Jvc Dr-e34bk User manual

DR-E34BK

DR-E34LBK

JVC

SERVICE

MANUAL

STEREO

DOUBLE

CASSETTE

DECK

RECEIVER

DR-E34BK

MODEL

No. DR-E34LBK

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Contents

Page

Safety

Precautions

.......

.

..........

....

.

..

.

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

1- 2

Instruction

Book

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

..

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

1- 3

Disassembly

Procedures

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

..

................... 1-16

Explanation

of

System

Control

IC

....

.

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

1-17

Description

of

Major

I

Cs

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

1-

18

Explanation

of

Other

I

Cs

.....

.

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

1-23

Internal

Connections

of

the

FL

Display

Tube

...

..

....

1-25

Adjustment

Procedures

(Cassette

Deck)

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

1-

26

Page

Adjustment

Procedures

(Tuner

)

.....

..

.....

.

.....

..

.......

1-29

Connection

Diagrams

.........

.

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

...

....

.

......

.... 1

-30

Schematic

Diagrams

....

.

......

...

..

.

..........

.

...

.. In

sertio

n

Printed

Circuit

Boards

.....

..

......

.

......

..

....

.

..

.

....

.

Insert

i

on

Block

Diagrams

..

...

.

..

.

......

.

...........

..

......

...

.....

.

In

s

ertion

Parts

List

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

.

....

.

........

..

Separate-vo

l

ume

Insertion

No.

20162

Mar

.

1990

www.audiodna.sk

DR-E34BK

DR-E34LBK

-Safety

Precautions

------

---

------,

1.

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

th

e original design unless

authorized

in

writing

by

the

manufacturer.

Replacement

parts

must

be

identical

to

those

used

in

the

original ci

rcuits.

Service

should

be p

er·

formed

by

qualified

personnel

only.

2.

Alterations

of

the

design

or

circuitry

of

the

product

should

not

be

made.

Any

des

i

gn

alterations

of

the

product

should

not

be

made.

Any

design

alterations

or

additions

will

void

t

he

manufacturer

's

warranty

and

will

furt

h

er

relieve

the

manufacturer

of

responsibility

for

personal

injury

or

property

damage

re

sulting

t h

erefrom.

3.

Many

electrical

and

mechanical

parts

in

the

product

have

special

safety-related

character

istics.

These

characte

ri

stics

are

often

not

evident

from

visual

inspection

nor

can

the

protect

i

on

affo

r

ded

by

them

necessarily

be

obtained

by

using

replacement

components

rated

for

higher

voltage,

wattage,

etc.

Replacement

parts

which

have

these

spec

ia

l

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

( 5 )

on

the

Parts

Li

st

in t

he

Service

Manual.

The

use

of

a

sub-

stitute

replacement

which

does

not

have

the

same

safety

characteristics

as

the

recommended

replacement

part

shown

in

the

Parts

List

of

Service Manual

may

create

shock,

fire,

or

othe

r

ha

zards.

4.

The

leads in

the

products

are

routed

and

dressed

with

ties, cl

amps

,

tub

ings,

barriers

and

the

l

ike

to

be

sepa

rated

from

live

parts,

high

temperature

parts,

mo

ving

parts

and/or

sharp

edges

for

the

prevent

ion

of

electr

ic

shock

and

fire

hazard.

When

service

is

required

, t he original lead

rout

ing

and

dress

should

be

observed,

and

it

should

be

confirmed

that

they

have

been

return

ed

to

norma

l,

after

re-ass

embling

.

5.

Leakage

current

check

(

Elect

rica

l

shock

hazard

test

ing)

After

re-assembling

the

product

.

always

perform

an

isolation

check

on

the

exposed

metal

parts

of

the

product

(antenna

terminals

,

kno

bs.

metal

cabinet.

screw

heads,

headphone

jack,

con

trol

shafts,

etc.)

to

be

su

re

the

product

is

safe

to

operate

without

danger

of

electrical

shock.

Do

not

use

a li

ne

iso

lation

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

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

exce

ed

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

,0

00

ohms

per

v

olt

or

more

sensi-

tivity

in

the

following

manner.

Connect

a

1,500.Q

10W

r

esistor

paralleled

by

a 0 .

15µF

AC-type

capac

itor

be

-

tween

an

exposed

metal

part

and

a

known

good

earth

g

round.

Measure

the

AC

voltage

across

the

resistor

with

the

AC

voltmeter.

EE3

AC

VOL

TMETEA

(Hav

i

ng

1000

ohms

/

volt.

or

more

sensitivity.)

t)

0--

-

..

Move

the

resistor

connection

to

each

exposed

meta

1

part,

particularly

any

exposed

metal

part

having a

return

path

to

the

chassis,

and

measure

the

AC

volt-

age across

th

e

resistor

.

Now

, reverse

the

plug in

the

AC

outlet

and

repe

at

each

measurement

.

An

y

vo

ltage

measu

re

d

must

not

exceed

0 .

75

V AC

(r.m.s.).

This

corresponds

to

0.5 rnA

AC

(r

.

m.s

.).

i Place

this

prnbe

__

_.__...__

_,,""'

_ _

___._--<

•• on each exposed

15000

,o w

metal

pan.

~

Good

eanh

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

m

ainta

in

ed.

3.

Repairs

must

be

made

in

accordance

with

the

relevant

safety

standards.

4.

It is essential

that

safety

critical

compo

nents

are

replaced

by

approved

parts

.

5.

If

mains

voltage

selector

is

provided.

check

setting

for

local voltage.

1-2 (No.

20162)

www.audiodna.sk

Schematic Diagram

■

Tuner Section

(1

l

Notes:

1

i==J

2.

3.

4.

FOR

[

..,

.,.,

""

Shows

DC

vo

ltage

to

the

chassis

with

no

signal

input

.

indicates

+8 p

owe

r

supp

ly.

indicates

- 8

power

supply.

i

ndicates

signal

path.

5.

When

replacing

the

parts

in

the

darkned

are ( - ) and

those

marked

with

~

, be sure

to

use

the

.designated

parts

to

ensure

safety.

6.

This

is

the

standard

circuit

diagram.

·

The

design

and

contents

are

subject

to

change

without

notice.

DR-E34BK

DR-E34LBK

(No

20162)

www.audiodna.sk

DR

-

E34

BK

DR-E34LBK DR-E34BK

DR-E34LBK

■

Tuner

Section

(2)

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Notes:

1.

Shows

DC

vo

lt

age

to

the

c

has

sis

with

no

signal i

nput.

rndicates

+B

powe

r

supply.

5.

When

replacin

g

the

parts

in

the

dark

ned

are

I - ) a

nd

those

marked

wit

h

.&.

, be sure

to

use

the

designated

parts

to ensure

safety.

2.

3. i

ndi

cates

- B

power

suppl

y.

6.

This

is

the

standa

rd c

ir

c

uit

d

iagram.

4 .

indica

t

es

sig

nal

path.

The

design

and

conten

ts are

sub

j

ect

to

change

wit

h

out

not

ice.

(No.

20162)

(No

20162

)

www.audiodna.sk

■

Cassette

&

Power

Amplifier

Section

r----------------------------------------------------------------------------------

Notes:

1.

2.

--

3.

---

4.

lm

ai

1 -

1 1

$

Shows

DC

vo

ltag

e

to

the

chassis

with

no

signa

l

input.

indicates

+8

power

supply.

indica

tes

- B

power

supply.

indicates

signal

path.

I

__

_

__

.

____

_.

---

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replac

i

ng

the

pa

rts

in

th

e

darkned

are

( - l

and

those

marked wi

th

Lt.

, be sure

to

use

the

designated

parts

to

ensure

safety

.

6.

This

is

the

standard

ci

rcuit

diagram

.

The

de

sign

and

contents

are

subject

to cha

nge

without

notice

.

DR-E

34BK

DR-

E34

LBK

(

No

.

201

62

)

www.audiodna.sk

SEA

&

System

Control

Section

DR-

E348K

DR-E3

4LBK

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DR-E34LBK

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Notes:

1.

2.

3.

4.

Shows

DC

voltage

to

the

chassis

with

no

signal i

np

u

t.

ind

ic

ates

+B

power

supply

.

indicates

- B

power

supply

.

indicates

signal

path.

5.

Wh

en

replacing

the

par

ts

in

the

darkned

are I - l a

nd

those

marked wi

th&.

, be sure

to

use

the

designated

parts

to

ensure

safety.

6.

T

his

is

the

sta

ndard c

ir

c

uit

diagram

.

The

design

and

con

te

n

ts

are

subject

to

change

without

notice

.

(No.

20162

)

!No

.

20162

)

www.audiodna.sk

Printed Circuit Boards

■

Tuner

PC Board (ENA-

094

)

A-

099

)

OR-E34BK

DR-

E34

L

BK

(No.

20162

)

www.audiodna.sk

■

Cassette

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and

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Primary PC Board (ENB-

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DR-E34BK

DR-E34LBK

(No

2016

2)

DR-E34BK

DR-E34LBK

(

No

.

2016

2)

0

I '

www.audiodna.sk

■

System Control and

FL

Display PC Board

(ENC-073)

DR-E34BK

DR-E34LBK

(No.

20162)

www.audiodna.sk

[

■

Cassette and

AMP

PC Board (

ENJ-036)

DR-E3

4B

K

DR-

E34

LBK

(No.

20162)

DR-E34BK

DR-E34LBK

(No.

20

1

62)

www.audiodna.sk

JVC DR-E34BK User manual

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