JVC JR-S81M Manuale utente

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JF-SsiVvi/sstvWw

S81H

STEREO

RECEIVER

No.

2431

DEC.

1977

JR-S81

No.

2431

Contents

Page

1.

‘SHeCifiCatiOns:

..6

joke

e

es

Sao

e

SST

SETA

SS

SEM

Eee

SSE

TTR

SEO

ae

Tawa»

2

2.

Removal

of

Procedures

2-(1)

Top

Cover

and

Bottom

Plate...........-..

2.022

e

ee

ees

Sey

wise

Spee

eran

es

3

2:(2):

Front

Panel:

so

6.3c0c

ded

cman

dv

keaw

Gotu

wit

nde

Wee

CRESS

REISE

Se

a

24

4

3.

Main

Part

Locations

and

Part

Numbers

......

2.222222

0

ee

eee

eee

et

ees

4

4.

Exploded

Views

and

Part

Numbers

A(T).

‘Front

Panel

x

.se0coxaees

bo

cere

weaned

waded

Sed

ote

eG

%

acme

gee

5

4-(2)

Rear

Panel

si

cscs

8anee

ba

Sete

wee

eee

ee

ET

ae

ee

HE

He

aa

Oe

Se

6

5.

Dial

Stringing

Procedure

.....

2.0.0.2

eee

ee

ee

eee

eee

7

6.

FM/AM

Tuner

Alignment

Procedures

6-(1)

EM

Section

«ses<cesee

cil

anetubse

arate

ce Ge

Gas

Swe

ea

Kawa

e

es am

9

6:(2).

—

AM

Section’

cic

ae

chewed

Ma

See

eee

ee

Sea

TS

SER

OY

11

7.

Printed

Circuit

Board

Ass’y

and

Parts

List

7-(1)

TEC-20C

FM/AM

Tuner

&

Equalizer

Amp.

P.C.

Board

Ass’y

.........-00000

00s

12

7-(2)

TPS-93G

AC

Fuse

P.C.

Board

Ass'y........-.

000

eee

eee

eee

19

7-(3)

TSC-107

Speaker

Switch

P.C.

Board

Ass’y

...

2...

2...

e

eee

ee

eens

20

7-(4)

TPS-124A

Lamp

P.C.

Board

Ass’y...

2...

2.0.2.

cee

ee

ee

ene

20

7-(5)

TAP-256C

Audio

Amp.

P.C.

Board

Ass’y

...

2.2.0.0.

eens

21

7-(6)

TAC-491

Volume

and

Tone

Control

P.C.

Board

Ass’y...

2.2...

ee

es

25

8.

Packing

Materials

and

Part

Numbers

..

2.0.0.0...

cee

ee

ee

eee

eee

26

9.

Accessories

List

...

1.

ce

te

eee

eee

cee

eee

eee

eee eee

eens

27

10.

Transistor,

|.C.

and

Diode

Lead

Identification

...

1.2...

0.

ce

ee

eee

27

11.

JR-S81

Schematic

Diagram...

0...

2

ee

ee

28

12.

Parts

List

with

Specified

Numbers

for

Designated

Areas...

2...

0...

ee

ee

eee

30

Note:

When

replacing

the

parts

marked

with

Z\

_,

be

sure

to

use

the

designated

parts

to

ensure

safety.

1.

Specifications

Dimensions

(cm)

Weight

(Net)

Amplifier

Section

RMS

Power

Both

channels

driven

RMS

Power

Both

channels

driven

at

1

kHz

Total

Harmonic

Distortion

Damping

Factor

Input

Sensitivity,

Impedance

Recording

Output

Level

Frequency

Response

Bass

Control

Treble

Control

FM

Tuner

Section

Usable

Sensitivity

JR-S81M

JR-S81W

JR-S81H

15.1 15.1

15.1

(

6"

)

(

6”

)

(

6”

)

47.4

49.8

53.4

(18-11/16")

(19-5/8”)

(21-1/16")

35.0

35.0

37.0

(13-13/16”)

(13-13/16"

(14-5/8”)

9.4

kg

10.4

kg

9.6

kg

(20.8

Ibs.)

(23.0

Ibs.)

(21.2

Ibs.)

:

35

watts

per

channel,

min.

RMS

at

8

ohms,

from

20

Hz

to

20

kHz

with

no

more

than

0.5

%

total

harmonic

distortion.

:

38

W

per

channel

at

8

Q

43

W

per

channel

at

4

Q

:

0.5

%

at

rated

output

power

:40

at

8

QQ

:Phono:

2.5

mV/50

kQ

AUX:

200mV/50

kQ

Tape

Mon:

200mV/50

kQ

:

150

mV

(Pin)

30

mV/80

k&2

(DIN)

:

20

Hz

—20

kHz

“0,

dB

:

+10

dB

at

50

Hz

:£10

dB

at

10

kHz

(IHF):

Mono

12.1

dBf

(DIN):

Mono

1.2

wV/75

QQ

Total

Harmonic

Distortion

at

1

kHz

and

100

%

Modulation

Signal

to

Noise

Ratio

Selectivity

Capture

Ratio

Image

Rejection

IF

Rejection

Stereo

Separation

AM

Tuner

Section

Usable

Sensitivity

Image

Rejection

Selectivity

IF

Rejection

Signal

to

Noise

Ratio

Power

Supply

Section

S/N

26

dB,

1.8

uV/300

2

:

0.2

%

(Mono)

at

100

Hz

or

1

kHz

0.6

%

(Mono)

at

6

kHz

0.4

%

(Stereo)

at

100

Hz

or

1

kHz

0.8

%

(Stereo)

at

6

kHz

:

78

dB

(Mono),

70

dB

(Stereo)

:

70

dB

IHF

Alternated

:1.5

dB

:

60

dB

:80

dB

:

40

dB

at

1

kHz,

30

dB

at

50

Hz

to

10

kHz

>:MW

30

uV,

300

uV/m

at

1000

kHz

:MW

45

dB

:

MW

30

dB

:

MW

50

dB

:MW

55dB

Designated

Areas

Line

Voltage

&

Frequency

Power

Consumption

U.S.A.

AC

120

V,

60

Hz

175

W

(By

UL

Standard)

CANADA

AC

120

V,

60

Hz

175

W

(By

CSA

Standard)

UK

&

AUSTRALIA

AC

240

V~,

50

Hz

290

W

(By

BS

and

SAA

Standard)

EUROPEAN

CONTINENT

AC

220

V~,

50

Hz

280

W

(By

IEC

Standard)

OTHER

AREAS

e

AC

100/120/220/240

Vv

Selectable,

50/60

Hz

280

W

(By

IEC

Standard)

Design

and

specifications

subject

to

change

without

notice.

JR-S81

No.

2431

2.

Removal

of

Procedures

2-(1)

Top

Cover

and

Bottom

Plate

_

Procedure

and

Part

Numbers

JR-S81

1.

Remove

6

screws

(Item

No.

4)

through

the

both

sides

of

the

cover

and

2

screws

(Item

No.

2)

from

the

back

of

the

top

cover.

2.

Remove

the

top

cover.

3.

Remove

4

screws

(Item

No.

6)

from

bottom

plate

(Item

No.

5)

and

remove

the

bottom

plate

from

the

chassis.

SSSA3008N:

Screw

E65196-001:

Washer

oo

SDSB3008N

E61660-001

®

Ass’‘y

Screw

E22673-001

Top

Cover

E61660-001

-

Ass’y

Screw

E22411-002

®

Bottom

Plate

SBSB3008Z

Tapping

Screw

SBSB3008Z

Tapping

Screw

Fig.

3

No.

2431

=

Bice

2-(2)

Front

Panel

Procedures:

Remove

the

top

cover.

Refer

to

the

Removal

of

Top

Cover

on

the

page

3.

Pull

out

the

knobs

item

no.

1

through

no.

7

carefully.

Refer

to

Fig.

4.

Remove

three

screws

item

no.

10

located

on

the

bottom

of

the

front

panel.

Refer

to

Fig.

6.

Remove

two

screws

item

no.

11

located

on

the

top

of

front

panel.

Refer

to

Fig.

5.

Pull

out

the

front

panel

carefully.

SUR:

ee

®

E65398-001

Tuning

Knob

Front

Panel

(Side-board

Type)

Front

Panel

(Metal

Cover

Type)

Front

Panel

(Handle

Type)

EXKP020-3003

@————_4

fu.

@

Power

Knob

he

ss)

GC)

EXKP020-3003

¥

Volume

Knob

EXKP020-3003

Balance

Knob

EX

KP020-3003

Speakers

Knob

EXKP020-3003

Bass

Knob

E35481-001

Push

button

@

EXKP020-3003

Treble

Knob

Fig.

4

3.

Main

Part

Locations

and

Part

Numbers

@)

SSSB3008Z

Top

View

Tapping

Screw

TPS-124A

Lamp

P.C.

Board

Ass'y

TAC-491

Volume

&

Tone

Control

P.C.

Board

Ass’y

TSC-107

Speaker

Switch

P.C.

Board

Ass'y

Power

Transformer

Different

in

different

areas,

see

page

30.

QEY5601-141

(6800

uF/42

V)

pee

Electrolytic

Capacitors

AC

Fuse

P.C.

Board

Ass’y

TAP-256C

i

in

diff

t

Audio

Amp.

P.C.

Board

Ass‘y

.

dpe

Lik

erm

‘ww

an

TFC-20C

FM/AM

Tuner

&

Equalizer

Amp.

P.C.

Board

Ass’y

SBSB30082Z

Bottom

View

Tapping

Screw

E47227-002

Foot

SBSB3016Z

Screw

—

TFC-20C

FM/AM

Tuner

&

Equalizer

Amp.

P.C.

Board

Ass’y

Fig.

6

JR-S81

—4—-

No.

2431

4.Exploded

Views

and

Part

Numbers

4-(1)

Front

Panel

SSSB3008Z

Tapping

Screw

E10234.003

Front

Panel

Ass’y

(Including

8

Push

Buttons)

uning

Knob

£65398-001

T

8)

EXKP020-3003

Knob

Q5)

£61929-001

Fastener

t——@

Za

ol

iS

Push

Buttons

Ass’y

EXKP020-3003

£35481-001

Knob

‘

E65309-001

@)

Shaft

Cover

©,

SBSB3008Z

£10233-001

Front

Bracket

Ass’y

@®

£60210-002

Rubber

Bushing

8)

ede

Shai

(9

potter

QO

Side

Shoot

E35484-003

ining

Shaft Ass’y

Tu

E35475-001

or

@

be

©

8s

S.

zi

eu

Zi

@

os

54

ce

coma}

ig

of

o28

ae

@

§2

%

ou

os

5

<

ap

GF

83S

GE

<3

a=

ae

gs

Rs

es

oO

€

gr

of

en

™

6

2

os

€.

si

x

sz

-)

en

&

ss

$5

=

a

=

i=)

.

5

>

2

85

35

cS]

$

$

8s

o>

ee

3

&

2£sf

we

6

2

2

x

Bas

Fig.

7

ps

2

<8

os0a

Ig.

7

PO

e)

25

9

é

Qe

6

<3

~E

JEa

og

oo

O23

Bg

e5

as

qoV

ou

of

R>a

2s

2B

oo

20

2s

or

ae

on

JR-S81

No.

2431

Bie!

Tapping

Screw

©

J

JR-S81H

JR-S81W

SDSP4008NS

|

1/—=Q

E65335-001

Screw

Ass’y

E10234-001

E35379-001

E10234-002

ED92779

(ED92780)

Front

Panel

Ass’y

Handle

Front

Panel

Ass’y

Right

(Left)

Sideboard

Fig.

8

Fig.

9

4-(2)

RearPanel

E10153-003

Rear

Panel

@®

SDSB3008N

Tapping

Screw

@

®

E03572-004D

Antenna

Terminals

Board

E03721-002

Bar

Antenna

Ass‘y

E03572-004C

®

Speaker

Terminals

Board

CAUTION.

TO

PREVENT

ELECTRICAL

SHOCK,

DO

NOT

REMOVE

S

AND

COVERS.

NO

_USER-SERVICEABLE

PARTS

INSIDE,

HEFER

SERVICING

TO

QUALIFIED

SERVICE

PERSONNEL

“THIS

RECEIVER

COMPLIES.

AS

OF

DATE

OF

MANGEAET

URE,

WITH

FEC

RULES

AND

REGULATIONS

PART,

15,

SUBPART

[

e

BATING

PLATE

o

co

MANUFACTURES

BY

VICTOR

COMPANY

OF

SAPAN,

CTD.

TORYD,

JAPAN,

MADE

IN

IAPAML

Power

Cord

Stopper

©

Different

in

different

areas,

see

page

30.

Power

Cord

®

Different

in

different

\

areas,

see

page

30

E03591-40C

4-Pin

Jack

Ass’y

@

E03591-10C

Pin-jack

Ass’'y

AC

Outlet

Different

in

different

areas,

see

page

30.

E03591-001

am

4-Pin

Jack

and

DIN

Socket

Ass’y

Fig.

10

JR-S81

—6-

No.

2431

5.

Dial

Stringing

Procedure

Dial

Pointer

Ass’y

E35478-002

Roller

“C’’

@

Roller

“D”

Roller

“B”’

Tuning

Shaft

(E35475-001)

From

or

(E35484-003)

Roller

““D’”’

To

Roller

TS

Roller

alls

Pealer

[Finish]

})

||

[Stare]

—3-

“en

C'

a

wind

Tuning

Shaft

Dial

Pointer

2-1/2

turns

-

Fig.

12

Fig.

13

Dial

Drum

Dial

Cord

(E32757-019)

To

Roller

“A”

Fig.

11

wind

2-1/2

turns

From

Roller

“E”

Dial

Spring

(E49698-001)

_—_

Dial

Drum

(E35474-001)

Fig.

14

Procedure:

(1)

Remove

a

heatsink

and

an

Audio

Amp.

P.C.Board

Ass’y

(TAP-256C),

see

page

8.

(2)

Remove

the

dial

pointer

and

old

dial

cord.

(3)

Tie

end

of

new

dial

cord

to

one

end

of

dial

spring,

connect

other

end

of

dial

spring

of

bottom

right

eye

inside

dial

drum,

see

Fig.

14.

(4)

Rotate

the

tuning

capacitor

dial

drum

to

it’s

maximum

counterclockwise.

(5)

Run

the

dial

cord

through

the

slot

in

the

rim

of

dial

drum.

(6)

Guide

dial

cord

under

and

around

rollers

A,

B,

C

and

D.

Keep

the

dial

cord

taut

during

this

procedures.

(7)

Pull

dial

cord

taut

and

wrap

2

turns

counterclockwise

around

tuning

shaft.

Refer

to

Fig.

12.

(8)

Guide

dial

cord

around

roller

E.

(9)

Guide

dial

cord

under

and

around

the

dial

drum

and

wind

2-1/2

turns

counterclockwise,

see

Fig.

14.

(10)

Turn

the

tuning

shaft

to

rotate

the

dial

drum

fully

counterclockwise

and

fully

clockwise

to

distribute

the

tensioning

along

the

dial

cord.

(11)

Place

the

dial

cord

over

and

under

the

tabs

on

the

rear

of

the

dial

pointer

and

place

the

dial

pointer

on

the

top

of

the

dial

panel

rail.

Refer

to

Fig.

13.

(12)

Turn

the

tuning

shaft

clockwise.

Slide

the

dial

pointer

to

ZERO

(0)

calibration

marker

on

the

logging

scale

while

holding

tuning

shaft

fully

clockwise.

Cement

the

dial

pointer

to

the

dial

cord

to

prevent

the

slippage.

Allow

cement

to

dry

thoroughly.

(13)

Check

the

dial

calibration.

Refer

to

FM/AM

Alignment

Procedures

on

page

9.

JR-S81

No.

2431

=f

Removing

the

heat

sink

and

audio

amp

P.C.

board

ass’y

(TAP-256C)

Top

View

Bottom

View

Nea

e

@

—_______

3

*,

@

©

o—#—¥a

.

sii

tious

@

cmc

|

ea

So

commence

(7

ial

5]

Lr

is

————,

®

_

\

So

—

£22011-001

SS

TAP-256C

;

Heat Sink

=a

aan

Audio

Amp.

i

Se

eens

P.C.

Board

Ass’y

i

+

emma

commen

©

Af

fa.

—-—

>,

®

©

—

e

tibia.

Fig.

15

Fig.

16

Procedure:

Remove

plugs

and

screws

according

to

the

steps

below:

Step

1:

4

plugs

(Item

No.

1

through

No.

4)

Step

2:

2

screws

(Item

No.

5

&

6)

Step

3:

5

screws

(Item

No.

7

through

No.

11)

“MARK"’

Precaution

Reconnect

the

female

plug

to

proper

position

as

indicated

‘‘MARK”’.

Refer

to

Fig.

17.

a

fe)

°

°

ae)

fe

.

7

pins

8

=

8

9

pins

8

=

3

fe

3

pins

OF.

TAP-256C

;

|

Audio

Amp.

P.C.

Board

Ass’y

|

5

pins

Fig.

17

JR-S81

ae:

ee

No.

2431

6.

FM/AM

Tuner

Alignment

Procedures

TFC-20

FM/AM

Tuner

&

Equalizer

Amp.

P.C.

Board

Ass’y

Rear

View

T401

R304

BLU

RED

©le

¢

[JS

666

L403

TAB

NO.

136

11th

Pin for

AM

IF

Stage

Adjustment

Switch

positions

for

FM

adjustment,

\

Fig.

20

Switch

positions

for

AM

adjustment

6-(1)

FM

Section

Discriminator,

Center

Meter,

Distortion

and

Signal

Gain

Distortion

Meter

AC

VTVM

RF

Generator

Oscilloscope

Fig.

21

1.

Connect

an

RF

generator,

1

kHz

modulation

and

75

kHz

deviation,

to

the

antenna

terminals

on

the

rear

panel

through

a

dummy

antenna.

2.

Connect

an

oscilloscope,

distortion

meter

and

VTVM

to

the

Rec.

Out

Jacks

on

the

rear

panel.

3.

Tune

to

a

frequency

where

there

is

no

broadcasting.

4.

Adjust

the

bottom

core

of

T201

so

that

the

center

meter

indicates

“0”

(zero).

5.

Set

the

generator

to

98

MHz.

6.

Set

the

dial

pointer

to

98

MHz.

7.

Adjust

the

top

core

of

T201

so

that

the

distortion

is

minimized

at

a

value

less

than

0.4

%.

JR-S81

No.

2431

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