Panasonic SG-5090 Manual de usuario

ORDER

NO.

TSD-7808-321

Service

Manual

Compact

Stereo

FM/AM/FM

STEREO

RADIO

WITH

“SENSOR

TOUCH”

PRESET TUNING

SYSTEM,

5O90/

DOLBY*

NOISE

REDUCTION

SYSTEM,

(M)

CASSETTE

TAPE

DECK

AND

RECORD

PLAYER

Specifications

[GERMANY

AMPLIFIER

SECTION

Power

Output.

_—

fe}

fle)

One

Channe!

Driven

One

rel

)

RMS

30W

1%,

ohms)

Both

Channel.

Driven.

200

mV,

60k

IN:

380

TAPE

DECK

SECTION

45d

SW:

20d

RECORD

PLAYER

SECTION

44.

Player

System

Turnta

(

Turntab

and

POWER

CONSUMPTION

.....220W

POWER

SUPPLY

raiceae

ONS

soe

for

furt

subject

change

without

National

Panaso

Matsushita

Electric

Trading

Co.,

Ltd.

Box

288,

Cent

aka

Japan

woah

LOCATION

(w)/060S-9S

—

SG-5090/(m)

DISASSEMBLY

INSTRUCTIONS

Remove

Dust

Cover

Remove

Record

Player

Record

Player

Remove

Knobs

Dust

Cover

Remove

Screws

Vas

Remove

o—

Remove

gor

Remove

Cabinet

........0....0.00

Refer

Remove

Escutcheon.......................0.

Refer

©.

Remove

Tape

Deck......................0....

Refer

©.

SERVICING

AID

Remove

Remote

Wire

Assembly

Lift

remote

wire

assembly

upward

pushing

the

lower

portion

plastic

hook

with

suitable

screwdriver.

Rempve

Note

for

Handling

Remote

Wire

Assembly

When

servicing

remote

wire

assembly,

sure

hold

gently.

not

bend

sharply.

Before

lifting

the

cassette

deck

(or

circuit

board),

sure

remove

remote

wire

assembly

carefully

prevent

from

being

damaged.

Not

Bend

peice

———

eee

Good

SG-5090/(m)

ALIGNMENT

INSTRUCTIONS

(RADIO)—1

Alignment

Control

Positions:

DUMMY

ANTENNA

wae

Tey,

ON.

SOO

OND

OPO

Volume

Control

Treble

Control

Bass

Control

Balance

Control

Function

Selector...

Power

Switch

Preset....

Loudness

High

Filter

Selector...

Muting

Switch

Preset

Volume

(VR101~

Maximum

(AM-IF

and

RF,

FM-RF);

Minimum

(FM-IF)

LW,

MW,

SW,

MONO

and

AUTO

MANUAL,

P1,

P2,

P3, P4,

and

P6.

them

fully

counterclockwise.

Preset

Volume

(VR108~VR112)

reading.

(or

use

dummy

load

resistors.)

VR106)...

Turn

set

the

center

point.

Output

signal

generator

should

higher

than

necessary

obtain

output

Make

certain

that

speaker

system

connected

the

receiver

when

aligning.

SSG

(Imp.

75Q)

Receiver

DUMMY

ANTENNA

302

20uH

125pF

SSG

3202

400pF

Receiver

SIGNAL

GENERATOR

SWEEP

GENERATOR

CONNECTION

FREQUENCY

RADIO

DIAL

SETTING

INDICATOR

(VTVM

SCOPE)

ADJUST

REMARKS

AM-IF

AND

ALIGNMENT

Fashion

loop

several

turns

wire

and

radiate

signal

into

loop

receiver.

455

kHz

30%

Mod.

with

400

Point

non-

interference

(on/about

600

kHz)

145

kHz

30%

Mod.

with

400

350

kHz

30%

Mod.

with

400

145

kHz

(15.44

mm)

350

kHz

(201.13

mm)

550

kHz

30%

Mod.

with

400

550

kHz

(21.83

mm)

1500

kHz

30%

Mod.

with

400

1500

kHz

(196.72

mm)

Connect

EXT.

antenna

and

ground

through

Dummy

antenna.

SG-5090/(m)

5.9

MHz

30%

Mod.

with

400

5.9

MHz

(15.64

mm)

MHz

30%

Mod.

with

400

MHz

(172.30

mm)

Output

meter

across

speaker

jack

(L).

(Imp.

42)

T201

(AM

1st

IFT)

T202

(AM

CFT)

T203

(AM

DET)

Adjust

for

maximum

output.

L202

(LW

ANT

Coil)

L205

(LW

OSC

Coil)

CT202

(LW

ANT

Trimmer)

CT205

(LW

OSC

Trimmer)

Adjust

for

maximum

output

sliding

coil

L202

along

ferrite

core.

Adjust

for

maximum

output.

Honest

steps

(2)

and

(3).

L201

(MW

ANT

Coil)

L204

(MW

OSC

Coil)

Adjust

for

maximum

output

sliding

coil

L201

along

ferrite

core.

CT201

(MW

ANT

immer)

CT204

(MW

OSC

Trimmer)

Adjust

for

maximum

output.

Repeat

steps

(4)

and

(5).

L203

(SW

ANT

Coil)

L206

(SW

OSC

Coil)

Adjust

for

maximum

output.

C7203

(SW

ANT

Trimmer)

CT206

(SW

OSC

Trimmer)

Adjust

for

maximum

output.

Repeat

steps

(6)

and

(7).

NTS

(RADIO)

ALIGNMENT

POi

D °

neter

AND

ALIGNMENT

FM-IF

IENT

INSTRUCTIONS

(RADIO)—2

iba

aligned.

not

touch

drift

pre-

ignment

fe:

When

aligning

separation,

disconnect

frequency

counter.

ALIGNMENT

INSTRUCTIONS

(TAPE

DECK)

Tape

Deck

Alignment

CGontrol

Kae

Seg

ATARI

VTVM

CONN

he)

Aine

aera

eon

Positive

efeat

defeat

swi

SER

Eee

[vests

sea

betic

Connect

TP801

Turn

Dolby

switch

———|

REC/PLAY

term

yea

(OQmark

eae

YRA08”

and

VR408

for

0.6

Notes:

not

touch

R/P

Head

and

Erase

Head when

aligning.

L801

and

L802

are

pre-aligned.

not

touch

them.

MTT-150

DOLBY

LEVEL

calibration

tape.

acesrrsnseenemneninnentansneumntonnsestettnnenaensarenen

ents

Pere

uncnenso

sescmnmannorcn

rte

nnn

ements

__t

RECORD/PLAYBACK

HEAD

AZIMUTH

ADJUSTMENT

Playback

Standard

Alignment

Tap

and

turn

Azimuth

Adjusting

Screw

for

maximum

loudn

ess.

es)

Test

Tape

(6.3

kHz)

VTT-652

orEquivailent

$G-5090\m)

[7]

SG-5090/(m)

MECHANICAL

ADJUSTMENT

CASSETTE

TAPE

DECK

PRESSURE

ROLLER

ADJUSTMENT

Switch

set

PLAY.

(Do

not

insert

cassette.)

Hook

gauge

arm

pressure

roller.

Pressure

Roller

Capstan

Pull

pressure

roller

away

from

the

capstan

the

direction

arrow

with

spring

gauge

and

slowly

permit

the

pressure

roller

return

toward

capstan

inthe

direction

arrow

Measure

tension

time

when

pressure

roller

makes

contact

with

capstan

(or

when

pressure

roller

starts

rotating.)

The

standard

tension

pressure

roller

should

250

380g.

pressure

not

within

these

limits;

Clean

the

rubber

roller

and

capstan

with

soft

cloth

moistened

with

alcohol

replace

pressure

spring.

TAKE-UP

TORQUE

ADJUSTMENT

f&ONM-

Test

Tape:

QZZSRK-CT

(Take-up

Torque

Meter)

Insert

test

tape.

Rewind

the

tape

its

starting

point.

Switch

set

PLAY.

Read

‘®”

mark

indicator

take-up

side.

Indicator

CASSETTE

TORQUE

METER

QZZSRK-CT

Torque

Scale

Repeat

PLAY-STOP

several

times

and

read

the

average

tension.

The

standard

take-up

tension

should

g.cm.

take-up

tension

not

within

these

limits;

Clean

main

belt,

take-up

reel

and

all

parts

which

contact

them

with

cotton

swab

moistened

with

alcohol,

and/or

Switch

set

“OFF”,

remove

main

belt

and

make

sure

that

take-up

reel

and

take-up

clutch

are

rotating

smoothly.

Change

take-up

clutch

tension

turning

the

friction

spring

under

reel

table,

and/or

Replace

take-up

clutch.

Friction

Spring

Take-up

Clutch

Assembly

MOTOR

PULLEY

ADJUSTMENT

When

replacing

the

motor,

adjust

the

clearance

between

motor

and

motor

pulley

figure

below.

$¢-5090/(m)

SERVICING

THE

RECORD

PLAYER

CARTRIDGE

REPLACEMENT

Remove

the

headshell

fixing

nut

turning

clockwise

and

remove

headshell

from

pickup

arm.

Remove

cartridge

from

headshell

removing

the

two

screws

and

disconnecting

the

lead

wires

from

cartridge.

Using

the

two

nuts

attached,

mount

new

cartridge

onto

headshell

that

the

cartridge

perpen-

dicular

the

disc

surface.

Install

headshell

pickup

arm.

Note:

Correct

stylus

position

can

obtained

relocating

the

cartridge.

Screws

Stylus

Setting

Position

hes

ie)

——-

Nuts

STYLUS

REPLACEMENT

Lift

pickup

arm

position

that

will

make

the

stylus

accessible.

Gently

remove

worn

stylus

and

replace

with

new

one.

STYLUS

PRESSURE

ADJUSTMENT

Release

pickup

arm

from

its

seated

position.

Place

record

the

turntable.

Then,

balance

the

pickup

arm

turning

out

the

balance

weight

until

the

stylus

leveled

the

surface

the

record

(as

viewed

from

the

turntable

unit

side).

SG-5090/m)

Set

the

stylus

pressure

dial

“0”,

and

since

the

specified

stylus

pressure

the

cartridge

2.0

grams,

set

the

balance

weight

dial

“2”

turning

the

weight

counterclockwise

(as

viewed

from

the

front

panel

side).

Tone

Arm

Ass'y

—-———-Balance

Weight

LUBRICATION

The

record

player

has

been

thoroughly

lubricated

the

factory

and

under

normal

use

should

not

required

additional

lubrication.

When

replacing

some

parts,

however,

may

necessary

lubricate

the

parts

specified.

Note:

not

allow

grease

touch

motor

pulley,

pelt

and

turntable.

Grease

DOLBY

NOISE

REDUCTION

SYSTEM—1

GENERAL

DESCRIPTION

The

Dolby

B-Type

Noise

Reduction

System

used

this

equipment.

reduces

the

level

background

noise,

normally

introduced

during

tape

recordings

without

changing

the

frequency

response

the

audio

signal.

METHOD

DOLBY

SYSTEM

Signal

deviation

Dolby

System

shown

Fig.

shows

the

Record

(Encoding)

and

Playback

(Decoding)

characteristics

for

signal

about

kHz

different

signal

levels.

For

example,

following

level

Fig.

When

—30

REC

signal

applied.

boosted

~—20

and

recorded

magnetic

tape.

[ENCODED

COMPRESSED]

Playing

back

this

recorded

tape

(at

—20

dB).

The

output

signal

attenuated

the

Dolby

System

and

reproduced

—30

dB,

the

same

level

recorded.

[DECODED

EXPANDED]

Dolby

Level

aah

Sae

OUTPUT

LEVEL

(dB)

20 10

+10

INPUT

LEVEL

(dB)

FIG.

Tape

DOLBY

ENCODER

REC

PRE

AMP

(Rec)

Rec

Signal

Input

RPH

(Play)

REC RPH

PRE

AMP

(Red)

Fig.

shows

the

boosting

characteristics

the

fre-

quencies

for

different

signal

levels.

GAIN

(dB)

is}

TEN

DUAL

HEED

0.1

FREQUENCY

(kHz)

FIG.

Fig.

shows

the

general

boosting

vs.

attenuation

Characteristics

for

record

and

playback

with

the

resulting

overall

Record

Playback

response.

The

point

which

the

Record

and

Playback

curve

flattens

out

the

level

and

called

the

Dolby

Level.

The

Dolby

level

corresponds

level

which

the

magnetic

flux

density

the

signal

recorded

tape

200

pwb/mm

and

indicated

the

meter

this

unit.

GAIN

(dB)

FREQUENCY

(kHz)

FIG.

DOLBY

PLAYBACK],

InECODER

MAIN

eee

PRE

AMP

(Play)

AMP

DOLBY

NOISE

REDUCTION

SYSTEM—2

PRINCIPLE

NOISE

REDUCTION

Much

the

audible

noise

hiss

noise

the

medium

and

high

frequencies

created

during

the

recording

process

magnetic

tape,

while

some

the

noise

playback

amplifier

noise.

high

input

levels

the

noise

suppressed,

however,

low

input

signal

levels

the

Signal

Noise

Ratio

(S/N)

decreases

and

the

noise

heard.

The

Dolby

System

this

unit

designed

solve

this

problem

boosting

the

low

level

mid

and

high

fre-

quencies

about

during

recording

(com-

pressing)

and

attenuating

(expanding)

the

same

signals

during

playback

equal

amount,

shown

Fig.

The

amount

boost/attenuation

depends

the

level

and

the

frequency

the

signal.

Fig.

shows

the

noise

reduction

with

Dolby

“IN”

vs.

Dolby

“OUT”.

DOLBY

OUT

Approx

—

DOLBY

NOISE

LEVEL

100

10k

FIG.

CIRCUIT

OPERATION

The

operation

the

Noise

Reduction

System

shown

the

Block

Diagram

Fig.

turning

the

Rec/Play

switch

Record

Play

and

the

Dolby

In/Out

switch

this

circuit

operates

either

the

Encode

Decode

mode,

follows:

[ENCODE]:

ST3,

ST7,

ST11

and

ST9

RECORD

position.

The

recording

signal

applied

the

REC

AMP

and

passes

through

AMP

“A”

the

Dolby

and

the

low-

pass-filter

(LPF),

and

enters

AMP

“B”

the

LPF

attenuates

unwanted

frequencies

such

tape

recorder

bias

MPX

sub.

carrier

signals

the

level

which

will

not

influence

the

Dolby

circuit

operation.

The

out-

put

signal

AMP

“B”

divided

into

two

paths;

one

directly

supplied

ADDER

“E”,

and

called

direct

signal,

while

the

other

controls

the

noise

reduction

signal.

This

signal,

passing

through

ST9,

S801-3,

high-

pass-filter

(HPF),

variable

resistance

‘“F”

and

AMP

“C”,

enters

ADDER

“E”

and

increases

the

direct

signal.

result

the

REC

signal

from

INVERTER

“K”

boosted.

[DECODE]:

Essentially

the

same

circuitry.

ST3,

ST7,

ST11

and

ST9

PLAY

posi-

tion.

The

playback

signal

from

the

playback

head

(RPH)

applied

PLAYBACK

PRE

AMP

and

passes

through

ST7,

AMP

“A”

the

Dolby

IC,

“LPF”

and

AMP

“B”,

and

then

enters

ADDER

“E”

the

direct

signal.

One

part

output

signal

from

INVERTER

“kK”,

passing

through

ST8,

supplied

the

MAIN

AMP,

and

the

other,

Noise

Reduction

Signal,

passes

through

$801-3,

“HPF”.

Variable

Resistance

“F”

and

AMP

“C”,

are

applied

ADDER

“E”

opposite

phase.

result,

the

level

the

playback

signal

attenuated.

This

circuit

operates

boost

REC

position

[ENCODE]

and

attenuate

PLAY

position

[DECODE].

“G”

the

rectifying

and

smoothing

circuit

Noise

Reduction

Signal

and

controls

Variable

Resistance

“F’,

And

“F”

and

“HPF”

compose

the

dynamic

high

pass

filter,

and

control

the

boosting

and

attenuating

degree

high

and

medium

frequency

response

the

signal

level

(Fig.

and

Fig.

3).

‘“T”

the

circuit

set-

ting

the

response

time

Dolby.

[rv

80l

L803

DOLBY

TYPE

INTEGRATED

CIRCUIT

RBIS

(6)

INVERTER

NE646B

ca37t

lev

10070

(4)

sT7

Rel7

cals

Flov

pray

Back

“La

aRee

(9)

PRE

AMP

RPH

O00

are

C835

R8IZ

35V

0.68

High

Level

Signal

——

—Wu

WrWu

earner

ADAG

—10

—20

Wu"

Low

Level

Signal

——

dB———=""_

High

Level

Signal

——~

——=

Low

Level

Signal

—40

Tape

Noise

www

—e

www

—50

wewew

Tape

Noise

(DOLBY

OUT)

www:

—.

—

———a=»

Wawwww

Tape

Noise

(DOLBY

IN)

FIG.

SG-5090/(m)

O=—D—O—)

rae

gay

—?

Val

tats

Sign

Play

R423

Rep

R825

|R827

tlt

Ree

Vea

Sse

Slonal

tr4

IRgig

20K

VR403

Play

Rel

13.3K2

ogo)

-ca2sze

10K

Eee?

ajoopT

831]!

C833]!

33)

fat

C829

LE--~L--~

rig

0.097,

35V|35vo,

Dolby

level

REC

Vegis

eae

mee

oO!

Adjust

LPF

cen3!5600°

230

STil

184

—T

R447

Play[

Rec

REC

AMP

47K

METER

R449

O09

MIC

AMP

4.7K

‘i

MAIN

AMP

SG-5090/(m)

“SENSOR”

TOUCH

PRESET

TUNING

SYSTEM

GENERAL

DESCRIPTION

The

“Sensor

Touch”

Preset

Tuning

System

the

equipment

designed

for

easy

soft

touch

selection

six

stations.

This

system

composed

electronic

tuning

circuit

equipped

with

varactor

diodes

and

sensing

driver

cir-

cuit

using

two

integrated

circuits,

|C101

SN94041

and

IC102

SN94042.

CIRCUIT

OPERATION

The

operation

“Sensor

Touch”

Preset

Tuning

System.

iC101

SN94041

operates

select

the

station

for

MANUAL,

and

P2,

and

1C102

SN94042

for

P4,

When

the

sensor

button

touched

with

finger,

the

detecting

circuit

operates

energize

LED

driver

and

channel

out

circuit

and

then

LED

lights.

While

applying

voltage

that

adjusted

VR101

the

varactor

diode

the

electronic

tuning

circuit,

the

station

selected.

Muting

circuit

enables

decrease

selection

noise

when

selecting

channels,

flowing

the

signal

from

No.

101

Q101.

Hold

circuit

and

reset

circuit

are

provided

lock

the

selected

station

when

releasing

the

finger.

Initial

Set

circuit

C101

operates

tune

the

station

turned

again

after

turning

OFF.

VR111

P5,

and

P7.

TUNER

1c101

P41

o-#b

O-

[LED

Driver

MANUAL

sen.

[Hoi

tse

ene]

ale

Sen

Hold

aaa

lea

vacant,

Terminal

(8)

WANUAL

VA)

VRTOF

ahah

VR107

Vacant

(

—|

Channel

Out

)

Terminal

SG-5090/(m)

[cetO-

LED

Driver

[feb

aby

VR108

4153

(y/

jy’

©)

”

moet

[Tn

OPE

DIAL

METER

One

Shot

Multivibrator

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