JVC A-GX1 Manuale utente

A-GX1/A-GX1B

JVC

SERVICE

MANUAL

A-GX1

Silver

Contents

Page

Safety

PrecalitiOns

siiccamiseteeraietencteies,

SPST

3.

BIOCK

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Service

PreCautiOns...........cccssccccssssssserescceessscrseeseesnceee,

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Wiring

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5.

Schematic

Diagram

2.

Removal

and

Reassembly

Procedures..................

1-3

Parts

List.........c

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S@Parate-volun

€

Insertion

QD

Or

o

Py

No,

2810

This

manual

combines

two

single

volumes;

Service

manual

and

Parts

list.

Feb

1985

\-GX1/A-GX1B

Safety

Precautions

1.

The

design

of

this

product

contains

special

hardware,

duct

is

safe

to

operate

without

danger

of

electrical

many

circuits

and

components

specially

for

safety

pur-

poses.

For

continued

protection,

no

changes

should

be

made

to

the

original

design

unless

authorized

in

writing

by

the

manufacturer.

Replacement

parts

must

be

identical

to

those

used

in

the

original

circuits.

Service

should

be

performed

by

qualified

personnel

only.

.

Alterations

of

the

design

or

circuitry

of

the

product

should

not

be

made.

Any

design

alterations

or

addi-

tions

will

void

the

manufacturer's

warranty

and

will

further

relieve

the

manufacturer

of

responsibility

for

personal

injury

or

property

damage

resulting

therefrom.

.

Many

electrical

and

mechanical

parts

in

the

product

have

special

safety-related

characteristics.

These

char-

acteristics

are

often

not

evident

from

visual

inspection

nor

can

the

protection

afforded

by

them

necessarily

be

obtained

by

using

replacement

components

rated

for

higher

voltage,

wattage,

etc.

Replacement

parts

which

have

these

special

safety

characteristics

are

identified

in

the

parts

list

of

Service

manual.

Electrical

compo-

nents

having

such

features

are

identified

by

shading

on

the

schematics

and

by

(

A

)

on

the

parts

list

in

Service

manual.

The

use

of

a

substitute

replacement

which

does

not

have

the

same

safety

characteristics

as

the

re-

commended

replacement

part

shown

in

the

parts

list

in

Service

manual

may

create

shock,

fire,

or

other

hazards.

.

The

leads

in

the

products

are

routed

and

dressed

with

ties,

clamps,

tubings,

barriers

and/or

the

like

to

be

sep-

arated

from

live

parts,

high

temperature

parts,

moving

parts

and/or

sharp

edges

for

the

prevention

of

electric

shock

and

fire

hazard.

When

service

is

required,

the

original

lead

routing

and

dress

should

be

observed,

and

they

should

be

con-

firmed

to

be

returned

to

normal,

after

reassembling.

.

Leakage

current

check

(Safety

for

electrical

shock

hazard)

After

reassembling

the

product,

always

perform

an

iso-

lation

check

on

the

exposed

metal

parts

of

the

Products

(antenna

terminals,

Knobs,

metal

cabinet,

screw

heads,

headphone

jack,

control

shafts,

etc.)

to

be

sure

the

pro-

Service

Precautions

1.

Before

repairing,

be

sure

to

discharge

the

large

electro-

lytic

Capacitors

across

a

resistor

of

about

100

ohms/1

watt.

m@

When

disassembling

1.

When

replacing

a

power

transistor

or

IC,

be

sure

to

apply

silicone

grease

to

the

section

of

a

new

transistor

or

IC

whichis

in

close

contact

with

the

heatsink,

then

mount

it.

1-1

(No.

2810)

CHECKING

YOUR

LINE

VOLTAGE

(For

U.S.

Military

Market

and

Other

Countries)

Before

inserting

the

power

plug,

please

check

this

setting

to

see

that

it

corresponds

with

the

line

voltage

in

your

area.

If

it

doesn’t

be

sure

to

adjust

the

voltage

selector

switch

to

the

proper

setting

before

operat-

ing

this

equipment.

The

voltage

selector

switch

is

located

on

the

rear

panel.

CAUTION:

Before

selecting

the

“Voltage

selector

switch”

to

proper

voltage

disconnect

the

power

plug.

shock.

Do

not

use

a

line

isolation

transformer

during

this

check.

|

@

Plug

the

AC

line

cord

directly

into

the

AC

outlet.

Us-

ing

a

“Leakage

Current

Tester’,

measure

the

leakage

current

from

each

exposed

metal

part

of

the

cabinet,

particularly

any

exposed

metal

part

having

a

return

path

to

the

chassis,

to

a

known

good

earth

ground.

Any

leakage

current

must

not

exceed

0.5

mA

AC

(r.m.s.).

@

Alternate

check

method.

Plug

the

AC

line

cord

directly

into

the

AC

outlet.

Use

an

AC

voltmeter

having

1,000

ohms

per

volt

or

more

sensitivity

in

the

following

manner.

Connect

a

15002

10W

resistor

paralleled

by

a

0.15

uF

AC-

type

capacitor

between

an

exposed

metal

part

and

a

known

good

earth

ground.

Measure

the

AC

voltage

across

the

resistor

with

the

AC

voltmeter.

Move

the

resistor

connection

to

each

exposed

metal

part,

particularly

any

exposed

metal

part

having

a

re-

turn

path

to

the

chassis,

and

measure

the

AC

voltage

across

the

resistor.

Now,

reverse

the

plug

in

the

AC

outlet

and

repeat

each

measurement.

Any

voltage

measured

must

not

exceed

0.75V

AC

(r.m.s.).

This

corresponds

to

0.5

mA

AC

(r.m.s.).

AC

VOLTMETER

(HAVING

1000.2/V,

OR

MORE

SENSITIVITY)

PLACE

THIS

PROBE

>

ON

EACH

EXPOSED

METAL

PART

15002

10W

GOODEARTH

GROUND

Fig.

1

2.

When

remeving

or

stretching

wires

on

the

P.

C.

Board,

be

sure

to

restore

them

to

their

original

routing

as

far

as

possible.

1.

Specifications

:

30

watts

per

channel,

min.

RMS,

both

channels

driven

into

8

ohms

from

40

Hz

to

20

kHz,

with

no

more

than

0.9%

total

harmonic

distor-

tion.

(U.S.A.

and

Canada

only)

33

watts

per

channel,

min.

RMS,

both

channels

driven,

into

8

ohms

at

1

kHz

with

no

more

than

0.9%

total

harmon-

ic

distortion.

(U.S.A.

and

Canada

only)

30

watts

per

channel,

min.

RMS,

both

channels

driven,

into

8

ohms

at

1

kHz

with

on

more

than

0.9%

total

harmon-

Output

Power

ic

distortion.

Total

Harmonic

:

0.08%

at

15

watts

output,

Distortion

1

kHz,

8ohms

-

1O0Hz—

30

kHz

(‘66

IHF,

both

channels

driven,

8

ohms,

0.7%

Power

Band

Width

THD)

Frequency

Response

:

10Hz-50

kHz

+1

dB,-3

dB

(8

ohms)

Tone

Controls

BASS

:

100

Hz

+8

dB

TREBLE

>

10kHz

+8

dB

Differences

Between

Models

Intended

For

Different

Areas

AC

voltage

selector

Not

fitted

U.S.A.

&

Canada

Continental

Europe

U.K.

&

Australia

AC

220V

~,

50

Hz

AC

240V

~,

50

Hz

240V

~

selec

table,

50/60

Hz

100

watts,

130

VA

Fitted

AC

line

fuse

holder

Not

fitted

A-GX1/A-GX1B

Input

Sensitivity/

Impedance

PHONO

:

2.5

mV/47

kohms

TUNER,

CD/VIDEO

SOUND,

TAPE

:

150

mV/40

kohms

Phono

Equalizer

Deviation

>

+1.0

dB

(40

Hz—

15

kHz)

Signa!

to

Noise

Ratio

|

PHONO

:

70

dB

(66

IHF)

TUNER,

CD/VIDEO

SOUND,

TAPE

~—

_:

96dB

(‘66

IHF)

PHONO

:

78

dB

('78

IHF,

Rec

Out)

TUNER,

CD/VIDEO

SOUND,

TAPE

:

72 dB

(‘78

IHF,

Speaker

Out)

:

+6

dB

at

100

Hz

+4

dB

at10

kHz

Loudness

Control

(Volume

Control

at

-30

dB

position)

Dimensions

and

Weight

(kg/lbs)

435

92

218

3.3

oa

Design

and

specifications

subject

to

change

without

no-

tice.

AC

110/120/220

Not

fitted

(No.

2810)

1-2

4-GX1/A-GX1B

2.

Removal

and

Reassembly

Procedures

2-(1)

Removal

of

the

Main

P.C.

Board

1.

Remove

the

metal

cover.

2.

Remove

screws

(1)

and

@

on

the

P.C.

board

3.

Remove

the

jack

on

the

rear

panel

and

fixing

screws

@)

~

()

of

the

speaker

terminal.

4,

Remove

screws

@)

~

©

and

plastic

rivet

©

to

set

the

front

panel

free.

5.

Remove

all

the

screws

@)

~

(5

except

the

foot

at

the

bottom.

Note:

As

three

types

of

fixing

screw

are

used

for

the

base,

make

sure

the

screws

are

correct

when

reinstalling.

1-3

(No.

2810)

6.

Slightly

pull

the

front

panel

forward

to

raise

the

P.C.

board

as

shown

in

the

figure.

Note:

This

portion

is

iocked

to

the

chassis

base.

PHONO

CD/VIDEO

SOUND

R357

TUNER

$304

TAPE

PLAY

TAPE

REC

MAIN

AMP

SPEAKER

TONE

CONTROL

BALANCE

VOLUME

A-GX1/A-GX1B

Care

should

be

taken

not

to

deform

the

part

of

the

heat

sink

indicated

by

\

|)

when

pulling

out

the

P.C.

board.

Oth-

erwise,

it

may

result

in

reduc-

ing

the

efficiency

of

heat

dis-

Sipcition.

LOUDNESS

Sw

(No.2810)

1-4

\-GX1/A-GX1B

4.

Wiring

Diagram

Fuse

Holder

AC

Outlets

PC.Board

Assy

|

b

Secondary

P.C.Board

Ass’y

aoe

059-

10

Power

Transtomer

ee

Voltage

Selector

Power

Transfomer

|

ENH-O59~-7

AC

Outlets

PC.Board

Ass'y

For

West

Hy

Germany

&

i

=

a

Europe

<a-——-

For

Other

ENH-0O59-6

Power

Switch

P.C.Board

Ass’y

For

C

Australia

p=

——

BLK

“WHT

For

Canada

J

=

For

U.S.A

i

For

U.K.

~~

For

U.K,

Australia,

Europe,

West

Ger

U.SA.,

&

Canada

|

ENH-059-5

Power

Transfomer

P.C.Boord

Ass'y

ee

a

eee

ee

a

ee

7

1-5

(No.

2810)

A-GX1/A-GX1B

(U)

FOR

OTHER

COUNTORIES

(P)(PG)

FOR

US

MILITARY

(BS)

FOR

UK

(A)

FOR

AUSTRALIA

(E)

FOR

EUROPE

(G)FOR

W.

GERMANY

(C)

FOR

CANADA

6)

Gace

SS

Se

ee

SELECTOR

TOO!

Af

SOO}

|

:

A

Tk6A

HOwsizov

‘“

TRANS

T8OOMA

220V/240V

CONECTION

SWITCHED

x

|

UNSWITCHED

x

2

AC

110V

jacouTLeTS)

SED

I

ACI2Z0V

AC220V

BLK

BLK/

WHT

AC

I1OV/120V/

220V/240V~

50Hz/60Hz

AC240V

TA7T3I7P

_USED

|

€303,304

|

oop

|

iooPp

|

470P

ee

UNF.

C.

C717,718

0022

U

CD/VIDEO

SOUND

lO

tt

12

13

10

11

12

a

YO!

20

IBK

pe04

182473)

L2.2]

+

RIGHT

SPEAKERS]

02

H-0590-2|

4

ENH-O59-2

|

POWER

|

D951

|

See

a

aereun

Maw

ya

|

R

esi

|

oc

015

R513

Sain

47K

|

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eatery

||

|

a

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|

2

FW

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gel)

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0-9-0

0

-W

By

O79

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C503

|

820

Fce)5

OLS.

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Eases

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0.082

|

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IS

LIS!

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ral

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loll)

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rey

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[ENH-059-5}

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=

au

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_[ENH-059=1]

Notes:

and

those

marked

with

A,

be

sure

to

use

the

designat-

1.

—————

_

indicates

positive

B

power

supply.

ed

parts

to

ensure

safety.

2,

SS

eS

indicates

negative

B

power

supply.

5.

This

is

the

standard

circuit

diagram.

ae

~

indicates

signal

path.

The

design

and

contents

are

subject

to

change

without

;

notice.

4.

When

replacing

the

parts

in

the

darkned

area

(

|

(No.

2810)

A-GX1/A-GX1B

FWIos

FWIO8

ENH-O59-2

Head

Phones

PC.Board

Ass'y

FWIOB

E

NH-

060

FWio3

FWi0S(7

pin)

FWIO2

ENH-059-|

Power

Supply

&

Main

Amp

P.C.Board

Ass'y

@peeseeeeO

Countries

Equaslizer

Amp

P.CcBoard

Ass'y

|

aha

lotale

FWIO5S(7pin)

ENH-O59-3

Tone

Control

P.C.Booard

ENH-059-2

Volume

&

Blance

P.C.Board

Ass'y

\-GX1/A-GX1B

VICTOR

COMPANY

OF

JAPAN,

LIMITED

STEREO

DIVISION.

YAMATO

PLANT,

1644,

SHIMOTSURUMA,

YAMATO-SHI,

KANAGAWA-KEN,

242,

JAPAN

(No.

2810)

oe

in

Japan

-G

A-GX1/A-GX1

I

PARTS

LIST

Contents

1:

Wait

Parts

LOGATIONS

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seaman

2-2

2.

Exploded

View

and

Part

NUMBERS

.............-.c:ccccsccccssssscessesseneconsssonsonersecesnesncusaensascosropevssed

peers

2-3

3.

Printed

Circuit

Board

Ass’y

and

Parts

List.................ccccccesseccseseosceeueecsseccsseeceeeceneeseaeeseaeeeoaees

2-6

3-(1)

ENH-059

CO

Main

Amp

P.C.

Board

ASS’Y

.............cccecceeseeeeeneeeeeeceeeeeenaaeeereeenenaaueeeeeesatanes

2-6

3-(2)

ENH-O60

0

Equalizer

Module

P.C.

Board

ASS’y

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

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ce

cee

enreeeeeteeceeseeneaeerrentaens

2-10

3-(3)

TPS-334

AC

Outlet

P.C.

Board

ASS'Y........c:.c.cccesccceeseseronesacssssnssnsccenscaceescetecusevecseanseeeens

2-10

4

Packing

Materials

and

Part

NUMDEIS

sicicksnscans

ria

caterscatenastvaincaab

soem

een

dis

dinieniag

ean

teellntereaseiess

2-11

BS

PRCCOSSOTIES

L156

Cress

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csi

tian

aches

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dutasseaaawien

au

scuaaGa

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ance

edee

eee

2-12

(No.

38810)

2-1

JVC A-GX1 Manuale utente

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