Akai PR-A04 User manual

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1

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STEREO

PRE-AMPLIFIER

MODEL

PR-AOQ4

DC

STEREO

POWER

AMPLIFIER

move.

PA=-WO4

PR-AO4

TABLE

OF

CONTENTS

SECTION

1

MODEL

PR-A04

...........

00.0

eee

eee

3

SECTION

2

MODEL

PA-W04

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

0.0

eee

eee

17

SECTION

«3°

PARTS

UIST

isis

jdiead

Seana

Sa

tiied

a

eens

33

SECTION

4

SCHEMATIC

DIAGRAM

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

54

IL

SS

25

VIL.

SECTION

1

STEREO

PRE-AMPLIFIER

MODEL

PR-A04:

ALSO

APPLICABLE

TO

BLACK

PANEL

MODEL

TABLE

OF

CONTENTS

TECHNICAL

DATA...

2...

ce

ee

te

teens

4

DISMANTLING

OF

UNIT.

2.0...

ee

ee

te

eee

5

CONTROES

©

isso

55

565

8

6S

pice

Seeing

BE

we

ea

a

ig

Ee

aa

ee

Sle

ee

go

6

PRINCIPAL

PARTS

LOCATION

........

0.

ce eee

eee

eee

eens

7

VOLTAGE

CONVERSION

..

1...

2...

ccc

ee

ee

ee

ene

8

ADJUSTMENT

..

1...

0...

e

ce

ee

eee

ere

ee

eet

eens

9

CLASSIFICATION

OF

VARIOUS

P.C

BOARDS

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

10

1.

P.C

BOARD

TITLES

AND

IDENTIFICATION

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

10

2.

COMPOSITION

OF

VARIOUS

P.C

BOARDS

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

.

ll

I.

TECHNICAL

DATA

INPUT

SENSITIVITY/IMPEDANCE/

SIGNAL

TO

NOISE

RATIO

(IHF

“A”)

PHONO

1/2

(MM)

PHONO

1

(MC)

3

mV/47

kohms/82

dB

0.08

mV/10

ohms/75

dB

TUNER

150

mV/47

kohms/102

dB

AUX

150

mV/47

kohms/102

dB

TAPE

PLAY

1

PIN:

150

mV/47

kohms/102

dB

DIN:

150

mV/100

kohms/80

dB

TAPE

PLAY

2

PIN:

150

mV/47

kohms/102

dB

OUTPUT

LEVEL/IMPEDANCE

TAPE

REC

1

PIN:

150

mV/600

ohms

DIN:

30

mV/30

kohms

TAPE

REC

2

PIN:

150

mV/600

ohms

OUTPUT

1

V/600

ohms

RATED

LOAD

IMPEDANCE

47

kohms

PHONO

MAX.

INPUT

LEVEL

(1

kHz)

PHONO

1/2

(MM)

PHONO

1

(MC)

400

mV

10

mV

FREQUENCY

RESPONSE

TUNER/AUX/TAPE

PLAY

1,

2

PHONO

1/2

(MM)

(RIAA

curve

deviation)

PHONO

1

(MC)

(RIAA

curve

deviation)

TOTAL

HARMONIC

DISTORTION

(20

Hz

to

20

kHz)

TUNER/AUX/TAPE

PLAY

1,

2

PHONO

1/2

(MM)

PHONO

1

(MC)

5

Hz

to

100

kHz

+

0.5

dB

30

Hz

to

15

kHz

+

0.2

dB

30

Hz

to

15

kHz

+

0.2

dB

0.005%

at

output

10

V

0.005%

at

output

10

V

0.005%

at

output

10

V

(Volume

control

set

at

Max.

position)

TONE

CONTROL

BASS

TREBLE

SUBSONIC

FILTER

HIGH

FILTER

CHANNEL

SEPARATION

(AUX)

+8

dB

at

100

Hz

+8

dB

at

10

kHz

12

dB/oct.

at

18

Hz

12

dB/oct.

at

10

kHz

70

dB

(Shorted

Circuit)

MISCELLANEOUS

SEMICONDUCTORS

je

Transistors:

16,

Diodes:

15,

FETs:

2,

ICs:

6

POWER

REQUIREMENTS

120

V,

60

Hz

for

U.S.A.

and

Canada

Models

220

V,

50

Hz

for

Europe

except

UK

Models

240

V,

50

Hz

for

UK

and

Australia

Models

110/120/220/240

V,

50/60

Hz

internally

Switchable

for

other

countries

Models

POWER

CONSUMPTION

DIMENSIONS

(W

x

H

x

D)

WEIGHT

15

W

440

x

78

x

313

mm

(17.3

x

3.1

x

12.3

inches)

6.1

kg

(13.4

Ibs)

*

For

improvement

purposes,

specifications

and

design

are

subject

to

change

without

notice.

i.

DISMANTLING

OF

UNIT

In

case

of

trouble,

etc.

necessitating

dismantling,

please

dismantle

in

the

order

shown

in

the

photographs.

Reassemble

in

reverse

order.

SCREWS

SCREWS

FRONT

PANEL

SCREWS

SCREWS

UPPER COVER

ON

OAAN

>

11.

12.

13.

14,

15.

CONTROLS

POWER

SWITCH

BASS

CONTROL

FILTER

SWITCHES

MODE

SELECTOR

LOUDNESS

SWITCH

VOLUME

CONTROL

dB

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.

.

AC

OUTLETS

ms

NUMBER

UNSWITCHED

SWITCHED

BAD

41265-55150

iu

ARASH

COS

MADR

AAR

SHOCK

BAZARD

1

OPER!

aiSaHE

OE

cuss

iS

ERLEVER

!

fe

ree

DERUEREMGSELFANR

-MICKT

SFFAER

/

TOTAL

TOOW

MAK?

%

,

200WMAX

|.

SAITIIIE

tn

case

of

use

outside

of

indicated

AC

110-2409

power

source

ares,

consult

our

sarvice

shop

for

necessary

convermon.

§0/60Hz

15W

Fig.

1

Controls

TUNER

TERMINALS

AUX

TERMINALS.

TAPE

1

SYSTEM

REC/PLAY

TERMINALS

TAPE

1

SYSTEM

DIN

JACK

(Some

models

do

not

have

this

facility)

TAPE

2

SYSTEM

REC/PLAY

TERMINALS

OUTPUT

TERMINALS

AC

OUTLETS

(Some

models

do

not

have

this

facility)

AC

CORD

(Some

models

are

equipped

with

an

AC

Inlet

instead

of

an

AC

cord.

Connect

with

an

appropriate

power

cord.)

:

PHONO

2

INPUT

JACKS

PHONO

1

INPUT

JACKS

|

|

|

;

iV.

PRINCIPAL

PARTS

LOCATION

ae

ce

Be

A

FILTER

REC

SELECTOR

SWITCHES

:

SWITCH

SW

4

HIGH

BASS

sw4

LOUDNESS

VOLUME

LED

P.C

BOARD

CONTROL

SUBSONIC

CONTROL

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.

2

Front

View

POWER

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.

3

Top

View

V.

VOLTAGE

CONVERSION

SCREW

Seem

Ceemrarere

|

IS

sr

ATES

SER

CE

LC

RNS

aa

FUSE

PC

BOARD

(PRA-

4003)

=

POWER

SWITCH

ry

i

POWER

TRANS,

Fig.

4

Voltage

Conversion

(U/T

Model)

1.

U/T

Model

(Refer

to

Fig.

4)

1)

Switch

OFF

the

power

supply

and

remove

the

plug

from

the

mains

supply.

2)

Loosen

holding

screws

and

remove

the

top

panel.

3)

Remove

the

screw

holding

the

Fuse

P.C

Board

located

near

the

power

transformer.

4)

Remove

existing

Line

Voltage

Fuse

and

insert

required

Line

Voltage

Fuse

in

the

proper

fuse

holder.

110V

:

800mA

250V

220V

:

400mA

250V

240

V

:

400

mA

250V

’

2.

Models

other

than

U/T

No

voltage

conversion.

VIL

ADJUSTMENT

REAR

PANEL

sw4

sw3

Sswi-2

icp

SWwI-1

=

Ta

aun

Center

Center

Off-set

Off-set

Voltage

+0

pe

Voltage

(O00

nooo

@

|

@

IK

ohm

IK

ohm

ml

Fl

rel

wae?

O1O

Ono

FRONT

PANEL

DC

Voltmeter

Lee

eee

Fig.

5

Pre

Amp

P.C

Board

PRA-4001A

CENTER

OFF-SET

VOLTAGE

ADJUSTMENT

(Refer

to

Fig.

5)

Connect

the

Digital

Voltmeter

or

DC

Voltmeter

between

the

test

point

on

the

Pre

Amp

PC

_

Board

PRA-4001A

and

the

ground.

Adjust

the

VR

1

(1

kohm)

so

that

Voltmeter

reading

is

0+0.5V.

|

|

VIL

CLASSIFICATION

OF

VARIOUS

P.C

BOARDS

1.

P.C

BOARD

TITLES

AND

IDENTIFICATION

NUMBERS

P.C

Board

Number

P.C

Board

Title

PRA-4001A

j

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

10