Sony D-555 Manual de usuario

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1

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SERVICE

MANUAL

US

Model

D-555

AEP

Model

UK

Model

E

Model

D-2Z555

DISChan

D-=250

CDM-

555

Model

Name

Using

Similar

Mecanism

Tape

Transport

Mechanism

Type

SPECIFICATIONS

CD

section

General

System

Compact

disc

digital

audio

system

Power

requirements

Supplied

rechargeable

sei)

pack

(BP-2EX)

or

BP-100

(optional)

Laser

diode

properties

Material:

GaAlAs

Wavelength:

780

nm

Emission

duration:

Continuous

Laser

output:

Less

than

44.6

pW

This

output

is

the

value

measured

at

a

distance

of

200

mm

from

the

objective

lens

surface

on

the

Optical

Pick-up

Block.

Error

correction

Sony

Super

Strategy

Cross

Interleave

Reed

Solomon

Code

D-A

conversion

16-bit

linear,

8fs

digital

filter

Frequency

response

20

-

20,000

Hz

+1

dB*

Signal-to-noise

ratio

|

More

than

90

dB

Wow

and

flutter

Below

measurable

limit*

Outputs

(at

9

V

input

level)

Line

output

(stereo

minijack)

Output

level

0.7

V

rms

at

50

kilohms

Load

impedance

over

10

kilohms

Optical

digital

output

(optical

output

connector)

Output

level:

-21

—

-15

dBm

Wavelength:

630

—

690

nm

at

peak

level

Headphones

(stereo

minijack)

9

mW

+

9

mW

at

32

ohms

*

Measured

by

EIAJ

CP-307

MICROFILM

DC

IN

9

V

jack

accepts:

Supplied

AC

power

adaptor

for

use

on

120V

AC,

60

Hz

Sony

CPM-200P

car

mount

plate

(optional)

or

Sony

DCC-120A

car

battery

cord

(optional)

for

use

on

12

V

car

battery

Power

consumption

3,2

WDC

Dimension

Approx.

127.6

x

33

x

145

mm

(5

x

15/16

x

5"/16

inches)

(w/h/d)

not

incl.

inclined

part

(depth),

projecting

parts

and

controls

Approx.

130

x

33.8

x

145.5

mm

(5's

x

15/16

x

5/16

ees)

(w/h/d)

incl.

projecting

parts

and

controls

Weight

Approx.

520g

(1.2Ib)

not

incl.

rechargeable

battery

Approx.

600g

(1.5Ib)

incl.

rechargeable

battery

(BP-2EX)

Supplied

accessories

AC

power

adaptor

(1)

Rechargeable

battery

pack

(1)

Carrying

case

(1)

Connecting

cord

(1)

(stereo

miniplug

-

two

phono

plugs)

Design

and

specifications

subject

to

change

without

notice.

Notes

on

AC

power

adaptor

Disconnect

the

AC

power

adaptor

when

the

unit

will

not

be

used.

A

e

Use

only

the

supplied

AC

power

adaptor

or

the

—

recommended

car

battery

cord

manufactured

by

Sony.

Polarity

of

the

plugs

of

other

manufacturers

may

be

different.

Polarity

of

the

Sony

plug

COMPACT

DISC

COMPACT

PLAYER

SONY.

D-555/Z555

|

TABLE

OF

CONTENTS

Section

Title

Page

Specifications:

++++++r

etree

eects

cece

cence

teen

eens

1

1.

GENERAL

Location

and

Fanction

of

Controls:-+:--::++++::

2

2.

SERVICING

NOTES

Notes

on

Handing

the

Optical

Pick-up

Block::

3

Flexible

Circuit

Board

Reparing:::::++:++++++++:

3

Notes

on

Chip

Component

Replacement::++:::++

3

Before

Replacing

the

Optical

Block

-+--:++++++::

3

Notes

on

Laser

Diode

Emission

Check-::-++-++*

4

Laser

Diode

Check

Procedure

--++---++-++++++#+++.

4

Service

Mode

(service

program)

-:++++rsssterrees

5

Section

Title

Page

3.

ELECTRICAL

ADJUSTMENTS:---:-----+++--+++++5:

6

’

4,

DIAGRAMS

4-

i.

Waveforms

errr

e

rere

eee

ee

ee

ee

ee

ay

12;

4-2,

Block

Diagram

-:+s+tstesese

eet

ee

tects

eeees

13

4-3.

Printed

Wiring

Boards—Main

Section—---:

16

4-4,

Schematic

Diagram—Main

Section—-::::::-

21

4-5.

Schematic

Diagram—Servo

Section—::-::::

24

4-6.

Printed

Wiring

Boards—Servo

Section—-:-:

27

4-7.

IC

Block

Diagram

--+++recsceeeeeeeeeeeeeeee

31

5.

EXPLODED

VIEWS.

-

0050+

esiisinsie

ec

cdse

sesamiae

33

G.

ELECTRICAL

PARTS!

LIST

«+

+=isiis's

cscs

sessions

37

SECTION

1

GENERAL

Kd

/

BR

(AMS*/

SEARCH/INDEX)

buttons

@

(stop)

button

OPEN

button

®&

Il

(play/

pause)

button

p,_/_f\_\

PHONES

(headphones)

jack

HOLD

switch

Hee

(stereo

minijack)

KEY

MODE

(locating

mode

select)

button

Front

display

window

Normally

displays

the

track

number

and

the

elapsed

playing

time.

When

the

power

is

supplied

through

the

DC

IN

9V

jack

the

window

will

light

up.

°°

PLAY

MODE

(playing

mode

select)

button

ENTER/REMAIN

button

*AMS

is

the

abbreviation

of

Automatic

Music

Sensor.

“If

lit

for

a

long

time,

the

unit

may

become

warm,

but

that

is

not

a

problem.

EFFECT

(sound

effect

control)

button.

EQ

(graphic

equalizer

band

select

button)

VOLUME

control

buttons

Adjusts

the

sound

from

the

PHONES

jack.

EFFECT

MODE

(sound

effect

mode

select)

button

REMOTE

jack

LINE

OUT

jack

(stereo

minijack)

DC

IN

SV

(external

power

:

OPTICAL

DIGITAL

OUT

input)

jack

connector

Upper

display

window

Normally

displays

the

level

of

the

volume

and

the

left

(L)-and

right

(R)

-

channel.

When

the

power

is

supplied

through

the

DC

IN

9V

jack

the

window

will

light

up.

a

|

D-555/Z555

SECTION

2

SERVICING

NOTES

NOTES

ON

HANDLING

THE

OPTICAL

PICK-

Before

Replacing

the

Optical

Block

UP

BLOCK

Please

be

sure

to

check

thoroughly

the

parameters

: , ;

.

as

par

the

“Optical

Block

Checking

Procedures”

The:

Taser

ioc:

i

the

“opheal

picky

Weck

tay

(Part

No.:

9-960-027-11)

issued

separately

before

suffer

electrostatic

breakdown

because

of

the

poten-

replacing

the

optical

block.

tial

difference

generated

by

the

charged

electrostatic

Note

and

specifications

required

to

check

are

given

load,

etc.

on

clothing

and

the

human

body.

: ;

;

below.

During

repair,

pay

attention

to

electrostatic

break-

down

and

also

use

the

procedure

in

the

printed

e

FOK

output:

IC501

Q)

pin

matter

which

is

included

in

the

repair

parts.

When

checking

FOK,

remove

the

lead

wire

to

disc

motor

and

unsolder

and

open

IC801

pin.

®

Scarve

P-to-P

value:

2.95

Vp-p

e@

Adjusted

part

for

focus

gain

adjustment:

RV505

Flexible

Circuit

Board

Repairing

©

RE

signal

P-to-P

value:

0.75

—

1.4

Vp-p

1.

Keep

the

temperature

of

the

soldering

iron

at

©

Traverse

signal

P-to-P

value:

1.8

Vp-p

270°

10°C

during

repairing.

@

The

grating

holder

can

not

repair.

2.

Do

not

touch

the

soldering

iron

more

than

4

e@

Adjusted

part

for

tracking

gain

adjustment:

RV501

seconds

or

3

times

on

the

same

conductor

of

the

circuit

board.

3.

Do

not

apply

force

on

the

conductor

when

soldering

or

unsoldering.

Notes

on

chip

component

replacement

@

Never

reuse

a

disconnected

chip

component.

®

Notice

that

the

minus

side

of

a

tantalum

capacitor

may

be

damaged

by

heat.

SAFETY-RELATED

COMPONENT

WARNING!!

COMPONENTS

IDENTIFIED

BY

MARK

A

OR

DOTTED

LINE

WITH

MARK

A

ON

THE

SCHEMATIC

DIAGRAMS

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

PUB-

LISHED

BY

SONY.

D-555/Z555

|

NOTES

ON

LASER

DIODE

EMISSION

CHECK

The

laser

beam

on

this

model

is

concentrated

so

as

to

be

focused

on

the

disc

reflective

surface

by

the

objec-

tive lens

in

the

optical

pick-up

block.

Therefore,

when

checking

the

laser

diode

emission,

observe,

from

more

than

30cm

away

from

the

objective

lens.

Laser

Diode

Check

Procedure

The

laser

diode

on

this

set

will

not

emit

unless

the

top

panel

is

closed

and

S901

(leaf

SW

type)

is

turned

on.

The

laser

diode

will

always

emit

even

if

focus

search

is

not

performed

in

service

mode.

The

laser

diode

is

checked

using

the

current

value

which

flows

to

the

laser

diode

inside

the

UPF.

Procedure

1

(service

mode

or

normal

operation)

Check

the

laser

diode

emission

with

the

eye.

1.

Open

upper

panel.

2.

$901

onas

Fig.

1.

(In

service

mode,

this

operation

is

not

neces-

sary.)

3.

Pressthe

PI

key.

(In

service

mode,

this

operation

is

not

neces-

sary.)

4.

Observe

the

objective

lens

and

confirm

that

the

laser

diode

is

emitting

light.

At

this

time,

the

laser

diode

goes

on

about

10

seconds

due

to

focus

serarch.

If

it

does

not,

APC

circuit

or

UPF

is

defective.

$901

Fig.

1

Turning

S907

on

Procedrue

2

(service

mode

or

normal

operation)

Check

by

the

curent

with

flows

in

the

laser

diode.

1.

Close

the

top

panel,

2.

Remove

the

main

board

and

read

the

current

value

on

the

label

affixed

to

the

UPF.

(Label

on

UPF)

KSS-167B

JAPAN

S

123

current

value

This

means

49.9

mA.

The

current

value

varies

with

the

set.

3.

Connect

a

VOM

as

shown

in

Fig.

2.

4.

Press

the

PJ

key.

5.

Calculate

the

current

by

the

VOM

reading.

VOM

reading

(V)

+

10

=

current

(A)

ex.

VOM

reading

=0.49

V

0.49

+

10

=

0.049

(A)

=

49

(mA)

6.

Confirm

that

the

ammeter

reading

is

within

the

range

given

below.

value

on

label*?,

mA

(25°C)

variation

relative

to

temperature:

0.4

mA/°C

(Current

increases

when

temperature

rises

and

decreases

when

it

drops.)

If

the

value

is

more

than

the

range

given,

APC

circuit

has

been

defective

or

the

laser

diode

has

deteriorated.

If

it

is

less,

APC

circuit

or

UPF

is

defective.

—

servo

board

—

VOM

(dc

3

V

range)

Fig.

2

VOM

Connection

SERVICE

MODE

(service

program)

This

set

has

built-in

service

program

in

the

micro-

computer

as

usual

sets.

The

operation

method

of

service

program

is

ex-

plained

below.

[ads

Main

operation

in

service

mode

for

details,

refer

to

step

2.

@

(STOP)

[servo

all

off]

PIL

(PLAY/PAUSE)

he

OCUS

on

and

CLV-S

]

mode

(RUN-UP

mode)

on

PPI(FF)

el

goes

to

ou

ieee)

circum

ference.

Be

KEY-MODE

Hi

144(FR)

tracking

servo

=a

OFF

«ON

ere

goes

to

jai)

sled

servo

on

REMAIN

circumference.

(display

stop]

Be

sure

to

set

HOLD

switch

OFF.

If

not

key

inputs

can

not

be

operated.

Fig.

3

Key

Positions

Step

1

(Service

Mode

setting

method)

1.

Turn

the

HOLD

switch

OFF

with

the

external

power

supply

not

plugged

in

(no

power

applied

to

set)

and

press

the

PUT

key.

2.

Solder

jumper

TEST

point.

(IC801

pin

(9)

(BAT-E)

pin

is

grounded.

3.

Plugin

external

power

supply.

This

puts

the

set

into

service

mode.

—

main

board

—

L

|

D-555/Z555

Step

2

(Service

Mode

operation)

1,

When

service

mode

is

set,

the

display

will

change

6

times,

and

those

6

changes

will

be

repeated

over

and

over.

With

this

the

LCD

display

should

be

present

in

service

mode,

Even

if

LCD

does

not

display,

other

operations

will

be

performed.

2.

When

DP

or

Kd

key

is

pressed,

the

UPF

moves

to

the

inside

or

outside

circumference.

Tracking

servo

and

sled

servo

go

off

when

this

is

done,

so

press

KEY-MODE

to

turn

on

the

tracking

servo

if

necessary.

3.

When

REMAIN

is

pressed,

the

display

stops.

When

REMAIN

is

released,

the

display

con-

tinues

to

change.

This

allows

check

of

each

segment.

4.

When

Pil

key

is

pressed,

CLV-S

(pull-in

mode)

starts

while

performing

focus

search.

When

there

is

no

disc

installed,

focus

search

is

re-

peated

several

times

while

disc

motor

is

rotating.

5.

When

KEY-MODE

is

pressed,

tracking

servo,

sled

servo

and

CLV-A

(servo

during

PLAY)

go

ON.

6.

When

4

and

5

are

performed,

the

disc

begins

to

play.

At

this

time,

the

top

panel

should

be

closed

and

S901

are

to

be

ON.

7.

All

servo

(focus,

tracking,

sled

and

spindle)

go

off

when

M

key

is

pressed.

But

disc

motor

continues

rotating

for

a

while

by

inartia.

Step

3

(Service

Mode

release)

1,

First

be

sure

to

unplug

the

external

power

supply,

then

remove

the

TEST

point

solder

jumper.

2.

The

set

will

now

operated

normally.

TEST

Solder

jumper

for

service

mode.

sited

checking

or

adjusting

in

service

a

be

sure

to

remove

this

solder

jumper.

i

24

fa

-

e

st.

a

eS

&*

sas

®@

p07

Cal4

obs

330K)

=

°

feel

-

ee

ee

ae

&

.

Mis

}

oir

a4

fo

--y

om

DiS

Re3

sy

38

“=

©

co"

Sl

pqaedt

st

8

1

a

a4

=e

e

wie

BEE4

©

\

e

be

s e

weee

Glass

@

ses

=

9822

ra

“

g

Eh

teg?

AVEO

as

Sd

BES

ee.

=

AKO

Ds,

ie

=

Rete

ms

1

See

J

P&S

2

og

a

Sq

|

heb

23

a

ae

S

=

©

®

a2

=f]

Mm

Fig.

4

TEST

Point

Position

_5—

D-555/Z555

|

SECTION

3

ELECTRICAL

ADJUSTMENTS

Notes

on

Adjustment

iV

ty

Perform

adjustments

except

for

RECHARGEA-

BLE

VOLTAGE

ADJUSTMENT

and

BATTERY

DISPLAY

ADJUSTMENT

in

service

mode.

Be

sure

to

release

service

mode

after

completing

adjustment.

(Refer

to

‘Service

Mode

(service

program)’’

on

page

5.)

.

Perform

adjustments

in

the

order

given.

.

Use

YEDS-18

disc

(part

No.:

3-702-101-01)

unless

otherwise

indicated.

.

Power

supply

voltage:

DC

9

V

HOLD

switch:

OFF

PREPARATION

Put

the

set

into

service

mode

(see

page

5)

and

per-

form

the

following

checks.

Repair

if

there

are

any

abnormalities.

I.

7

“

nN

Sled

Motor

Check

Press

the

OPEN

button

and

open

the

top

panel.

.

Press

thep>P|

,

Kd

keys

and

make

sure

that

the

UPF

moves

smoothly,

without

catching,

from

the

inmost

~

outmost

>

inmost

circumference.

p>

:

UPF

moves

outward

kd<q

:

UPF

moves

inward

Focus

Search

Check

.

Press

the

OPEN

button

and

open

the

top

panel.

.

Press

the

P¥B

key.

(Focus

search

is

performed

continuously.)

.

Observe

the

UPF

objective

lens

and

check

that

it

moves

smoothly

up

and

down

with

no

catching

or

noises.

.

Press

the

Mf

key.

Check

that

focus

search

operation

stops.

If

it

does

not

stop,

press

the

Ml

key

again

longer

than

before.

But

disc

motor

continues

rotating

for

a

while

by

inartia.

VC

(1/2

Vcc)

Connecting

Point

FOCUS

BIAS

ADJUSTMENT

TRACKING

BALANCE

ADJUSTMENT

When

the

adjustments

above

are

performed,

connect

the

O

side

of

oscilloscope

to

the

point

below.

oscilloscope

to

adjustment

Point

10

lt

:

001/50.(2)

C543

Bz

c

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Bis

see

sohl

wwe

R54

35.0

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Fe)

9802

ea

s

ire}

e

°

cso3ae)

@

Jt

90012750

13%

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2goP75o

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Ad

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Fats

Q

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K

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|

GerAases

|

D-555/Z555

Battery

Display

Adjustment

+6

V

Adjustment

Adjustment

Procedure:

VOM

Adjustment

Procedure:

VOM

(de

range)

(de

range)

main

board

P|

main

board

|

|

+

TP

(VREF)

0-1.

IP

196

Vi9w———

6

10802

(3)

O=--/

1.

Put

the

set

into

service

mode

(see

page

5).

2.

Connect

the

VOM

to

main

board

TP

(+6

V).

3.

Adjust

RV401

for

+6+0.1

V

reading

on

the

VOM.

1.

Apply

dc

+3.5

V

to

terminals

for

bult

in

battery

(BP-2).

2.

Insert

the

disc

(YEDS-18)

and

put

the

set

into

play

mode.

3.

Adjust

RV801

so

that

main

board

IC802

(i)

voltage

and

TP

(VREF)

voltage

are

equal.

4.

If

1C802

a)

voltage

is

heigher

than

TP

(VREF)

voltage

when

turning

the

RV801

fully

counter-

clockwise,

short

the

jumper

point

(A)

as

shown

below

and

adjust

RV801.

Adjustment

Location:

main

board

4.

After

adjustment,

release

service

mode

(see

page

5).

Adjustment

Location:

main

board

battery

terminals

TP(+6V)

TP

(VREF)

~

°

1C7504@-TEBSR

dig

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~

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0.001750

(SL)

FF}

330P/50

(SL)

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+4,

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o°°

(34)

"fad

cars

{

VREF)

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yet

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£805

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D-555/Z555

|

+3.4

V

Adjustment

Rechargeable

Voitage

Adjustment

VOM

(de

range)

VOM

(de

range)

main

board

|

|

main

board

||

+

Adjustment

Procedure:

Adjustment

Procedure:

TP

(+3.4

V)

TP

(R.

ae

4

;

1,

Put

the

set

into

service

mode

(see

page

5).

1,

Connect

the

VOM

to

main

board

test

point

TP

2.

Connect

the

VOM

to

main

board

test

point

TP

(R.V).

(+3.4

V).

2.

Apply

DC

9V

with

requrated

de

power

supply

3.

Adjust

the

pattern

connecting

(

@

or

©)

to

from

external

power

jack

CN401.

obtain

3.4

to

3.55

V

reading

on

the

VOM.

3.

Adjust

RV402

for

7.05

—

7.5

V

reading

on

the

VOM.

VOM

reading

Note:

Measure

after

the

VOM

reading

becomes

stable.

down

Adjustment

Location:

main

board

O:

short

XX:

open

4.

After

adjustment,

release

service

mode

(see

page

5).

Adjustment

Location:

main

board

LIS@.

ooiy50

81)

lu

ASB

1038x7714

oni

0-oSPcP-I6

i

gd

040)

aoi/s0

st)

*

be

Sec?

2m

la

9202

78

e

€+|>

ef

rs

A

a

ee

ce

{Re¥)

es

|

Chat

0@001/50

(SL)

TP(R.V)

PLL

Free

Run

Frequency

Check

and

Adjustment

Check/Adjustment

Procedure:

frequency

counter

servo

board

=

as

os

cuumee

.

Disconnect

the

jumper

point

@)

(EFM)

in

the

diagram

below.

.

Connect

a

frequency

counter

to

servo

board

test

point

TP

(PLCK).

3.

Put

the

set

into

service

mode

(see

page

5);

.

Check

that

the

frequency

counter

reading

is

4.3218

+0.01

MHz.

If

not,

adjust

RV504

so

that

it

is

4.3218

+0.01

MHz.

.

After

adjustment,

release

service

mode

(see

page

St

6.

Short

the

jumper

point

shorted

in

step

1.

Cheek/Adjustment

Location:

servo

board

e

®eaeneee,

SXBL1T

2S

EFM

solder

jumper

point

Disconnect

for

checking

an

[eciestmen

t.

Short

after

checking

and

adjustment.

6.04/25

(B)|

7

|S

2g0P/50

{SL}

ay

PAde

EFM

solder

jumper

point

——

|

“F655

9S

050

5

|

D-555/Z555

Tracking

Balance

Adjustment

Conditions:

The

set

should

be

placed

either

horizontally.

oscilloscope

Adjustment

Procedure:

(DC

range)

servo

board

TP

(TE)

eS

i

+

VC

(1/2

Vec)

0m

—

(See

page

6.)

1.

Connect

the

oscilloscope

to

servo

board

TP

(TE).

2.

Put

the

set

into

service

mode

(see

page

5).

3.

Press

the

PPI

and

44

keys

to

move

the

UPF

to

the

center.

4.

Insert

the

disc

(YEDS-18)

and

close

the

top

panel.

5.

Press

the

PBN

key.

It

will

go

from

focus

search

to

focus

on,

and

CLV

pull-in

mode

state.

Tracking

and

sled

are

OFF.

.

Adjust

RVS0O2

so

that

the

oscilloscope

waveform

is

symmetrical

on

the

top

and

bottom

in

relation

toOV.

Note:

Take

sweep

time

as

long.as

possible

to

obtain

best

waveform.

A

A

1.3—2.3

Vp-p9V

a

|

B

A=B

A=8

.

Unplug

the

external

power

supply

to

stop

spindle

motor

from

rotating.

.

After

adjustment,

release service

mode

(see

page

SD

Adjustment

Location:

servo

board

ce

i}

terpedia

[YS

S545

o

ae

te

i

wn

Sie

eee

wu

exit

a

502

(FED

TOES

§

(Te)

e

a

@csost

e@

|

#8

0.0012/50

tas

e

01/25

(B)

x

3

2gvWPED

(aL

50

GE}

D-555/Z555

|

Focus

Bias

Adjustment

Conditions:

The

set

should

be

placed

either

horizontally.

Adjustment

Procedure:

oscilloscope

(DC

range)

servo

board

C)

Le

2k2

(RF)

O——"——O

+

Vc

(1/2

Vcc)

O=———_©

-

(See

page

6.)

oscilloscope

(DC

range)

O

1C502

@8)

(FE)

+

VC

(1/2

Vec)

!

=

(See

page

6.)

servo

board

.

Put

the

set

into

service

mode

(see

page

5).

.

Connect

the

oscilloscope

to

servo

board

test

point

TP

(RF).

.

Press

the

PPI

and

M4

keys

to

move

the

UPF

to

the

center.

(Move

the

UPF

to

the

music

area

on

the

disc

to

enable

easy

visibility

of

the

eye

pat-

tern).

.

Insert

the

disc

(YEDS-18)

and

close

the

top

panel.

.

Press

the

P&B

key.

It

will

go

from

focus

search

to

focus

on,

and

[cuv

pull-in

mode

state.

Tracking

and

sled

re)

OFF.

.

Press

the

KEY-MODE

button.

(Tracking

and

sled

go

ON.)

.

Adjust

RV503

so

that

the

oscilloscope

waveform

eye

pattern

is

good.

A

good

eye

pattern

means

that

the

diamond

shape

(©)

in

the

center

of

the

waveform

can

be

clearly

distinguished.

RF

Signal

Reference

Waveform

(eye

pattern)

VOLT/DIV:

200

mV

TIME/DIV:

500nS_

\

RNIN

_

KKK

KAALKAY.

|

B6de%

og

y

MA

A)

0.1

V

-

Push

the

Hi

(STOP)

button

spindle

motor

from

rotating

and

remove

the

disc.

.

Remove

the

disc

and

connect

the

oscilloscope

to

main

board

IC502

@8)

(FE).

.

Adjust

RV503

again

refering

to

the

table

followed.

more

than

+50

mV

|

Not

adjust

again.

+50

mV

~

+20

mV

Adjust

RV503

again

for

+50

mV

reading

on

oscilloscope.

+20

mV

~

—20

mV

Adjust

RV503

again

for

-20

mV

reading

on

oscilloscope.

11.

After

adjustment,

release

service

mode

(see

page

5).

Adjustment

Location:

servo

board

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