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JVC

SERVICE

MANUAL

|

move.

SEA-E3OB

Contents

Safety

Precautions

........000

000

cee

1-1

1.

Specifications

........

ind

ramets

oneutcnie

:

pare

C2

2.

Service

Precautions

2-(1)

Prior

to

Servicing

Take

Special

Care

about

the

Following

Matters............200022.

13

2-(2)

Relation

between

Switch

Operation

anal

QUtpUt

ese

eee

wee

1-3

2-(3)

Parts

Replacement

.....

ee

Se

Pata

ie

alee

Lee

3.

Disassembly

3-(1)

Removal

of

the

Top

Cover

......

:

3-(2)

Removal

of

the

Front

Panel

.....

3-(3)

Removal

of

the

Analog

Switch

P.C.

B.

3-(4)

Removal

of

the

Power

Supply

P.C.B.

4.

Block

Diagram

.......

Sialet

dimes

:

5.

SEA-E30B

Schematic

Biscay.

RE

te

Ode

Parts

List

oc.

5

sees

ees

This

manual

combines

two

single

volumes;

Service

manual

and

Parts

list.

.

Separate-volume

Insertion

SEA-E30B

No.

2786

Dec.

1984

A-E30B

Safety

Precautions

1,

The

design

of

‘this

product

contains

special

hardware,

5.

Leakage

current

check

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

additions

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

charac-

teristics

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

Service

manual.

The

use

of

a

substitute

replacement

which

does

not

have

the

same

safety

characteristics

as

the

recom-

mended

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

separated

from

live

parts,

high

temperature

parts,

mov-

ing

parts

and/or

sharp edges

for

the

prevention

o

electric

shock

and

fire

hazard.

When

service

is

required,

the

original

lead

routing

and

dress

should

be

observed,

and

they

should

be

confirmed

to

be

returned

to

normal,

after

re-assembling.

Continental

Europe.)

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

Lioy

20V

Proper

setting

before

operating

this

equipment.

The

voltage

selector

switch

is

located

on

the

yay

240V

=

rear

panel,

sae

VOLTS

CAUTION:

Before

selecting

the

“Voltage

selector

switch”

to

proper

voltage,

disconnect

the

ae

power

plug.

1-1

(No,

2786)

CHECKING

YOUR

LINE

VOLTAGE

(Except

for

U.S.A.,

Canada,

Australia,

U.K.

and

(Safety

for

electrical

shock

hazard)

After

re-assembling

the

product,

always

perform

an

isolation

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

product

is

safe

to

operate

without

danger

of

electrical

shock.

Do

not

use

a

line

isolation

transformer

during

this

check.

@

Plug

the

AC

fine

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

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.

Con-

nect

a

1500

{2

10

W

resistor

paralleled

by

a

0.15

pF

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

meta!

Part,

particularly

any

exposed

metal

part

having

a

return

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

0.75

V

AC

(r.m.s.).

This

corresponds

to

0.5

mA

AC

(r.m.s.).

AC

VOLTMETER

(Having

1000

ohms/volt,

or

more

sensitivity.

)

Place

this

probe

15000

10W

“on

each

exposed

metal

part.

Good

Earth

Ground

SEA-E30B

1.

Specifications

Input

section

SEA

input

:

Input

impedance

47

kohms

Tape

input

:

Input

impedance

47

kohms

Output

section

SEA

output

:

Output

impedance

300

ohms

Tape

REC

:

Output

impedance

300

ohms

(during

SEA

recording)

Rated

output

:

1

V

RMS

(with

SEA

system

flat)

Maximum

output

:

4.5

V

RMS

(with

SEA

system

flat,

0.5

%)

Total

harmonic

distortion

:

0.1

%

(20

Hz

—

20

kHz,

rated

output)

Gain

:

0

dB

with

SEA

button

ON

(SEA

system

flat)

Frequency

response

:

10

Hz

—

50

kHz

(+0,

-2

dB)

S/N

ratio

:

110

dB

(at

rated

output,

IHF

A-network

short-circuited)

Control

section

SEA

center

frequencies

:

31.5

Hz,

63

Hz,

125

Hz,

250

Hz,

500

Hz,

1

kHz,

2

kHz,

4

kHz,

8

kHz,

16

kHz

SEA

control

range

>

£10

dB

General

Power

source

:

See

attached

table

Dimensions

:

59(H)

x

340(W)

x

265(D)

mm

(2-5/16”

x

13-3/8"

x

10-7/16"')

Weight

:

1.7

kg

(3.7

Ibs)

Accessory

:

2

pairs

of

one-touch

signal

cords

(11

cm)

Note:

IHF:

Initials

of

the

Institute

of

High

Fidelity

in

the

U.S.A.

Design

and

specifications

subject

to

change

without

notice.

POWER

SPECIFICATIONS

ba

—

-

Areas

|

Power

Supply

Power

Consumption

Power

Outlet

Buss

ne)

j

QMF51U2-R20

U.S.A.

&

Canada

AC

120

V©,

60

Hz

6

watts

Fitted

(0.2

A

—

250

V)

zl

|

:

QMF51A2-R20S

Europe

AC

220

V~,

50

Hz

8

watts

Not

Fitted

(T

200

mA)

:

QMF51E2-R20SBS

ULK.

AC

240

V~,

50

Hz

8

watts

Not

Fitted

(T

200

mA)

be

|

. :

QMF51

A2-R20S

Australia

AC

240

Vv,

50

Hz

8

watts

Not

Fitted

(T

200

mA)

AC

110

V—120

V

U.S.

Military

Market

&

one

V

—

240

Vv

f

8

watts

Not

Fitted

QMF51A2-R20S

Other

Areas

selectable,

50/60

Hz

(T

200

mA)

|

(No.

2786)

1-2

A-E30B

2.

Service

Precautions

2-(1)

Prior

to

Servicing

Take

Special

Care

about

the

Following

Matters

1.

Parts

marked

with

A\

symbol

on

the

circuit

diagram

and

parts

list

are

important

for

safety.

When

replacing

those

parts,

be

sure

to

use

the

specified

parts

numbers.

2.

Confirm

that

all

metallic

clamps

are

covered

with

vinyl

tubes,

3.

Confirm

the

thickness

of

newly

replaced

wire’s

insulat-

ing

film

(0.3

mm

and

more).

4.

When

the

power

cord

is

replaced,

the

new

one

does

not

come

out

if

it

is

pulled

in

all

different

directions.

2-(2)

Relation

between

Switch

Operation

and

Output

TAPE

MONITOR

TAPE

REC

TERMINAL

‘OUT’

5.

Parts

relating

to

the

power

source

and

wires

have

been

bound

up

and

soldered.

6.

After

completion

of

soldering

parts

between

terminals

of

the

AC

power

fine,

confirm

that

there

remains

space

and

distance

more

than

3mm

between

neighboring

parts.

Pay

special

attention

to

solder’s

quantity,

bend

and

burr

of

wire.

LINE

OUT

TERMINAL

‘OUT’

LINE

IN

signal

LINE

IN

signal

SEA

et

ben

Moin

cles

ed

Operative

SEA

ON/OFF

.......

Operative

LINE

IN

signal

TAPE

playback

SB

Aree

el

ol

gee

6

Operative

SEA

ON/OFF

......

Inoperative

2-(3)

Parts

Replacement

1.

This

model

is

composed

of

the

parts

shown

in

the

dia-

gram

of

details

on

page

1-4,

“Disassembly”.

As

all

board

assemblies

are

fixed

to

the

chassis

with

screws,

refer

to

the

section

of

“Disassembly’’

when

disassemble

and

re-assemble

this

set.

2.

LEDs

built

in

SEA

volume

control

levers

can

be

removed

as

shown

in

the

figure

below.

If

one

of

LEDs

(for

a

block

of

right

or

left)

is

set

with

reverse

polarity

or

in

open

circuit,

all

LEDs

do

not

light,

As

adjoining

LEDs

are

set

with

reverse

polarity

alternate-

ly,

take

special

care

about

it

when

replacing

LEDs.

When

placing

an

order

for

a

single

LED,

specify

the

parts

number

of

AA3422K.

1-3

(No.

2786)

[How

to

distinguish

a

defective

LED

from

normal

ones|

aa

\

=e

Pull

an

LED

slightly

forward

1—2

mm,

and

make

a

short-

circuit

at

its

both

lead

wires.

if

other

4

LEDs

light

in

this

state,

the

LED

is

defective.

Operation

lever

Cathode

ey

(shorter

lead)

SEA

knob

Anode

(longer

lead)

SEA

volume

|

SEA-E30B

3.

Disassembly

3-(1)

Removal

of

the

Top

Cover

3-(3)

Removal

of

the

Analog

Switch

P.C.B.

1.

Remove

four

screws

@

on

both

sides.

1.

Remove

two

screws

@

fixing

the

pin

jacks

from

the

rear

2.

Remove

two

screws

@

of

the

rear

panel.

panel.

3.

Lift

up

the

rear

side

and

pull

out

the

top

cover

from

the

front

panel.

3-(4)

Removal

of

the

Power

Supply

P.C.B.

1.

Remove

two

screws

@

fixing

the

P.C.B.

3-(2)

Removal

of

the

Front

Panel

2.

Pull

out

the

push

shaft

from

the

power

switch.

1.

Pull

out

ten

SEA

slide

knobs.

2.

Remove

three

screws

@

fixing

the

front

panel

from

the

bottom.

3.

Pull

out

two

plastic

rivets

@

fixing

the

equalizer

P.C.B.

4.

Remove

the

P.C.B.

from

the

click

points

(eight

at

the

top

and

bottom)

fixing

it

to

the

front

panel.

Top

cover

Equalizer

P.C.B.

Front

panel

Push

shaft

a

Bx,

-

ye

Se

een

a

“Pe

ee

SEA

slide

knob

(No.

2786)

1-4

4-E30B

4.

Block

Diagram

!

1C202

NO

MN4O16B

+

|

|

|

oa

re

!

5-element

“elemen

|

LINE

|

aay

equalizer

IC

equalizer

IC

i

OUT

(©)

|

VR301

|

SEA

|

RECO}

VR

~

310

TAPE

|

1¢201

SQ

TAPE_MONI

SEA

I

PLAY

(O

7

O—anaoten

SYS)

St!

—2

@

+

{0311

|

|

<>

cS

|

$302

$301

;

|

|

Indicator

1

|

ewer

ee

ee

ee

ee ee

ee

ee

ee

ee

ee

oe

oe

Om

ee

we

ee

ee

ow

ow

oo

—_

—_—

re

ee ee

ee

wen

ee

wee

reer

ore

eee

ee

ee

aes

|

IR-CH

r

|

Same

as

the

block

diagram

for

the

L-ch

I

|

Ua

Sry

ne

eee

te

he

ce

aig

LA3600

Voo

GND

Vcc

OUT

MN4016B

wer

rr

er

rrr

5

we

ee

ee

ee

Ee

L0)--@)--@---@-

BASE]

NF1

BASE2

NF2

BASE3

NF3

BASE4

NFS

1-5

(No.

2786)

SEA-E30B

5.

SEA-E30B

Schematic

Diagram

cE

|

Lanta

2

(28

e201

|

R2II

i

1c202

2505644

(Q,R)

|

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MN4OI68

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100K!470K

:

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pee

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Rse83

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|

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|

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1$2076-

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|

[iekHe

|

05

{

|

0:

ve

SEES

at

2

z

i

|

i

[Sezem

(Power

sw]

fo

|

pe

oo

ELoiite

DH

ps

an

|

(

|

rea

ZV

|

|

ou

U

J

|

|

|

|

|

|

|

|

|

|

i

|

yogeaaM)

per

|

i

|

|

|

Ll

|

|

|

|

Cane

|

PUSH

ON

|

|

|

|

|

|

|

|

|

|

|

|

a]

|

Best

|

g

38

|

PRIMARY

FUSE

BLOCK

SHOULD

BE

CHANGED

|

Sf)

|

82-1

|

|

HOV

=

Ov

—

24

(D)

FOR

JAPAN

AC

{00V,

50/60

Hz

ee

EACH

DESTINATION

AS

SHOWN

IN

LEFT

AC

120V~

60Hz

AC

120V~

6OHz

«fac

220V

~~

,50Hz

>

eX)

|

e

|

.

3/8

{&

i

POWER

TRANS

POWER

TRANS

ETPIOO0-29L

4

le

a

ETE

GCQ

29

JA

BLK

/

WHITE

(uy)

FOR

OTHER

COUNTRIES:

AC

110-

120V/220-

240V~,

50/60Hz

(BS)

FOR

U.K

:

AC240V~

,

SOHZ

(G)

FOR

WEST

GERMANY

AC220V~

,50Hz|

(P}(PG)

FOR:

PACE

X

AC

110-

120V/220~

240V~

(A)

FOR

AUSTRALIA:

AC240V~

,

SOHZ

|

(£)

FOR

EUROPEAN

COUNTRIES:

AC220V~

,S0Hz|

(©)

FOR

CANADA

+

AC

120V

~

»

6OHz

(FOR

U.S.A

+

AC

120V~

,

6OHz

50/60HZ

lshows

DC

voltage

to

the

chassis

with

no

signal

in-

5.

When

replacing

the

parts

in

the

darkened

area

(

put.

and

those

marked

with

/\

,

be

sure

to

use

the

designated

indicates

positive

B

power

supply.

parts

to

ensure

safety.

indicates

negative

B

power

supply.

6.

This

is

the

standard

circuit

diagram.

indicates

signal

path.

The

design

and

contents

are

subject

to

change

without

notice.

(No,

2786)

1-6

PARTS

LIST

Contents

1.

Exploded

View

and

Part

Numbers

2.

Printed

Circuit

Board

Ass’y

and

Parts

List

2-(1)

ENF-016

0

3.

Packing

Materials

4.

Accessories

List

SEA

Amplifier

P.C.

Board

Ass’y

and

Part

Numbers

NN

ff

KD

SEA-E30B

(No.

2786)

2-1

A-E30B

1.

Exploded

View

and

Part

Numbers

2-2

(No.

2786)

Note:

Those

items

shown

on

the

disassembly

diagram

without

indication

of

reference

Nos.

are

supplied

as

assembly

parts.

SEA-E30E

|

A:

Safety

Parts

The

Marks

for

Designated

Areas

U.S.A.

Canada

U.S.

Military

Market

Europe

West

Germany

Other

Countries

Part

Number

Part

Name

Q'ty

Description

1

EFP-SEAE30

Front

Panel

Ass’y

1

E70912-001

JVC

Mark

1

2

E70851-001

Slide

knob

10

3

E71716-001

Push

Button

2

TAPE

MONITOR,SEA

4

SLR-55VC50F

L.E.D.

1

5

QSP0301-006

Push

Switch

2

|

TAPE

MONITOR,

SEA

6

QVZ5311-001

Variable

Resistor

10

7

a =

=

_

=

8

E48729-007

Plastic

Rivet

2

9

E24008-007

Metal

Cover

|

1

10

E61660-004

Specia!

Screw

4

11

SHSB3008M

Screw

i;

2

12

EMNOOTV-402A

4P

Pin

Jack

2

TAPE,

LINE

13

E24841-003

1

Rear

Panel

1

E,G

|

E24841-004

Rear

Panel

1

|

A,

BS

E24841-005

Rear

Panel

14

P,

PG,

U

E24841-006

Rear

Panel

1

J,c

14

SBSB3008M

Tapping

Screw

2

15

SDSB3008M

Tapping

Screw

i

2

AC

Outlet

Al

16

QHS3876-162

Cord

Stopper

Is

1

J,C,P,PG,£,A,G,U

A

|

QHS3876-162BS

Cord

Stopper

=

BS

Z\}

17

QMP

1200-200

Power

Cord

1

J

A|

QMP

1340-200

Power

Cord

1

c

A

QMP2560-244

Power

Cord

4

A

A

QMP3900-200

Power

Cord

1

E,G

A

QMP7600-250

Power

Cord

hi

4

P,PG,

U

A

OMP9017-008BS

Power

Cord

1

BS

A|

18

QMC0440-001

AC

Outlet

1

Cc

A

QMC0437-002

AC

Outlet

1

J

A|

19

QMF51A2-R20S

Fuse

1

P,PG,E,

A, G,

U

A

QMF51E2-R20SBS

Fuse

1

BS

A

QMF51U2-R20

Fuse

1

J,C

A|

20

ETP1000-29EBBS

Power

Transformer

1

BS

A

ETP1000-29EB

Power

Transformer

1

E,A,G

A

ETP1000-29JA

Power

Transformer

1

iC

A

ETP1000-29LA

Power

Transformer

1

/

PPG,

U

21

OST4101-E14

Power

Switch

1

4

POWER

22

E71712-002

Push

Shaft

1

POWER

23

E67628-002

Push

Button

4

POWER

24

E68587-003

Bracket

1

25

SBSB3008N

Tapping

Screw

|

8

26

E24843-001

Chassis

Base

1

27

SHSB3008N

Screw

1

28

SBSF30082

Tapping

Screw

2

29

E47227-021

Foot

4

|

30

Y¥

40434-019

Spacer

1

31

EMG7331-001

Fuse

Clip

2

32

OQSS8A22-E01

Voltage

Selector

1

P,

PG,

U

33

E65119-004

Special

Screw

2

Voltage

Selector

P,PG,U

34

GBSB3008N

Tapping

Screw

2

E69589-002

Spacer

1

AC

Outlet

(No.

2786)

2-3

|