Sherwood R-725/RDS Manuale utente

SERVICE

MANUAL

R-725/RDS

+

AV-725

AUDIO/VIDEO

PRO-LOGIC

RECEIVER

=

CONTENTS

«

SAFETY

PRECAUTIONS

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SPECIFICATIONS

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ELECTRICAL

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DESCRIPTION

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5

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:

MECHANICAL

PARTS

LIST

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15

SCHEMATIC

DIAGRAMS

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EXPLODED

VIEW

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SCHEMATIC

DIAGRAMS

(IV),

(V),

(V0)

«-

*

A

PRODUCT

OF

AV-725

OMITS

ONLY

TUNER

PART

TO

R-725

G

Sherwood.

SAFETY

PRECAUTIONS

WARNING

Before

servicing

this

unit,

familiarize

yourself

with

the

following

precautions:

1.

Many

electrical

and

mechanical

parts

in

this

exposed

metal

parts

of

the

cabinet,

such

as

chassis

have

special

safety

characteristics

that

often

pass

unnoticed

and

the

protection

afforded

by

them

cannot

necessarily

be

obtained

by

using

replacement

components

rated

for

higher

voltge,

wattage,

etc.

Replacement

parts

that

have

these

special

safety

characteristics

are

identified

in

this

manual

and

its

supplements:

electrical

components

having

such

features

are

identified

by

!

in

the

schematic

diagram

and

the

parts

list.

Before

replacing

any

of

these

components,

read

the

parts

list

in

this

manual

carefully.

The

use

of

substitute

replacement

parts

that

do

not

have

the

same

safety

characteristics

as

specified

in

the

parts

list

may

create

shock,

fire,

or

other

hazards.

.

Before

returning

the

set

to

the

customer,

always

do

an

AC

leakage

current

check

on

the

terminals,

screw

heads,

and

metal

overlays,

to

be

sure

the

set

is

safe

to

operate

danger

of

electrical

shock.

Plug

the

AC

line

cord

directly

into

a

120

V

AC

outlet

(120

V

AC

version

only).

(Do

not

use

a

line

isolation

transformer

during

this

check.)

Be

sure

your

AC

voltmeter

has

a

sensitivity

of

5000

£2

per

volt

or

greater.

Then

connect

a

1500

{2

10

watt

resistor,

paralleled

by

a

0.15

uF

150

V

AC

capacitor,

between

a

known

good

earth

ground

(such

as

a

water

pipe,

or

conduit)

and

the

exposed

metalic

is

parts,

one

at

a

time.

Measure

the

AC

voltage

across

the

combination

of

a

1500

(2

resistor

and

a

0.15

,1F

capacitor.

Reverse

the

AC

plug

at

the

AC

outlet

and

repeat

AC

voltage

measurements

for

each

exposed

metalic

part.

Voltage

measured

must

not

exceed

0.75V

RMS.

This

corresponds

to

0.2

mA

AC.

Any

value

exceeding

this

limit

constitutes

a

potential

shock

hazard

and

must

be

corrected

immediately.

At

5000

©

per

volt

or

greater

sensitivity

,

the

reading

should

not

exceed

0.75

V.

AC

Outlet

AC

Voltmeter

Good

earth

ground,

such

as

a

water

pipe

or

conduct.

0.15

#F

150V

AC

Place

the

probe

on

each

exposed

metalic

part.

SPECIFICATIONS

a

FRONT

AMP

SECTION

Measuring

methods

are

based

on

IHFand

IEC

standard

268-3.

Measurements

conditions,

unless

otherwise

noted

:

*

Output

resistive

load

:

8

ohms/Both

channel

driven

*

Tone(Bass,

Treble),

Balance,

EQ

control

:

Center

Position,

Other

SW's

:

OFF.

*

Nominal

input

level

:

5

mV

for

MM,

0.5

mV

for

MC,

500

mV

for

general

purpose

inputs.

*

Power

figures

should

be

kept

minimum

10

min.

between

15

and

35

c.

*

Terminator

:

100

ohm

for

MC,

1

kohm

for

MM

and

general

purpose

inputs.

*

Filter

:

IHF-A

filter

*

R/O:

Rated

Output

|

NO

|

DESCRIPTION

|

__

INPUT

FREQ.

|

REMARK

|

UNIT

LIMIT

|

NOMINAL

'

4

‘Input

Sensitivity

AUX

;

1

KHz

mV

200+50

|

200+30

MM

|

1

kHz

mV

2.5+0.5

|

25+03

"2

|Channel

Balance

AUX

1

kHz/R/O

TO

-40dB)

dB

+3

+2

|

1

kHz|-40

TO

-60dB/

dB

+6

+4

(3

|Residual

Noise

AUX

1

kHz)

VOL

min.

mV

A

ced

||

|

4

Total

Harmonic

Distortion

AUX

(500mV)

20Hz)

R/O

1W

%

<0.2

<0.09

|

1kHz

-

%

<0.2

<0.09

!

|

|_20Hz

:

%

<0.3

<0.2

|

5

(Continuous

Average

Power

AUX

|

20Hz

8ohms

WwW

130

132

r

at

(0.2)%

THD

1kHz

:

Ww

|

130

132.

|

20Hz

WwW

130

132

6

IMD(SMPTE)

|

AUX(500mvV);

60Hz=4

R/O

%

<0.2

<0.09

ae

7kHz=1

1w

%

<0.2

<

0.09

|

7

|S/NRATIO,

IHF-A

FILTER

|

AUX(500mvV)

1kHz

R/O

dB

>90

|

3>93

|

MM(5mvV)

1kHz

R/O

dB

>68

2i2

|

8

|Channel

Separation

AUX(500mvV)

100Hz|

R/O

-3dB

dB

>45

>55

1kHz

.

dB

>45

>

55

10kHz|

.

dB

>40

>45

{

9

|Function

Crosstalk

CDSAUX

,

1/10

kHz

7

dB

>60/40

|

>65/45

|

;

AUX->MM

1/10

kHz

:

dB

>

60/40

>65/45

|

MM

->AUX

|

1/10

kHz

|

:

|

dB

>

60/40

>

65/65

|

;

10

|Frequency

Response

(-3dB)

|

AUX(500mvV)

Iw

i{Hz~kHz;}

20~50

10~6)

11

|

Tone

Control,

+10dB

AUX

100Hz

|

1Ww

dB

+10+2

+1041

|

[|

|

10kHz

1W

dB

|

+10+2

|

+1021

:

12

|Subwoofer

Out

sub-vol

+6dB

[AUX(200mvV)

|

1kHz

|

M-Vol

Max

Vv

|

2+0.5

2+0.3

|

13

|Phono

Equalization

PHONO

100Hz

|

TAPE

OUT

dB

RIAA+1.5

RIAA1

10kHz

i

dB

|

RIAA+1.5|

RIAA+1

;

14

|Input

Overload

at

0.5%

THD

il

MM

1kHz

TAPE

OUT

mV

>120

>

14¢

|

15

DIN

Power

at

1%

THD AUX

__tkHZ

|

R/O

W

>

135

>

14(

'

16

|Muting

Level

AUX(500mV);

1kHz

R/O

dB

>60

>65

~@

REAR

AMP

SECTION

Measurements

conditions

:

Input

level

300mV,

Rear

level

maz.,

Master

volume

adj.

delay

time

20ms

|

NO

DESCRIPTION

INPUT

FREQ.

REMARK

|

UNIT

LIMIT

|

NOMINAL

'

4

|Power

Output

0.7%

THD

AUX

|

1kHz

|

80hms

Ww

>50

>52

"2

Total

Harmonic

Distortion

AUX

|

_1kHz

1W

%

|

<1

<0.7

_

3

|SIN

Ratio

DOLBY

AUX

_|

__R/O

dB}

55

>63

‘THF-A

Filter

STADIUM

AUX

|

:

dB

>55

|

263

!

THEATER

AUX

i

:

dB

>55

|

>63

ose

HALL

AUX

:

dB

>50

|

363

4

|

Frequency

Response

AUX

|

1kHz

|

1W

Hz~kHz,|

100~6

80~7

‘at+3dB

(ONLY

DOLBY)

|

AUX

|

;

«

CENTER

AMP

SECTION

Measurements

conditions

:

Input

level

300mV,

WIDE

mode

Center

level

max.,

Master

volume

adj.

NO

DESCRIPTION

|

INPUT

|

FREQ.

REMARK

!

UNIT

|

LIMIT

|

NOMINAL

|

'

1

|Power

Output

at

0.3%

THD

AUX

|

IkHz

Bohms

|

W

|

_2130

>

132

2_|Total

Harmonic

Distortion

AUX

|__1kHz_

1W

%

|

<03

<0.2

|

3

‘S/N

Ratio,

IHF-A

Filter

AUX

|

R/O

dB

>73

>78

4

|Frequency

Response

|

IDOLBY

MODE

NORMAL

AUX

1wW

iHz~kHz)

_120~20

|

100~30

|

WIDE

AUX

1wW

/Hz~kHz}

60~20

40~30

|

@

VIDEO

SECTION

NO

|

DESCRIPTION

"INPUT

FREQ.

REMARK

|

UNIT

|

LIMIT

|

NOMINAL

|

1

|Output

Level

at

750hms

|

VCR1(1Vp-p)|_1MHz

|

Vp-p

|

140.2)

1401

|

2

Frequency

Response

"

1MHz

'Hz~MHz

DC~6

|

DC~63

|

3

|S/N

Ratio

:

4MHz

|

dB

|

40

|

45

|

4

|Crosstalk

"

1MHz

7B

40

45.

|

a

AM

SECTION

Measuring

methods

in

confirmity

with

IEC

standard

315

Measurements

condition

AM

-

MW

*

Radio

frequency

=

1000/999kHz,

Audio

frequency

=

400Hz

“LM:

Radio

frequency

=

207kHz,

Audio

Frequency

=

400Hz

*

Reference

level

=

5

mV/m,

10

mV/m

on

50

ohms

*

Test

point

:

MW

TP1=594

kHz,

TP2=999

kHz,

TP3=1404

kHz

(USA

Version)

“

Test

point

:

MW

TP1=600

kHz,

TP2=1000

kHz,

TP3=1400

kHz

(Europe

Version)

*

Test

point

:

LW

TP1=162

kHz,

TP2=207

kHz,

TP3=1404

kHz

(USA

Version)

*

Test

point

:

LW

TP1=600

kHz,

TP2=1000

kHz,

TP3=1400

kHz

(Europe

Version)

NO)

DESCRIPTION

VERSION

|

UNIT;

LIMIT

|

NOMINAL

|

1

|Tuning

Cover

Range

LOW~HIGH

USA

|

kHz

|

§20~1710

|

EUROPE

|

kHz

|

522~1611

iSTEP

USA

si

kHz

10

=

EUROPE

kHz

__

9

|

2

\Usable

Sensitivity

MW

TP1

USA

|

uv/im

,

<800

|;

<500

|

TP2

uVim

|

<800

<500

i

TP3

uvim

|

<800

=

<500

|

MW

TP1

EUROPE

uvVim

<800

,

<500

|

TP2

uV/m

<800

<500

|

TP3

uV/im

|

<800

<500

|

3

"SIN

Ratio

MW

USA

dB,

235

|

>40

EUROPE

dB

>40

|

>45

4

‘Total

Harmonic

Distortion

USA

%

<2

<1.0

|

EUROPE

%

<1.5

<10

|

5

Over

Load

Distortion

5

mV_80

%

MOD

ty

=

10

<5

|

6

(Frequency

Response

at

-

6

dB

MW

|

Hz

|

100~2K

80~2.2K

|

7

|Selectivity

10

kHz/

9

kHz

MW

|

dB

|

320

>25

|

8

AGC

Figure

of

Merit

dB

|

550

355

|

9

‘Image

Rejection

MW

=

TP3

i

|

dB}

330

335

|

10

|Whistle

Modulation

Input=1mV/m_

21F

|

%

<15

—

<

10

|

11

|Auto

Stop

Level

MW

uV/m_

|

800(

+

6dB);

800(

+5dB)

|

12

Tuned

Level

MW

__uV/m_

|

800(+6dB)

800(+

5dB),

_

13

‘Output

Level

mV

165+50

165+30

|

a

FM

SECTION

Measuring

methods

in

confirmity

with

IEC

standard

315

Measurements

condition

FM

:

Radio

frequency

=

98.1

MHz,

Audio

frequency

=

1kHz

*

Reference

level

=

1mV

on

(

75

ohms,

300

ohms

)

*

Deviation

:

MONO

=

+75kHz,

Stereo

=

+67.5kHz

+7.5kHz

(USA

Version)

MONO

=

+40kHz,

Stereo

=

+40kHz

+7.5kHz

(Europe

Version)

*

Test

Point

:

TP

1

=

90.14MHz,

TP2

=

98.1MHz,

TP

3

=

106.1MHz

*

Filter

=

B.P.F

at

STEREO

~NO:

DESCRIPTION

VERSION

|

UNIT

LIMIT

|

NOMINAL

|

1

Tuning

Renge

LOW~HIGH

|

USA

|

MHz

|

87.5

~

107.9

oa

Europe

|

87.5

~

108.0

‘Step

AUTO/Man

USA

kHz

;

200

fo

Europe

100/50

|

2

|Usable

Sensitivity

TP

1

i

USA

|

GBF

|

<17.2

<14.2

|

SIN

=

30

dB

TP

2

|

dBf

;

<17.2

<14.2

|

TP

3

|

dBf

<17.2

<14.2

|

‘S/N

=

26

dB

TP

1

Europe

qBf

|§

<202

(|

<17.2

TP2

|

dB

|

<20.2

<17.2

|

TP

3

|

=a

dBf

<20.2

<17.2

3

Full

Limiting

Sense

Output

=

-3

dB

|

USA

|

dBf

<152

|

<122

|

Europe

|

dBf

|

<20.2

<17.2_|

|

4

‘Auto

Stop

Level

2

dBf

|

31.245

|

31.24+3

|

5

Auto

Error

USA

1

KHz

|

0

64200

|

425

1

|

|___

Europe

kHz

+15

|

+20

6

S/N

Ratio

MONO

|

dB

>64

>68

|

STEREO

dB

260

|

=64

|

7

‘Total

Harmonic

Distortion

MONO

%

<05

|

<O03

|

STEREO

|

%

|

<08

<O.5

|

_

8

'50

dB

Quietion

Sensitivity

MONO

|

USA

|

GBF

|

<23.2

|

<202

|

STEREO

|

dBf

§

<48.3

|

<453

|

46

dB

Quietion

Sensitivity

MONO

___

Europe

qBf

=

<232

<202

|

STEREO

|

___OBf

<483

<453

|

9

|Channel

Separation

100

H2z

|

dB

235

i

>40

—_

1

kHz

dB

6340,

345

oa

10

kHz

|

dB

|

230

|

235

10

|Frequency

Response

at

+1.5

dB

|

I

Hz

20~12.5

10~14

|

11

Spurious

Response

|

USA

|

dB

|

270

|,

>80

|:

po

4

Europe

|

dB

>

80:

>90

|

12

|IF

Rejection

TP

1

|

4B

|

=70

>80

|

13

Image

Rejection

TP

3

USA

dB

386560)

|

«0365

a

___Europe

|

OB

|

=70

|

>80

|

14

:AM

rejection

Ratio

|

;

dB

>50

i:

355

|

15

_

Capture

Ratio

{__

dB

22.5.)

22

|

46

.Alternative

CH

Selectivity

+400

kHz

|

dB

|

245

|

>860

'

17

‘Output

Level

MONO

|

mV

|

500+150

|

50+100

|

48

[RDS

Sensitivity

(Europe

|

dBf

|

<40.2

|

«382

|

w=

GENERAL

Power

consumption

----------

rrr

crt

rte

r

rer

ctee

USA/Canada

:

4.5A,

Europe

1

100W

Power

Supplies

+--+

=s<se-ise

snes

e

neste

es

ee

Seite

reese

s

USA/Canada

:

AC

120V,

60Hz

Europe

:

AC

230v,

5OHz

Dimensions

(WxHxD)

-----++--0

rrr

cre

rrr

retest

cress

440

x

140x380

mm

17-5/16

x

5-1/2

x

14-1546

inchs

Weight

(Net)-

--------------2-e

eer

e

rte

rere

eee

renee!

15.9

kg

(31.3

3

Ibs)

CIRCUIT

DESCRIPTION

1C301

:

CXP82840

1.

Description

GRID

SEGMENT SEGMENT

NromwmDnwonrtrranr

oo

SBE6SESSOGRRLHTHLSAKAAe

See

LLEEEEE

LET

EILE

LETT

Ty

{oXOSOBLOTIOELOSIOAOSIO2O

NOVES/BEE7(BEKB5)/041ESE216')

G7

O-—

@0)—+O

GRID

eae

ae

NC

O—

(78)—+O

POWER

DOWN

O—+

77)—+O

RDS

CHECK

O—+

(764)

—+O

RDS

START

O—+(6)

75)—-O

ENCODER

UP

O—+(7)

?4)—+O

REMOTE

O—+(8)

73—+O

ENCODER

DOWN

O—+(9)

?3—-O

NC

O—(10)

?71)—+O

NC

O—(11)

(70)—+O

MAIN

-

MUTE

O-«—(12)

69)—+-O

AMP

DATA

O=—(13)

68)—+O

AMP

CLOCK

O-—(14)

67)—-O

NC

O—(15)

CXP-82840

66)—+O

INt

O—+(6)

63—-O

kevin

|

N2

O-*G2

64)—-O

IN3

O—(18)

63)—+O

IN4

O—+(19)

62—-O

DIGI-

LINK

O--+(0)

61\—+O

MODEL-OPTION

O—+(21)

)

RDS

CLOCK

O-—(22)

69—-O

RDS

DATA

O-—(23)

G3)—+O

CENTER-

MUTE

O-—(24)

67)—+O

REAR

MUTE

O-—@5)

66)—+O

7001-

DATA

O«—(26)

65)—+O

7001-

CLOCK

O+—@7)

64)—+O

VREF

O—@8)

O

SLEEP

O—+(29)

62)—+O

PROTECT

O—+(0)

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ST-BY

RELAY

NC

TUNER

MUTE

C7821

C.E

TC

9299

C.E

LM

7001

C.E

VCR2

F/R

AMP

MUTE

NC

CINEMA

BASS

4094A

C.E

2.

Input/Output

Terminal

Functions

G2/G1

Grid

signal

output

for

FIP.

POWER

DOWN

|

Input

for

power

down(Active

low).

RDS

CHECK

Input

for

RDS

check.

RDS

START

Input

for

RDS

start.

ENC

UP/DOWN

|

Input

for

Encoder

up

and

down.

NC

REMOCON

Input

for

remote

control

signal.

(Active

low).

Puc

[hte

Output

for

main

mute.

1/2

3

4

5

7/19

10/11

12

MAIN

MUTE

Output

is

low

level

under

the

following

conditions.

1.

When

power

is

turned

on

or

off.

2.

When

function

is

changed.

3.

When

MONO

or

STEREO

is

changed.

4.

When

Low

level

is

inputed

to

"PROTECTION"

port

of

CPU.

5.

When

mute

signal

is

received

from

the

commander.

Output

datasignal

to

MC14094,

LC7821,

LC7822

and

TC9299.

Output

clock

signal

to

MC14094,

LC7821,

LC7822

and

TC9299.

Input

for

selecting

Model.

('L'>R525,

'H'R-725,

AV725)

C-MUTE

Output

for

center

mute.

Output

is

low

level

under

the

following

conditions.

1

2

3

4

15

0

1

2

23

24

1.

When

power

is

turned

on

or

off.

2.

When

center

mode

is

on

or

off.

3.

When

center

mode

is

switched.

C-MUTE

4.

When

test

tone

mode

is

on

or

off,

When

the

channels

is

changed

S-MUTE

the

test

tone

mode.

5.

When

Low

level

is

inputed

to

"PROTECTION"

of

CPU.

6.

When

mute

signal

is

received

from

the

commander.

24

5

2

Output

for

surround

mute.

Output

is

low

level

under

the

following

conditions.

1.

When

power

is

turned

on

or

off.

2.

When

surround

mode

is

on

or

off.

.

When

test

tone

mode

is

on

or

off,

When

the

channels

is

changed

oo

the

test

tone

mode.

.

When

delay

time

is

changed.

5.

When

Low

level

is

inputed

to

"PROTECTION"

of

CPU.

6.

When

mute

signal

is

received

from

the

commander.

26/27

|

7001-DATA/CLK

|

DATA/CLOCK

Singnal

output

for

LM7001.

AV

REF

Referance

voltage

of

analog

A/D

converter.

2

SLEEP

OPTION

|

Input

for

selecting

function.

('H'—St-by,

'L'-Sleep.)

PROTECTION

Signal

input

for

protection

wher

low

level

is

inputed,

it

ischinged

to

STAND-BY

mode.

STEREO

Input

for

lighting

the

ST(Stereo),

Inaicator(Active

low).

S-METER

Input

signal

level

of

tuner.

SUBWOOFER

inplut

for

selecting

subwoofer,

when

high

level

is

inputed

subwoofer

volume

OPTION

is

operates.

35

STEP

According

to

region,

input

for

selecting

the

frequency

bands

and

steps

for

FM

and

AM

Settings

are

as

follows

FREQUENCY

BAND

_—STEP

USA/

FM:

87.5

~

107.9

MHz

200

kHz

AM:

520

~

1710

kHz

10

kHz

EUROPE

|

FM:

87.5~108

MHz

50

kHz

aaa

AM:

522

~

1611

kHz

9

kHz

KOREA

FM:

87.5

~

107.9

MHz

200

kHz

eee

AM:

522

~

1611

kHz

9

kHz

Input

for

selecting

set.

(65V--RDS

Receiver,

2.5V—+Amp,

0V—Receiver)

Input

for

resetting

CPU.

(Active

high)

39/40

Input/Output

for

cystal

oscillator.

41

Ground.

8

AS)

30

31

32

33

34

36

37

38

nc

[NetwesSC—“S*s*s*~“‘“S~*Ss*s—‘“—s~‘s~s~S~*Y

D

F

|

==

vDD

|

Power

supply

of

CPU(+5V)

G

V

;

v

CE(

:

E(

ideo).

42

43

44

45

46/47

48

49

50

51

52

53

D

L

)

4

AMP-MUTE

When

the

power

is

on,

contro!

data

output

is

high

after

3

seconds.

nn

When

the

power

is

off,

control

data

output

is

"L".

VCR2

OPTION

Output

signal

for

VCR2

Inputs.

(‘H'-Front,

'L'-Rear)

CE(7001)

LM7001

chip

enable.

CE(9299)

TC9299

chip

enable.

(Surr-Subwoofer

Trim)

CE(7821

LC7821

chip

enable.

(Function

select)

N

Output

is

high

level

under

the

following

conditions.

1.

When

power

is

turned

on

or

off.

2.

When

tuner

band

is

changed.

3.

When

tuning

up

or

down

button

is

pressed.

4.

When

preset

button

is

pressed.

5.

When

displayed

preset

number

is

changed

during

memory

scan.

6.

When

Low

lever

is

inputed

to

"PROTECTION"

of

CPU.

T-MUTE

Output

for

tuner

mute.

)

ST-BY

Output

for

driving

power

relay.

(Active

high)

D

55

56

57

58

59

7.

When

mute

signal

is

received

from

the

commander.

61

vi

90-94

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28

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32

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1

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Grid

5.

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Sherwood R-725/RDS Manuale utente

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