Akai GX-A5 Manuale utente

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AKAT

Service

manuar

STEREO

CASSETTE

DECK

moveLG

X-A5

/X

ABBREVIATIONS

FOR

SERVICE

MANUAL

moveLGX-A5/X

ABBREVIATION

EXPLANATION

AC

Alternating

Current

ADJ

ADJustment

(ADJust)

AR

Anti

Record

AS

Anti

Saturation

B(B-L/B-H)

Buffer

(Buffer

Low

level

stage/Buffer

High

level

stage)

CCA

Current

Control

Amprifire

DC

Direct

current

DIN

Deutshe

Industrie

Normen

EQ

EQualizer

FF

Fast

Forward

FL

DISPLAY

(FLD)

FLuorescent

DISPLAY

FREQ

FREQuency

GND

GrouND

H

High

level

HD

High

Density

INT

INTerrupt

L

Low

level

L

Left

MID

MIDdle

MPX

Multe

PleX

NR

Noise

Reduction

Osc

OSCillator

OSS

(OSS-L/OSS-H)

Over

Shoot

Supresser

(Over

Shoot

Supresser

Low

level

stage/

Over

Shoot

Supresser

High

level

stage)

PB

Play

Back

R

Right

R(R-L/R-H)

Rectifier

(Low

level

stage/Rectifier

High

level

stage)

REC

RECord

REG

REGulator

RES

RESet

REW

REWind

RMS

Root

Mean

Square

SC

(SC-L/SC-H)

Side

Change

(SideChange

Low

level

stage/Side

Change

High

level

stage)

SENS

SENSitivity

Ss

Spectral

Skewing

network

sw

SWitch

VR

Variable Resistor

VREF

Voltage

REFerence

STEREO

CASSETTE

DECK

MODEL

GX-A5/X

SECTION

1

SERVICEMANUAL

...

SECTION

2

PARTSLIST

.........

ee

emeweens

SERVICE

MANUAL

GX-A5/X

SAFETY

INSTRUCTIONS

SAFETY

CHECK

AFTER

SERVICING

Confirm

the

specified

insulation

resistance

between

power

cord

plug

prongs

and

externally

exposed

parts

of

the

set

is

greater

than

10

Mohms,

but

for

equipment

with

external

antenna

terminals

(tuner,

receiver,

etc.)

and

is

intended

for

{[C]

or

,

specified

insulation resistance

should

be

more

than

2.2

Mohms

(ground

terminals,

microphone

jacks,

headphone

jacks.

line-in-out

jacks

etc.)

PRECAUTIONS

DURING

SERVICING

1.

2:

OES

Parts

identified

by

the

A\

symbol

parts

are

critical

for

safety.

Replace

only

with

parts

number

specified.

In

addition

to

safety,

other

parts

and

assemblies

are

specified

for

conformance

with

such

regulations

as

those

applying

to

spurious

radiation.

These

must

also

be

replaced

only

with

specified

replacements.

Examples:

RF

-converters,

tuner

units,

antenna

selector

switches,

RF

cables,

noise

blocking

capacitors,

noise

blocking

filters,

etc.

Use

specified

internal

wiring.

Note

especially:

1)

Wires

covered

with

PVC

tubing

2)

Double

insulated

wires

3)

High

voltage

leads

Use

specified

insulating

materials

for

hazardous

live

parts.

Note

especially:

1)

Insulation

Tape

2)

PVC

tubing

3)

Spacers

(Insulating

Barriers)

4)

Insulation

sheets

for

transistors

5)

Plastic

screws

for

fixing

microswitch

(especially

in

turntable)

When

replacing

AC

primary

side

components

(transformers,

power

cords,

noise

blocking

capacitors,

etc.),

wrap

ends

of

wires

securely

about

the

terminals

before

soldering.

>

c>

Observe

that

wires

do

not

contact

heat

producing

parts

(heatsinks,

oxide

metal

film

resistors,

fusible

resistors,

etc.).

Check

that

replaced

wires

do

not

contact

sharp

edged

or

pointed

parts.

Also

check

areas

surrounding

repaired

locations.

Use

care

that

foreign

objects

(screws,

solder

droplets,

etc.)

do

not

remain

inside

the

set.

VOLTAGE

CONVERSION

Models

for

Canada,

USA,

Europe,

UK

and

Australia

are

not

equipped

with

this

facility.

Each

machine

is

preset

at

the

factory

according

to

its

destination,

but

some

machines

can

be

set

to

110V,120V,220V,

or

240V

as

required.

If

your

machine’s

voltage

can

be

converted:

Before

connecting

the

power

cord,

turn

the

VOLTAGE

SELECTOR

located

on

the

rear

panel

with

a

screwdriver

until

the

correct

voltage

is

indicated.

VOLTAGE

SELECTOR

CYCLE

CONVERSION

Cycle

conversion

are

not

necessary

since

GX—AS

and

GX—A5X

use

a

DC

MOTOR.

SERVICE

MANUAL

GX-A5/X

Vi.

vil.

Vill.

kK.

x.

SECTION

1

SERVICE

MANUAL

TABLE

OF

CONTENTS

SPECIFICATIONS

DISMANTLING

OF

UNIT

..

CONTROLS

PRINCIPAL

PARTS

LOCATION

..

MEMORY-REPEAT

SWITCH

AND

AUTO

SYSTEM

...

1,

SF

MEMORY

REPEAT.

2.

SF

MEMORY

REPEAT...

3.

MEMORY-REPEAT

SWITCH

AND

SYSTEM

.

ACTIONS

OF

SYSTEM

CONTROL

IC

LM6504-145

.

1.

ACTION

OF

AND

RWD

PLUNGERS

2.

TAPE

SELECTOR

OPERATION

.....

MECHANICAL

AND

HEAD

ADJUSTMENT

..

1.

PINCH

ROLLER

PRESSURE

MEASUREMENT

2.

WINDING

TORQUE

MEASUREMENT

IN

EACH

MODE

..

3.

TAPE

SPEED

ADJUSTMENT

4.

REC/PB

HEAD

AZIMUTH

ADJUSTMENT

...

AMPLIFIER

ADJUSTMENT

DC

RESISTANCE

OF

VARIOUS

COILS

PC

BOARD

TITLES

AND

IDENTIFICATION

NUMBERS

..

COCCHMMOIAUSD

For

basic

adjustments,

measuring

methods,

and

operating

principles,

refer

to

GENERAL

TECHNICAL

MANUAL.

‘SERVICE

MANUAL

GX-AS/X

I.

SPECIFICATIONS

MOTOR

Electronically

speed

controlled

DC

motor

for

capstan

drive

x

1

HEADS

Twin

Field

Super

GX

head

for

recording

and

playback

x

1

Erase

head

x

1

WINDING

TIME

90

sec.

(C-60

tape)

WOW

&

FLUTTER

0.05%

(WRMS),

0.12%

(DIN.

WTD)

DISTORTION

0.65%

(Metal)

FREQUENCY

RESPONSE

Metal

20Hz

to

19,000Hzt3dB

CrO2

20Hz

to

18,000Hz+3dB

Normal

20Hz

to

17,000Hz+3dB

S/N

60dB

(Metal)

Dolby

C

type

NR

ON:

Improves

up

to

15dB

at

500Hz,

20dB

at

1kHz

to

10kHz

Dolby

B

type

NR

ON:

Improves

up

to

5dB

at

1kHz,

10dB

above

SkHz

DYNAMIC

RANGE

(dbx

ON)

115dB

(GX—A5X

ONLY)

INPUT

SENSITIVITY

/IMPEDANCE

LINE

70mV/47kohms

MIC

2.5mV/Skohms

OUTPUT

SENSITIVITY/IMPEDANCE

LINE

380mV/1.2kohms

PHONES

0.3mW

(at

8

ohms)/91

ohms

POWER

REQUIREMENTS

120V,

60Hz

for

USA

&

Canada

220V,

50Hz

for

Europe

except

UK

240V,

SOHz

for

UK

&

Australia

110V/120V/220V/240V,

50/60Hz

switchable

for

other

countries

DIMENSIONS

440

(W)

x

104

(H)

x

285

(D)

mm

(17.3

x

4.1

x

11.2

inches)

WEIGHT

4.1kg

(9.0

Ibs)

*

For

improvement

purposes,

specifications

and

design

are

subject

to

change

without

notice.

*

Noise

Reduction

manufactured

under

license

from

Dolby

Laboratories

Licensing

Corporation.

“Dolby”

and

the

double-D

symbol

are

trade

marks

of

Dolby

Laboratories

Licensing

Corporation.

*

“dbx”

is

Trademark

of

dbx

Incorporated.

SERVICE

MANUAL

GX-A5/X:

Il.

DISMANTRING

OF

UNIT

In

case

of

trouble,

etc.

necessitating

dismantling,

please

dismantle

in

the

order

shown

in

the

photographs.

Reassemble

in

reverse

order.

UPPER

COVER

REAR

PANEL

a

f

q

SCREWS

FRONT

PANEL

sw

GT

SCREWS

F

SCREWS

SERVICE

MANUAL

GX-A5/X:

tl.

CONTROLS

AKAI

dbx

cose)

Fig.

3-1

Front

View

(GX—A5X)

®

ans

ana

OA

kay

ges

Encre

warscTRED

ace

uve

As

HE

EEK

RP

Flow

ey

Caveats

Utena

oa

i

"tier?

Ai

Soome

rasta

a

amin

ea

a

car

nates

teeing

nrc

Wah

KEE

OF

Sta

SX

ISS,

BLE

(ir

aa

©© ©©

AKAI

ELECTRIC

CO,

UID.

Prcooes

nesses

OX-ASY

‘A

norpovzagraoy

Bree

Fig.

3-2

Rear

View

({U)

MODEL)

1.

POWER

SWITCH

10.

MEMORY

BUTTON

2.

CASSETTE

HOLDER

11.

REPEAT

BUTTON

3.

EJECT

BUTTON

12.

REC

LEVEL

CONTROLS

4.

FL

DISPLAY

13.

MICROPHONE

(L/R)

JACKS

5.

COUNTER

RESET

BUTTON

14.

HEADPHONE

JACK

6.

TIMER

START

SWITCH

15.

REMOTE

JACK

7.

dbx

and

DOLBY

NR

BUTTONS

16.

LINE

IN/OUT

(L/R)

JACKS

(MODEL

GX-A5

EXCEPT

dbx

BUTTONS)

17.

VOLTAGE

SELECTOR

SWITCH

((U]

MODEL

ONLY)

8,

OPERATION

BUTTONS

18.

AC

POWER

CORD

9.

MPX

FILTER

BUTTON

SERVICE

MANUAL

GX-A5/X:

IV.

PRINCIPAL

PARTS

LOCATION

ONTROL(A)

PCB

POWER

SW

DETECTOR

PCB

REW

PLUNGER

SYSTEM

Ci

swt

CMSOID5010

SL9O1

FL

DISPLAY

INI

T2062A5024

JACK

PCB

MIC

JACKS

JI

REC

VR

VRI

REC

VR

PCB

T2062A50IC T2062A501B

Fig.

4-1

Front

View

FF

PLUNGER

SL902

HEADPHONE

JACK

J2

POWER

TRANSFORMER

T90!

Teoez-u

U)

T2062-ac

[A.C]

VOLTAGE

SELECTOR

Teo62-ev

(E}

swsol

PRE

AMP

PCB

T2062-8S

[8.5]

(Uj)

MODEL

ONLY)

T2062A501A

REMOTE

JACK

J2

SYSTEM

CONTROL(B)

PCB

7206245028

CONNECTOR

PCB

CAPSTAN

MOTOR

POWER

SW

SWI

POWER

SUPPLY

PCB

cmso1ns020

Mao!

T206285030

[0]

MMI-6A2LKFD

7206285031

7206285032

[E.8.5)

Fig.

4-2

Top

View

SERVICE

MANUAL

GX-A5/X

7

V.

MEMORY-REPEAT

SWITCH

AND

AUTO

SYSTEM

S-F

MEMORY

REPEAT

AND

Z-F

S

....

Start

Point

(beginning

of

tape)

MEMORY

REPEAT

F....

Free

Point

(counter

point

when

REW

and

PLAY

keys

are

pressed

simultaneously)

.

Zero

(0000)

point

of

the

counter.

5-1

SF

MEMORY

REPEAT

The

function

is

to

playback

repeatedly

from

the

tape

beginning

to

the

free

point

(when

REW

and

PLAY

5-3

MEMORY-REPEAT

SWITCH

AND

SYSTEM

keys

are

pressed

simultaneously).

It

can

be

used

for

repeating

the

first

tune

of

the

tape

or

one

measure-

ment.

5-2.

Z

>

F

MEMORY

REPEAT

The

function

is

to

playback

repeatedly

from

the

zero

(0000)

point

of

the

counter

to

the

free

point

(when

REW

and

PLAY

are

pressed

simultaneously).

It

can

be

used

for

repeating

a

tune

on

the

way

or

a

certain

part

of

a

tune.

SERVICE

MANUAL

GX-A5/X'

MEMORY

SW

OFF

OFF

ON

ON

REPEAT

SW

OFF

ON

OFF

ON

Key

input

<a

<I

<a

<Kl

AUTO

STOP

AUTO

REPEAT

MEMORY

STOP

MEMORY

REPEAT

Operation

REW

~

(Tape

End)

REW

~+

(Tape

Top)

REW

~

(0000)

REW

+

(0000)

STOP

-

PLAY

+

(Tape

End)

STOP

+

PLAY

+

(Tape

End)

Key

input

<KI+D>

<KI+>

<Kl+

D>

<Kl+>

AUTO

PLAY

S-F

MEMORY

REPEAT

MEMORY

PLAY

Z+F

MEMORY

REPEAT

Operation

REW

+

(Tape

Top)

REW

+(Tape

Top)

REW

-

(0000)

REW

~

(0000)

+

PLAY

~

(Tape

End)

|

+

PLAY

(Free

Point)

|

+

PLAY

(Tape

End)

|

-+

PLAY

—

(Free

Point)

J

STOP STOP

Key

input

> > >

>

AUTO

STOP

AUTO

REPEAT

AUTO

STOP

MEMORY

REPEAT

Operation

PLAY

=

(Tape

End)

PLAY

~

(Tape

End)

PLAY

=

(Tape

End)

PLAY

~

(Tape

End)

STOP

+

REW

+

(Tape

Top)

STOP

+

REW

+

(0000)

Key

input

O+rD>

Ore Ore

Or>

AUTO

STOP

AUTO

REPEAT

AUTO

STOP

MEMORY

REPEAT

Operation

REC

~

(Tape

End)

REC

+

(Tape

End)

REC

+

(Tape

End)

REC

=

(Tape

End)

STOP

+

REW~

(Tape

Top)

STOP

+

REW

~>

(0000)

~+

PLAY

———_|

+

PLAY

Chart

5-1