JVC DX-E78BK User manual

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1

Table of contents

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AX-E78BK

AX-E79TN

DX-E78BK/DX-E79TN

(Unit

No.

AX-E78BK/AX-E79TN)

Note

1.

This

manual

is

for

one

part

of

the

titled

model

consisting

of

the

plural

units

as

detailed.

Part

of

Model

[|

__Manuai

No.

|

AXETERKIAXETSIN

|

_AMpUFIER

[20423

|

FD.WETSBKMD-WETOTN|

CASSETTE

DECK

20826

PRE7BBKIFMETOTIN§

|

——SsTUNER

2.

AX-E78BK

or

AX-E79TN

is

needed

for

the

power

supply

when

servicing

the

unit

not

provided

with

the

power

(mains)

cord.

:

Contents

Safety

Precautions

......-.---++seerereeee

1-2

Schematic

Diagrams

....-.

Leese

sates

insertion

Instruction

Book

......---+-eeee

errr

eee

1-3

_—-

Printed

Circuit

Boards

.......-----++

Insertion

Description

of

ICs

......----

Cute

ieadaees

1-26

Block.

Diagram

.......--

ee

ahuRicard

ae

Insertion

Disassembly

Procedures

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

1-28

Parts

List

=

....--

Separate-volume

Insertion

No.

20423

June

1993

AX-E78BK

AX-E79TN

Safety

Precautions

.

The

design

of

this

product

contains

special

hardware

and

many

circuits

and

components

specially

for

safety

purposes.

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.

Services

should

be

performed

by

qualified

personnel

only.

).

Alterations

of.

the

design

or

circuitry

of

the

product

should

not

be

made.

Any

design

alterations

of

the

product

should

not

be

made.

Any

design

alterations

or

additions

will

void

the

manufacturer's

warranty

and

will

further

relieve

the

manufacture

of

responsibility

for

personal

injury

or

property

damage

resulting

therefrom.

.

Many

electrical

and

mechanical

parts

in

the

products

have

special

safety-related

characteristics.

These

characteristics

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

components

having

such

features

are

identified

by

shading

on

the

schematics

and

by

(

A\)

on

the

Parts

List

in

the

Service

Manual.

The

use

of

a

substitute

repalcement

which

does

not

have

the

same

safety

characteristics

as

the

recommended

replacement

parts

shown

in

the

Parts

List

of

Service

Manual

may

create

shock,

fire,

or

other

hazards.

.

The

leads

in

the

products

are

routed

and

dressed

with

ties,

clamps,

tubings,

barriers

and

the

like

to

be

separated

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

it

should

be

confirmed

that

they

have

been

returned

to

normal,

after

re-assembling.

.

Leakage

currnet

check

(Electrical

shock

hazard

testing)

-

After

re-assembling

the

product,

always

perform

an

isolation

check

on

the

exposed

metal

parts

of

the

product

(antenna

terminals,

knobs,

metal

cabinet,

screw

heads,

headphone

jack,

contorl

shafts,

etc.)

to

be

sure

the

product

is

safe

to

operate

without

danger

of

electrical

shock.

Do

not

use

a

line

isolation

transformer

during

this

check.

@

Plug

the

AC

line

cord

directly

into

the

AC

outlet.

Using

a

“Leakage

Current

Tester",

measure

the

leakage

current

from

each

exposed

metal

parts

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

0.5mA

AC

(r.m.s.).

.

e@

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

1,500Q

10

W

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

(Having

1000

with

the

AC

voltmeter.

ohms/volts,

Move

the

resistor

connection

to

each

exposed

or

more

sensitivity.)

metal

part,

particularly

any

exposed

metal

part

having

a

return

path

to

the

chassis,

and

meausre

the

AC

voltage

across

the

resistor.

Now,

reverse

the

plug

in

the

AC

outlet

and

repeat

each

measurement.

Any

voltage

measured

must

not

exceed

0.75

V

AC

(r.m.s.).

This

corresponds

to

0.5

mA

AC

(r.m.s.).

Place

this

probe

on

each

exposed

15002

10W

metal

part.

Good

earth

ground

Warning

1.

This

equipment

has

been

designed

and

manufactured

to

meet

international

safety

standards.

2.

It

is

the

legal

responsibility

of

the

repairer

to

ensure

that

these

safety

standards

are

maintained.

3.

Repairs

must

be

made

in

accordance

with

the

relevant

safety

standards.

4.

It

is

essential

that

safety

critical

components

are

replaced

by

approved

parts.

5.

If

mains

voltage

selector

is

provided,

check

setting

for

local

voltage.

1-2

(No.20423)

AX-E78BK

AX-E79TN

ve

suoneayyoads

.

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[enue

UONoNNsUT

sIyL,

(No.20423)

1-3

AX-E78BK

AX-E79TN

Getting

started

Check

to

be

sure

you

have

all

of

the

following

things,

which

are

supplied

with

the

system.

cs

i

NY,

AM(MW/LW)

Remote

Controller

Batteries

FM

Wire

Antenna

Antenna

-

:

(only

for

Germany)

If

any

are

missing,

contact

your

dealer

immediately.

How

to

Put

Batteries

in

the

Remote

Controller

FM

Feeder

Antenna

FM

Antenna

Adaptor

(except

for

Germany)

(except

for

Germany)

Match

the

polarity

(+

and

—)

on

the

batteries

with

the

+

and

—

markings

on

the

battery

compartment.

CAUTION:

Observe

Proper

Handling

of

Batteries.

To

avoid

battery

leakage

or

explosion:

¢

Remove

batteries

when

the

Remote

will

not

be

used

for

a

long

time.

When

you

need

to

replace

the

batteries,

replace

both

batteries

at

the

same

time with

new

ones.

e

¢

Don’t

use

an

old

battery

together

with

a

new

one.

*

Don’t

use

different

types

of

batteries

together.

Connecting

the

Speakers

Main

Speakers

Connect

to

SPEAKERS

A

For

each

speaker

connect

one

end

of

the

speaker

wire

to

the

speaker

terminals

on

the

back

of

the

amplifier

and

one

end

to

the

speaker.

On

the

back

panel:

1.

Open

each

terminal.

Insert

the

end

of

the

speaker

wire

as

shown

(be

sure

to

remove

the

insulation

at

the

end

of

each

wire

first).

2.

3.

Close

the

terminals

to

clamp

the

speaker

wires

firmly

in

place.

4.

Connect

the

red

(+)

and

black

(-)

terminals

of

the

right

side

speaker

to

the

red

(+)

and

black

(~)

terminals

marked

R

on

the

amplifier.

Connect

the

red

(+)

and

black

(—)

terminals

of

the

left

side

speaker

to

the

red

(+)

and

black

(—)

terminals

marked

L

on

the

amplifier.

Right

Left

speaker

speaker

Surround

Speakers

Connect

to

SPEAKERS

B

Left

ater

Right

.

surround

speaker

Important

Cautions

SPEAKERS

CONNECTION

switch

If

you

are

connecting

the

speakers

only

to

the

Main

Speakers

(SPEAKERS

A)

ierminals,

set

ithe

SPEAK-

ERS

CONNECTION

switch

to

the

BJ

ONLY

side.

-

EXoniy>

-A-E

tT

If

you

are

connecting

the

speakers

to

both

Main

Speakers

(SPEAKERS

A)

and

Surround

Speakers

(SPEAKERS

B)

terminals,

setthe

SPEAKERS

CON-

NECTION

switch

to

the

Jj

+

EJ

side.

Bion;

r-

IMPORTANT:

Use

speakers

with

the

correct

impedance.

The

correct

impedance

is

indicated

on

the

rear

panel.

3

1-4

(No.20423)

AX-E78BK

AX-E79TN

Connecting

the

System

Control

Cards

and

Connecting

Auxiliary

Equipment

Connect

the

components

exactly

as

illustration.

CAUTION:

First

make

all

connections

before

plugging

the

Unit

into

any

AC

power

outlet.

When

you

plug-in

the

system

connector,

make

sure

that

the

white

line

of

the

system

con-

necting

cords

is

seen

on

the

left.

Press

the

middie

of

the

connector

unit

until

it

clicks

into

the

male

con-

nector.

Pull

the

connector

out.

Never

puli

on

the

cords

themselves,

fy

Tuner/Timer

S.E.A.

Graphic

Equalizer

CD

Player

icm icm

There

are

three

ways

to

lay

out

the

system

as

shown

above:

Tuner/Timer

pas

The!

Tuner/Timer

Amplifier

S.E.A.

Graphic

Equalizer

CD

Player

Tape

Deck

¢

Leave

a

space

of

at

least

1

cm

on

both

sides

of

the

amplifier

and

keep

the

back

at

least

10

cm

from

the

wall

for

ventilation.

¢

If

the

system

does

not

work

will

or

needs

repairing,

please

take

all

the

components

with

you

to

the

nearest

agent.

(No.20423)

1-5

AX-E78BK

AX-E79TN

Connecting

the

FM

and

AM

Antennas

FM

Antenna

Connections

Outside

FM

Antenna

Wire

AM

Loop

antenna

J

1-6

(No.20423)

AM

Antenna

Wire

Note:

Even

when

connecting

an

outside

AM

antenna,

keep

the

indoor

AM

loop

connected.

A.

For

Germany

©

Using

the

supplied

Wire

Antenna

The

FM

wire

antenna

provided

can

be

connected

to

a

FM

75-ohm

COAXIAL

as

a

temporary

measure.

@

Using

the

Coaxial

Type

Connector

(Not

Supplied)

A75-ohm

antenna

with

coaxial

type

connector

(DIN

45

332)

should

be

connected

to

the

FM

75-ohm

COAXIAL

terminal.

B.

For

Other

Countries

B-1.

Using

the

Supplied

Feeder

Antenna

®

Attach

the

feeder

antenna

to

the

FM

connector

as

Shown

in

the

figure.

@

Connect

the

FM

connector

to

the

FM

75-ohm

COAXIAL

terminal.

B-2.

Using

FM

75-ohm

antenna

Cable

(Not

Supplied)

©

Open

the

claws

at

both

sides

and

remove

the

cover.

@

Move

the

conductor

wire

from

to

®

using

tweezers

or

a

similar

instrument

(only

when

using

coaxial

cable).

®

Fix

the

coaxial

cable

and

its

core.

®

Put

on

the

cover.

®

Connect

the

FM

connector

on

the

FM

75-ohm

COAXIAL

terminal.

Note:

Make

sure

the

antenna

conductors

do

not

touch

any

otherterminals,

connecting

cards

and

power

card

in

the

system,

This

could

cause

poor

reception.

For

Germany

Extend

the

supplied

wire

antenna

horizontally.

For

Other

Countries

—

=

Unfold

the

loops

of

the

supplied

dipole

FM

feeder

antenna

and

extend

them

as

shown.

Fasten

them

up

in

the

position

which

gives

you

the

best

FM

reception.

Before

attaching

a

75

ohm

coaxial

lead

(the

kind

of

round

wire

going

to

an

outside

antenna),

disconnect

the

supplied

dipole

indoor

antenna.

If

reception

is

poor,

connect

the

outside

antenna.

How

to

Strip

the

75-ohm

Coaxial

Cable

1.

Strip

back

the

outside

covering

of

the

75

ohm

coaxial

cable

to

expose

the

braided

metallic

mesh.

2.

Pull

the

mesh

back

and

twist

into

a

single

connector

as

shown.

3.

Strip

the

insulation

about

10

mm

back

from

the

central

wire.

4.

Attach

to

the

supplied

Antenna

Adaptor,

as

shown

in

the

diagram

above.

if

receptions

is

poor,

connect

the

outside

antenna.

Snap

the

tabs

on

the

loop

into

the

sluts

of

the

base

to

Tum

the

loop

until

you

:

3

assemble

the

AM

loop.

have

the

best

reception

Using

the

Amplifier

SD

stancer

POWER

ON:STANOBY

Caution:

Too

LOUD!

ACTIVE

BASS

EXTENSION

AX-E78BK

AX-E79TN

ie

the

Power

Switch

Press

the

POWER

switch

to

turn

on

the

stereo

system.

When

the

POWER

switch

is

not

pressed

and

the

power

cord

is

plugged

in,

the'stereo

isin

STANDBY

mode

and

STANDBY

indicator

lights.

In

STANDBY

mode,

the

stereo

uses

a

small

amount

of

power

(15.5

watts)

for

the

clock,

memory

contents,

and

any

timers

which

are

set.

2.

To

disconnect

power

completely,

unplug

the

power

cord.

Adjusting

the

Volume

controls

Volume

Control

Turn

the

VOLUME

knob

to

adjust

the

volume

level

of

the

speakers

or

headphones.

CAUTION:

Always

set

the

VOLUME

control

to

0

before

turning

on

a

connected

source

such

as

a

VCR

or

Record

Player,

or

starting

any

other

of

the

sound

sources

such

as

the

radio,

tape,

or

CD

player.

Otherwise,

if

the

VOLUME

control

is

turned

up

the

sudden

blast

of

sound

energy

can

permanently

damage

your

hearing

and/or

ruin

your

speakers.

Balance

Control

Tur

the

BALANCE

knob

to

adjust

the

left-and-right

sound

balance

in

the

speakers

or

headphones.

Bass

Control

.

Turn

the

BASS

knob

to

adjust

the

bass

sound

quality.

Treble

Control

Tum

the

TREBLE

knob

to

adjust

the

treble

sound

quality.

Active

Bass

Extension

This

feature

is

designed

and

incorporated

to

reinforce

the

bass

sound,

depending

on

the

volume

level

to

maintain

the

richness

and

fullness

of

the

bass.

You

cannot

control

it

manually.

Press

the

ACTIVE

BASS

EXTENSION

button

to

light

the

indicator

if

you

want

to

use

the

Active

Bass

Extension

function.

To

cancel

this

function,

press

the

ACTIVE

BASS

EXTENSION

button

again.

The

indicator

will

go

off.

Listening

with

Headphones

A

standard

pair

of

headphones

can

be

connected

at

the

PHONES

jack

on

the

front

panel.

No

sound

can

be

heard

from

the

speakers.

Be

sure

to

turn

down

the

volume

before

connecting

or

putting

on

headphones,

as

high

volume

can

damage

both

the

headphones

and

your

hearing.

(No.20423)

1-7

AX-E78BK

AX-E79TN

REMOTE

SENSOR

7

1-8

(No.20423)

Selecting

the

Source

Press

the

Source

Selector

button

to

select

the

Source

you

want

to

listen

to.

The

indicator

for

the

selected

source

will

light

up.

TAPE

Press

to

play

a

tape

O

If

tapes

are

already

in

the

Tape

Deck,

the

tape

in

deck

B

will

be

automatically

played.

PHONO

Press

to

play

a

record.

TUNER

Press

to

listen

to

a

radio.

cD

Press

to

play

a

CD.

Q

IfaCD

is

already

in

the

CD

tray,

it

will

be

automatically

played

back.

VCR/DAT

Press

to

play

the

sound

from

sources

connected

to

the

VCR/DAT

terminals

on

the

rear

panel.

See

page

4

for

connections

of

record

player,

VCR,

DAT,

etc.

Q

Please

make

sure

to

turn

on

the

power

of

the

record

player,

VCR,

DAT,

etc.,

when

you

want

to

play

back

the

sound

from

them.

Gi)

We

reccomend

that

you

carefully

read

the

instruction

manual

for

the

record

player,

VCR,

DAT,

etc.,

so

that

they

are

operated

correctly.

Remote

Sensor

Receives

the

signal

for

the

supplied

Remote

Controller.

Surround

You

can

enjoy

the

Surround

effect

during

playback

when

the

speakers

are

connected

to

both

the

SPEAKERS

A

(Main

Speakers)

and

the

SPEAKERS

B

(Surround

Speakers)

terminals

on

the

rear

panel

of

the

amplifier.

2

In

this

case,

please

set

the

SPEAKERS

CONNECTION

switch

to

the

A+B

side.

Using

the

S.E.A.

Graphic

Equalizer

SOUND

EFFECT

DEMONSTRATION

DEMO

SEA

FLAT

AX-E78BK

AX-E79TN

S.E.A.

(Sound

Effect

Amplifier)

is

a

function

which

divides

playback

sound

into

7

frequency

ranges;

63Hz,

160Hz,

400Hz,

1

kHz,

2.5kHz,

6.3kHz

and

16kHz;

it

then

adjusts

the

sound

quality

by

increasing

and

decreasing

the

level

of

each

frequency

range.

The

S.E.A.

Graphic

Equalizer

of

this

unit

has

Programmed

S.E.A.

mode

and

Manual

S.E.A.

mode.

The

Programmed

S.E.A.

mode

has

6

patterns

-

POPS, JAZZ,

ROCK,

MOVIE,

CLASSIC

and

CAR.

With

the

Manual

S.E.A.

mode,

you

can

create

up

to

6

patterns

of

your

preference,

which

can

then

be

stored

in

the

memory

labelled

as

A

to

F.

POPS

Good

for

vocal

music,

JAZZ

Gives

a

feeling

of

a

live

atomosphere.

Good

for

acoustic

music.

ROCK

Boosted

low

and

high

frequencies.

MOVIE

Adds

breadth

to

the

sound

so

you

feel

like

you’re

in

a

movie

theater.

CLASSIC

Set

for

wide

and

dynamic

sound

stereo’systems.

CAR

When

creating

tapcs

for

usc.in

a.car

stcrco.

DEMO

This

will

automatically

play

back

all

6

patterns

of

the

Programmed

S.E.A.

mode,

each

lasting

for

a

few

seconds.

At

the

same

time,

each

frequency

curve

will

be

shown

on

the

Display.

DEMO

playback

will

be

repeated

in

the

following

order:

cr

POPS

>

JAZZ~

ROCK

MOVIE

CLASSIC

>

CAR

=]

Press

the

DEMO

button

while

playing

back

a

CD,

a

tape,

etc.

Q

The

indicator

for

the

SEA

ON/OFF

button

will

light

up,

turning

on

the

S.E.A.

function

automatically.

“DEMO”

will

blink

on

the

Display

and

the

DEMO

playback

will

start.

To

cancel

the

DEMO

playback,

press

the

DEMO

button

again.

Q

“DEMO”

on

the

Display

and

the

indicator

for

the

SEA

ON/OFF

button

will

both

go

off,

and

the

S.E.A.

function

will

be

automatically

cancelled.

vane

a

Programmed

S.E.A.

pattern

Press

the

SEA

ON/OFF

button

to

turn

on

the

S.E.A.

function.

The

indicator

will

light

up.

Make

sure

that

you

see

“PROGRAMMED”

on

the

Display.

If

you

see

“MANUAL”,

press

the

PROGRAMMED

button

of

SEA

PRESET

to

change

to

the

Programmed

S.E.A.

mode.

“PROGRAMMED”

will

now

come

on

the

Display.

2.

Selecta

S.E.A.

pattern

by

pressing

either

the

A

or

v

button

of

SEA

PRESET.

eA

+

POPS/A

«+

JAZZ/B

«>

ROCKIC

«+

MOVIE/D

<>

CLASSIC/E

+

CAR/F

<>

v~-

Creating

your

own

patterns

using

the

Manual

S.E.A.

mode

1,

Press

the

SEA

ON/OFF

button

to

turn

on

the

S.E.A.

function.

The

indicator

will

light

up.

2.

Press

the

FLAT

button.

“MANUAL”

will

be

shown

on

the

Dispaly

and

a

flat

line

indicating

the

“0”

frequency

level

will

be

seen.

3.

Press

one

of

the

buttons

of

SEA

CONTROL.

The

range

you

have

selected

from

between

63Hz

(low)

to

16kHz

(high)

will

start

blinking.

If

you

press

the

SEA

CONTROL

button

without

first

pressing

the

FLAT

button,

the

range

for

the

pattern

which

is

currently

being

called

up

will

start

blinking

and

the

MANUAL

S.E.A.

mode

will

be

automatically

set.

(No.20423)

1-9

AX-E78BK

AX-E79TN

como.

Co)

BG

SURROUND

9

1-10

(No.20423)

vane

the

SEA

CONTROL

button,

you

can

now

create

your

own

frequency

patterns.

:

To

increase

the

level

of

the

frequency

range

which

is

blinking.

:

To

decrease

the

level

of

the

frequency

range

which

is

blinking.

,

CD

:

To

select

a

frequency

range.

a

Evey

time

you

pressthe

(<_)

or

(CS_)

button,

the

frequency

range

will

change

in

the

following

order.

=

+

63Hz

+

160Hz

«+

400Hz

<

1kHz

«>

2.5kHz

©

6.3kHz

<>

16kHz

«>

Storing

frequency

patterns

you

have

created

with

POPS/A

~

CAR/F.

Press

the

MEMORY

button.

“MEMORY”

will

light

up

on

the

Display

and

the

frequency

pattern

by

you

will

blink

fora

few

seconds.

(If

the

pattern

stops

blinking

and

lights

up

instead,

press

the

MEMORY

button

again.)

While

the

frequency

pattern

is

blinking,

press

the

~

or

v

SEA

PRESET

button

to

select

from

POPS/

A

~

CAR/F

to

store

it

with.

Press

the

MEMORY

button

again

to

memorize.

Calling

up

a

pattern

you

have

created

using

the

Manual

S.E.A.

mode

1,

2.

3.

Press

the

SEA

ON/OFF

button

to

turn

on

the

S.E.A.

function.

The

indicator

will

light

up.

Press

the

MANUAL

button

of

the

SEA

PRESET

button

to

select

the

Manual

S.E.A.

mode.

“MANUAL”

will

light

up

on

the

Display.

Call

up

the

pattern

by

selecting

from

POPS/A

~

CAR/F

using

the

SEA

PRESET

«

or

v

button.

Changing

the

S.E.A.

Display

The

Display

mode

has

2

types

—

PEAKHOLD

and

EQUALIZING

PATTERN.

Pressing

the

DISPLAY

button

will

alternate

the

type.

PEAK

HOLD

PROGRAMMED

3

UUM

g

2

2

=

=

=

5

ee

2s

=

2

Ss

=

sk

8

=

=

=

z

3k

=

= =

=

=

=

=

=

=

s

=

s

=

ik

2.

8

EQUALIZING

PATTERN

PROGRAMMED

»

POPS/A

JAZZ/B

ROCKIC

MOVIE/D

CLASSIC/E

CARIF

Surround

button

You

can

get

even

more

profound

Surround

effect

by

pressing

this

button

when

the

speakers

are

connected

to

both

SPEAKERS

A

and

B

terminals

on

the

amplifier

rear

panel.