Akai PR-A04 Bedienungsanleitung

STEREO

PRE-AMPLIFIER

MODEL

PR-AOQ4

STEREO

POWER

AMPLIFIER

move.

PA=-WO4

PR-AO4

TABLE

CONTENTS

SECTION

MODEL

PR-A04

...........

00.0

eee

SECTION

MODEL

PA-W04

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

0.0

eee

SECTION

«3°

PARTS

UIST

isis

jdiead

Seana

tiied

eens

SECTION

SCHEMATIC

DIAGRAM

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

VIL.

SECTION

STEREO

PRE-AMPLIFIER

MODEL

PR-A04:

ALSO

APPLICABLE

BLACK

PANEL

MODEL

TABLE

CONTENTS

TECHNICAL

DATA...

2...

teens

DISMANTLING

UNIT.

2.0...

eee

CONTROES

isso

565

pice

Seeing

Sle

PRINCIPAL

PARTS

LOCATION

........

ce eee

eee

eens

VOLTAGE

CONVERSION

1...

2...

ccc

ene

ADJUSTMENT

1...

0...

eee

ere

eet

eens

CLASSIFICATION

VARIOUS

P.C

BOARDS

..........-..-.+--:

P.C

BOARD

TITLES

AND

IDENTIFICATION

NUMBERS...........-

COMPOSITION

VARIOUS

P.C

BOARDS

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

TECHNICAL

DATA

INPUT

SENSITIVITY/IMPEDANCE/

SIGNAL

NOISE

RATIO

(IHF

“A”)

PHONO

1/2

(MM)

PHONO

(MC)

mV/47

kohms/82

0.08

mV/10

ohms/75

TUNER

150

mV/47

kohms/102

AUX

150

mV/47

kohms/102

TAPE

PLAY

PIN:

150

mV/47

kohms/102

DIN:

150

mV/100

kohms/80

TAPE

PLAY

PIN:

150

mV/47

kohms/102

OUTPUT

LEVEL/IMPEDANCE

TAPE

REC

PIN:

150

mV/600

ohms

DIN:

mV/30

kohms

TAPE

REC

PIN:

150

mV/600

ohms

OUTPUT

V/600

ohms

RATED

LOAD

IMPEDANCE

kohms

PHONO

MAX.

INPUT

LEVEL

kHz)

PHONO

1/2

(MM)

PHONO

(MC)

400

FREQUENCY

RESPONSE

TUNER/AUX/TAPE

PLAY

PHONO

1/2

(MM)

(RIAA

curve

deviation)

PHONO

(MC)

(RIAA

curve

deviation)

TOTAL

HARMONIC

DISTORTION

(20

kHz)

TUNER/AUX/TAPE

PLAY

PHONO

1/2

(MM)

PHONO

(MC)

100

kHz

0.5

kHz

0.2

kHz

0.2

0.005%

output

0.005%

output

0.005%

output

(Volume

control

set

Max.

position)

TONE

CONTROL

BASS

TREBLE

SUBSONIC

FILTER

HIGH

FILTER

CHANNEL

SEPARATION

(AUX)

100

kHz

dB/oct.

kHz

(Shorted

Circuit)

MISCELLANEOUS

SEMICONDUCTORS

Transistors:

16,

Diodes:

15,

FETs:

ICs:

POWER

REQUIREMENTS

120

for

U.S.A.

and

Canada

Models

220

for

Europe

except

Models

240

for

and

Australia

Models

110/120/220/240

50/60

internally

Switchable

for

other

countries

Models

POWER

CONSUMPTION

DIMENSIONS

WEIGHT

440

313

(17.3

3.1

12.3

inches)

6.1

(13.4

Ibs)

For

improvement

purposes,

specifications

and

design

are

subject

change

without

notice.

DISMANTLING

UNIT

case

trouble,

etc.

necessitating

dismantling,

please

dismantle

the

order

shown

the

photographs.

Reassemble

reverse

order.

SCREWS

FRONT

PANEL

SCREWS

UPPER COVER

OAAN

11.

12.

13.

14,

15.

CONTROLS

POWER

SWITCH

BASS

CONTROL

FILTER

SWITCHES

MODE

SELECTOR

LOUDNESS

SWITCH

VOLUME

CONTROL

VOLUME

SCALE

INPUT

SELECTOR

INDICATOR

INPUT

SELECTOR

PHONO

SELECTOR

REC

(Recording)

SELECTOR

STEREO

BALANCE

CONTROL

CAPACITANCE

CONTROL

GROUND

TERMINALS

16.

17.

18.

19.

20.

21.

22.

23.

24.

25.

OUTLETS

NUMBER

UNSWITCHED

SWITCHED

BAD

41265-55150

ARASH

COS

MADR

AAR

SHOCK

BAZARD

OPER!

aiSaHE

cuss

ERLEVER

ree

DERUEREMGSELFANR

-MICKT

SFFAER

TOTAL

TOOW

MAK?

200WMAX

SAITIIIE

case

use

outside

indicated

110-2409

power

source

ares,

consult

our

sarvice

shop

for

necessary

convermon.

§0/60Hz

15W

Fig.

Controls

TUNER

TERMINALS

AUX

TERMINALS.

TAPE

SYSTEM

REC/PLAY

TERMINALS

TAPE

SYSTEM

DIN

JACK

(Some

models

not

have

this

facility)

TAPE

SYSTEM

REC/PLAY

TERMINALS

OUTPUT

TERMINALS

OUTLETS

(Some

models

not

have

this

facility)

CORD

(Some

models

are

equipped

with

Inlet

instead

cord.

Connect

with

appropriate

power

cord.)

PHONO

INPUT

JACKS

PHONO

INPUT

JACKS

;

iV.

PRINCIPAL

PARTS

LOCATION

FILTER

REC

SELECTOR

SWITCHES

SWITCH

HIGH

BASS

sw4

LOUDNESS

VOLUME

LED

P.C

BOARD

CONTROL

SUBSONIC

CONTROL

PRA-4002B

VR2

sw3

swe

vRI

INPUT

TREBLE

MODE

BAL

ANCE

SELECTOR

CONTROL

SWITCH

CONTROL

SWITCH

VRI

Swi VRt

SW3

PHONO

SELECTOR

SWITCH

swi

Fig.

Front

View

POWER

PRE

AMP.

CAPACITANCE

SWITCH

TRANSFORMER

P.C

BOARD

CONTROL

SWITCH

Swgol

T901

PRA-4001A

swe

FUSE

P.C

BOARD

PRA-4003

(U/T)

TONE

CONTROL

VOLUME

P.C

BOARD

P.C

BOARD

PRA-4002A

PRA-4001C

Fig.

Top

View

VOLTAGE

CONVERSION

SCREW

Seem

Ceemrarere

ATES

SER

RNS

FUSE

BOARD

(PRA-

4003)

POWER

SWITCH

POWER

TRANS,

Fig.

Voltage

Conversion

(U/T

Model)

U/T

Model

(Refer

Fig.

Switch

OFF

the

power

supply

and

remove

the

plug

from

the

mains

supply.

Loosen

holding

screws

and

remove

the

top

panel.

Remove

the

screw

holding

the

Fuse

P.C

Board

located

near

the

power

transformer.

Remove

existing

Line

Voltage

Fuse

and

insert

required

Line

Voltage

Fuse

the

proper

fuse

holder.

110V

800mA

250V

220V

400mA

250V

240

400

250V

’

Models

other

than

U/T

voltage

conversion.

VIL

ADJUSTMENT

REAR

PANEL

sw4

sw3

Sswi-2

icp

SWwI-1

aun

Center

Off-set

Voltage

(O00

nooo

ohm

rel

wae?

O1O

Ono

FRONT

PANEL

Voltmeter

Lee

eee

Fig.

Pre

Amp

P.C

Board

PRA-4001A

CENTER

OFF-SET

VOLTAGE

ADJUSTMENT

(Refer

Fig.

Connect

the

Digital

Voltmeter

between

the

test

point

the

Pre

Amp

Board

PRA-4001A

and

the

ground.

Adjust

the

kohm)

that

Voltmeter

reading

0+0.5V.

VIL

CLASSIFICATION

VARIOUS

P.C

BOARDS

P.C

BOARD

TITLES

AND

IDENTIFICATION

NUMBERS

P.C

Board

Number

P.C

Board

Title

PRA-4001A

Pre

Amp

P.C

Board

Switch

P.C

Board

PRA-4001B

Volume

P.C

Board

PRA-4001C

Tone

Control

P.C

Board

PRA-4002A

PRA-4002B

PRA-4003

PRA-4004

PRA-4005

PRA-4042

Chart-l

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