.

MAIN

VOL,

&

BALANCE

P.C

BOARD

M3-6502

A/B

Fig.

5

Top

View

rAUDIO

MUTE

SWITCH

SW3

;MODE

SWITCH

Sw!

i

-

LOUDNESS

SWITCH

SW2

|

H

|

|

|

EA

L

KER

SYSTEM

’

:

CTOR

Ae

ane

LEFT

RIGHT

m

|

H

|

|

‘

i

‘

ad

:

i

ee

per

es

Oe

i

ee

.

es

=

ob.

of.

of.

“

:

ot

See

|

i

{

LED

PC

BOARD

M3-6504C

1

1am

~

i:

i

pees

ean

“

a

S

cngeeels

woot

seat

i

4 i

Seerice

Si

ponte

ere

sis

betes

:

oiled

fia

=

POWER

SWITCH

|

Low

HiGH

=

|

i

|

i

'

SWw3O0!

sws

sw2

BASS

CONTROL

BALANCE

CONTROL

Sade

ite

|

!

VRI

SOKC

VR2

250KMN

coe

|

|

TONE

SWITCH

TREBLE

CONTROL

TAPE

MONITOR

SWITCH

evel

:

sw}

VR2

S5SOKC

sw3

|

FILTE®

SWITCH

Fig.

6

Front

View