Sony ST-88 Manual de usuario

Tuner

Section

Tuning

range:

Antenna:

Intermediate

frequency:

Usable

sensitivity:

S/N

ratio:

Capture

ratio:

Selectivity:

Image

rejection:

Spurious

rejection:

A-m

suppression:

Frequency

response:

Harmonic

distortion:

Stereo

separation:

A-m

Tuner

Section

Tuning

range:

Antenna:

STEREO

TUNEN

$T-80

enn,

SPECIFICATIONS

87.5

108

MHz

300

ohms

balanced

10.7

MHz

2.2

(IHF)

1.7

(S/N

dB)

2.5

(IHF)

kHz

Mono;

0.5

400

100

Mod.

Stereo;

0.8

400

100

Mod.

greater

than

400

530

1,605

kHz

Built-in

bar

antenna

with

external

antenna

provision

Intermediate

frequency:

Sensitivity:

kHz,

kHz

suppression:

S/N

ratio:

Image

rejection:

\-f

rejection:

Harmonic

distortion:

General

Power

requirements:

Power

consumption:

Dimensions:

Net

weight:

Shipping

weight:

AEP,

and

USA

Model

STEREO/

FM-AM

TUNER

455

kHz

(USA

and

AEP

Model)

468

kHz

(UK

Model)

dB/m,

built-in

antenna

100

LV,

external

antenna

1,000

kHz

45 dB

1,400

kHz

1,000

kHz

0.8

120

(USA

Model)

110,

127,

220,

240

50/60

(AEP

and

Model)

10W

128

(w)

232

(h)

210

(d)

516

(w)

94g

(h)

(d)

inches

approx.

2.7

oz)

approx.

3.2

oz)

SONY.

SERVICE

MANUAL

pte

Section

TABLE

CONTENTS

Title

Page

TECHNICAL

DESCRIPTION

1-1.

Block

Diagram

2...

eee

DISASSEMBLY

AND

REPLACEMENT

2-1.

Wooden

Case

Removal...

2-2

eee

eet

ets

9-2.

Front

Panel

Removal...

2...

eee

ere

9-3.

Front

Subchassis

Removal...

eee

2-4.

(A-m)

Front-End/I-f

Amp/MPX

and

Preamplifier

Board

Removal...

eee

ett

7-5.

Power

Supply

Board

Removal

....--

eee

setts

9.6.

Dial

Cord

Restringing

©...

eee

9-7.

DialLamp

Replacement

...-.

eee

rete

ttre

2-8.

Tuner

Input

Meter

Replacement...

+--+

eee

eet

2-9,

Band,

Mode,

Afc

and

Power

Switch

Replacement

...--

+--+

--:

9-10.

Chassis

Layout...

ALIGNMENT

AND

ADJUSTMENT

3-1.

I-f

and

Discriminator

Alignment

....-

+--+

eee

rrrrcs

3-2.

Frequency

Coverage

and

Tracking

Alignment

.....----:5

3-3.

Stereo

Separation

Adjustment...

eee

tts

3-4,

A-mI-f

Strip

Alignment

2...

ree

3-5.

A-m

Frequency

Coverage

and

Tracking

Alignment

.....--+---

REPACKING......--

+++

ee e5

DIAGRAMS

5-1.

Mounting

Diagram

—

Power

Supply

and

Attenuator

Boards

.....

5-2.

Mounting

Diagram

—

(A-m)

Front-End/I-f

Amp/MPX

and

Preamplifier

Board...

+--+

eee

rrr

tts

5-3,

SchematicDiagram....----

eee

ett

EXPLODED

VIEWS...

...----

etree

teers

ELECTRICAL

PARTS

LIST

.....---

22s

errr

(Ooty

SECTION

TECHNICAL

DESCRIPTION

BLOCK

DIAGRAM

1-1.

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(Z08s)

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SECTION

DISASSEMBLY

AND

REPLACEMENT

Note:

All

screws

this

service

manual

are

Phillips

type

(cross

recess),

unless

other-

wise

specified.

(—):

slotted

head

2-1.

WOODEN

CASE

REMOVAL

Remove

the

four

screws

16)

securing

the

wooden

case

the

chassis

along

with

the

rubber

feet.

Remove

the

two

screws

shown

Fig.

2-1.

mee

ANT

;

GRouaD

[Ts00s

)

Fig.

2-1.

Wooden

case

removal

;

hee

ats

2-2.

FRONT

PANEL

REMOVAL

Remove

the

wooden

case

described

Procedure

2-1.

Pull

out

the

tuning

knob.

Remove

the

four

screws

securing

the

front

panel

the

chassis

shown

Fig.

2-2.

Remove

the

front

panel

the

arrow

direction

shown

Fig.

2-3.

Unsolder

the

two

lead

wires

from

the

TUNER

INPUT

meter

and

pull

out

the

lamp

socket

from

the

TUNER

INPUT

meter

bracket

shown

Fig.

2-3.

FRONT

SUBCHASSIS

REMOVAL

Remove

the

wooden

case

and

the

front

panel

described

Procedures

2-1

and

2-2.

Remove

the

nine

screws

(

(A)

)

shown

Fig.

2-4

and

Fig.

2-5.

Pull

off

the

STEREO

lamp

from

the

grommet.

;

Fig.

2-4.

Front

subchassis

removal

«oy

Fig.

2-5.

Front

subchassis

removal

(2)

2-4.

(A-M)

FRONT-END/I-F

AMP/MPX

AND

PREAMPLIFIER

BOARD

REMOVAL

Remove

the

wooden

case

described

Procedure

2-1.

Unsolder

the

ribbon

antenna

the

(a-m)

front-

end/i-f

amp/MPX

and

preamplifier

board

shown

Fig.

2-6.

Remove

the

rear

panel

the

arrow

direction

loosening

the

three

screws

(

)

shown

Fig.

2-6.

Loosen

the

two

screws

(

®))

shown

Fig,

2-4,

antenna,

(a-m)

front-end/

i-f

amp/MPX

and

_”

preamplifier

board

Fig.

2-6.

(a-m)

front-end/j-f

amp/MPX

and

preamplifier

board

removal

Remove

the

two

screws

(B))

shown

Fig.

2-5.

Carefully

remove

the

board

from

the

chassis

taking

care

not

break

the

lead

wires.

2-5.

POWER

SUPPLY

BOARD

REMOVAL

Remove

the

wooden

case

described

Procedure

2-1.

Unsolder

the

three

lead

wires

(red,

white

and

black)

connecting

the

power

supply

board

and

the

(a-m)

front-end/i-f

amp/MPX

and

preamplifier

board.

Unsolder

the

ribbon

antenna

shown

Fig.

2-6.

Loosen

the

three

screws

(

©)

shown

Fig.

2-6.

Carefully

open

the

rear

panel

the

arrow

direction

shown

Fig.

2-6

taking

care

not

break

the

lead

wires,

Remove

the

two

screws

securing

the

power

supply

board.

2-6.

DIAL

CORD

RESTRINGING

10.

11.

Remove

the

wooden

case,

front

panel

and

front

subchassis

described

Procedures

2-1,

2-2

and

2-3.

Make

loop

the

dial

cord

shown

Fig.

2-7.

Make

knot

and

hook

spring

to.

the

dial

cord

and

then

fasten

the

knot

shown

Fig.

2-8.

Loosen

the

two

screws

securing

the

dial

scale

ass’y

the

tuning

drum

shaft

and

remove

the

dial

scale

ass’y.

Hook

the

spring

the tab

the

dial

scale

ass’y

and

string

the

dial

cord

around

the

dial

scale

ass’y

and

the

tuning

shaft

numerical

order

shown

Fig.

2-9

and

2-10.

Install

the

dial

scale

ass’y

the

tuning

drum

shaft

and

fix

dial

scale

set

screw

temporarily.

Set

the

AFC

switch

OFF.

Tune

the

set

the

local

station

turning

the

tuning

shaft.

Loosen

the

dial

scale

set

screw

and

turn

the

dial

scale

ass’y

the

position

where

the

pointer

the

dial

front

glass

indicates

the

local

station’s

carrier

frequency.

Fix

the

two

dial

scale

set

screws.

Make

sure

that

the

correct

dial

calibration

also

done

a-m

mode.

dial

cord

317

(1242)

hot

0.3

(

Yea)

dia.

Fig.

2-7.

Dial

cord

the

dial

cord.

Fig.

2-8.

Finish

point

dial

cord

dial

cord

dial

scale

ass‘y

yvatt

two

turns

Fig.

2-10.

Dial

cord

restringing

(Front

View)

2-7.

DIAL

LAMP

REPLACEMENT

Remove

the

wooden

case

and

front

panel

described

Procedures

2-1

and

2-2.

Slide

the

lamp

socket

forward

permit

removal

lamp

shown

Fig.

2-11.

Unscrew

the

lamp

from

the

socket

and

install

new

one

and

push

the

socket

back

its

original

place.

Fig.

2-11.

Dial

lamp

removal

2-8.

TUNER

INPUT

METER

REPLACEMENT

Remove

the

wooden

case

and

front

panel

described

Procedures

2-1

and

2-2.

Unsolder

the

two

lead

wires

and

remove

the

two

screws

shown

Fig.

2-12.

Install

new

one.

2-9.

BAND,

MODE,

AFC

AND

POWER

WwW

SWITCH

REPLACEMENT

Remove

the

wooden

case

and

front

panel

described

Procedures

2-1

and

2-2.

Remove

the

two

screws

securing

each

switch

the

chassis

shown

Fig.

2-13.

Unsolder

the

switch

lead

wires.

Install

new

one.

B3x

self-tapping

TUNER

INPUT

meter

B3x6é

self-tapping

TUNER

INPUT

meter

eile

Fig.

2-12.

Tuner

input

meter

replacement

Fig.

2-13.

BAND,

MODE,

AFC

and

POWER

switch

replacement

2-10.

CHASSIS

LAYOUT

a-m

bar

antenna

(a-m]

front-end/i-f

amp/MPX

attenuator

and

preamplifier

board

power

supply

board

power

transformer

Fig.

2-14.

Chassis

layout

SECTION

ALIGNMENT

AND

ADJUSTMENT

3-1.

I-F

AND

DISCRIMINATOR

Simel

oorerster

menos

ALIGNMENT

;

Test

Equipment

Required

CAUTION

Signal

generator

capable

generating

10.7

MHz

The

ceramic

filters

the

i-f

circuit

are

a-m/fm

signal.

selected

according

their

specified

center

fre-

quencies

and

color

coded

shown

Fig.

3-1

Oscilloscope

and

listed

Table

3-1.

Check

the

color

code

Vertical

sensitivity

100

mV/cm

minimum

the

filters

identify

the

same

center

frequency

nae

when

replacing

any

these

filters.

VIVM

Alignment

tools

TABLE

3-1.

I-F

CERAMIC

FILTERS

Preparation:

Part

No.

Color

Specified

Center

Freq.

Connect

the

input

cable

the

oscilloscope

with

Higator

cli

ees

sana

10.70

MHz

alligator

clips

R229

and

ground

the

(a-m)

front-end/i-f

amp/MPX

and

preamplifier

board,

and

ESgeaeee!

pits

tetales

solder

0.02

capacitor

across

these

clips

'/.

1-527-220-3

orange

10.73

MHz

aye

P P

;

1-527-220-41

black

10.64

MHz

Re:

1-527-220-51

white

10.76

MHz

Connect

the

output

cable

the

generator

across

CV102

the

(a-m)

front-end/i-f

amp/MPX

and

preamplifier

board

through

0.02

coupling

capacitor

shown

color

dot

BPR

AMES

AER

Fig.

3-1.

Color

dot

ceramic

filter

;

€

iz)

‘er

fzas

Rel

a-M

osc

trimmer

Fig.

3-2.

Interruption

a-m

local

oscillator

operation

Note:

Local

oscillator

should

killed

when

performing

this

alignment.

stop

the

local

oscillator

operation,

shunt

the

oscil-

lator

capacitor

with

0.02

capacitor

shown

Fig.

3-2.

signal

{

generator

Fig.

3-4.

10.7-MHz

signal

injection

Procedure:

With

the

equipment

connected

shown

Fig.

3-5,

set

the

signal-generator

controls

follows:

Frequency........

Specified

frequency

ceramic

filter.

See

Table

3-1.

Modulation

.......

Fm,

400

Hz,

100

(75

kHz)

Output

level.......

1,000

(60

dB)

Set the

tuner

switches

follows:

BAND

switch......

MODE

switch......

MONO

AFC

switch

.......

OFF

Adjust

the

signal

generator

frequency

slightly

obtain

maximum

output,

and

then

change

the

signal

generator

modulation

a-m,

400

the

discriminator

transformer

IFT201

not

aligned

correctly,

400

ripple

will

observed

shown

Fig.

3-6.

Turn

the

secondary

side

core

(green)

discrimina-

tor

transformer

IFT201

(see

Fig.

3-10)

with

alignment

tool

obtain

minimum

indication

the

oscilloscope

shown

Fig.

3-6.

Fig.

3-6.

discriminator

alignment

output

response

Note:

Turn

the

core

carefully

and

slowly

because

the

output

appearing

the

oscilloscope

jumps

and

down

when

turning

the

core.

This

might

cause

diffi-

culty

determining

the

point

mini-

mum

output.

Also,

both

extreme

positions

the

top

core,

decreased

out-

put

will

observed.

The

real

null

point

should

obtained

the

middle

the

eae

signal

Cv102

generator

OQ-—-__~__—____—__.

R229

core

thread

length,

and

maximum

output

occurs

each

side

the

true

null

point.

Change

the

signal

generator

modulation

fm,

400

100

Turn

the

core

IFT101

and

primary

side

core

(brown)

discriminator

transformer

IFT201

(see

Fig.

3-10)

obtain

the

maximum

output.

3-2.

FREQUENCY

COVERAGE

AND

TRACKING

ALIGNMENT

Note:

Before

starting

this

alignment,

the

i-f

and

discriminator

alignment

should

performed.

Test

Equipment

Required

signal

generator

VTVM

Oscilloscope

Alignment

tools

Preparation:

Connect

the

equipment

shown

Fig.

3-7.

Set

the

tuner

switches

follows:

BAND

switch...

...

MODE

switch.

.....

MONO

AFC

switch...

2...

OFF

Signal

Generator

Method

the

procedures

given

Table

3-2

when

performing

this

alignment

with

signal

generator.

sure

that

the

dial

mechanically

calibrated.

Off-the-Air

Signal

Method

Accurate

dial

calibration,

and

frequency

cover-

age

test

can

also

performed

utilizing

off-the-air

local

signals.

However,

before

performing

the

following

procedure,

sure

that

the

dial

mechani-

cally

calibrated.

oscilloscope

PAA

Fig.

3-5.

Fmi-f

and

discriminator

alignment

test

setup

signal

generator

ST-88

VTVM

oscilloscope

——“-"—

—

signal

ANTENNA

NORMAL

OUTPUT

generator

Jack

(J802)

Fig.

3-7.

frequency

coverage

and

tracking

alignment

test

setup

TABLE

3-2.

FREQUENCY

COVERAGE

AND

TRACKING

ALIGNMENT

Coupling.....

Output

Level

400

Hz,

100

mod;

low

possible

Step

Frequency

Dial

Indication

VTVM

Adjust

Indication

Connection

87.5

MHz

87.5

MHz

NORMAL

OSC

coil

L103

Maximum

OUTPUT

See

Fig.

3-10.

VTIVM

108

MHz

108

MHz

jack

(J802)

FREQUENCY

COVERAGE

ALIGNMENT

reading

OSC

trimmer

CT103

See

Fig.

3-10.

Coupling.....

Direct

Output

Level

400

Hz,

100

mod;

low

possible

TRACKING

ALIGNMENT

87.5

MHz

87.5

MHz

NORMAL

OUTPUT

jack

(J802)

108

MHz

108

MHz

3-3.

STEREO

SEPARATION

ADJUSTMENT

Maximum

VTVM

reading

Antenna

coil

L101

coil

L102

See

Fig.

3-10.

Antenna

trimmer

CT101

trimmer

CT102

See

Fig.

3-10.

Procedure:

Precisely

tune

the

set

the

carrier

frequency

stereo

signal

generator,

then

turn

the

top

core

switching

transformer

L301

(see

Fig.

3-10)

obtain

maximum

output

the

left

channel.

Note

that

this

adjustment

has

relationship

with

stereo

distortion.

Test

Equipment

Required

stereo

signal

generator

VTVM

Oscilloscope

Record

the

output

level

the

left

channel

when

the

stereo

signal

generator

input

selector

set

the

left

channel.

Preparation:

Remove

the

wooden

case

described

Procedure

2-1

page

: ;

Switch

the

stereo

signal

generator

input

selector

Connect

the

test

equipment

shown

Fig.

3-8,

then

set

the

stereo

signal

generator

controls

follows:

Carrier

frequency

...

MHz

Output

level.......-

1,000

(60

dB)

Mode

........-.--

Stereo

Audio

(400

Hz)

Mod

67.5

kHz

(90

Pilot

(19

kHz)

Mod...

7.5

kHz

(10

Note:

kHz

(100

the

metering

indicates

total

modulation

(audio-pilot).

the

right

channel

and

read

the

residual

signal

level

the

left

channel.

The

output-level

residual-level

ratio

represents

the

separation.

Adjust

separation

adj.

control

RV501

(see

Fig.

3-10)

for

minimum

residual

level.

Check

the

right

channel

for

separation.

Usually,

about

difference

channel

separation

exists.

Readjust

RV501

for

minimum

difference

between

left-

and

right-channel

separation.

While

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