Sony PS-X75 User manual

Table of contents

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SPECIFICATIONS

GENERAL

TURNTABLE

Power

Requirements:

240

V

ac

~

Platter:

adjustable,

50/60

Hz

(UK

model)

220

V

ac

~

Motor:

adjustable,

50/60

Hz

(AEP

model)

120

V

ac,

60

Hz

(US,

Canadian

mode!)

Drive

System:

110

—

120,

220

—

240

V

ac

~

adjustable,

50/60

Hz

(E

model)

Speed:

Power

Consumption:

18W

Dimensions:

Approx.

480

(w)

x

165

(h)

x

420

(d)

mm

19

(w)

x

61/,

(h)

x

16%

(d)

inches

including

projecting

parts

and

controls

Weight:

Approx.

13

kg,

28

Ib

11

oz

(net):

Approx.

15

kg,

33

Ib

2

oz

(in

shipping

carton)

SAFETY-RELATED

COMPONENT

WARNING!!

COMPONENTS

IDENTIFIED

BY

SHADING

AND

MARK

A

ON

THE

SCHEMATIC

DIAGRAMS,

EXPLODED

VIEWS

AND

IN.

THE

PARTS

LIST

ARE

CRITICAL

TO

SAFE

OPERATION.

REPLACE

THESE

COMPONENTS

WITH

SONY

PARTS

WHOSE

PART

NUMBERS

APPEAR

AS

SHOWN

IN

THIS

MANUAL

OR

IN

SUPPLEMENTS

PUBLISHED

BY

SONY.

ATTENTION

AU

COMPOSANT

AYANT

RAPPORT

A

LA

SECURITE!

LES

COMPOSANTS

IDENTIFIES

PAR

UNE

TRAME

ET

UNE

MARQUE

/\

SUR

LES

DIAGRAMMES

SCHE-

MATIQUES,

LES

VUES

EXPLOSEES

ET

LA

LISTE

DES

PIECES

SONT

CRITIQUES

POUR

LA

SECURITE

DE

FONCTIONNEMENT.

NE

REMPLACER

CES

COMPOSANTS

QUE

PAR

DES

PIECES

SONY

DONT

LES

NUMEROS

SONT

DONNES

DANS

CE

MANUEL

OU

DANS

LES

SUPPLEMENTS

PUBLIES

PAR

SONY.

US

Model

Canadian

Model

AEP

Model

UK

Model

E

Model

STEREO

TURNTABLE

SYSTEM

Speed

Control

Range:

Starting

Characteristics:

Wow

and

Flutter:

Signal-to-Noise

Ratio:

Speed

Deviation:

Load

Characteristics:

Automatic

System:

32

cm

(125/,

inches),

aluminum-alloy

diecast

DC

servo-controlled

linear

BSL

motor

Direct

drive,

crystal-lock

and

magneciisc

servo

control

system

331/,

rpm,

45

rpm

+10

%

(crystal!

lock

OFF)

Comes

to

nominal

speed

within

a

habf

revolution

(331/,

rpm)

+0.035

%

(DIN)

0.025

%

(WRMS)

78

dB

(DIN-B)

Within

0.003

%

0

%

at

tracking

force

up

to

150

g

(at

lead-in

groove

of

a

record)

Lead-in,

return,

reject,

repeat

record-size

selection

—

Continued

on

page

2

—

SONY.

SERVICE

MANUAL

PS-X75

|

TONEARM

Type:

Pivot-to-Stylus

Length:

Overal!

Arm

Length:

Overhang:

Tracking

Error:

Stylus

Force

Adjustment

Range:

Sheil

Weight:

Cartridge

Weight

Range:

(including

supplied

headshe!l)

Electronic

tonearm,

universal

235

mm

(91/,

inches)

330

mm

(13

inches)

13

mm

(%,6

inches)

+2°40',

—1°30'"

0-—3.09

11g

12-199

19

—

26

g

(with

extra

weight)

MODEL

IDENTIFICATION

—

Specification

Label

—

STEREO

TURNTABLE

SYSTEM

MODEL

NO,

PS-X75

SERIAL

NO.

US,

Canadian

model:

AC

120

V

60

Hz

18

W

AEP

model:

AC

220

V

~

50/60

Hz

18

W

MADE

IN

JAPAN

UK

model:

AC

240

V

~

50/60

Hz

18

W

E

model:

AC

110

—

120,

220

—

240

V

~

50/60

Hz

18

W

|

PS-X75

SERVICING

NOTES

Handling

Precautions

for

MOS

ICs

(1C103,

104,

107,

108,

110

—

112)

Generally,

the

insulation

resistance

of

the

oxide

layer

in.

MOS

IC

structures

is

very

high,

and

the

oxide

layer

is

very

thin.

Because

of

this,

it

is

possible

that

the

static

voltages

usually

present

on

clothes

and

the

human

body

will

be

enough

to

generate

a

potential

difference

across

the

insulator,

high

enough

to

cause

a

breakdown

of

the

insulating

layer.

The

following

precautions

should

be

taken

while

handling

these

ICs.

(Particular

care

should

be

taken

under

conditions

of

low

humidity.)

Precautions

in

Replacing

MOS

ICs

1.

Store

new

ICs

by

inserting

them

into

a

urethane-

polyester

cushion

(which

is

somewhat

conduc-

tive),

or

wrapping

it

in

aluminum

foil,

so

that

all

the

pins

are

at

the

same

potential.

(The

ICs

should

be

stored

in

that

manner

until

mounted

on

the

circuit

board.)

Fig.

A

partially

conductive

unrethane-polyester

cushion

1c

Fig.

B

aluminum

foil

2.

Check

the

soldering

iron

for

possible

power-line

leakage

current.

Make

sure

that

there

is

no

leakage

path

by

connecting

an

ohmmeter

to

the

tip

of

the

soldering

iron

and

the

plug

as

shown

in

Fig.

C.

If

there

is

a

leakage

path,

use

some

other

soldering

iron.

VOM

(2.x

10,000

range)

3.

Equalize

any

potential

difference

between

the

clothes,

the

tools

in

use,

the

work

bench,

the

set

being

worked

on,

and

the

packaged

IC

by

touching

them

all

in

succession

with

the

hands

or

a

conductive

wire

or

tool.

4.

The

following

are

effective

methods

for

handl-

ing

ICs

that

remove

the

potential

difference

across

the

oxide

layer.

@

Use

a

paper

clip

modified

by

soldering

in

a

wire

braid

insert.

wire

braid

soldered

soldered

:

Make

sure

that

there

is

Fig.

D

no

solder

on

the

inside.

clip

partially

conductive

"

urethane-polyester

Fig.

E

cushion

or

aluminun

oil

wire

braid

D>)

clip

(—=—~sossscsnssecsereor

es

aes

@aSabeas

ITT

Lt

Ld

hae

SXXEE

AEE

EES

Make

sure

that

all

the

pins

are

in

contact

with

the

wire

braid

{all

:

the

pins

will

then

be

at

the

same

Fig.

F

_

potential.).

PS-X75

®

Take

a

short

length

of

fine

bare

wire

and

wind

it

around

the

IC

so

that

it

shorts

all

the

pins

of

the

IC,

while

it

is

still

in

the

urethane-

polyester

cushion

or

aluminum

foil.

This

ensures

that

all

the

pins

are

at

the

same

potential.

fine

bare

wire

(stripped

solid

hookup

wire,

etc.)

partially

conductive

urethane-polyester

cushion

or

aluminum

foil

Fig.

G

@

When

it

is

necessary

to

handle

the

IC

with

the

fingers,

do

not

touch

any

pin,

and

hold

the

IC

at

the

ends

of

its

plastic-package

case

as

shown

in

Fig.

H.

Fig.

H

Method

of

Mounting

Insert

the

IC

while

holding

it

with

the

modified

clip,

and

solder

all

the

pins

with

the

clip

still

shorting

the

pins.

(Similarly,

solder

all

the

pins

while

the

bare

shorting

wire

is

still

wound

around

them.).

Remove

the

clip

or

the

bare

shorting

wire

only

after

all

the

pins

have

been

soldered.

Precaution

while

Checking

C-MOS

ICs

The

C-MOS

ICs

(Complementary

MOS)

are

MOS

ICs

that

have

their

output

sections

made

up

of

N-channel

and

P-channel

push-pull

stages

to

increase

their

speed

of

operation.

If

the

output

terminal

of

these

ICs

comes

into

contact

with

B+

or

B-

voltage,

then

the

FET

which

is

ON

at

that

time

will

either

become

shorted

or

open.

This

is

valid

for

all

the

output

sections

that

are

connected

together

by

the

interconnections.

Even

the

circuits

that

are

physically

separated

(and

not

on

the

same

board)

can

be

destroyed

simultaneously.

Example:

If

this

line

is

grounded,

or

touches

B+

or

B-

bus...,

the

output

stage

of

this

IC

will

be

destroyed.

Fig.

1

PS-X75

SECTION

1

OUTLINE

BLOCK

DIAGRAM

1-1.

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02

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BATYd

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HOW

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JOVLIOA

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PS-X75

|

1-2.”

ELECTRONICALLY-CONTROLLED

TONEARM

“BIOTRACER”

1-2-1.Resonance

Damping

at

Low

Frequencies

by

Speed

Feedback:

Tonearm

vibration,

particularly

the

resonance

generated

at

low

frequencies,

is

automatically

reduced

by

feeding

the

speed

fractuation

to

the

linear

motor

which

monitors

the

speed

of

the

tonearm.

1-2-2.

Front-panel-controlled

Stylus

Force:

To

set

the

stylus force,

turn

the

knob

on

the

front

panel,

and

the

built-in

microcomputer

will

measure

the

force.

Changing

of

the

stylus

force

while

listening

to

the

tones

is

also

possible.

1-2-3.

Remote

Full-Auto

Function:

A

luminar

sensor

controls

the

tonearm’s

lead-in

and

return,

while

monitoring

of

the

down

and

return-

ing

positions

is

carried

out

by

the

linear

motor.

Accordingly,

the

operation

is

accurate

and

virtually

silent.

1-2-4.

Tonearm

Lifter

Control

from

Front

Panel:

The

up/down

operation

of

the

tonearm

lifter

is

controlled

by

the

vertical

linear

motor,

and

the

damper,

fitted

with

a

speed

feedback

circuit,

operates

smoothly

free

from

the

effects

of

temperature

change

and

aging.

A

muting

circuit

operates

when

the

tonearm

is

in

its

top

position

and

because

this

function

is

cancelled

when

the

tonearm

is

down

on

the

turntable,

the

bother

of

having

to

lower

the

amplifier

volume

every

time

the

stylus

has

landed

on

the

record

is

eliminated.

1-2-5,

Fast

Repeat

Facility:

Repeat

operation,

controlled

electronically

by

the

horizontal

linear

motor,

begins

as

soon

as

the

tonearm

returns

to

near

the

edge

of

a

record.

1-2-6.

Manual

Operation

with

the

Dust

Cover

in

Place:

Manual

operation

is

throughly

possible

without

touching

the

tonearm,

since

the

upward/downward

and

rightward/leftward

movement

of

the

tonearm

can

be

done

by

buttons

provided

on

the

control

panel.

1-3,

TURNTABLE

AND

OTHERS

1-3-1.

Automatic

Record-size

Detection

Facility:

The

size

of

records

is

monitored

and

measured

by

using

a

photo-electric

device

and

a

built-in

micro-

computer

which

then

automatically

puts

the

tonearm

into

operation.

1-3-2.

Crystal-locked

Magnedisc

Servo

System:

The

turntable

driving

system

employs

the

es-

tablished

magnedisc

system

known

as

a

highly-

accurate

rotation

monitoring

and,

a

phase-locking

using

a

precision

output

frequency

generated

by

a

crystal

oscillator

to

obtain

a

constant

turntable

rotation

with

low

drift.

1-3-3.

Linear

BSL

Motor:

A

smooth

and

silent

rotation

is

obtained

from

the

Linear

BSL

Motor

—

almost

no

cogging

which

can

become

a

source

of

wow

and

flutter

or

S/N

degradation.

Having

a

high

torqueage,

the

starting

response

is

excellent

at

a

half

of

a

turn.

1-3-4,

Turntable

Incorporates

Electromagnetic

Brake:

Playing

of

records

is

easy

due

to

the

tonearm’s

independent

operation

and

the

simple

start/stop

Operation

of

the

turntable

rotation,

and

a

lead-in

to

a

music

is

done

very

easily.

Also,

with

the

electro-

magnetic

brake,

stopping

the

turntable

is

smooth

and

quick

as

well

as

simple

to

use.

1-4,

CIRCUIT

DESCRIPTION

1-4-1.

When

the

POWER

Switch

is

turned

on

(see

Fig.

1):

The

waveform

shaper,

consisting

of

IC111,

turns

the

voltage

at

terminal

(3)

of

IC102

to

low

level

“0”

in

half

a

second

during

which

C112

is

charged

with

B+

power.

Asa

result,

IC102

is

reset.

OV

Fig.

1

S501

(POWER}:

ON

1-4-2.

Arm

Lifter

Raising/Lowering

Circuit(see

Fig.

2):

Turning

the

power

switch

on

raises

the

arm

lifter.

[Lowering

the

arm

lifter]

When

S508

(UP/DOWN)

is

depressed,

the

voltage

at

terminal

(24)

of

IC102

becomes

high

“1”.

This

turns

the

voltage

at

terminal

(6)

of

IC112

to

positive

and

the

voltage

at

terminal

(7)

to

negative.

Asa

result,

Q131

switches

on.

The

potential

of

the

terminal

(2)

of

IC112

now

becomes

negative

and

the

output

of

the

terminal

(1)

goes

positive.

This

turns

Q128

on.

|

aa

OV

ARM

LIFTER

DOWN

Fig.

2

-—-7-—

|

PS-X75

This

means

that

the

microprocessor

(IC102)

does

not

operate

for 0.5

seconds

after

the

power

switch

is

turned

on.

Also,

buttons

can

be

effectively

pressed

after

it

is

assured

that

the

tonearm

has

been

on

the

arm

rest

for

about

0.5

seconds.

S501

(POWER):

ON

rn

IT

Since

both

Q128

and

Q131

are

on,

current

passes

through

L505

(lifter

drive

coil)

in

direction

A,

thus

lowéring

the

arm

lifter.

[Raising

the

arm

lifter]

When

S508

is

depressed,

the

voltage

at

terminal

(25)

of

1C102

becomes

high

“1”.

This

turns

the

voltage

at

terminal

(7)

of

IC112

to

positive,

switching

Q130

on.

Since

Q130

is

on,

a

negative

voltage

appears

at

terminal

(1),

turning

Q127

on.

Now

that

both

Q127

and

Q130

are

on,

current

passes

through

L505

in

direction

B,

thus

raising

the

arm

lifter.

ARM

LIFTER

ARMLIFTER

DOWN

ARM

LIFTER

ARMLIFTER

DOWN

uP

PS-X75

|

1-4-3.

Tonearm

Swivelling

Circuit

(see

Fig.

3):

Turning

the

power

switch

on

returns

the

tonearm

to

the

arm

rest.

[

>

:

BACK]

When

S507

(

>

:

BACK)

is

turned

on,

the

voltages

at

terminals

(17)

and

(18)

of

IC102

become

high

“1”.

This

turns

the

voltages

at

terminals

(6)

and

(7)

of

IC110

respectively

to

positive

and

negative.

<A

negative

voltage

then

appears

at

terminal

(1)

of

IC110.

FORWARD

1-4-4,

Tonearm

Lifting

Circuit

(see

Fig.

4):

When

the

arm

lifter

is

lowered

in

the

zero

balance

are,

Q108

turns

off

because

the

voltage

at

terminal

(20)

of

IC102

is

high

“1”.

As

a

result,

varying

RV502

(STYLUS

FORCE:ANTI

SKATING)

causes

no

change

in

the

stylus

force.

However,

since

the

voltage

at

terminal

(23)

of

IC102

becomes

low

“0”,

a

positive

voltage

appears

at

terminal

(1)

of

I1C109,

turning

Q121

on.

This

causes

current

to

pass

through

L501

(vertical

drive

coil)

in

direction

A

and

lifts

the

tonearm.

This

function

helps

apply

a

constant

stylus

force

when

the

tonearm

is

moved

forward

or

backward,

thereby

preventing

the

arm

from

deflecting.

Also,

since

the

voltage

at

terminal

(26)

of

1C102

becomes

low

“0”,

Q133

turns

off.

This

lowers

the

gate

voltage

of

Q132,

resulting

in

no

MFB

current

which

would

otherwise

generate

in

L502,

with

the

movement

of

the

tonearm.

When

the

arm

lifter

is

Fig.

3

As

a

result,

Q125

turns

on

to

pass

current

through

L503

(horizontal

drive

coil)

in

direction

A,

returning

home

the

tonearm.

[<d:

FORWARD]

When

S506

(<:

FORWARD)

is

turned

on,

the

voltages

at

terminals

(15)

and

(16)

of

IC102

become

high

“1”,

This

turns

the

voltage

at

terminal

(1)

of

IC110

to

positive,

and,

consequently,

switches

Q124

on.

Now

that

Q124

is

on,

current

flows

through

L503

in

direction

B,

moving

forward

the

tonearm.

lowered

outside

the

zero

balance

area,

Q108

turns

on

because

the

voltage

at

terminal

(20)

of

IC102

becomes

low

“0”.

Asa

result,

varying

RV502

causes

voltage

ranging

from

0

to

5

volts

to

be

applied

to

terminal

(6)

of

IC109.

A

negative

voltage

then

appears

at

terminal

(1),

turning

Q122

on.

Now

that

Q122

is

on,

L501

has

current

pro-

portional

to

the

stylus

force

in

direction

B.

5V

ov

ie]

ARM

LIFTER

DOWN

|

PS-X75

Bt

=

Q108

UT

OF

ZERO

BALANCE.

ST

@

0

1)

STYLUS

FORCE

Og7>39

ae

Tepe

at

avaoe

TO

HORIZONTAL-

[-D

9

DRIVE

CIRCUIT

FSO

=

Bt

1C109

er

ce

oO”

sas

@-O-}>-O+Omn

|

|S

aie

ote

a.

Mma

bd

2]

&

1502

iaioe

al

Com

&

7

B

STYLUS

FORCE

2

9

Q122

NE

39

Bt

<I

0133

eae

er

BALA

@

©)

Le

6)

tO)

i>

Q132

5

Vv

\

ci

_

1C102

oie

1C103

kay

WITHIN

ZERO

;

B-

BALANCE

Fig.

4

(ARM

LIFTER

DOWN)

1-4-5,

Automatic

Disk

Size

Detector

(see

Fig.

5):

As

long

as

the

turntable

is

rotating,

the

light

from

PLS501

passes

through

the

prism

on

the

turntable

mat

and

switches

phototransistors

Q501

and

Q502.

The

outputs

of

Q501

and

Q502

are

fed

to

termi-

nals

(30)

and

(31)

of

IC102

to

be

used

for

automatic

detection

of

the

disk

size.

when

no

record

placed

—--~

SS

when

a

record

p+

placed:

OV

when

no

record

___

placed

i

[|

|

OV

when

a

record

placed:

0V

[Nodsk

|

1

|

St

*d

Cn

Ee

ee

ee

ee

ee

e

when

a

record

plaed:

0

when

no

record

paced:

7

Q502

PL501

Le

B-

Fig.

5

PS-X75

1-4-6.

Drop-point

and

End

Detection

(see

Figs.

6

and

7):

When

S504

(AUTO

START)

is

turned

on,

the

tonearm

moves

toward

the

disk.

The

presence

of

a

drop-point

on

the

disk

is

deter-

mined

by

counting

slits

of

the

movable

shutter

ro-

tating

with

the

tonearm.

The

end

of

a

disk

is

also

detected

by

counting

slits

of

the

movable

shutter.

After

detecting

the

end,

the

tonearm

returns.

Slits

are

counted

as

follows.

The

light

emitted

by

D401

and

D402

strike

on

the

movable

shutter.

If

the

light

from

D401

(D402)

passes

a

slit,

it

turns

on

Q301

(Q302).

The

outputs

of

Q301

and

Q302

are

fed

to

the

Schmitt

circuit

consisting

of

IC103,

where

the

waveforms

are

shaped.

The

shaped

outputs

are

applied

to

terminals

(32)

and

(33)

of

IC102.

Also,

whether

the

tonearm

is

moving

forward

or

backward

is

determined

by

comparing

the

phases

of

the

signals

from

terminals

(32)

and

(33)

of

IC102.

fixed

slitA

—

—_

phase

difference:

90°

slit

of

movable

shutter

—_—

=

fixed

slitB

slit

B

|

|

|

|

| |

| |

|

|

{FORWARD)

slitA

|

|

|

| | |

| |

|

|

slitB

| |

|

|

|

|

|

|

|

|

|

(BACK)

D401

D402

Fig.

7