Sony PS-X75 Manuel utilisateur

SPECIFICATIONS

GENERAL

TURNTABLE

Power

Requirements:

240

Platter:

adjustable,

50/60

(UK

model)

220

Motor:

adjustable,

50/60

(AEP

model)

120

ac,

(US,

Canadian

mode!)

Drive

System:

110

—

120,

220

—

240

adjustable,

50/60

model)

Speed:

Power

Consumption:

18W

Dimensions:

Approx.

480

(w)

165

(h)

420

(d)

(w)

61/,

(h)

16%

(d)

inches

including

projecting

parts

and

controls

Weight:

Approx.

kg,

(net):

Approx.

kg,

(in

shipping

carton)

SAFETY-RELATED

COMPONENT

WARNING!!

COMPONENTS

IDENTIFIED

SHADING

AND

MARK

THE

SCHEMATIC

DIAGRAMS,

EXPLODED

VIEWS

AND

IN.

THE

PARTS

LIST

ARE

CRITICAL

SAFE

OPERATION.

REPLACE

THESE

COMPONENTS

WITH

SONY

PARTS

WHOSE

PART

NUMBERS

APPEAR

SHOWN

THIS

MANUAL

SUPPLEMENTS

PUBLISHED

SONY.

ATTENTION

COMPOSANT

AYANT

RAPPORT

SECURITE!

LES

COMPOSANTS

IDENTIFIES

PAR

UNE

TRAME

UNE

MARQUE

SUR

LES

DIAGRAMMES

SCHE-

MATIQUES,

LES

VUES

EXPLOSEES

LISTE

DES

PIECES

SONT

CRITIQUES

POUR

SECURITE

FONCTIONNEMENT.

REMPLACER

CES

COMPOSANTS

QUE

PAR

DES

PIECES

SONY

DONT

LES

NUMEROS

SONT

DONNES

DANS

MANUEL

DANS

LES

SUPPLEMENTS

PUBLIES

PAR

SONY.

Model

Canadian

Model

AEP

Model

STEREO

TURNTABLE

SYSTEM

Speed

Control

Range:

Starting

Characteristics:

Wow

and

Flutter:

Signal-to-Noise

Ratio:

Speed

Deviation:

Load

Characteristics:

Automatic

System:

(125/,

inches),

aluminum-alloy

diecast

servo-controlled

linear

BSL

motor

Direct

drive,

crystal-lock

and

magneciisc

servo

control

system

331/,

rpm,

rpm

+10

(crystal!

lock

OFF)

Comes

nominal

speed

within

habf

revolution

(331/,

rpm)

+0.035

(DIN)

0.025

(WRMS)

(DIN-B)

Within

0.003

tracking

force

150

(at

lead-in

groove

record)

Lead-in,

return,

reject,

repeat

record-size

selection

—

Continued

page

—

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

(91/,

inches)

330

(13

inches)

(%,6

inches)

+2°40',

—1°30'"

0-—3.09

11g

12-199

—

(with

extra

weight)

MODEL

IDENTIFICATION

—

Specification

Label

—

STEREO

TURNTABLE

SYSTEM

MODEL

NO,

PS-X75

SERIAL

NO.

US,

Canadian

model:

120

AEP

model:

220

50/60

MADE

JAPAN

model:

240

50/60

model:

110

—

120,

220

—

240

50/60

PS-X75

SERVICING

NOTES

Handling

Precautions

for

MOS

ICs

(1C103,

104,

107,

108,

110

—

112)

Generally,

the

insulation

resistance

the

oxide

layer

in.

MOS

structures

very

high,

and

the

oxide

layer

very

thin.

Because

this,

possible

that

the

static

voltages

usually

present

clothes

and

the

human

body

will

enough

generate

potential

difference

across

the

insulator,

high

enough

cause

breakdown

the

insulating

layer.

The

following

precautions

should

taken

while

handling

these

ICs.

(Particular

care

should

taken

under

conditions

low

humidity.)

Precautions

Replacing

MOS

ICs

Store

new

ICs

inserting

them

into

urethane-

polyester

cushion

(which

somewhat

conduc-

tive),

wrapping

aluminum

foil,

that

all

the

pins

are

the

same

potential.

(The

ICs

should

stored

that

manner

until

mounted

the

circuit

board.)

Fig.

partially

conductive

unrethane-polyester

cushion

Fig.

aluminum

foil

Check

the

soldering

iron

for

possible

power-line

leakage

current.

Make

sure

that

there

leakage

path

connecting

ohmmeter

the

tip

the

soldering

iron

and

the

plug

shown

Fig.

there

leakage

path,

use

some

other

soldering

iron.

VOM

(2.x

10,000

range)

Equalize

any

potential

difference

between

the

clothes,

the

tools

use,

the

work

bench,

the

set

being

worked

on,

and

the

packaged

touching

them

all

succession

with

the

hands

conductive

wire

tool.

The

following

are

effective

methods

for

handl-

ing

ICs

that

remove

the

potential

difference

across

the

oxide

layer.

Use

paper

clip

modified

soldering

wire

braid

insert.

wire

braid

soldered

Make

sure

that

there

Fig.

solder

the

inside.

clip

partially

conductive

urethane-polyester

Fig.

cushion

aluminun

oil

wire

braid

D>)

clip

(—=—~sossscsnssecsereor

aes

@aSabeas

ITT

hae

SXXEE

AEE

EES

Make

sure

that

all

the

pins

are

contact

with

the

wire

braid

{all

the

pins

will

then

the

same

Fig.

potential.).

PS-X75

Take

short

length

fine

bare

wire

and

wind

around

the

that

shorts

all

the

pins

the

IC,

while

still

the

urethane-

polyester

cushion

aluminum

foil.

This

ensures

that

all

the

pins

are

the

same

potential.

fine

bare

wire

(stripped

solid

hookup

wire,

etc.)

partially

conductive

urethane-polyester

cushion

aluminum

foil

Fig.

When

necessary

handle

the

with

the

fingers,

not

touch

any

pin,

and

hold

the

ends

its

plastic-package

case

shown

Fig.

Method

Mounting

Insert

the

while

holding

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

still

wound

around

them.).

Remove

the

clip

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

N-channel

and

P-channel

push-pull

stages

increase

their

speed

operation.

the

output

terminal

these

ICs

comes

into

contact

with

B+

B-

voltage,

then

the

FET

which

that

time

will

either

become

shorted

open.

This

valid

for

all

the

output

sections

that

are

connected

together

the

interconnections.

Even

the

circuits

that

are

physically

separated

(and

not

the

same

board)

can

destroyed

simultaneously.

Example:

this

line

grounded,

touches

B+

B-

bus...,

the

output

stage

this

will

destroyed.

Fig.

PS-X75

SECTION

OUTLINE

BLOCK

DIAGRAM

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WOIILYFA

PS-X75

1-2.”

ELECTRONICALLY-CONTROLLED

TONEARM

“BIOTRACER”

1-2-1.Resonance

Damping

Low

Frequencies

Speed

Feedback:

Tonearm

vibration,

particularly

the

resonance

generated

low

frequencies,

automatically

reduced

feeding

the

speed

fractuation

the

linear

motor

which

monitors

the

speed

the

tonearm.

1-2-2.

Front-panel-controlled

Stylus

Force:

set

the

stylus force,

turn

the

knob

the

front

panel,

and

the

built-in

microcomputer

will

measure

the

force.

Changing

the

stylus

force

while

listening

the

tones

also

possible.

1-2-3.

Remote

Full-Auto

Function:

luminar

sensor

controls

the

tonearm’s

lead-in

and

return,

while

monitoring

the

down

and

return-

ing

positions

carried

out

the

linear

motor.

Accordingly,

the

operation

accurate

and

virtually

silent.

1-2-4.

Tonearm

Lifter

Control

from

Front

Panel:

The

up/down

operation

the

tonearm

lifter

controlled

the

vertical

linear

motor,

and

the

damper,

fitted

with

speed

feedback

circuit,

operates

smoothly

free

from

the

effects

temperature

change

and

aging.

muting

circuit

operates

when

the

tonearm

its

top

position

and

because

this

function

cancelled

when

the

tonearm

down

the

turntable,

the

bother

having

lower

the

amplifier

volume

every

time

the

stylus

has

landed

the

record

eliminated.

1-2-5,

Fast

Repeat

Facility:

Repeat

operation,

controlled

electronically

the

horizontal

linear

motor,

begins

soon

the

tonearm

returns

near

the

edge

record.

1-2-6.

Manual

Operation

with

the

Dust

Cover

Place:

Manual

operation

throughly

possible

without

touching

the

tonearm,

since

the

upward/downward

and

rightward/leftward

movement

the

tonearm

can

done

buttons

provided

the

control

panel.

1-3,

TURNTABLE

AND

OTHERS

1-3-1.

Automatic

Record-size

Detection

Facility:

The

size

records

monitored

and

measured

using

photo-electric

device

and

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

highly-

accurate

rotation

monitoring

and,

phase-locking

using

precision

output

frequency

generated

crystal

oscillator

obtain

constant

turntable

rotation

with

low

drift.

1-3-3.

Linear

BSL

Motor:

smooth

and

silent

rotation

obtained

from

the

Linear

BSL

Motor

—

almost

cogging

which

can

become

source

wow

and

flutter

S/N

degradation.

Having

high

torqueage,

the

starting

response

excellent

half

turn.

1-3-4,

Turntable

Incorporates

Electromagnetic

Brake:

Playing

records

easy

due

the

tonearm’s

independent

operation

and

the

simple

start/stop

Operation

the

turntable

rotation,

and

lead-in

music

done

very

easily.

Also,

with

the

electro-

magnetic

brake,

stopping

the

turntable

smooth

and

quick

well

simple

use.

1-4,

CIRCUIT

DESCRIPTION

1-4-1.

When

the

POWER

Switch

turned

(see

Fig.

1):

The

waveform

shaper,

consisting

IC111,

turns

the

voltage

terminal

(3)

IC102

low

level

“0”

half

second

during

which

C112

charged

with

B+

power.

Asa

result,

IC102

reset.

Fig.

S501

(POWER}:

1-4-2.

Arm

Lifter

Raising/Lowering

Circuit(see

Fig.

2):

Turning

the

power

switch

raises

the

arm

lifter.

[Lowering

the

arm

lifter]

When

S508

(UP/DOWN)

depressed,

the

voltage

terminal

(24)

IC102

becomes

high

“1”.

This

turns

the

voltage

terminal

(6)

IC112

positive

and

the

voltage

terminal

(7)

negative.

Asa

result,

Q131

switches

on.

The

potential

the

terminal

(2)

IC112

now

becomes

negative

and

the

output

the

terminal

(1)

goes

positive.

This

turns

Q128

on.

ARM

LIFTER

DOWN

Fig.

-—-7-—

PS-X75

This

means

that

the

microprocessor

(IC102)

does

not

operate

for 0.5

seconds

after

the

power

switch

turned

on.

Also,

buttons

can

effectively

pressed

after

assured

that

the

tonearm

has

been

the

arm

rest

for

about

0.5

seconds.

S501

(POWER):

Since

both

Q128

and

Q131

are

on,

current

passes

through

L505

(lifter

drive

coil)

direction

thus

lowéring

the

arm

lifter.

[Raising

the

arm

lifter]

When

S508

depressed,

the

voltage

terminal

(25)

1C102

becomes

high

“1”.

This

turns

the

voltage

terminal

(7)

IC112

positive,

switching

Q130

on.

Since

Q130

on,

negative

voltage

appears

terminal

(1),

turning

Q127

on.

Now

that

both

Q127

and

Q130

are

on,

current

passes

through

L505

direction

thus

raising

the

arm

lifter.

ARM

LIFTER

ARMLIFTER

DOWN

ARM

LIFTER

ARMLIFTER

DOWN

PS-X75

1-4-3.

Tonearm

Swivelling

Circuit

(see

Fig.

3):

Turning

the

power

switch

returns

the

tonearm

the

arm

rest.

[

BACK]

When

S507

(

BACK)

turned

on,

the

voltages

terminals

(17)

and

(18)

IC102

become

high

“1”.

This

turns

the

voltages

terminals

(6)

and

(7)

IC110

respectively

positive

and

negative.

negative

voltage

then

appears

terminal

(1)

IC110.

FORWARD

1-4-4,

Tonearm

Lifting

Circuit

(see

Fig.

4):

When

the

arm

lifter

lowered

the

zero

balance

are,

Q108

turns

off

because

the

voltage

terminal

(20)

IC102

high

“1”.

result,

varying

RV502

(STYLUS

FORCE:ANTI

SKATING)

causes

change

the

stylus

force.

However,

since

the

voltage

terminal

(23)

IC102

becomes

low

“0”,

positive

voltage

appears

terminal

(1)

I1C109,

turning

Q121

on.

This

causes

current

pass

through

L501

(vertical

drive

coil)

direction

and

lifts

the

tonearm.

This

function

helps

apply

constant

stylus

force

when

the

tonearm

moved

forward

backward,

thereby

preventing

the

arm

from

deflecting.

Also,

since

the

voltage

terminal

(26)

1C102

becomes

low

“0”,

Q133

turns

off.

This

lowers

the

gate

voltage

Q132,

resulting

MFB

current

which

would

otherwise

generate

L502,

with

the

movement

the

tonearm.

When

the

arm

lifter

Fig.

result,

Q125

turns

pass

current

through

L503

(horizontal

drive

coil)

direction

returning

home

the

tonearm.

[<d:

FORWARD]

When

S506

(<:

FORWARD)

turned

on,

the

voltages

terminals

(15)

and

(16)

IC102

become

high

“1”,

This

turns

the

voltage

terminal

(1)

IC110

positive,

and,

consequently,

switches

Q124

on.

Now

that

Q124

on,

current

flows

through

L503

direction

moving

forward

the

tonearm.

lowered

outside

the

zero

balance

area,

Q108

turns

because

the

voltage

terminal

(20)

IC102

becomes

low

“0”.

Asa

result,

varying

RV502

causes

voltage

ranging

from

volts

applied

terminal

(6)

IC109.

negative

voltage

then

appears

terminal

(1),

turning

Q122

on.

Now

that

Q122

on,

L501

has

current

pro-

portional

the

stylus

force

direction

ie]

ARM

LIFTER

DOWN

PS-X75

Q108

ZERO

BALANCE.

STYLUS

FORCE

Og7>39

Tepe

avaoe

HORIZONTAL-

[-D

DRIVE

CIRCUIT

FSO

1C109

oO”

sas

@-O-}>-O+Omn

aie

ote

Mma

1502

iaioe

Com

STYLUS

FORCE

Q122

0133

eae

BALA

©)

tO)

Q132

1C102

oie

1C103

kay

WITHIN

ZERO

;

B-

BALANCE

Fig.

(ARM

LIFTER

DOWN)

1-4-5,

Automatic

Disk

Size

Detector

(see

Fig.

5):

long

the

turntable

rotating,

the

light

from

PLS501

passes

through

the

prism

the

turntable

mat

and

switches

phototransistors

Q501

and

Q502.

The

outputs

Q501

and

Q502

are

fed

termi-

nals

(30)

and

(31)

IC102

used

for

automatic

detection

the

disk

size.

when

record

placed

—--~

when

record

placed:

when

record

___

placed

when

record

placed:

[Nodsk

when

record

plaed:

when

record

paced:

Q502

PL501

B-

Fig.

PS-X75

1-4-6.

Drop-point

and

End

Detection

(see

Figs.

and

7):

When

S504

(AUTO

START)

turned

on,

the

tonearm

moves

toward

the

disk.

The

presence

drop-point

the

disk

deter-

mined

counting

slits

the

movable

shutter

ro-

tating

with

the

tonearm.

The

end

disk

also

detected

counting

slits

the

movable

shutter.

After

detecting

the

end,

the

tonearm

returns.

Slits

are

counted

follows.

The

light

emitted

D401

and

D402

strike

the

movable

shutter.

the

light

from

D401

(D402)

passes

slit,

turns

Q301

(Q302).

The

outputs

Q301

and

Q302

are

fed

the

Schmitt

circuit

consisting

IC103,

where

the

waveforms

are

shaped.

The

shaped

outputs

are

applied

terminals

(32)

and

(33)

IC102.

Also,

whether

the

tonearm

moving

forward

backward

determined

comparing

the

phases

the

signals

from

terminals

(32)

and

(33)

IC102.

fixed

slitA

—

—_

phase

difference:

90°

slit

movable

shutter

—_—

fixed

slitB

slit

| |

{FORWARD)

slitA

| | |

| |

slitB

| |

(BACK)

D401

D402

Fig.

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