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TEAC,

SERVICE

MANUAL

VRDS-20

Compact

Disc

Player

COMPACT

DIGNAL

AUDIO

Effective

:

March,

1993

574064200

VRDS-20

1

SAFETY

INFORMATION

[

SAFETY

INFORMATION

This

product

has

been

designed

and

manufactured

according

to

FDA

regulations

“title

21,

CFR,

chapter

1,

subchapter

J,

based

on

the

Radiation

Control

for

Health

and

Safety

Act

of

1968”,

and

is

classified

as

class

1

laser

product.

There

is

not

hazardous

invisible

laser

radiation

during

operation

because

invisible

laser

radiation

emitted

inside

of

this

product

is

completely

confined

in

the

protective

housings.

The

label

required

in

this

regulation

is

shown

(1).

CAUTION

2

@

If

you

remove

the

above-mentioned

housings

under

the

operating

state

of

the

product,

there

is

a

possibility

of

human

access

to

the

invisible

laser

radiation

emitted

from

the

optical

pickup.

Pay

careful

attention,

not

to

let

the

invisible

laser

beam

enter

into

your

eyes.

@

If

you

find

a

troubled

state

of

the

laser

diode,

change

to

the

specified

new

optical

pickup.

@

If

you

find

a

troubled

state

of

safety

interlock

parts,

change

to

the

same

type

parts

described

in

parts

list.

®

CERTIFICATION

THIS

PRODUCT

COMPLIES

WITH

DHHS

RULES

21

CFR

SUBCHAPTER

J

APPLI-

CABLE

AT

DATE

OF

MANUFACTURE.

TEAC

CORPORATION

3-7-3

NAKA-CHO

MUSASHINO-SHI

TOKYO,

JAPAN

MANUFACTURED

uF

Optical

pickup:

Type

:

KSS-151A

Manufacturer

:

SONY

Corporation

Laser

output

:

Less

than

0.2

mW

on

the

objective

lens

Wavelength

:

760-800nm

*

CAUTION

*

ACHTUNG

*

OBSERVERA

*

ADVARSEL

®

THIS

LABEL

1S

ATTACHED

TO

THE

PLACE

AS

ILLUSTRATED

TO

INFORM

THAT

THE

+

Hawise

LASER

mADAtION

WHEN

OPEN

AND

APPARATUS

CONTAINS

A

LASER

COMPONENT.

INTERLOCKS

DEFEATED

AVOID

EXPOSURE

TO

BEAM

UNSICHTBARE

LASERSTRAMLUNG

TOITT

AUS,

NN

CGF

NET

UND

WEN!

Stone

ter

SvEWIWE

GELUNG.

Uae

ROALCKT

1st

NICHT

DEM

STRAHL

AUSSCTZEN'

AR

OFPSAD

OLN

SPAR

AR

URROOPAD

(4)

DIESE

AUFKLEBEMARKE

IST

AN

DEM

IN

DER

ABBILDUNG GEZEIGTEN

ORT

STRALEN

AR

FARLIG

ANGEBRACHT

UM

DARAUF

HINZUWEISEN,

DASS

IM

INNERN

DES

GERATS

EINE

LASER-KOMPONENTE

BEFINDET.

'

‘o

PASKRIFTEN

SITTER

PA

APPARATEN

SOM

VISAS

SOM

UPPMANING

OM

ATT

APPARATEN

OMFATTAR

EN

INBYGGD

LASERKOMPONENT.

AQVARSEL,

USYNLIG

LASERSTRALING

VED

ABMING,

WA

six

TUDE

AP

FUNK

TION

Geuin

O0oe

FTELSE

FON

SHAKING

NARDIVIS!

-SUOIARDTSEO

ASA

AUNT

LATS

BSA

FIIQOIN

JOKA

LAMETTAA

(AK

YMATONTA)

SUMALLE

VAARALUISTA

CASERSATERYA

ADVARSEL

USYMLIG

LASERBESTRALING

NAR

DENNE

DELEN

ER

|SSPERREN

ER

UTKOBLET

CRMGA

UISETTECSE

FO

STRIALING

‘o

DETTE

M/ERKAT

ER

ANBRAGT

SOM

VIST

|

ILLUSTRATIONEN

FOR

AT

ADVARE

BRUGEREN

OM

AT

APPARATET

INDEHOLDER

EN

LASERKOMPONENT.

@®

2)

DETTE

M/ERKAT

ER

SOM

VIST

PA

ILLUSTRATIONEN

ANBRAGT

PA

INDERSIDEN

AF

TOPD/EKSLET

FOR

AT

ADVARE

BRUGEREN

OM

AT

YDERLIGERE

FREMTRAENGEN

VIL

VERE

FORBUNDET

MED

FARE

FOR

AT

UDS/ETTE

SIG

FOR

LASERSTRALING.

ADVARSEL

—

BETJENING

AF

ANDRE

KONTROLLER

OG

REGULATORER

ELLER

BENYTTELSE

AF

ANDRE

FREMGANGSMADER

END

BESKREVET

HERI

ER

FOR-

id

BUNDET

MED

FARE

FOR

UDSAETTELSE

FOR

LASERSTRALING.

VARNIG:

APPARATEN

INNEHALLER

LASER

KOMPONENT

MED

STRALNING

OVERSTIGANDE

KLASS

1

“ADVARSEL:

USYNLIG

LASERSTRALING

VED

ABNING

NAR

SIKKERHEDSAFBRYDERE

ER

UDE

AF

FUNKTION.

UNDGA

UDSAETTELSE

FOR

STRALING”

"VAROITUS!

SUQJAKOTELOA

EI

SAA

AVATA.

LAITE

SISALTAA

LASERDIODIN.

JOKA

LAHETTAA

(NAKYMATONTA)

SILMILLE

VAARALLISTA

LASERSATEILYA’.

ADVARSEL:

USYNLIG

LASERBESTRALING

NAR

DENNE

DELEN

ER

APEN

OG

SIKKERHETSSPERREN

ER

UTKOBLET

UNNGA

UTSETTELSE

FOR

STRALING.

CLASS

1

LASER

PRODUCT

LUOKAN

1

LASERLAITE

KLASS

1

LASE?APPARAT

AUDIO

Number

of

Channels

2

SPECIFICATIONS

ft

Ee

2

Frequency

Response

1

—

20,000Hz

+

0.3dB

(RCA)

Signal

to

Noise

Ratio

Dynamic

Range

Harmonic

Distortion

Wow

and

Flutter

Channel

Separation

Output

Analog

Digital

D/A

Converter

Digital

Filter

Analog

Filter

PICK

UP

Type

Objective

Lens

Laser

Type

Wave

Length

SIGNAL

FORMAT

Sampling

Frequency

Quantization

Bit

Channel

Bit

Rate

20

—

20,000Hz

+

0.5dB

(XLR)

Better

than

110dB

(1kHz)

Better

than

99dB

(1kHz)

0.0013

%

(1kHz)

Unmeasurable

(Quartz

accuracy)

Better

than

110dB

(1kHz)

2.2Vrms

(RCA)

2.3Vrms

(XLR)

0.5Vp-p/75

Q

(Coaxial)

-15dBm

—~21dBm

(Optical

;

TOS)

-12.5dBm

—-15dBm

(Optical

;

ST)

Bitstream

Conversion

8-times

oversampling

20-bit

digital

filter

3rd

order

Butterworth

filter

Optical

3-Beam

laser

pickup

2-dimensional

parallel

drive

GaAlAs

type

semiconductor

laser

780nm

44.1

kHz

16-bit

linear/

channel

4.3218Mb/sec

Channel

Modulation

Code

Error

Correction

GENERAL

Power

Requirements

Power

Consumption

EFM

(Eight

to

Fourteen

Modulation)

CIRC

(Cross

Interleave

Reed

Solomon

Code)

120/230V

AC,

50-60Hz

(U.S.A./

Canada/

General

Export

Model)

230V

AC,

50Hz

(Europe

Model!)

240V

AC,

50Hz

(U.K.

Model)

22

watts

Dimensions

(W

x

H

x

D)

Weight

(net)

500

x

146

x

331mm

(19-11/16"

x

5-3/4"

x

13-1/16"

)

13.8kg

(30-7/16

Ibs)

Standard

Accessories

Wireless

Remote

Control

Unit

(RC-481

;

for

Gold

finish

version

/RC-495;

for

Black

finish

version),

Battery

(SUM-3,

“AA”,

“R6”"

type)

x

2,

Lock

Plate,

Foot

Base

x

4

@

improvements

may

result

in

specification

or

feature

changes

without

notice.

(A-F

4

7)

A-Frx

AF

VRE

Bpestoaed

SN

EE

FAFRVIVYY

ARES

a

i

hoe

Fe

VRIVEIND-Yay

FFOTHA

FUNDA

DSA

DYIN-F-

FUINDANG—

PFFOAI4N9—

(Ex

IP

uv)

AX

WL

VY

ARHAX

bint]

RE

25

74—Vvy

b)

AER

Btitty

hx

ini&

LY

—

b

RRAX

L5—asTIEAHX

(AX)

Ek

BRED

WME

TE

28

Raa

VRDS-20

2F

ev

VAIL

1~20,000Hz

+

0.3dB

(RCA)

20~20,000Hz

+

0.5dB

(XLR)

110dB

ELE

CEIAJ)

Q9dB

LIF

(EIAJ)

0.0013

%ELF

CEIAJ)

AVE

RR

RB

Okan

ita)

110dBLiE

(EIAJ)

2.2Vrms

(RCA)

2.3Vrms

(XLR)

0.5Vp-p/75

Q

(COAXIAL)

-~

15~-

21dBm

(OPTICAL

TOS)

—

12.5~-

15dBm

(OPTICAL

ST)

Ey

bARU-L

BEA-N-TUPUYT

20Ey

KF

YIN

D

4a

SRNI-D-AD4NW9—

HL

ASB,

HPKBE-L

2

ARTETA

BRL

Yt

780nm

44.1kHz

Ey

hk

UDP/F

eR

4.3218Mb/sec

EFM

CIRC

100V

AC

50-60Hz

18W

500

x

146

x

331mm

(W

x

Hx

D)

13.8kg

@e71VLAVEAY

RC-481

@

8

Bit

B3,

SUM-3)

x2

@nx77L-+t

@7ybkX-A2x4

ORAS

*

CBRE

KUSH,

DESOTO

PES

BETS

CLM)

ET.

VRDS-20

3

CASE

AND

FRONT

PANEL

REMOVAL

HEB

an

OLA

number-o

emble

in

Disass

BSMRCHLT

¢

EA

VRDS-20

_

4

ADJUSTMENT

AND

CHECKS

aa

ae

t

HERS

1.

Replacement

of

the

pickup

assembly

@

Before

removing

the

pickup

assembly

be

sure

to

solder

-bridge

where

indicated

in

the

inset

(Fig.

4-1)

to

prevent

the

laser

diode

from

being

electrostatically

damaged.

After

replacing

the

pickup

assembly,

be

sure

to

unsolder

the

antistatic

bridge.

Or

else

the

laser

diode.does

not

function.

@

Before

servicing

the

pickup

assembly

be

sure

to

prevent

electrostatic-inducer

destruction

by

grounding

not

only

test

equipment

in

use

but

also

yourself

as

shown

in

Fig.

4-2,

*

Electrostatic

charge

drastically

shortens

the

operating

life

of

the

laser

diode

or

possibly

results

in

its

destruction.

@During

the

transportation,

mounting

and

dismounting

of

the

assembly,

support

with

your

fingers

at

points

A

and

B

as

shown

in

Fig.

4-3.

Be

particularly

careful

not

to

touch

the

actuator,

photosensor

and

LD

plate

and

do

not

apply

force

to

them.

@Don't

touch

the

plated

portion

of

the

flat

cable

end

directly

with

fingers.

@Use

care

not

to

break

the

flat

cable.

@Soldering

must

be

done

quickly

at

less

than

30W,

320°C.

@Don't

disassemble

the

pickup

ass’y.

@Don't

apply

shock

to

the

pickup

ass’y.

@Don't

place

the

assembly

in

a

place

subject

to

excessive

dust,

heat

or

moisture.

2.

Objective

@lLaser

beams

are

similar

to

infrared

rays.

Don’t

look

at

the

beams

directly

and

keep

your

eyes

at

least

30cm

away

from

them.

@Don't

touch

the

objective

with

fingers.

@If

objective

becomes

dirty,

playback

will

deteriorate.

To

clean

the

objective,

moisten

a

good

cleaning

tissue,

such

as

made

by

KODAK,

in

isopropy!

alcohol

and

wipe

the

objective

gently.

Wipe

off

and

excess

fluid

with

a

dry

cleaning

tissue.

Earth

ring

(Lead

wire)

Pick-up

case

Chassis

(GND)

Earth

Fig.

4-2

1b

y97

17

ASSY

OZR

@eyr

IT

vTSASSY

FEAF

ERI.

VAP

AA

PORS

DERDIL

ORD,

BRS

(Fig.

4-1)

24M

TY

y

YLT

DOVBELTCR

AW.

Ek.

MOU

SBR

OM

hhh

ICHAT

y

VEALTCR

MID)

y

VALHEEE

CML

AF-S

4a

Fide

lL

EE

Ao

@LYVITITASSY

EMYORIBSU.

MER

CMB

F-AEMAZEHI.

MAT

-AZEAOW,

BBR

TOME

LT<

HAW,

(Fig.

4-2)

KL-F-VAA-—

KA,

MBAWMDS

&

HOB

AEF

LED,

EVIE

LET

OCLHERBLTC

KS.

ORO,

ROAL,

HEMUORIL,

Fig.

4-3SD

AME

BM

CHATS

HEY,

B77

Fazt—-F7—-,

HREM,

LDF

V—bmRid,

FRANEOWEMAKY

LIEWEC

KEW

OVI

VhTA-FNVEBO

X y

HRS}

UV

EL

BEE

HART

TL

US

¢

TEKW

OPT

IKTH-TFHNisNET

OO

CHIERE

L

THER

LTS

TES

WG

@

HAF

IL380W,

320°CEL

FHIBHIL.

SIS

<

MEBL

TC

KS

Wo

@EYVIT

YTASSY

AAKORMBS

KODE

EV

LEWECK

Sv,

@EYITYTASSY

IBF

+

HBRUMABEK

KAW.

@2ti

-KIVREORET

Zim,

Rik

SMO

LHY

T

CHEWS

Resistor

IMQ~10MQ

LO

Plate

Photosensor

Fig.

4-3

2.

dL

vy

Z(ICDWT

OL

—F-HILLATAROAAHMILRHTT.

HORBEOA,

A

AVY

APS

30cm

LEBEL

TK

KEV,

@VVAIILFEMNEUES

CHEW,

@LVVALIENANE

¢

&CHEREFIAVR

FL

EG

OC,

ROLZK

fat#

UTC

TER,

VY

AIY-aYVIR—-S—

(KODAK

HH

EY)

KL

fv

o

E-IWPVIA-W

(LP.A)

BRL

CHS

LL

RAR

Ok

DIB

RSE

ETCH

EWS

|

VRDS-20

|

3.

Laser

diode

check

(lop

(Intensity

Optimum)

check)

Connect

a

DC

voltmeter

to

both

ends

of

R407

on

SERVO

PCB.

Measure

the

DC

voltage

while

playing

a

disc

to

check

that

the

measured

value

does

not

exceed

the

lop

value

indicated

on

the

pickup

by

10mA.

(I=

measured

value/22}

If

the

measured

value

is

higher

than

that

indicated,

the

pickup

may

be

damaged.

*

Pay

special

attention

that

parts

are

not

damaged

by

static

electricity.

@How

to

read

numbers

on

sticker

attached

to

the

pickup

(Example)

KSS-151A

11191

646

Serial

No.

lop

value

64.6mA

DC

voltmeter

3.

-¥-Y44A-—

kK

OWBF

x

7

(lop

(intensity

Optimum)

(BFE)

(Ey

7

Ty

SIAR

SP

RITO

CE)

DC

RIVE

X-F-XSERVO

PCB

®

R407

O

lyn

ic

hexe

sd

4.

PLAY

POMRBL

MEL.

CORED

6

mR

LK

(1

=

gu

IE

/

22)

Dey

77

vy

SCRRETHS

lop

fiik

0

TOMALLEMIMNL

TORO

LC

ERMERT

5.

MIMNOWAI.

WHA

UTS

BHEPED

5

Se

xR

TERT

SIL.

OCs

IT

vy

TRAY

-NORAA

(Fil)

KSS-151A

11191

646

YY

FILNo.

lop

{8

64.6mA

SERVO

PCB

4.

Anti-shock

bracket

To

protect

the

laser

pickup

mechanism

from

shocks

and

movement

during

transit,

it

is

secured

by

a

special

anti

-shock

bracket.

Before

starting

operation,

be

sure

to

release

this

bracket,

which

is

accessed

from

the

bottom.

4.

ARREST

AAEM

GORDO

S

Cy

77

y

TERS

tev,

Be

LTH

VET.

AMEMIES

USES,

BRE

LTC

HRS

ects

a

y

ag

e

|

wien

|

VRDS-20

_

4-1

SERVO

ADJUSTMENT

4-1

+I

TEST

DISC:

YEDS-18

or

MCD-111

(Except

4-1-6

and

FAKFIAD:

YEDS-18#KILMCD-111

(4-1-6HkO

4-1-7)

4-1-7

€BRS)

V404

R407

V405

|

F.GAIN

|

v401

aS)

1

TP1

V402

[*

|

[6{

GNO

|

SERVO

PCB

Fig.

4-6

VOLTAGE

CONVERSION

Be

sure

to

remove

the

power

cord

from

the

AC

outlet

before

repositioning

the

voltage

converter

switch.

1.

Locate

the

voltage

selector

on

the

rear

panel.

2.

Using

a

flat-bladed

screwdriver,

set

to

the

appropriate

230

V

or

120

V

position

according

to

your

area.

VOLTAGE

SELECTOR

230V

(a)

120V

VRDS-20

|

4-1-1

Checking

the

pickup

actuator

operation

Before

loading

the

disc,

turn

the

power

ON

and

check

that

the

pickup

actuator

moves

up

and

down

three

times.

(If

the

pickup

is

not

at

inside

on

the

disc,

perform

the

above

operation

after

moving

the

pickup

to

the

inside.)

4-1-2

Sled

balance

adjustment

1.

Adjust

V405(S.BAL)

for

OV

potential

between

TP4

pin

1

and

TP4

pin

2(GND).

4-1-3

Tracking

balance

adjustment

1.

Connect

the

oscilloscope

between

TP1

pin

4(TE1)

and

TP1

pin

6(GND),

and

press

the

SEARCH

(<4orP>

)

button.

2.

Adjust

V401(T.BAL)

so

that

the

upper

and

lower

amplitudes

of

the

tracking

error

signal

waveform

become

equal

above

and

below

OV.

4-1-4

Focus

balance

adjustment

1.

Connect

the

oscilloscope

between

TP1

pin

5(RF)

and

TP1

pin

6(GND).

2.

In

the

play

mode,

and

adjust

V402(F.BAL)

so

that

the

waveform

on

the

oscilloscope

becomes

maximum.

00404

WILY)

WR

‘\)

\}

)

MA

\

WN

HN

nit

AWN

AAA

Wy

AX

400006

Ss

41PeE

sy

IF

ye

SP

OF

aAL—9

BEF

cD

BRON

77

vy

SP

7Fat—-F-M38BEFHTACE,

(Cy

7

Fy

TSHBRARMK

BOE

Sd.

RABE

Lacey

Ale)

FA

ATURE

LEW

S

41-2Aby

KFNGV

ARB

1.

TPADIBEYE

TPAD2ZBE

Y

(GND)

MOM

EAOV

Ic

BK

IZ

V405(S.BAL)

EHMETS.

41-3

b

Sy

FYING

YRBE

1.

TPID4HEY(TE1)E

TPIMDEGBREY

(GND)

ica

va

RI-DPEGEL.

SEARCH

DI

VV

(4d

EKIS

PH)

LH,

2G

FVY

FLIES

OMEMOV

EHIMCHRIS

&

5

V401

(T.BAL)

#3

¢

4.

41-474

-AZNDVYARE

1.

TPIOSHEY(RF)é

TPIODG6BEY

(GND)

ica

va

AIN-TRERT

S.

2.

PLAYIKKE

CA

Y

AAD

—SORMARA

ILI

S

KITV

402

(F.BAL)

©

iE

o

3.

Ny

MY

WN

iM)

ANY)

)

Maximum

M)

Fig.

4-8

4-1-5

Focus

offset

check

1.

After

adjusting

the

focus

balance,

stop

the

player.

Check

for

an

offset

voltage

of

50mV

or

less

at

TP3.

If

reading

values

are

out

of

spec,

adjust

V402

(F.BAL)

again.

4-1-4574

-HAADEy

hE

lL.

P#-HAND

VY

ARRMESTOP

IRAE

LC

TP3OA7t

yb

HEA

5SOMVALE

CHS

IL

EHTS.

4

LABILA

6

UBS

BE

V402

(F.BAL)

2H

S.

4-1-6

Focus

gain

adjustment

(Use

YEDS-

18)

1.

Apply

1.16kHz/3.5Vp-p

to

TP1

pin

1(FE2)

from

an

external

OSC

via

100k

resistor.

2.

Adjust

V404(F.GAIN)

so

that

phase

at

TP1

pin

2

(FE1)

is

90°

with

respect

to

that

of

the

external

OSC

during

playback.

Oscillator

1.16KHz/3.5Vp-p

Oscilloscope

|

VRDS-20

_

4-1-6

74

—-AATA

VIBE

(YEDS-

181)

1.

ABBOSC

&

Y

100k

Q

OF

RE

LT

1.16kHz/3.5Vp-p®

{224

7P1

O01

BEY

(FEQZIZCANTS,.

27

FARK

TPL

O

2B

Y

(FEI

EAM

OSC

EMA

90°

inte

Zk

3

tt

V404

(F.GAIN)

&3H4

+

Z,

SERVO

PCB

Fig.

4-9

4-1-7

Tracking

gain

adjustment

(Use

YEDS-

18)

1.

Apply

1.7kHz/4Vp-p

to

TP1

pin

3(TE2)

from

an

external

OSC

via

100k

Q

resistor.

2.

Adjust

V403(T.GAIN)

so

that

phase

at

TP1

pin

4

(TE1)

is

90°

with

respect

to

that

of

the

external

OSC

during

playback.

Oscillator

1,70kH2/4Vp-p

Oscilloscope

4-1-7

KSy

FYTT4

VIBE

(YEDS-

1816)

1,

ABBOSC

KY

100k

Q

OHA

LT

1.70kKH2/

4Vp-

p

O18

BETPIDZSBEYV

(TEI

ANTS.

2

TVA

TPIO4BE

Y

(TEL)

EWM

OSC

&

OLED

90°

Ix

H5k5

it

V403

(T.GAIN)

£39

3.

SERVO

PCB

Fig.

4-10

VRDS-20

|

4-2

AUDIO

ADJUSTMENT

4-7

470%

.

Output

level

HALAIL

DISC:

YEDS-18

(MCD-111)

TRACK

No.

}

347

FREQUENCY

Bik

2%

SPECIFICATIONS

0.3Vrms

(UNBAL)

0.3Vrms

(BAL)

REMARKS

i

%

load

impedance

:

BHIVYE-FYA:

50k

Q2

(UNBAL)

600

Q

(BAL)

.

Channel

level

difference

Fe

VRIVLSIVE

1.0dB

or

less

.

DC

offset

adjustment

_

DCAD»

bE

0

+

SmV

(UNBAL)

Adjust

V151

(bch),

V251

(Rech)

on

AUDIO

PCB

so

that

the

offset

voltage

becomes

OmV.

AI»

bBEAMOMVIC

&HSEKDAUDIO

PCB

V151(Leh),

V251

(Reh)

ERTS.

.

Harmonic

distortion

Bake

.

Frequency

response

FEROS

TE

.

S/N

ratio

SAN

IE

20Hz~20kHz

0.004

%

or

less

Within

+

1.0dB

100dB

or

better

AOOHz

HPF

in

20kHz

LPF

in

reference

level:

1kHz

DIN

AUDIO

(Use

SHIBASOKU

725

or

equivalent)

.

Channel

separation

Feely

BNL-Yay

95dB

or

better

DIN

AUDIO

.

Emphasis

effect

LY

7

YAR

10

AUDIO

PCB

—

9.0

=

1.0dB

(YEDS-18)

~

20

+

1.0dB

(MCD-111)

reference

level:

1kHz

Fig.

#-11