Sony ST-88 User manual

Table of contents

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Fm

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:

Fm

Stereo

separation:

A-m

Tuner

Section

Tuning

range:

Antenna:

*.

STEREO

TUNEN

$T-80

Lf

enn,

SPECIFICATIONS

87.5

to

108

MHz

300

ohms

balanced

10.7

MHz

2.2

LV

(IHF)

1.7

LV

(S/N

=

30

dB)

65

dB

2.5

dB

50

dB

(IHF)

45

dB

75

dB

45

dB

30

Hz

to

15

kHz

+2

dB

Mono;

0.5

%

at

400

Hz

100

%

Mod.

Stereo;

0.8

%

at

400

Hz

100

%

Mod.

greater

than

36

dB

at

400

Hz

530

to

1,605

kHz

Built-in

bar

antenna

with

external

antenna

provision

Intermediate

frequency:

Sensitivity:

19

kHz,

38

kHz

suppression:

S/N

ratio:

Image

rejection:

\-f

rejection:

Harmonic

distortion:

General

Power

requirements:

Power

consumption:

Dimensions:

Net

weight:

Shipping

weight:

AEP,

UK

and

USA

Model

FM

STEREO/

FM-AM

TUNER

455

kHz

(USA

and

AEP

Model)

468

kHz

(UK

Model)

48

dB/m,

built-in

antenna

100

LV,

external

antenna

45

dB

50

dB

40

dB

at

1,000

kHz

45 dB

at

1,400

kHz

30

dB

at

1,000

kHz

0.8

%

120

V,

60

Hz

ac

(USA

Model)

110,

127,

220,

240

V

50/60

Hz

ac

(AEP

and

UK

Model)

10W

128

(w)

x

232

(h)

x

210

(d)

mm

516

(w)

x

94g

(h)

x

8%

(d)

inches

approx.

2.7

kg

(5

Ib

15

oz)

approx.

3.2

kg

(7

Ib

1

oz)

SONY.

SERVICE

MANUAL

pte

Section

TABLE

OF

CONTENTS

Title

Page

TECHNICAL

DESCRIPTION

1-1.

Block

Diagram

2...

2

ee

eee

\

DISASSEMBLY

AND

REPLACEMENT

2-1.

Wooden

Case

Removal...

2-2

eee

eet

ets

2

9-2.

Front

Panel

Removal...

2...

eee

ee

ere

ts

2

9-3.

Front

Subchassis

Removal...

2.

eee

eee

ts

2

2-4.

Fm

(A-m)

Front-End/I-f

Amp/MPX

and

Preamplifier

Board

Removal...

.-

ee

eee

ett

te

3

7-5.

Power

Supply

Board

Removal

....--

eee

setts

3

9.6.

Dial

Cord

Restringing

©...

eee

et

3

9-7.

DialLamp

Replacement

...-.

0

eee

rete

ttre

4

2-8.

Tuner

Input

Meter

Replacement...

--

+--+

eee

eet

tt

4

2-9,

Band,

Mode,

Afc

and

Power

Switch

Replacement

...--

+--+

--:

4

9-10.

Chassis

Layout...

2.

ee

ee

5

ALIGNMENT

AND

ADJUSTMENT

3-1.

Fm

I-f

and

Discriminator

Alignment

....-

+--+

eee

rrrrcs

6

3-2.

Fm

Frequency

Coverage

and

Tracking

Alignment

.....----:5

7

3-3.

Fm

Stereo

Separation

Adjustment...

6.

-

eee

te

tts

8

3-4,

A-mI-f

Strip

Alignment

..

2...

-

ee

ee

ree

ts

9

3-5.

A-m

Frequency

Coverage

and

Tracking

Alignment

.....--+---

9

REPACKING......--

+++

ee e5

ee

en

ee

11

DIAGRAMS

5-1.

Mounting

Diagram

—

Power

Supply

and

Attenuator

Boards

.....

-

13

5-2.

Mounting

Diagram

—

Fm

(A-m)

Front-End/I-f

Amp/MPX

and

Preamplifier

Board...

.-

+--+

eee

rrr

tts

14

5-3,

SchematicDiagram....----

eee

eee

ett

15

EXPLODED

VIEWS...

...----

0s

etree

teers

17

ELECTRICAL

PARTS

LIST

.....---

22s

ee

errr

19

(Ooty

SECTION

1

TECHNICAL

DESCRIPTION

BLOCK

DIAGRAM

1-1.

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wy

wd

(zosr)

TWNINY

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LNdLNO

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HOIH

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qewwon

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SECTION

2

DISASSEMBLY

AND

REPLACEMENT

Note:

All

screws

in

this

service

manual

are

Phillips

type

(cross

recess),

unless

other-

wise

specified.

(—):

slotted

head

2-1.

WOODEN

CASE

REMOVAL

1.

Remove

the

four

screws

(P

4

x

16)

securing

the

wooden

case

to

the

chassis

along

with

the

rubber

feet.

2.

Remove

the

two

screws

as

shown

in

Fig.

2-1.

mee

ANT

;

|

au

GRouaD

[Ts00s

B

.

Fj

ey

ok

.

)

:

:

Be

x8

|

~

sy

Fig.

2-1.

Wooden

case

removal

;

ae

D

hee

ie

a

j

y

~

|

ats

2-2.

FRONT

PANEL

REMOVAL

1.

Remove

the

wooden

case

as

described

in

Procedure

2-1.

2.

Pull

out

the

tuning

knob.

3.

Remove

the

four

screws

securing

the

front

panel

to

the

chassis

as

shown

in

Fig.

2-2.

4.

Remove

the

front

panel

in

the

arrow

direction

shown

in

Fig.

2-3.

5.

Unsolder

the

two

lead

wires

from

the

TUNER

INPUT

meter

and

pull

out

the

lamp

socket

from

the

TUNER

INPUT

meter

bracket

as

shown

in

Fig.

2-3.

2-3.

FRONT

SUBCHASSIS

REMOVAL

1.

Remove

the

wooden

case

and

the

front

panel

as

described

in

Procedures

2-1

and

2-2.

2.

Remove

the

nine

screws

(

(A)

)

as

shown

in

Fig.

2-4

and

Fig.

2-5.

3.

Pull

off

the

STEREO

lamp

from

the

grommet.

;

Fig.

2-4.

Front

subchassis

removal

oo

«oy

Fig.

2-5.

Front

subchassis

removal

(2)

2-4.

FM

(A-M)

FRONT-END/I-F

AMP/MPX

AND

PREAMPLIFIER

BOARD

REMOVAL

1.

Remove

the

wooden

case

as

described

in

Procedure

2-1.

2.

Unsolder

the

ribbon

antenna

at

the

fm

(a-m)

front-

end/i-f

amp/MPX

and

preamplifier

board

as

shown

in

Fig.

2-6.

3.

Remove

the

rear

panel

in

the

arrow

direction

by

loosening

the

three

screws

(

©

)

as

shown

in

Fig.

2-6.

4.

Loosen

the

two

screws

(

®))

as

shown

in

Fig,

2-4,

antenna,

NX

=

\

fm

(a-m)

front-end/

|

i-f

amp/MPX

and

_”

preamplifier

board

Fig.

2-6.

Fm

(a-m)

front-end/j-f

amp/MPX

and

preamplifier

board

removal

5.

6.

Remove

the

two

screws

(B))

as

shown

in

Fig.

2-5.

Carefully

remove

the

board

from

the

chassis

taking

care

not

to

break

the

lead

wires.

2-5.

POWER

SUPPLY

BOARD

REMOVAL

1.

Remove

the

wooden

case

as

described

in

Procedure

2-1.

.

Unsolder

the

three

lead

wires

(red,

white

and

black)

connecting

the

power

supply

board

and

the

fm

(a-m)

front-end/i-f

amp/MPX

and

preamplifier

board.

.

Unsolder

the

ribbon

antenna

as

shown

in

Fig.

2-6.

-

Loosen

the

three

screws

(

©)

as

shown

in

Fig.

2-6.

.

Carefully

open

the

rear

panel

in

the

arrow

direction

shown

in

Fig.

2-6

taking

care

not

to

break

the

lead

wires,

.

Remove

the

two

screws

(B

3

x

5)

securing

the

power

supply

board.

2-6.

DIAL

CORD

RESTRINGING

1,

10.

11.

Remove

the

wooden

case,

front

panel

and

front

subchassis

as

described

in

Procedures

2-1,

2-2

and

2-3.

.

Make

a

loop

of

the

dial

cord

as

shown

in

Fig.

2-7.

.

Make

a

knot

and

hook

a

spring

to.

the

dial

cord

and

then

fasten

the

knot

as

shown

in

Fig.

2-8.

.

Loosen

the

two

screws

securing

the

dial

scale

ass’y

to

the

tuning

drum

shaft

and

remove

the

dial

scale

ass’y.

-

Hook

the

spring

to

the tab

on

the

dial

scale

ass’y

and

string

the

dial

cord

around

the

dial

scale

ass’y

and

the

tuning

shaft

in

numerical

order

as

shown

in

Fig.

2-9

and

2-10.

.

Install

the

dial

scale

ass’y

to

the

tuning

drum

shaft

and

fix

a

dial

scale

set

screw

temporarily.

.

Set

the

AFC

switch

to

OFF.

.

Tune

the

set

to

the

local

fm

station

by

turning

the

tuning

shaft.

Loosen

the

dial

scale

set

screw

and

turn

the

dial

scale

ass’y

to

the

position

where

the

fm

pointer

on

the

dial

front

glass

indicates

the

local

fm

station’s

carrier

frequency.

Fix

the

two

dial

scale

set

screws.

Make

sure

that

the

correct

dial

calibration

is

also

done

at

a-m

mode.

dial

cord

317

mm

(1242)

hot

0.3

mm

(

Yea)

dia.

Fig.

2-7.

Dial

cord

2

the

dial

cord.

Fig.

2-8.

Finish

point

of

dial

cord

dial

cord

dial

scale

ass‘y

!

|

yvatt

two

turns

Fig.

2-10.

Dial

cord

restringing

(Front

View)

2-7.

DIAL

LAMP

REPLACEMENT

1.

Remove

the

wooden

case

and

front

panel

as

described

in

Procedures

2-1

and

2-2.

.

Slide

the

lamp

socket

forward

to

permit

removal

of

lamp

as

shown

in

Fig.

2-11.

.

Unscrew

the

lamp

from

the

socket

and

install

a

new

one

and

push

the

socket

back

to

its

original

place.

Fig.

2-11.

Dial

lamp

removal

2-8.

TUNER

INPUT

METER

REPLACEMENT

1.

Remove

the

wooden

case

and

front

panel

as

described

in

Procedures

2-1

and

2-2.

.

Unsolder

the

two

lead

wires

and

remove

the

two

screws

as

shown

in

Fig.

2-12.

.

Install

a

new

one.

2-9.

BAND,

MODE,

AFC

AND

POWER

-

WwW

SWITCH

REPLACEMENT

.

Remove

the

wooden

case

and

front

panel

as

described

in

Procedures

2-1

and

2-2.

.

Remove

the

two

screws

securing

each

switch

to

the

chassis

as

shown

in

Fig.

2-13.

.

Unsolder

the

switch

lead

wires.

Install

a

new

one.

_)

B3x

6,

self-tapping

TUNER

INPUT

meter

B3x6é

self-tapping

TUNER

INPUT

"Q

Of

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

fm

(a-m]

front-end/i-f

amp/MPX

attenuator

and

preamplifier

board

board

power

supply

board

power

transformer

Fig.

2-14.

Chassis

layout

SECTION

3

ALIGNMENT

AND

ADJUSTMENT

3-1.

FM

I-F

AND

DISCRIMINATOR

Simel

oorerster

menos

«

ALIGNMENT

:

;

S

Test

Equipment

Required

CAUTION

1,

Signal

generator

capable

of

generating

a

10.7

MHz

The

ceramic

filters

in

the

fm

i-f

circuit

are

a-m/fm

signal.

selected

according

to

their

specified

center

fre-

quencies

and

color

coded

as

shown

in

Fig.

3-1

2.

Oscilloscope

and

listed

in

Table

3-1.

Check

the

color

code

of

Vertical

sensitivity

100

mV/cm

minimum

the

filters

to

identify

the

same

center

frequency

nae

when

replacing

any

of

these

filters.

3.

Ac

VIVM

4.

Alignment

tools

TABLE

3-1.

FM

I-F

CERAMIC

FILTERS

Preparation:

Part

No.

Color

Specified

Center

Freq.

1.

Connect

the

input

cable

of

the

oscilloscope

with

Higator

cli

-

ees

sana

ie

10.70

MHz

alligator

clips

to

R229

and

ground

on

the

fm

(a-m)

front-end/i-f

amp/MPX

and

preamplifier

board,

and

ESgeaeee!

pits

sp

tetales

solder

a

0.02

uF

capacitor

across

these

clips

as

'/.

1-527-220-3

1

orange

10.73

MHz

aye

Fi

P P

;

1-527-220-41

black

10.64

MHz

ai

Re:

1-527-220-51

white

10.76

MHz

2.

Connect

the

output

cable

of

the

generator

across

CV102

on

the

fm

(a-m)

front-end/i-f

amp/MPX

and

preamplifier

board

through

a

0.02

uF

coupling

.

capacitor

as

shown

in

Fi

color

dot

a

BPR

5

AMES

AER

Fig.

3-1.

Color

dot

on

ceramic

filter

y

;

€

iz)

02

uF

S%

‘er

fzas

R2

Rel

a-M

osc

trimmer

Fig.

3-2.

Interruption

of

fm

or

a-m

local

oscillator

operation

Note:

Local

oscillator

should

be

killed

when

performing

this

alignment.

To

stop

the

local

oscillator

operation,

shunt

the

oscil-

lator

capacitor

with

a

0.02

UF

capacitor

as

shown

in

Fig.

3-2.

To

rf

signal

{

generator

Fig.

3-4.

10.7-MHz

signal

injection

Procedure:

1.

With

the

equipment

connected

as

shown

in

Fig.

3-5,

set

the

signal-generator

controls

as

follows:

Frequency........

Specified

frequency

of

ceramic

filter.

See

Table

3-1.

Modulation

.......

Fm,

400

Hz,

100

%

(75

kHz)

Output

level.......

1,000

nV

(60

dB)

2.

Set the

tuner

switches

as

follows:

BAND

switch......

FM

MODE

switch......

MONO

AFC

switch

.......

OFF

3.

Adjust

the

signal

generator

frequency

slightly

to

obtain

a

maximum

output,

and

then

change

the

signal

generator

modulation

to

a-m,

400

Hz

30

%.

4.

If

the

discriminator

transformer

IFT201

is

not

aligned

correctly,

400

Hz

ripple

will

be

observed

as

shown

in

Fig.

3-6.

5.

Turn

the

secondary

side

core

(green)

of

discrimina-

tor

transformer

IFT201

(see

Fig.

3-10)

with

an

alignment

tool

to

obtain

a

minimum

indication

on

the

oscilloscope

as

shown

in

Fig.

3-6.

Fig.

3-6.

Fm

discriminator

alignment

output

response

Note:

Turn

the

core

carefully

and

slowly

because

the

output

appearing

on

the

oscilloscope

jumps

up

and

down

when

turning

the

core.

This

might

cause

diffi-

culty

in

determining

the

point

of

mini-

mum

output.

Also,

at

both

extreme

positions

of

the

top

core,

decreased

out-

put

will

be

observed.

The

real

null

point

should

be

obtained

in

the

middle

of

the

rf

eae

signal

Cv102

generator

=

OQ-—-__~__—____—__.

R229

|

core

thread

length,

and

maximum

output

occurs

at

each

side

of

the

true

null

point.

6.

Change

the

signal

generator

modulation

to

fm,

400

Hz

100

%.

7.

Turn

the

core

of

fm

IFT101

and

primary

side

core

(brown)

of

discriminator

transformer

IFT201

(see

Fig.

3-10)

to

obtain

the

maximum

output.

3-2.

FM

FREQUENCY

COVERAGE

AND

TRACKING

ALIGNMENT

Note:

Before

starting

this

alignment,

the

fm

i-f

and

discriminator

alignment

should

be

performed.

Test

Equipment

Required

1.

Fm

signal

generator

2.

Ac

VTVM

3.

Oscilloscope

4.

Alignment

tools

Preparation:

1.

Connect

the

equipment

as

shown

in

Fig.

3-7.

2.

Set

the

tuner

switches

as

follows:

BAND

switch...

...

FM

MODE

switch.

.....

MONO

AFC

switch...

2...

OFF

Signal

Generator

Method

Follow

the

procedures

given

in

Table

3-2

when

performing

this

alignment

with

an

fm

signal

generator.

Be

sure

that

the

dial

is

mechanically

calibrated.

Off-the-Air

Signal

Method

Accurate

dial

calibration,

and

a

frequency

cover-

age

test

can

also

be

performed

by

utilizing

off-the-air

local

fm

signals.

However,

before

performing

the

following

procedure,

be

sure

that

the

dial

is

mechani-

cally

calibrated.

oscilloscope

PAA

Fig.

3-5.

Fmi-f

and

discriminator

alignment

test

setup

by

rf

signal

generator

ST-88

ac

VTVM

oscilloscope

fm

oO

——“-"—

0

—

0

signal

ANTENNA

NORMAL

OUTPUT

IN

ma

er

generator

©

Jack

(J802)

Lo

Fig.

3-7.

Fm

frequency

coverage

and

tracking

alignment

test

setup

TABLE

3-2.

FM

FREQUENCY

COVERAGE

AND

TRACKING

ALIGNMENT

SG

Coupling.....

re

SG

Output

Level

..

400

Hz,

100

%

mod;

as

low

as

possible

Step

SG

Frequency

Dial

Indication

Ac

VTVM

Adjust

Indication

Connection

87.5

MHz

87.5

MHz

NORMAL

OSC

coil

L103

Maximum

OUTPUT

See

Fig.

3-10.

VTIVM

2

108

MHz

108

MHz

jack

(J802)

FREQUENCY

COVERAGE

ALIGNMENT

reading

OSC

trimmer

CT103

See

Fig.

3-10.

SG

Coupling.....

Direct

SG

Output

Level

..

400

Hz,

100

%

mod;

as

low

as

possible

~~

TRACKING

ALIGNMENT

87.5

MHz

87.5

MHz

NORMAL

OUTPUT

jack

(J802)

108

MHz

108

MHz

3-3.

FM

STEREO

SEPARATION

ADJUSTMENT

Maximum

VTVM

reading

Antenna

coil

L101

RF

coil

L102

See

Fig.

3-10.

Antenna

trimmer

CT101

RF

trimmer

CT102

See

Fig.

3-10.

Procedure:

1.

Precisely

tune

the

set

to

the

carrier

frequency

of

stereo

signal

generator,

then

turn

the

top

core

of

switching

transformer

L301

(see

Fig.

3-10)

to

obtain

maximum

output

at

the

left

channel.

Note

that

this

adjustment

has

a

close

relationship

with

stereo

distortion.

Test

Equipment

Required

1,

Fm

stereo

signal

generator

2.

Ac

VTVM

3.

Oscilloscope

2.

Record

the

output

level

of

the

left

channel

when

the

stereo

signal

generator

input

selector

is

set

to

the

left

channel.

Preparation:

1.

Remove

the

wooden

case

as

described

in

Procedure

2-1

on

page

2.

k

: ;

a

3.

Switch

the

stereo

signal

generator

input

selector

.

Connect

the

test

equipment

as

shown

in

Fig.

3-8,

then

set

the

fm

stereo

signal

generator

controls

as

follows:

Carrier

frequency

...

98

MHz

Output

level.......-

1,000

nV

(60

dB)

Mode

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

Stereo

Audio

(400

Hz)

Mod

.

67.5

kHz

(90

%)

Pilot

(19

kHz)

Mod...

7.5

kHz

(10

%)

Note:

75

kHz

(100

%)

if

the

metering

indicates

total

modulation

(audio-pilot).

to

the

right

channel

and

read

the

residual

signal

level

in

the

left

channel.

.

The

output-level

to

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

an

8

to

9

dB

difference

in

channel

separation

exists.

Readjust

RV501

for

minimum

difference

between

left-

and

right-channel

separation.

While

Ww

r