Akai AT-2650 Manuel utilisateur

BAHN

iit.

IV.

VI.

Vil.

VII.

IX.

XI.

For

SECTION

SERVICE

MANUAL

TABLE

CONTENTS

TECHNICAL

DATA

2.0.

eee

EEMODEELMAT-2650

ses

wraton

teat

eneres

Get

Ris

vot

aca

alent

GARE

Sie

ener

ale

pipe

elas

MODEL

AM-2650

201

eet

eee

DISMANTLING

UNIT

2.0.0.0

MODEL-AT-2650..c422

seek

PAG

eRe tee

Poe

Bae

MODEL

AM-2650

20...

eee

een

CONTROUS.

soccer

tis

eat

ERR

EATS

SES

MODEL

AT-2650

000

eee

MODEL

AM-2650

2.02.

nee

eee

PRINCIPAL

PARTS

LOCATION

2.0.2...

MODEL

AT-2650

20.

eee

MODEL

AM-2650

2...

OPERATING

PRINCIPLES

QUADRATURE

DETECTION

SYSTEM

........-

20-0

eres

OPERATING

PRINCIPLES

PLL

CIRCUIT

EMPLOYED

STEREO

DEMODULATION

CIRCUIT

2.0...

00.

eee

PLL

CIRCUIT

OPERATION

.......

0.0.0.

STEREO

DEMODULATION

CIRCUIT

2.2...

OPERATING

PRINCIPLES

NOISE

CANCELLER

CIRCUIT

....

2.2...

eee

BASIC

CIRCUIT

FOR

PULSE

NOISE

SUPPRESSION

........

0.20

eee

ees

OPERATION

PRINCIPLE

WITH

STEREO

SIGNALS

0.0...

0.2

ees

ADJUSTMENT

METHOD

FOR

THE

PILOT

SIGNAL

GENERATING

CIRCUIT

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

LEVEL

DIAGRAM...

0...

TUNER

ADJUSTMENT

(AT-2650)

2.00

TUNER

SECTION

ADJUSTMENT

0.0.

TUNER

SECTION

ADJUSTMENT

...

2.2.00

AMPLIFIER

ADJUSTMENT

(AM-2650)

200.6

IDLING

CURRENT

ADJUSTMENT

.......

2.06.

eee

LEVEL

METER

INDICATION

ADJUSTMENT

...

2.2.0.0.

6-2

TUNING

CORD

THREADING

...

2.1.

nee

CLASSIFICATION

VARIOUS

P.C

BOARDS

...

2.0...

P.C

BOARD

TITLE

AND

IDENTIFICATION

NUMBER

.....

22...

eee

ees

MODEL

AT-2650

COMPOSITION

VARIOUS

P.C

BOARDS

.......

eee

ees

MODEL

AM-2650

COMPOSITION

VARIOUS

P.C

BOARDS...

0-0-6

SCHEMATIC

DIAGRAM

basic

adjustments,

measuring

methods,

and

operating

principles,

refer

GENERAL

TECHNICAL

MANUAL.

TECHNICAL

DATA

MODEL

AT-2650

TUNER

SECTION

FREQUENCY

RANGE

87.5

MHz

108

MHz

SENSITIVITY

(IHF)

1.6

CAPTURE

RATIO

1.2

SELECTIVITY

(IHF)

than

80 dB

IMAGE

REJECTION

than

110

(98

MHz)

REJECTION

than

110

(98

MHz)

SPURIOUS

REJECTION

than

110

(98

MHz)

SUPPRESSION

SIGNAL

NOISE

RATIO

HARMONIC

DISTORTION

MONO

Less

than

0.1%

(100%

modulation)

STEREO

Less

than

0.15%

(100%

modulation)

STEREO

FREQUENCY

RESPONSE

kHz

dB,

—3

MUTING

Level

Control

100uV)/Switchable

ON-OFF

STEREO

SEPARATION

than

kHz)

SUB

CARRIER

SUPPRESSION

than

OUTPUT

VOLTAGE

Controllable

from

(100%

modulation)

ANTENNA

INPUT

IMPEDANCE

300

ohms

balanced,

ohms

unbalanced

TUNER

SECTION

FREQUENCY

RANGE

520

kHz

1,605

kHz

SENSITIVITY

(IHF)

uV/m

(bar

antenna),

(external

antenna)

SELECTIVITY

(IHF)

than

IMAGE

REJECTION

than

(1,000

kHz)

REJECTION

than

SIGNAL

NOISE

RATIO

than

OUTPUT

VOLTAGE

_|_

Controllable

from

ANTENNA

Built-in

ferrite

bar

antenna

MISCELLENEOUS

SEMICONDUCTORS

Transistors:

12,

Diodes:

15,

FETs:

1Cs:

POWER

REQUIREMENTS

120V,

for

U.S.A.

and

Canada

220V,

for

Europe

except

and

Australia

240V,

for

and

Australia

110V/220V/240V.

50/60

internally

switchable

for

other

countries.

DIMENSIONS

440

(W)

144

(H)

368

(D)

mm,

(17.3

5.7.x

14.5”)

WEIGHT

7.5

(16.5

lbs)

For

improvement

purposes,

specifications

and

design

are

subject

change

without

notice.

MODEL

AM-2650

POWER

AMPLIFIER

SECTION

RATED

OUTPUT

POWER

2-CHANNELS

DRIVEN

watts

per

channel,

minimum

RMS,

ohms

from

20,000

with

than

0.08%

total

harmonic

distortion

POWER

BANDWIDTH

(IHF)

kHz

ohms

(Total

Harmonic

Distortion:

0.08%)

kHz/8

ohms

(Total

Harmonic

Distortion:

0.08%)

SIGNAL

NOISE

RATIO

(IHF)

PHONO

Better

than

AUX

Better

than

RESIDUAL

NOISE

Less

than

0.5

ohms

CHANNEL

SEPARATION

(IHF)

PHONO

Better

than

1,000

DAMPING

FACTOR

than

kHz,

ohms)

OUTPUT

SPEAKERS

ohms)/A+B

ohms)

HEADPHONE

ohms

PREAMPLIFIER

SECTION

INPUT

SENSITIVITY/IMPEDANCE

PHONO PHONO

mV/33/47/100

kohms

PHONO

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:

mV/30

kohms

FREQUENCY

RESPONSE

PHONO

(RIAA

EQUALIZATION)

TUNER,

AUX,

TAPE

MONITOR

kHz

dB,

—1

kHz

dB,

—1

TONE

CONTROL

BASS

100

TREBLE

kHz

LOUDNESS

CONTROL

+10

100

Hz,

kHz

(Volume

control

set

—30

position)

FILTER

HIGH

—3

kHz

LOW

—3

AUDIO

MUTE

—20

attenuation

MISCELLANEOUS

SEMICONDUCTORS

Transistors:

33,

Diodes:

17,

ICs:

POWER

REQUIREMENTS

120V,

for

U.S.A.

and

Canada

220V.

for

Europe

except

and

Australia

240V,

for

and

Australia

110V/220V/240V,

internally

switchable,

50/60

for

other

countries.

DIMENSIONS

440

(W)

144

(H)

345

(D)

mm,

(17.3

5.7

13.6”)

WEIGHT

10.9

(23.5

Ibs)

For

improvement

purposes,

specifications

and

design

are

subject

change

without

notice.

Ht.

DISMANTLING

UNIT

MODEL

AT-2650

case

trouble,

etc.

necessitating

dismantling,

please

dismantle

the

order

shown

the

photographs.

Reassemble

reverse

order.

SCREW

KNOBS

SCREWS

UPPER

COVER

SCREWS

FRONT

PaxtL

SCREWS.

mare

Eee

yer

}

Ben,

—e

TRALEE

“ita

<__TUSRAENUURULETTATU

RUE

BOTTOM

Pi.ATE

MODEL

AM-2650

aces

TUES

ALLL

wey,

ILUELNUNLG

incHELIDALI

eee

BOTTOM

PLATE

SCREWS

Gti

AKAL

{

E F

SCREWS

CONTROL

KNOBS

SCREWS

BEPERCEUVER

SCREWS

SCREWS.

FRONT

PANEL

ili,

CONTROLS

MODEL

AT-2650

AEALT

cai

svenco

Tunes

moan

AT-

2660

(9)

GQ)

“900A

BALAES

BET

OPEN!

‘SACU

LOR

ERE

seabenanceetae

mace

cides

ARON>O©

WNHAARWN>

Fig.

Controls

AT-2650

DIAL

SCALE

DIAL

SCALE

SIGNAL

STRENGTH

METER

TUNING

METER

POWER

INDICATOR

LAMP

STEREO

INDICATOR

LAMP

TUNING

KNOB

POWER

SWITCH

OUTPUT

LEVEL

CONTROL

NOISE

CANCEL

SWITCH

MUTE

SWITCH

and

LEVEL

ADJUSTER

INPUT

SELECTOR

ANTENNA

TERMINALS

FERRITE

BAR

ANTENNA

OUTPUT

TERMINALS

MODEL

AM-2650

OMNDGRYN>

RaON>O

aid

tains

Mobs

ceca

‘E14

POWER

PHONES

FILTER

roue

ease

TREBLE

TAPE

MONITOR:

SOURCE

ter

;

ps)

-E

ade

cae

erento

miccn

are

AMPLRER

moan!

AM-2850

—

OU®

(8)

—SPEAKER

Ao B

(4-ehme)

Aend

(8-wotans)

canyen

cese

une

gutside

indicated

SROCK

HAZARD

WAT

TREKS

RISREE

SBE

PAS

SRLEVEE

“SeRMETERESoATANR

9x00

OFFA!

Fig.

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

TERMINALS

MODE

SWITCH

19.

PHONO

TERMINALS

LOUDNESS

SWiTCH

20.

TUNER

TERMINALS

VOLUME

CONTROL

21..

AUX

TERMINALS

INPUT

SELECTOR

22.

Aand

SYSTEM

SPEAKER

TERMINALS

POWER

SWITCH

and

POWER

INDICATOR

LAMP

23.

EXTRA

OUTLETS

(some

models

not

equipped

HEADPHONE

JACK

with

this

facility)

LOW

FILTER

SWITCH

24.

GROUND

TERMINAL

HIGH

FILTER

SWITCH

25,

TAPE

SYSTEM

DIN

JACK

TONE

SWITCH

26.

TAPE

SYSTEM

REC

JACKS

BASS

TONE

CONTROL

27.

TAPE

SYSTEM

PLAY

JACKS

TREBLE

TONE

CONTROL

28.

TAPE

2SYSTEM

REC/PLAY

JACKS

STEREO

BALANCE

CONTROL

29.

CORD

(AC

Iniet

for

and

some

other

countries)

IV.

PRINCIPAL

PARTS

LOCATION

MODEL

AT-2650

FRONT

END

BAR

ANTENNA

FB824UI4

FILTER

P.C

BOARD

ANT

901

T3-6501C

POWER

TRANSFORMER

2650T

-70

POWER

SUPPLY

P.C

BOARD

T3-

4502

POWER

SWITCH

Sw}

TUNER

BOARD

T3-

6501A

Fig.

Top

View

POWER

INDICATOR

rFM

STEREO

INDICATOR

;

{

;

{oo

POWER

SWITCH

TUNING

SHAFT

SELECTOR

SWITCH

i !

Swi

OUTPUT

LEVEL

CONTROL

CMUTE

LEVEL

CONTROL

VR2

5SOKB

VR3

2CKB

NOISE

CANCEL

SWITCH

—

“FM

MUTE

SWITCH

swe

Fig.

Front

View

MODEL

AM-2650

WER

TRA

NSr

MER

ELECTROLYTIC

CAPACITORS

risuiene:e

GARD

903,904

4000

52wv

‘i

e202

lel

M3-65014

MAIN

AMP

BOARD

M3-E6504A

”

PEE.

MAIN

VOL,

BALANCE

P.C

BOARD

M3-6502

A/B

Fig.

Top

View

rAUDIO

MUTE

SWITCH

SW3

;MODE

SWITCH

Sw!

LOUDNESS

SWITCH

SW2

KER

SYSTEM

’

CTOR

ane

LEFT

RIGHT

‘

per

ob.

of.

“

See

{

LED

BOARD

M3-6504C

1am

pees

ean

“

cngeeels

woot

seat

4 i

Seerice

ponte

ere

sis

betes

oiled

fia

POWER

SWITCH

Low

HiGH

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.

Front

View

Ce manuel convient aux modèles suivants

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