Sharp RG-7050E Manuale utente

SHARP

SERVICE

MANUAL

ATSMY80198CST

RG-7050E

es

.

iu

Seaurous

nwo

errnusson

system

2

EM

88-02-96

{402-108

ot

: :

“RAW

340-2700.

4200

‘ 4

AVION

TECHES

SIORUSIEMDRGCR

UALS

STSHEO

CW

E50

=

170

20.

i

ma

28

5

ey

i

Sethe.

“1

*SY

SEL

ME

GAORSMATIQUE

ADE

-t

ASUPPA

SOR

OLGA

‘nd

PSS

Oe

SAPROGRAM

020

‘In

the

interests

of

user-safety

the

set

should

be

restored

to

its

original

condition

and

only

parts

identical

to

those

specified

be

used.”

|

r

gn

4

nee.

@

APSS

Auto

Program

Search

System

Solid

State

In-dash

Type

Cassette

Car

Stereo

Player

with

LW/MW/FM/FM

Stereo

Radio

and

ANSS

MODEL

RG-7050E

In

the

RG-7050E

Service

Manual

the

following

are

not

described,

and

for

their

details

please

refer

to

the

RG-5900H/E

Service

Manual

already

issued.

1.

Circuitry

Description

2.

Power

IC

Replacement

INDEX

TO

CONTENTS

1.

Specifications

2...

0.

ee

ee ee

ee

2

9.

Block

Diagram

of

Integrated

Circuit........

15~17

2.

Dial

Cord

Stringing

..

2...

ee

2

10..Packing

Method.

.......

elie

Nit

le

deaigted

wo

Dae

18

3.

Front

and

Rear

Parts

Layout...........0..00.

3

11,

Mechanism

Exploded

View............-000-

19,

20

A.

Disassembly:

se

piese

elamenec

sin

wistats

ete

ha

ae

Bae

ate

4

12.

Wiring

Side

of

PW.

Board...

1...

0...

eee

21,22

5.

Block

Diagram

..

0...

eee

5,6

13.

Schematic

Diagram

1.0.0.0...

ce

eee

23,24

6.

General

Alignment

Instruction

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

7~11

14.

Cabinet

Exploded

View

.............0000-

25,

26

Yael

2)

5

|

126

aE

ae

ee

12

15.

Transistors

Type

..

2.2...

eee

eet

eee

27

8.

Mechanical

Adjustment.........0........0-

13,14

16.

Parts

List...

2...

000.

ea

oe

ee

meee

28

~

32

_

SHARP

CORPORATION

osaka.

JAP

SPECIFICATIONS

GENERAL

TAPE

PLAYER

SECTION

Type:

«Solid

State

In-dash

Type

4-Track

2-

Playback

system:

4-track,

2-channel:.

Stereo

channel

Auto

Reverse

Cassette

Car

Using

tape:

Philips

standard

compact

cassette

tape

Stereo

Player

with

built-in

LW/MW/FM/

Tape

speed:

4.75

cm/sec.

:

FM

STEREO

3

band

Radio

and

APSS.

Wow

and

flutter:

0.35%

(DIN.

45

511)

Power

source:

12V

(for

negative

earthing

car

only)

Frequency

response:

50Hz

~

10

kHz/—6

dB

Output

impedance:

4

ohms/channel

Fast

forward

time:

120seconds

(@

C-60

cassette

tape)

Semiconductors:

16-transistor

(1-FET),

18

diode

(4-

Motor:

D.C.

motor

with

mechanical

governor

LED)

and

6-IC

{integrated

circuit)

“*

Qutput

power:

8W

+8W

(maximum

power)

RADIO

SECTION

.

BW+5W

(at

10%

distortion)

Frequency

range:

LW

150

~

285

kHz

S/N:

54

dB

MW

520

~

1,620

kHz

Dimensions:

178

(W).

x

148

(D)

x

44

(H)

mm

.

FM.

87.6

~

108

MHz

Weight:

1.6

Kg

IF:

LW/MW

452

kHz

FM

10.7

MHz

Sensitivity:

LW

400

pV/20

dB

FM.

2.5

uv

3

Turns

Figure

2

DIAL._

CORD

STRINGING

—2=

a

PARTS

LAYOUT

1.

Tone

Control

Knob

(JK

NBKO204AFSA)

2.

Power

ON-OFF/Volume

Control/Balance

Control

Knob/

Cassette

Ejection

Button

(JKNBKO203AFSA)

.

APSS

Knob

(JKNBPO119AFSA)

.

Cassette

Compartment

(GFTAC1144AFSA)

APSS

Indicator

(VHPGL-9NG519F)

Tape

Travel

Direction

tndicator

(VHPGL-9NG6/-1)

DAR

w

®

Qa

©

®

@

.

FM

Stereo

Indicator

(VHPGL-9PRQ/-1)

.

Tuning

Contro!

Knob

(JKNBKO203AFSA)

.

Fast-forward

Winding

Knob

(JKNBPO119AFSA)

.

Program

Selector

Knob

(JKNBPO119AFSA)

.

Antenna

Trimmer

(TC1)

(RTO-A1056AFZZ)

.

Band

Selector

Knob

(JKNBPO119AFSA)

——

Figure

3—1

FRONT

PARTS

LAYOUT

13.

Antenna

Socket

(QSOCZ0015AFZZ)

14.

DC

Input

Terminal

(QSOCD0271AFZZ)

15.

Earth

Terminal

16,

Speaker

Terminal

(QSOCD0271AFZZ)

Figure

3-2

REAR

PARTS

LAYOUT

a

1a

ain

ae

DISASSEMBLY

ps

\t

Remove

the

two

(2)

screws

from

the

cabinet.

@

Remove

the

two

(2)

screws

from

the

Mechanism

chassis.

Remove

the

Top

cabinet,

then

take

it

out.

(See

Fig.

4—1)

(See

Fig.

4—3)

Remove

the

two

(2)

screws

from

the

nose

piece,

then

®

Pull

out

the

four

(4)

wiring

connecting

sockets

provided

take

it

out.

(See

Fig.

4—2)

on

the

printed

wiring

board.

©

Unsolder

the

two

(2)

leads

from

where

the

APSS

PWB.

(See

Fig.

4—4)

ee)

BAF

BB

92

—

96

——

$0.2

from

108

—ommt

©

$60

700m

1290-180

eM

LW

S097

—

200——

240

e285

nn

KE

APS

—

ee

PROGRAM.

x

7

nw:

Figure

4—1

Figure

4—2

Figure

4—3

Figure

4—4

—4—

wy

ANTENNA

\i/

VR1

Muting

curve

Adjust

V.C.0.

Adjust

VRS

bm

cure

@){e}0

|

:

FM

FRONT

END

1

AFC(5)

(6)

TL2]

)

(5)

RF

COIL

6

0

MW

LW

MW

LW

[

4

sreREO

INDICATOR

+B

D301

I

Osc

COIL

LW

osc

LW

RF

°

Som

ral

(4)—

MW

OSC

Lw

osc

5.6yH

PLI

PLe

PL3

!

wD)

@

J

ANT

COIL

(1)

TLI

uw

SWI-8

@)

=

Lto

ot

D303

SWI-A

1C4

1”

TAPE

LIZ

(5)

INDICATOR

AM

RF-OSC

IF-DET

Dl

b2

(7)

D4

©

APSS

Circuit

eee

ae

Pre

INDIC.

To

Q7

HEAD

FORWARD

e)

Th

zy,

O

DIO3

Power

AMP

L-ch

=

REVERSE

VRIOI

I

SW403-A

Volume

$so2

vee

©]

ten

(i)

;

{

Sh

Speaker

Terminal

SP

FORWARD

O

]

vrRios

3

(5)

oo

o

1

Tone

|

(7)

()|

Rech

REVERSE

vrio2

C

$W403-8

Usiume

+B

a6

av)

fe

Playback

Head

Power.

eM

Fi

To

Swao2

(07)

Xo

Li2

O

pact

0

De

+av

sw2

PTL

con

.

DC

Input

plo2

:

DIO!

Terminal

Figure

5

BLOCK

DIAGRAM

a

.

-6—

~

(Front

End)

|

ee

TC2

(Front

End)

Tuner

Unit

(Front

End)

ie

LS

Figure

7

ALIGNMENT

POINT

~7—

“aie

nonymetioeetpe

aisoinma

piel

eins

eee

eed

GENERAL

ALIGNMENT

INSTRUCTIONS

Should

it

become

necessary

at

any

time

to

check

the

alignment

of

this

receiver,

proceed

as

follows;

1)

Connect

an

output

meter

across

the

speaker

voice

coil

lugs.

2)

.

Set

the

volume

control

at

maximum.

3)

Attenuate

the

signals

from

the

generator

enough

to

swing

the

most

sensitive

range

of

the

output

meter.

4)

Use

anon-metallic

alignment

tool.

5)

Repeat

adjustments

to

insure

good

results.

LW/MW

ALIGNMENT

CHART

Set

the

band

selector

switch

at

“MW”

or

“LW”

position.

SIGNAL

GENERATOR

CONNECTION

TO

INPUT

SIGNAL

RECEIVER

FREQUENCY

RECEIVER

BAND

STEP

Connect

signal

genera-

|

Exactly

452kHz

High

end

of

dial

|

Adjust

for

maxi-

T2

tor

through

a

dummy

(400Hz,

30%,

AM

{minimum

mum

output

on

If

to

the

antenna

socket

modulated)

inductance)

speaker

voice

coil

(SO1)

Ground

lead

to

lugs.

the

receiver

chassis.

(Refer

to

Figure

8.)

IF

Repeat

until

no

further

improvement

can

be

made.

Same

as

step

1.

Exactly

510kHz.

Low

end

of

dial

(maximum

Same

as

step

1.

R

IS

PF

|

TO

EXT.

ANTENNA

SOCKET.

R=80-Z

(ohm)

IMPEDANCE

OF

65PF

Z

=

OUTPUT

SIGNAL

GENERATOR

Adjust

the

MW

oscillator

(400Hz,

30%,

AM..

coil

L5.

modulated)

inductance}

-

ume

C

eel

‘

Same

as

step

1.

Exactly

1650kHz

High

end

of

dial

|

Sameas

step

1.

Adjust

the

MW

oscillator

ree

(400Hz,

30%,

AM

|

(minimum

trimmer

TCS.

_

modulated)

inductance)

Same

as

step

1.

Exactly

1400kHz

1400kHz.

Same

as

step

1.

Adjust

the

MW

antenna

.

:

(400Hz,

30%

AM

trimmer

TC1,

and

then

Tracking

modulated)

adjust

the

MW

RF

trimmer

TC3.

Mw

Repeat

steps

3

and

4

until

no

further

improvement

can

be

made.

Su

——____j—_______|

Same

as

step

1.

Exactly

145kHz

l.ow

end

of

dial

|

Same

as

step

1.

Adjust

the

LW

oscillator

400Hz,

30%,

A

(maximum

trimmer

TC4

modulated)

inductance)

1

6

LW

ed

,

Same

as

step

1.

Exactly

310kHz

High

end

of

dial

|

Same

as

step

1.

Adjust

the

LW

oscillator

?

|

(400Hz,

30%,

A

(rninimum

coil

L4.

Momodulated

inductance)

|

Same

as

step

1.

Exactly

260kHz

260k

tz.

Same

as

step

1.

Adjust

the

LW

antenna

7

LW

Tracking

400Hz,

30%,

AM

coil

L2,

and

then

adjust

moduleted}

the

LW

RF

coil

L3.

8

LW

Repeat

steps

6

and

7

until

no

further

improvement

can

be

made.

—_——_—_—_—=

TO

CHASSIS

GROUND.

Figure

8

AM

DUMMY

Set

the

band

selector

switch

at

“FM

position.

Quar-

drature

Detector

FM

ALIGNMENT

CHART

SIGNAL

GENERATOR

CONNECTION

TO

RECEIVER

Connect

signal

generator

through

a

.O22MFD

capacitor

to

antenna

socket

(SO1).

Connect

generator

ground

lead

to

the

receiver

chassis.

Same

as

step

1.

Band

Coverage

Connect

signal.

generator

through

a-dummy

including

output

impedance

of

signal

generator

to

the

car

antenna

socket

(SO1).

Ground

lead

of

generator

chassis.

(Refer

to

Figure

9.)

INPUT

SIGNAL

FREQUENCY

DIAL

SETTING

Exactly

10.7MHz

|

Lowend

of

dial.

(400Hz,

30%,

FM

(maximum

modulated)

inductance)

Exactly

10.7MHz

epi.

(unmodul{ated)

Soine

3

ste

RECEIVER

REMARKS

Connect

VTVM

between

test

point

TP1

and

chassis

ground.

See

NOTE

A.

ADJUSTMENT

Tune

IFT

1

(Front

End)

See

NOTE

A.

Repeat

steps

1

until

no

further

improvement

can

be

made.

Exactly

87.2

MHz

{400Hz,

30%,

FM

Same

as

step

1.

modulated)

Adjust

for

maximum

output

at

speaker

voice

coil.

1)

Connect

VTVM

(10

volt

range

D.C.

Scale

between

test

point

TP2

and

(3)

of

IC-1.

2)

Adjust

T1

for

O

volt

on

VTVM.

[ore

ce

R2

~Y)

Rl

To

ANTENNA

SOCKET

Z=75(ohm)

res

Z=50

(ohm)

<

TO

GROUND

Z=OUTPUT

IMPEDANCE

OF

SIGNAL

GENERATOR

Figure

9

FM

DUMMY

|=

37.5

(ohm)

‘R2=

75

(ohm)

Ri=

50

(ohm)

R2=50

(ohm)

Oscillator

trimmer

TC2

(Included

by

|

Front

éndy

Five

kinds

of

ceramic

filter

(CF1,

CF2)

are

available

for

this

set.

The

difference

of

central

frequency

from

each

other

can

be

known

by

the

color

indication.

The

table

below

shows

such

a.

difference

of

IF

and

S

curve,

depending

upon

the

color

indications

of

the

ceramic

filter

(CF

1,

CF2).

|

Black

|

8

|

Blue

|

10.67MHz

+

30kHz

_|

fotA

|

Red

|

10.70MHz

+

30kHz

|

Central

©

Frequency

For

their

employment,

it

is

required

to

use

two

ceramic

filters

of

same

type.

Figure

10—1

FM

STEREO

AND

SEPARATION

ALIGNMENT

Set

the

band

selector

switch

at

“’FM’’

position.

SIGNAL

GENERATOR

:

RECEIVER

STEP

|

CONNECTION

TO

INPUT

SIGNAL

DIAL

RECEIVER

FREQUENCY

SETTING

98MHz

Adjust

so

that

the

fre-

Connect

the

frequency

VR3

quency

becomes

19.0kHz.|

counter

(or

oscilloscope)

(In

case

an

oscilloscope

is

|

through

a

100K

ohm

i

connected

to

the

test

resistor

to

TP10

(3

point

TP10,

adjust

the

of

IC3).

signals

to

be

19kHz

by

using

Lissajou’s

wave-

form).

FM

Signal

generator

Same

as

The

VR2

should

be

ad-

Same

as

step

1.

98MHz

step

1.

(External

modulator)

FM

Stereo

modulator

Pilot:

9%

;

(6.75kHz

dev.)

Signal:

400Hz,

91%

;

(68.25kHz

dev.)

justed

so

that

the

output

Repeat

steps

1

and

2

until

no

further

improvement

can

be

made.

METER

CONNECTION

ADJUSTMENT

Refer

to

Figure

10—2.

level

L

(or

R)

of

the

speaker

might

come

to

be

lowest

by

generating

the

output

signal

of

the

FM

stereo

modulator

on

Right

side

{or

Left

side)

only.

If

without

the

frequency

counter,

proceed

with

the

alignment

as

follows.

While

receiving

an

FM

stereo

signal,

turn

the

VR3

until

the

P.L.L.

will

be

locked

(when

it

is

locked,

the

stereo

indicator

will

be

lit).

Then,

reversely

turn

the

VR3

halfway

and

fix

it.

FM

SIGNAL

SPEAKER

GENERATOR

TERMINAL

SET

FM

stereo

Modulator

°0

ANTENNA

(See

Figure

9.)

Figure

10—2

—~10—

Ae

ost

seeeea

tT)

ANSS

ADJUSTMENT

.

Set

the

band

selector

switch

at

‘’FM”

position.

.

Apply

a

19

kHz

signal

of

30

mV

to

(TP6).

Connect

a

VTVM

and/or

an

oscilloscope

to

(TPQ).

.

Adjust

L10

for

minimum

output

at-

(TPQ).

.

Then,

apply

a1

kHz

signal

of

100

mV

to

(TP6).

NOOR

WN

=

Make

sure

that

there

is

no

output

at

6,

applying

a

100

kHz

signal

of

50

mV

further

to

13.

Next,

make

sure

that

a

1

kHz

signal

of

100

mV

appears

at

(TP6),

connecting

(TP-8)

to

earth.

THE

INSTRUCTION

OF

FREQUENCY

ADJUSTMENT

In

order

to

comply

with

Pfg.

Nr.

358/1970,

please

fix

the

low

end

of

dial

frequency

(87.5MHz)

and

the

high

end

of

dial

frequency

(107.9

MHz}

on

FM

band,

by

adjusting

Oscillation

trimmer

oscillation

coil

(L4),

(Included

by

front-end)

respectively,

as

itlustrated

in

Figure

7.

MUTING

CURVE

ADJUSTMENT

(Fig.

11—1

and

11—2)

1.

Place

the

set

in

FM

mode.

2.

Set

FM

signal

generator

to

produce

a

signal

of

98

MHz

{modulated

at

22.5

kHz),

54

dB,

and

connect

this

signal

to

the

antenna

terminal

of

the

set.

3.

Tune

in

the

signal

of

98

MHz,

and

adjust

the

Volume

control

so

that

the

speaker

output

becomes

1.4

V

on

VTVM

(across

a

resistor

of

4

ohms).

(Balance

control:

Mechanical

center).

4.

Set

FM

signal

generator

to

produce

a

signal

of

98

MHz

‘(modulated

at

22.5

kHz),

20

dB,

and

tune

in

this

signal.

5.

Adjust

the

semi-variable

resistor

VR1

so

that

the

speaker

output

becomes

1V

on

VTVM

(across

a

resistor

of

4

ohms).

FM.

SIGNAL

GENERATOR

ATTENUATOR

.

ANTENNA

SPEAKER

OUTPUT

LEVEL

{

°

10

20

30

40

mm

(dB)

SG

OUTPUT

LEVEL,

Figure

11—1

(SG

Output

vs

Speaker

Output)

SPEAKER

OUTPUT

)

a

GND

98

MHz,

22.5

kHz

54

dB

>

200dB

Figure

11-2

—-Ti—

(oa

Ql

4P

o

=

R1

LI

680

/

©)

2

La

ae

~é

/

Qi.

|

/

Q2.

/

Q3.

/

AM

BLOCK

bet

ease

2

A

eee

a

7

Ot)

-_

|

\

/

=

(3)

/

|

{

/

ca

eet

ty

ge

al

22P

/

/"Fc3

cs

30P

24P

|

02

ie

o

R4

aoe.

ce

eM

OR

EQUAL

Q)

ned

o

ror

i

Ge

EouAt

oe

538

Bg

cié6

i

L4

DB

02

=

cl4

16

2SCI675

R3

cil

/[

tc2

ap

OR

EQUIAL

OR

EQUAL

5.6K

ioP

/

FM

FRONT

END

1:

ANT

(75

ohm)

2:8

(8.2V)

3

:

OUT

(300

ohm)

4:E

5:

AFC

Note:

The

FM

Front

End

and

AM

Block

tuner

unit

shown

above

is

supplied

as

an

assembly

unit

and

to

supply

its

constituent

parts

separatory

is

not

possible.

~12—

Sharp RG-7050E Manuale utente

Manuali Ricevitore per auto popolari di altre marche