Akai AM-2600 Manuale utente

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AKAI

STEREO

INTEGRATED

AMPLIFIER

move.

AM-2600

SECTION

1

SERVICEMANUAL

..............-00e0000-

1

SECTION

2

PARTS

LIST

.........

00

cccccecececeecees

15

SECTION

3

SCHEMATIC

DIAGRAM.

...................24

SECTION

1

SERVICE

MANUAL

TABLE

OF

CONTENTS

I.

TECHNICAL

DATA:

g:

cs:i

Sdn

se

gehik

etd

hacen

Se

eee

wae

Sard

ene die

MAE

eee

LA

oe

Il.

DISMANTLING

OF

UNIT

20...

cc

cc

eee

reer

e

eee

e

nee

e

ene

e

nena

Ill.

CONTROUS

oes

5.8

5G

8

BARE

RIS

MAAS

BD

iE

are

Thales

Gd

etaes

dee

EARLY

HS

IV

PRINCIPAL

PARTS

LOCATION...

1...

occ

e

een

ees

V.

LEVEL,

DIAGRAM)

-))

ei

h04

oe

tare

De

cree

ew

eee

eee

ee

a

eee

bide

dag

Co

dele

ey

Rae

VI.

MAIN

AMPLIFIER

ADJUSTMENT...

1.

cc

en

ene

n

eee

e

nee

eaee

1.

IDLING

CURRENT

ADJUSTMENT

oo.

eee

een

eens

oe

2.

LEVEL

METER

ADJUSTMENT...

eee

nnn

nee

eens

Vil.

CLASSIFICATION

OF

VARIOUS

P.C

BOARDS

.....

0...

e

ees

1.

RELATION

OF

P.C

BOARD

TITLE

AND

IDENTIFICATION

NUMBER

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

2.

COMPOSITION

OF

VARIOUS

P.C

BOARDS

.....

1...

oes

For

basic

adjustments,

measuring

methods,

and

operating

principles,

refer

to

GENERAL

OPERATING

PRINCIPLES

AND

ADJUSTMENTS.

|.

TECHNICAL

DATA

POWER

AMPLIFIER

SECTION

CONTINUOUS

POWER

OUTPUT

—

2-CHANNELS

DRIVEN

with

no

more

than

0.1%

total

harmonic

distortion.

POWER

BANDWIDTH

(IHF)

7

Hz

to

40

kHz/8

ohms

(Total

Harmonic

Distortion:

0.1%)

a

SIGNAL

TO

NOISE

RATIO

(IHF)

a

7

_

PHONO

Better

than

75

dB

___AUX

|

_

Better

than

95

dB

=

:

RESIDUAL

NOISE

__

te

|

Less

than

0.5

mV

at

8

ohms

-

CHANNEL

SEPARATION

(IHF)

ee

___

_

PHONO

Better

than

55

dBat1,000Hz

DAMPING

FACTOR

_

>

More

than

60(1kHz,8

ohms)

OUTPUT

SPEAKERS

A,

B

(4

to

16

ohms)/A+B

(

8

to

16

ohms)

HEADPHONE

4

to

16

ohms

POWER

INDICATOR

METERS

(2)

3/80W

switchable

;

PREAMPLIFIER

SECTION

INPUT

SENSITIVITY

/IMPEDANCE

PHONO

AUX

TUNER

Phono

2:

3

mV/33,

47

or

100

k

ohms

Phono

1:

3

mV/50

k

ohms

150

mV/100

k

ohms

150

mV/100

k

ohms

TAPE

MONITOR

PIN:

150

mV/100

k

ohms

;

7

ce

DIN:

150

mV/100

k

ohms.

OUTPUT

LEVEL/IMPEDANCE

TAPE

REC

|

PIN:

150

mV/100

k

ohms

DIN:

30

mV/180

k

ohms

_

FREQUENCY

RESPONSE

PHONO

(RIAA

EQUALIZATION)

TUNER,

AUX,

TAPE

MONITOR

30

Hz

to

15

kHz

+0.8

dB,

—0.8

dB

7

Hz

to

70

kHz

+0

dB,

-1

dB

_

TONE

CONTROL

|

BASS

+9

dB at

100

Hz

:

TREBLE

|

+9

dBat

10

kHz

=

:

LOUDNESS

CONTROL

+10

dB

at

100

Hz,

+6

dB

at

10

kHz

(High

Position)

+10

dB

at

100

Hz

(Low

Position)

7

(Volume

Control

set

at

—30

dB

position)

FILTER

HIGH

—5

dBat

7

kHz

(7

kHz

position)

—3 dB

at

10

kHz

(10

kHz

position)

|

LOW

—2

dB

at

50

Hz

(30

Hz

position)

eee

—6

dB

at

50

Hz

(60

Hz

position)

oe

MISCELLANEOUS

SEMICONDUCTORS

Transistors:

35

Diodes:

17

POWER

REQUIREMENTS

DIMENSIONS

_

CSA,

UL

and

LA

models:

120V,

60

Hz

CEE

models:

220V,

50

Hz

Other

models:

110/220/240V,

50/60

Hz

switchable

440(W)

x

141(H)

x

331(D)mm,

(17.3

x

5.6

x

13

inches)

WEIGHT

10

kg

(22

lbs)

*

For

improvement

purposes,

specifications

and

design

are

subject

to

change

without

notice.

lt.

DISMANTLING

OF

UNIT

In

case

of

trouble,

etc.

necessitating

disassembly,

please

disassemble

in

the

order

shown

in

photographs.

Reassemble

in

reverse

order.

I

5

SCREWS

[

2

CABINET

SCREWS

BOTTOM

PLATE

FRONT

PANEL

SCREWS

SCREWS

CONTROL

KNOBS

il.

CONTROLS

NRO

=

oOnN

OO FW

.

SPEAKER

SYSTEM

SELECTOR

.

OUTPUT

POWER

LEVEL

METERS

(Left

and

Right)

.

METER

SWITCH

.

MODE

SWITCH

.

LOUDNESS

SWITCH

.

VOLUME

CONTROL

.

STEREO

BALANCE

CONTROL

.

INPUT

SELECTOR

.

POWER

SWITCH

10.

11.

2s.

13.

14.

15.

16.

17.

18.

HEADPHONE

JACK

AUDIO

MUTE

SWITCH

LOW

FILTER

SWITCH

HIGH

FILTER

SWITCH

TONE

SWITCH

BASS

TONE

CONTROL

TREBLE

TONE

CONTROL

POWER

INDICATOR

LAMP

TAPE

MONITOR

SWITCH

Fig.

1

Controls

IV.

PRINCIPAL

PARTS

LOCATION

LEFT

ch

HEAT

SINK

@

POWER

SWITCH

Swg0l

FUSE

TERMINAL

POWER

TRANSFORMER

CAPACITOR

C902

,903

iIOOOOpF

63V

ara

TAPE

RC

BOARD

M2-5435

SPEAKER

SYSTEM

sw90

£Q

AMP

PC

BOARD

M2-

5617A

_[e|_-

TONE

CONTROL

PC

BOARD

M2-5618

8

Li

if

it

©

POWER

LEVEL

METER

LEFT

M901

SELECTOR

2

POWER

LEVEL

METER

RIGHT

M902

HEADPHONE

JACK

J90I

'__

AUDIO

MUTE

SWITCH

SW4

MAIN

AMP

RC

BOARD

M2-

5432A

RIGHT

ch

HEAT

SINK

BASS

TONE

TREBLE

TONE

CONTROL

VRI

TONE

SWITCH

SWI

“—-HIGH

FILTER

SWITCH

SW3

=n

————e

oa

q

}

®

-—

PC

BOARD

M2-5619

Fig.

2

Top

View

METER

SWITCH

SW3

-—MODE

SWITCH

SWI

-—LOUDNESS

SWITCH

SW2

BALANCE

CONTROL

VRIA

VOLUME

CONTROL

|

INPUT

SELECTOR

VRIB

swt

LED

RC

BOARD

TAPE

MONITOR

SWITCH

M2-5617C

sw

CONTROL

VR2

POWER

INDICATOR

DI

“—

LOW

FILTER

SWITCH

Sw2

Fig.

3

Front

View

5

V.

LEVEL

DIAGRAM

LEVEL

IN

dB

Sa

30

20

~20

-40

-50

AUX

TAPE

MONITOR

(PIN)

TAPE

MONITOR

(DIN)

PHONO

SPEAKER

CONTROL

AMP

MAIN

AMP

HEADPHONES

|

_—

TAPE

REC(PIN)

TAPE

REC(DIN)

SPEAKER

OUTPUT

(29dB)

TAPE

MONITOR(DIN)!

AUX,

TUNER

TAPE

MONITOR(PIN):

150mA

(-14dB)

(EQ

AMP)

|

|

|

a

|

I

|

|

|

|

|

|

|

|

{

{

|

|

|

|

|

|

|

|

|

|

|

|

|

|

|

22V/8

OHMS

i

|

|

|

!

|

NN

|

av

(MAIN

AMP)

HEADPHONES

(4¢4B)

0.77V/

8

OHMS

:

(0dB)

(CONTROL

AMP)

TAPE

REC

(PIN)

1SOmv

(-14dB)

TAPE

REC(DIN)

30mv

(-28dB)

PHONO

3mvV

FREQUENCY

[kHz

4

(-48dB)

Fig.

4

Level

Diagram

of

Model

AM-2600

VI.

MAIN

AMPLIFIER

ADJUSTMENT

1.

IDLING

CURRENT

ADJUSTMENT

TESTER

IDLING

CURRENT

ADJ

(L

CHANNEL

)

VR

|

elie

a

~

Connect

a

tester

to

Power

Amp.

P.C

Board

test

point

between

Pin-11

and

Pin-12,

and

between

Pin-29

and

Pin-28.

Adjust

semi-fixed

resistors

VR-la,

VR-1b

until

the

volt-

age

is

30

mV.

2.

LEVEL

METER

ADJUSTMENT

SPEAKER

OUTPUT

AC

VOLTMETER

Aubio

osc

°

IKHz

Fig.

6

Level

Meter

Adjustment

a)

Connect

instruments

as

shown

in

Fig.

6.

b)

Turn

volume

control

knob

on

the

front

panel

until

the

AC

voltmeter

indicates

4.9

volts

(3

watts).

c)

Adjust

VR-3a,b

so

that

level-meter

indicates

3

watts.

(Refer

to

Fig.

7)

TESTER

Ae

IDLING

CURRENT

ADJ

("

(R

CHANNEL)

(4)

ui

TREb

a

TR3b

TRIb

tT

28

0

TR4b

|

|

<<)

TR7b

270

026

oO

23

24

25

Fig.

5

Main

Amp.

P.C

Board

M2-5432A

Fig.

7

Volume

P.C

Board

M2-5619

Vil.

CLASSIFICATION

OF

VARIOUS

P.C

BOARDS

i

1.

RELATION

OF

P.C

BOARD

TITLE

AND

IDENTIFICATION

NUMBER

7

PC

Board

Title

- ;

7

7

;

PC

Board

Number

a

"Main

Amplifier

PCBoard

_—

M25432

;

2

Tone

Control

P.C

Board

Po

M2-5618

=

Equalizer

P.C

Board

;

M2-5617

~

Volume

P.C

Board

_

Loe

M2-5619

Tape

P.C

Board

M2-5435_

Chart-1

2.

COMPOSITION

OF

VARIOUS

P.C

BOARDS

1)

MAIN

AMPLIFIER

P.C

BOARD

M2—5432

2ED

BdAj

344

3WVS

3H1

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