Philips Sylvania cd1473 User manual

rl

C

(

Manual No. 5374

CONSUMER

ELECTRONICS

CORP

Compact disc player

A North American PHILIPS Company

Product Services

Technical Publications Dept.

P.O.

Box

555, Old Andrew Johnson Hwy.

Jefferson City, TN 37760

erviceManual

For repair

of

the

CD

mechanism refer

to

Service

Manual

CDM~2,

version 0500

When

ordering

replacement

parts.

change

4822

to

4H

and

5322

to

5H.

First

Manual

Issue:

November,

1987

Magnavox Model: CDB473

ml

□

~i

DIGITAL

AUDIO

Chassis

CD473/17R

Sylvania model: CD1473

Chassis CD473/34R

CONTENTS

1 Explanatlon subdivision and table

of

contents per page

2 Controls and technical specifications

3 Servicing hints

4 Measurements and adjustments

5 Exploded views and parts lists

of

mechanical

components

6 Block diagram, circuit diagrams, PCB.data, parts lists

of

electrical components and wiring diagram

7 Changes

8 Additional information

Safety regulations require that the set be restored

to

Itsoriginal

condition and that perts which are identical with those specified

be

used.

cs

9 979 Copyright 19!!7

4822 725 50829 N.A.P. ConsumerElectronics

corp.

,_,

1.

EXPLANATION

ON

THE LAYOUT OF

THE

DOCUMENTATION

The

documentation consists

of

chapters.

The

number

of

the

chapter

is

indicated

by

the

first

digit

of

the

page

number.

The

second

digit

of

the

page

number

is

the

sequence

numbering.

If

modifications

or

supplements require

new

supplementary

or

replacement pages, the page

number

is

extended

with

a third part:

A

digit

behind

the

page

number

indicates

that

it

c;oncerns

a supplementary page.

A replacement

page

is indicated

by

a letter behind

the

page

number.

TABLE

OF

CONTENTS PER PAGE

Chapter

Page

Contents

Example

3-6

3-6-1

3-6-a

1

2

1-1

2-1

Explanation

of

the

subdivision

of

the documentation

Table

of

contents

per

page

3

4

5

2-2

3-1

3-2

4-1

4-2

4-3

4-4

4-5

4-6

4-7

4-8

5-1

Controls

Technical specification

Servicing

hints

Disassembly

of

top

cover

Servicing

of

front

panel

Servicing

of

tray

mechanism

Disassembly

of

CDM

Servicing

of

servo+

decoder

panel

Replacement

of

transformer

fuse

Electrical measurements and adjustments

General checkpoints, servicing programme

General checkpoints

Detailed measuring method

Detailed measuring

method

Detailed measuring

method

Exploded

view

tray

mechanism

Partslist

of

mechanical components

is

page

6

of

chapter

3

is a supplementary

page

behind

page

3-6

is the replacement

page

of

page

3-6

(so page 3-6 can be removed

from

the documentation).

6

5-2

6-1

6-2

6-3

6-4

6-5

6-6

6-7

6-8

Exploded

view

of

cabinet +

parts

list

of

cabinet

components

Block

diagram

cs 9

980

6-9

6-10

6-11

6-12

Wiring diagram

Circuit

diagram

of

the

servo

part

Circuit

diagram

of

the 1

st

decoding

part

Main Panel

drawing

(bottom view)

Main

Panel drawing (top view)

Circuit diagram

of

the

2

nd

decoding

part

Circuit

diagram

of

the

power

supply

Headphone P.B.

Assy

Volume control P.B.

Assy

Control and display P.B.

Assy

Electrical partsllst

List

of

standard chipresistors

0

( I

0

(

m1

□

0

~1

1

DIGITAL

AUDIO

7 8 9

a b C

2.

CONTROLS

1 "ON/OFF" key: for switching the player on and off.

2 Display: functions as

on/off

indicator; gives information

about the number

of

tracks

on

the disc, the playing

time, the progress

of

play and particular functions

of

the player, and signals any faults occurring during

operation

or

programming.

3 Remote eye:

for

receiving the signals from the remote

control handset.

4

"<J<l

SEARCH

l»ff

keys: for fast search

to

a particular

passage

(<J<l

backwards , forwards

I»).

5 "PLAY/REPLAY" key:

for

starting play ("PLAY") and

returning

to

the beginning

of

a track ("REPLA

V").

6 "STOP/CMff

key:

for stopping play during playback

("STOP") and

for

erasing a programme (CM =Clear

Memory).

7 "PHONES" socket: for the connection

of

a headphone

for listening to discs without using an amplifier.

8 Volume control: far adjusting the volume when

listening with a headphone.

·'

2 3 4 5 6

2-1

10

11

12

13

11.

15

16

d

42

31.5

812

9 "OPEN/CLOSEff key: for opening and closing the disc

tray.

10 "TRACK/TIME" key: for switching from track number

to

playing time indication and vice-versa.

11

"PROGRAM" key:

for

storing the track numbers

of

a

programme and producing the display

of

the

programme stored.

12 "PAUSE" key: for holding play at the start

of

a track

or

passge and for interrupting play.

13 "REPEAT'

key:

for repeating a disc

or

a programme.

14

"<J<l

INDEX

I»"

keys: for indicating the index number

you want

to

begin with

(<J<J

from Index number 99

tot

index number

01

and

I»

from index number

01

to

index number

99);

also for returning

to

a previous

index number

or

moving on to a laterone during play.

15 "FTS" key: for storing and playing Favourite Track

Selections

16 "PREVIOUS/NEXT" keys: for indicating the track

number you want

to

begin with, and selecting track

numbers when compiling a programme (<I from high

to low and

~

from low

to

high); also for returning

to

a

previous track number

or

moving on

to

a later one

during play.

a.

Out: for the signal output cable to the amplifier.

b.

RC5

in/out: for a separate receiver for the signals

from the remote control handset.

c. Dig out: for digital equipment.

d. Connections for the mains lead.

cs

9

981

2-2

TECHNICAL SPECIFICATION

• System

• Mainsvoltages

• Mains frequencies

•

Power

consumption

• Frequency range

• Output voltage

• Output impedance

• S/N ratio

• Chanell separation

SERVICE

TOOLS

Audio

test

disc

Disc

without

errors+

: Compact Disc Digital

Audio system

: 110 V, 127

V,

220

V,

240

V

±

10%

(to

be

changed

by

transformer connections)

:

50-60

Hz

(no adaption

required)

: 14 W

: 2 Hz +

20

kHz ± 0,05

dB

: max. 2

V,mJ~10

kOhms

: 200 Ohms

:

;;;;..96

dB

:

;;,,.93

dB

4822 397 30085

disc

with Simulated Drop

Out

errors,

(black spots

and

fingerprints) 4822397 30096

4822

395

50145

4822 395 50132

4822

53211547

4822

395

30204

4822

322

40066

4822 267 50676

5322

130

32182

Torx

screwdrivers

Set (straight)

Set (square)

Disc

hold-down

13th

order

filter

Service cable (14-pole)

Service connector(14-pole)

Green LED COYG II

cs

9 982

• Total harmonic

distortion

• Intermodulation

distortion

• Remote control

• De-emphasis

• Dimensions

wxhxd

• Weight

• Headphone

:

.,.;:;Q,00'3%

(-90 dB)

:

...-;0,003%

(-90 dB)

: Cinch bus

for

RC5

system

: O

or

15/50

µs

(switched

by

the subcode

on

the disc)

: 420 x86 x300 mm

(tray closed)

(tray opened)

420

x

86

x 425 mm

: approx. 2.9

kg

-Output voltage : max.

5.6

Vrms

-Output impedance :

150

Q

-Load impedance range: 8 n -2

k.O

-Output

power

:

30

mW

at

32

n.

()

(

( •

0

(

3. SERVICING HINTS

/A

ESD~

Alie ICs and many other semi-conductors are susceptible

to

electrostatic discharges (ESD).

Careless handling during repair can reduce life

drastically.

When repairing, make sure that you are connected with

the same potential as the mass

of

the set via a wrist

wrap with resistance.

Keep components and tools also

at

this potential.

The disc should always rest properly on the turntable.

To

achieve this a disc hold-down has been mounted in

the cover.

When

the

cover has

to

be taken from the

set

for

repair, a

separate hold down should be used.

Switch SK2 has

to

be activated.

The set can be used normally.

3-1

In the set chip components have been applied.

For disassembly and assembly of chip components see

the figure below.

For measurements and adjustments

it

is possible

to

position the working mechanism outside the set.

To

do

this

work

the following service aids are available:

-Service flat cable (14-pole) 4822 322 40066

-Service connector (14-pole) 4822 267 50676

These

two

items should

be

used

to

assemble an

extension calbe between connector

11

and the flex cable

of

the

CDM-2

unit.

Remark:

The service cable should be assembled as

follows (see drawing

MDA

00311).

The 14-pole connector should be soldered as indicated in

the drawing. Please remove the blue tape

of

the rear

of

the service flat cable-end which has

to

be connected

to

~onnector

11.

'Ill

CDM FLEX-CABLE

4822 267 50676

SOLDER

JOINT

4822 322 40066 MDA.00311

T19-73O

GENERAL DISMOUNTING MOUNTING

CHIP

SOLDER~ONENT

SOLDER

e=n(::~~:EA

TRACK

GLUE

SERVICE PACKAGE

VACUUM PISTON

SOLDERING

~2

IRON~

• 9 WELLER

t:~~=~=::I

SOLDER TIP PT-H7

uR

SOLDERING

IRON~

SOLDER WICK

4822321 40042

e g A PAIR

OF

TWEEZERS

SOLDERING IRON

SOLDER

WICK~

CLEANING

SOLDERING

IRON

SOLDERING

IRON

PRECAUTIONS

Firi. 1

A

B

C

e g. A PAIR OF TWEEZERS

c&

---------,

SOLDER

005-0

.

Bmm

SOLDERING TIME

<3 sec/side SOLDER

0 0.5 • 0.8 mm

PRESSURE

♦

EXAMPLES

A

B

27 012CU

r,~ q q~fi.

f.;R

3-2

DISASSEMBLY OF TOP COVER

-Remove

the

4 screws out

of

side walls

of

top

cover.

-Take

top

cover from set.

SERVICING OF THE FRONT PANEL

Disassembly of front panel

-Remove

top

cover.

-Remove the 3 fixing screws

at

upperside

of

fornt

panel.

-Now the front panel can

be

taken off.

-Ensure during mounting that the 3 bosses

of

the set

frame engage with the appropriate holes

of

the

frontpanel.

Disassembly of control + display panel

-The control and display PCB can

be

detached

by

removing the 7 screws

3Mx16

at

the bottom

of

the

display panel.

-Then the control +display panel can

be

taken

out

of

the front.

-When mounting, make sure that the 3 bosses on the

front slip into the appropriate holes in the PCB.

SERVICING OF THE TRAY MECHANISM

Demounting the tray mechanism.

-Remove the

top

cover.

-Remove the front.

-Push the tray

out

of

the mechanism.

-Remove the screw from the bottom

of

the

set.

-Undo the 3 screws with which the loading has been

mounted into the set. Two screws are situated

in

front

and one in the centre

at

the rear.

-

Lift

the

tray

mechanism a little and undothe flexible

PCB from the connector

by

liftingthe upper part

of

the

connector and taking the flexible PCB

out

Short circuit

the connections

by

means

of

a papercllp.

-Undothe 2 stocko connectors.

-Nowtake the tray mechanism out

of

the set.

cs

9 983

DEMOUNTING THE CDM

-Remove the complete disk hold-down.

-Turn the loading upside down.

-Support

the

CDM.

-Loosen the 2 screws on the metal bracket with which

the CDM is suspended.

-The CDM can

now

be removed.

-For servicing the CDM see Service Manual

CDM2/0500.

-Mounting is done in reverse order.

SERVICING THE SERVO + DECODER PANEL

-Remove

top

cover.

-Remove the

front

panel.

-Remove the tray mechanism.

-Remove the screw with which the chassis part is fixed.

-Remove the screw

in

the rear with which the CINCH

sockets are fixed.

-Remove the 2 screws on the PCB.

-Remove the screws from the transformer.

-The PCB

now

can be taken out.

-Mounting is done

in

reverse order.

REPLACEMENT OF TRANSFORMER FUSE

-

For

replacing the transformer fuse the transformer

must be desoldered from the main panel.

•

.C

0

C

(

0

(ill

□

ii

DICITAL

Al/DIQ

4. ELECTRICAL MEASUREMENTS AND

ADJUSTMENTS

HINTS

Test disc

It Is important to treat the test discs with greatcare. The

disorders on the discs (black spots, fingerprints, etc.) are

exclusive and unambiguously positioned. Damage may

cause additional drop-outs, etc. rendering the intentional

errors

no

longerexclusive. In that case it

will

no

longer

be

possible

to

check e.g. the good working

of

the track

detectors.

Measurements

on

op-amps

In the electronic circuit op-amps have been used

frequently. Some

of

the applications are amplifiers,

filters, inverters and buffers.

In

those

cases where in one way

or

the other, feedback

has

been applied the voltage difference

at

the differential

inputs converges

to

zero. This applies

to

both DC and

AC signals. The cause can

be

traced

to

the properties

of

an ideal op-amp

(Z

1= oo, G =oo, Z0 =

0).

If one input

of

an op-amp is directly connected

to

ground

it

will be

virtually impossible

to

measure at the inverting and the

non-inverting inputs. In such cases only the output signal

will

be

measurable.

That

is

why in most cases

the

AC voltages

at

the inputs

will

not

be given. The DCvoltages

at

theinputs are equal.

Stimulation with "O" and

"1"

During troubleshooting sometimes certain points should

be connected

to

ground

or

supply voltage. As a result

certain circuit can be brought

in

a desired state thus

shortening the diagnosis time. In a number

of

cases the

related points are outputs

of

op-amps. These outputs are

short-circuit-resistant, i.e. they can be brought

to

"0"

or

ground without problems.

The output of

an

op-amp, however,

should

never be

connected directly to the power supply voltage.

Measurements

on

microprocessors

Inputs and outputs

of

microprocessors should never be

connected directly

to

the power supply voltage. The

inputs and outputs should only

be

brought

to

"0"

or

ground

if

this is stated explicity.

Measurements

with

an oscilloscope

During measurements with an oscilloscope

it

is

recommended

to

measure with a 1:10 test probe, since a

1:10 probe has a considerably smaller inputcapacitance

than a 1

:1

probe.

Selection of ground potential

It

is

very important

to

select a ground point that is as

close

as

possible

to

the

test

point.

Conditions for injection

-Injection

of

levels

or

signals from an external source

should never take place

if

the related circuit has

no

supply voltage.

The injected levels

or

signals should never

be

greater

than the supply voltage

of

the related circuit.

cs9 984

4-1

GENERAL CHECKPOINTS

In the detailed measuring method below a number

of

general conditions, required for a properly functioning

set, will

not

be mentioned. Before the detailed measuring

method is started, these general points should first

be

checked.

a.

Ensure that disc and objective are clean (remove dust,

fingerprints, etc.) and

work

with undamaged discs.

b. Check

if

all supply voltages are present and

if

they

have the correct values.

c.

Check the good working of the CD mechanism

by

means

of

the servicing programme.

Indication of test points

In the drawings

of

the diagrams and the

panel~e

test

points have been indicated

by

a number (e.g.

~)

to

which the measuring method refers. In the measuring

method below, the symbol

<◊l

has been omitted for

the

testpoints indicated.

Initiation of the servicing programme of the

µP

-Servicing

position

"0"

Simultaneously depress the PREVIOUS, NEXT and

TIME/TRACK buttons. Keep these three buttons

depressed while the mains voltage

is

switched on.

This is the STAND-BY mode,

"O"

appears on the display.

(Tray switch SK2 must

be

activated)

In this state as in service position "1", "2" and "3",

it

is

possible

to

move the arm

by

means

of

the SEARCH

FORW and SEARCH REV keys with a minimum torque

to

the outside and the inside resp.

This enables a check

to

the free motion

of

the

arm

across the disc.

After depressing one

of

those keys (SEARCH FORW

or

SEARCH REV) the laser will emit light.

-Servicing position

"1"

From servicing position "0" the player can be brought

in servicing position 1"

by

depressing the NEXT key.

In this state

the

laser emits light andthe objective

starts

to

focus. When the focal point has been

reached, "1" appears on the display.

When

no

disc has been inserted the objective goes

16x

to

and fro. Then the player reassumes servicing

position "0".

-Servicing position "2"

To

be reached by depressing the NEXT key after

servicing position "1"

has

been reached.

The

tumtable motor starts

to

run

On the display appears "2".

When in service position "1" the arm

is

moved

or

the disk

is moved roughly (disturbance

of

focus), the motorwill

start running

at

maximum speed in position

-,,2".

By

pressing the NEXT key, the player can

be

brought

back, via position "3", into position "0".

-Servicing position "3"

To

be reached

by

depressing the NEXT key after

servicing position

·2·

has

been reached.

The radial control

is

switched

on.

The subcode

information is ignored. MUSB

is

high

so

that the music

information

Is

released.

4-2

On

the

display

appears

"3".

(Dependent

on

the

length

of

the

lead-in track music will

be

reproduced after

approx.

1 min.).

In

this

state

it

is

possible

to

move

the arm

by

means

of

the

SEARCH FORW and

the

SEARCH REV keys

to

the

outside

and

to

the

inside resp.

Now

the

motion

is

controlled

by

the

µP

and the arm moves

by

steps

of

'

64

tracks

as long

as

the

key

is depressed.

If

the

laser

is

disturbed in position "3" (as a result

of

braking

or

removal

of

the

disk)

the

player will

jump

back

to

position

"O".

This

also holds

good

if

position

"1

• and "2"

Is

disturbed and position "3"

is

called.

The

servicing programme can

be

left

by

switching

the

mains switch (POWER ON/OFF)

off

and

on

(hardware

reset).

Specification measurement

l

CD

PLAYER

-----;

FILTER

R

Fig. 4

~NANO

DISTORTION

METER

o.g.

SOVNO

TECMNOLDGY

ST

17008

30

,sg

All

To

measure

the

specification use can be made

of

audio

test

disc

4822

397

30095.

Use

13th

order

filter 4822 395 30204

to

measure (see

Fig.4):

-

Total

harmonic distortion (THD)

-Intermodulation distortion

-Signal-to-noise ratio (S/N)

Continuous burning

of

the

laser

-Bridge

c!!Q_acitor

2583

on

the

decoding panel.

-Connect

Si

(=

20

of

6525

on

the servo + preampi.

panel)

to

ground.

-Switch

on

the

supply

voltage.

-

Now

the

laser will burn continuously.

Note: Danger

Invisible

laser

radiation.

Avoid direct

exposure

to

beam.

Check

of

the

laser

supply

The

laser and, the laser supply in IC6525 plus

the

monitor

diode

from

a feedback system.

A

defect

in

the

laser

supply

can result in the destruction

of

the

laser.

If,

in

that

case,

the

laser

(=

complete CDM2 unit) is

replaced, the

new

laser will also become defective.

However,

it

is

impossible

to

check

and repair a feedback

system if a link is missing.

For

this

reason

the

laser

supply

can be checked with

the

circuit below.

The

green

LED replaces

the

laser,

the

voltage across

the

18

Ohm

resistor

is feed

back

as

monitor

voltage, the 33 Ohm

resistor

and

the

switch serve

to

draw

more current from

the laser supply.

CS 9 939

GB

~---------,...

to

LO

LED GREEN e.g. CQY

94

IV

CONNECTED

DIRECTLY

TO

PANEL

42

444

A12

5322 130 32182

The above circuit is connected

to

connector

31

via an

extension cable instead

of

a flex print. The normal flex

print

is

not

suited

for

this

purpose because

of

its high

internal resistance.

Code

no. extension cable 4822 322 40066

-Take

the

above flex print

out

of

connector

31

on

the

PCB.

-Connect

the

circuit

via

the

extension cable

to

the

connector.

-Select

the

play mode by grounding Si (pin

20

of

IC6525).

Note:

Si=

0,

start

initialisation

low,

is

the play mode.

-Measure

the

voltage LO (LaserOut) at

test

point

9.

SK open: 1,8

V,,;;;

LO,,;;;

2,3

V

170

Mv

.,,,:;

LM

.,,,:;

220

mV

The

green LED emits little light.

SK

closed: 1

,8

V

.,,,:;

LO

.,,,:;

2,3 V

170

Mv

,,;;;

LM

,,;;;

220

mV

The

green LED emits little light.

-During

the

change

over

from SK closed

to

SK

open,

the

LED will

emit

more light

for

a

short

moment.

-

The

control sees

to

It

that

the same amount

of

current

flows

through

the

LED

when

SK is open and

when

SK

is closed.

At

si = 1, in

the

STAND-BY state,

LO=

0 V ± 0,2 V.

Repair procedure

Since

laser, monitor diode and photodiodes

are

very

sensitive to static charges,

care

should

be

taken

that

during measurements and adjustments

the

aids

and

yourself

have

a potentlal

that

Is equal to

that

of

the

CD

mechanism.

Attention: When exchanging

the

CDM2 unit,

the

laser

output

potentiometer3528 should be placed in

mechanical mid-position

to

avoid damage

to

the

laser.

Adjusting

the

laser

current

Coarse adjustment

-Place potentiometer 3528 approximately in

mid-position.

-Put

test

disc

5

on

the turntable.

-Bring

the

player in service position 1.

-

The

focusing

motor

can

now

start

focusing

16x

and

when

it

has found

the

focal point a "1" will appear

on

the

display.

-

If

this

does

not

happen, turn potentiometer 3528

clockwise

or

anti-clockwise a little.

Here

after

the

fine adjustment

of

the

laser

current

has

to

be carried out.

Fine

adjustment

-Play track 1

of

the

test

disc

5.

-Adjust potentiometer

for

a voltage across 3508

test

point 1

and

2

of

50

mV

± 5 mV.

(

0

(

'

C

0

(

uJ

□~

DtOffM

AUDIO

Adjustment of

the

focus off-set

Coarse adjustment

A.

-Place potentiometer 3517 approximately in

mid-position.

-Put

test

disc 5 on the turntable.

-Bring the player

in

service position 1.

-The focusing

motor

can now start focusing 16xand

when

it

has found the focal point a "1" will appear

on the display.

-

If

this does

not

happen, turn potentiometer 3517

clockwise

or

anti-clockwise a little.

-Here afterthe fine adjustment

of

the focus off-set

has to be carried out.

B. -Place with potentiometer 3517 the focusing motor

in optical horizontal position.

-Here afterthe fine adjustment

of

the focus off-set

has to be carried out.

Fine

adjustment

-Bring the player in service position

2.

-Adjust potentiometer 3517

for

a voltage across 2545

(test point

27)

of

400

mV

±

40

mv.

Note: Notice that the CDM

is

in

a horizontalposition.

Changing

the

transformer connections

6

5

UNITS

SOLD

IN

U.S.A.

CANNOT BE CHANGED

A DEDICATED

TRANSFORMER

6

5

22DV~

240V~

Fig. 6

AS

THEY

HAVE

2

42

492

A12

If the set should be connected

to

a mains voltage that

deviates

from

the voltage mentioned on the type plate,

the transformer connections should

be

changed,

as

indicated in Fig.

6.

DETAILED MEASURING METHOD

I. µP IC6551

• Servicing program

For

initiation

of

the servicing program see: General

checkpoint: Initiation

of

the service program.

•

Reset

(pin

17)

When the supply voltage is switched on, a positive

pulse should be present.

• X•tal out (pin 16;

test

point 31)

The frequency

of

this signal should

be

6 MHz.

• 1

2c (pin 3;

test

point

29)

• 1

20 (pin

2;

test

point

31)

These should be activity

at

test point

29

and

31

in

position play.

•

MSTP

(pin 20;

test

point

78)

4-3

When, after RD "high", the MSTP

is

"high"

for

a short

moment(>

0.2 sec.), the turntable

motor

control will

be

switched on.

The turntable motor is controlled by the MC-signal

(test point 12).

To check MC, see: "Decoder A IC".

To

check the

turntable motor control see CDM2 Service Manual

"Checking

of

the motor control".

•

BO

(pin 11;

test

point

36)

81

(pin 1

O;

test

point 34)

B2

(pin 9 ;

test

point

33)

B3

(pin 8 ;

test

point

32)

With the

BO

+

83

signals

• The radial control is switched on.

• The level on the

DAC

output is controlled.

-In the SEARCH mode, there should

be

activity on all 4

test

points.

In the following positions the signals

BO

+

83

are

stable:

STOP

PLAY

Service Service

signal pas. 0,1,2

pos.3

BO

"low" "high" "low" "high"

81 "high" "high" "high" "high"

82

"high" "high" "high" "high"

83

"low" "low" "low"

"low"

•

TL

(pin 12; test point

16)

-The

TL

signal (Track Lost) Is used

to

tell the µP that

track loss threatens. The µP then can give correction

signals with

BO

+ 83.

-In the "SEARCH" mode,

or

when the player

is

bumped

against, there are pulses on test point 16.

• REdig (pin 13;

test

point 37)

The REdig signal

(=

Radial Error Digital = radial

deviation)

is

used

to

determine the place

of

the arm

relative

to

the track and

to

check/corect in case

of

track jumping

or

bumping against the player.

In servicing position 3

or

in

the PLAY mode, a square

wave should be present on test point 37.

Because

of

frequency variations, this square wave is

hard

to

trigger.

• DODS (pin 22; test point

19)

The DODS signal

(=

Drop Out Detector Suppression)

avoids

that

Drop-Out signals influence

the

arm control

durinq track jumping.

Position POWER Servicing PLAY SEARCH

of

ON

pos.3

player

DODS

u'

U

signal

11

low"

"high" "high"

MDA00364

cs

9 985

T12

-638

4-4

•

MUTE

signal (pin 11;

test

point

67)

When Filter-B

IC

is applied, the

MUTE

input

will

not

be

used.

IL

CONTROL

µP

IC6566

•

Reset

(pin

2;

test

point

100)

When

the

supply

voltage

is

switched

on

a positive

voltage should

be

present.

• X-tal (pin 5;

test

point

101)

The

frequency

of

this

signal

should

be 4

MHz.

• Data (pin 25;

test

point

102)

• Clock (pin 26;

test

point

103)

There should

be

activity

at

test

point

102 and 1

03

in

position

play

(dlsplay Information).

• 12C

(pin

22;

test

point

29)

• 1

20 (pin

23,

17;

test

point

31)

There

should

be activity

at

test

point

29 and

31

in

position

play.

• POR (pin 28;

test

point 104)

When

the

supply

voltage

is

switched

on

a negative

puts

should

be

present.

Ill. PHOTODIODE SIGNAL PROCESSOR IC6525

•

SC

(pin

25)

SC(::

Start Capacitor)

High Ohmic measurement

Position

of

player

SC

(pin 25}

POWER ON

-4

V

PLAY

+5

V

Servicing

pos.

1

+5

V

• Si (pin 20; test point 21)

LO (pin 17;

test

point 9, gA, 98)

-With

the

Si signal (=

Start

Initialization)

the

laser

supply,

among

other

things, is switched on.

When

the

Si signal is "low",

the

LO

signal

(=

Laser

Out) should

be

"high".

Via

the

LM

signal(=

Laser

Monitor)

the

power

supply

for

the

laser

diode

is controlled.

Position

of

POWER Servicing PLAY

player ON

pas.

1•)

Si signal "high" "low" "low"

LO

signal "low~ "high" "high"

•

LM

(pin

16;

test

point

11)

to

check

LM

See general checkpoints 'check

of

the

laser

supply'

• To check

the

laser

supply, see General checkpoints

"Check

of

the

Laser

Supply".

• To check

the

focus offset, see Genera! checkpoints

"Adjustment

of

the

Focus Offet".

*)

To

ensure

that

the player

stays

in servicing position 1,

there should

be

a

disc

on

the turntable.

cs

9 986

•

FE

pin (pin 5;

test

point

26)

-The FE signal

(=

Focus Error) is used

to

drive the

focusing unit.

When

the

SI signal

goes

to

"high",

the

focal

point

will

be

searched for.

-When

the

player

is brought

into

servicing position 1

without

disc,

the

objective will search 1Sx

for

the focal

point.

At

test

point

26

the FE signal varies 16x between

+2

V and

-1,5

V.

-

The

FE signal

ensures

that

the

spot

stays in focus.

When an

error

signal is injected,

the

FE signal will

correct.

Bring

the

player in servicing position 2 (with

disc

on

turntable).

Inject successively a voltage

of

+5

V and

-6

V

(==

+SA and

-6B)

via a

200

kO

resistance

to

test

point

25.

Signal injected

test

point

25

IC7104A

+5

V

FE signal negative

• RD signal (pin 21;

test

point

24)

HIGH-OHMIC MEASUREMENT

-6

V

positive

The

RD

signal

(=

Ready) will

go

high when

the

starting

procedure

of

IC6525

has

been completed.

PO

Sm

ON

PU\

YER

POWER

ON

SERVICE

POSfTJON

1

J7_

POWER

ON

•

D1

(pin 9 ;

test

point

4)

D2

(pin

10:

test

point

6)

D3 (pin 8 ;

test

point

7)

D4 (pin 7 ;

test

point

8)

"HIGH"

PLAY

i.ow-

MDJ\,00363

T12

-638

-

The

signals

D1

+04

are

the

error

signals

from

the

photodetector

circuits.

-When in servicing position 1

the

disc

is

moved,

the

focusing

unit

should keep in track.

When

the

disc

is moving, there should

be

a changing

signal

on

test

points

4,

6, 7 and 8.

-

Check

of

the

photodetector.

Connected

the

circuit

below

to an atternating voltage

of

17,5 V.

o---~~OE

t-----"J--

1.15W

17.SV~

100 E-1.5 W

BAW62

CQY89

BAW62

-4822 116 51096

-4822 130 30613

-

4822

130 31332

.,,

'CQY89

39

368

A12

Switch

on

the

supply

voltage and bring

the

player in

the

stand-by

mode

or

in serciving position 0.

In

this

measurement, infrared

diode

CQY69 replaces the

function

of

the

laser

diode.

0

(_

'

(

C

(

(Q]affl

GfQnaL

AUDIO

When

this

diode is held above

the

objective unit,

the

infrared light falls

on

the

4 photodiodes.

When

the

4 photodiodes are functioning,

the

following

voltage form will be visible on

test

point 4, 6, 7 and 8

on

the

panel.

(The amplitude depends

on

the distance between

the

IR

diode

and the objective).

~no

LJ7._J

L

38

31l,

A12

Position

of

the oscilloscope: 100 ms/div.

• HF-in {pin 3,

test

point

3)

-

The

HF-signal('"' High Frequency in) is

the

information

signal from

the

4 photodiodes.

• HF-out (pin 27; test point 17)

-

The

HF-out signal (= High Frequency) is

the

amplified

information signal

for

the

decoder circuit.

During playback

of

test

disc no. 5 (4822 897 30096), a

so-called "eye pattern" should

be

present

on

test

point

17

(see figure below).

-

The

HF signal should

be

present and stable in:

-

The

PLAY mode and in

-Servicing position 3

after

the lead-in

track

has been

read.

-In servicing position 2 and during

the

reading

of

the

lead-intrack,

the

HFsignal ispresent

but

is

not

stable.

HF

OUT

Position

of

the oscilloscope: 0,5 µs/div.

Amplitude

about

1,5 V

PP

e DET (pin 26)

42

517

A12

HFD (pin 19; test point 23)

TL

(pin 18; test point 16)

-

The

DET

signal

(=

Detector) gives information

on

the

level

of

the

HF signal

to

the

high-frequency.

Level-Drop-out detector IC6525.

-When the level

of

the HF signal

is

too

low,

the

HFD

signfil.J:: High Frequency Detector) will

go

"low".

-

The

TL

signal (= Track Lost) will then

go

"low" in

order

to

tell

the

servo

µP

that

the

tracking signals are

unreliable.

Method:

(Can only be used in a playing set).

-Put

test

disc SA 84822 397 30096)

on

the turntable.

-Switch

on

the

power-supply switch and press

the

PLAY key.

-Play track number

10

or

15 and check

the

HFD signal

at

test

point 23.

When drop-out pulses

are

present

on

the DET signal

(pin 26), the HFD pulses should also

be

present

at

test

point 23.

(Position

of

oscilloscope: 2 ms/div.).

When

the

disc

is slowly braked

by

hand,

TL

pulses will

be visible at

test

point

16.

•

RE1

(pin 11; test point 18)

RE2 (pin 12; test point 22)

-Signals

RE1

and RE2 (Radial Error) are the control

signals

for

the arm during tracking.

4-5

-In servicing position 2,

the

following signals should

be

visible

at

test

point 18 and

22.

rnn

fl

nonn

(\

n

OOr

ovv

\Juovcr

0

\JVU

Position

of

the

oscilloscope: 2 ms/div.

The

frequency strongly depends

on

the

eccentricity

of

the disc.

IV. RADIAL ERROR PROCESSOR IC6529

• Check the signals between the µP and the Radial

Error

Processor

• DAC (pin 10;

test

point 38)

With

the

DAG signal

(=

Digital

to

Analogue Converter)

the

track

jumping speed is controlled.

This signal

is

derived from

the

signals

BO

+

83

coming from the µP.

• RE-lag (pin

8;

test

point 41)

Capacitor 2559 in

the

RE-lag circuit has a memory

function.

It

memorizes

the

degree

of

inclination

of

the disc.

When a

jump

is

made

to

a certain

track

on the disc,

the

memory should be cleared.

This

is done

by

the

µP

(RPU signal) via transistors

6533, 6534.

During

track

jumping (SEARCH),

slow

pulses should

be visible

at

test

point

43

(position

of

the

oscilloscope

0,1 ms/div.)

In

that

case pulses should

also

be

visible on

the

collector

of

transistor6533, 6534.

cs 9

987

4-6

V. DECODER-A IC

•

Check

the

MC

signal (pin 17; test point

12)

In

stand-by mode, the

MC

signal (Motor Control)

corresponds

to

the figure below.

-Place a disc

on

the turntable.

In position PLAY

or

SERVICE POSITION 3 the MC'

signalcorresponds

to

the figure below.

Ln_fl_

POSITION: STA~O

~

vlrL

POSrTION:

PLAY

IBEGINN!NGI

POSITION: PLAY !NORMAL!

38

8•9

A12

Note:

During start-up the duty cycle

is

98%, then the duty cycle

of

the

signal becomes about 50%.

•

VC

(connector point

15-1;

test

poirft 46)

-Place a disc on the turntable.

-

The

voltage

at

connector point 15-1 during playback

will be:

Yc=O>Vc>-1.7V

To

check

the

turntable motorcontrol, see C.D.M.-2

Service Manual: "Checking

of

the motor control".

•

Check

the

HFD-signal

on

test point 66, pin

26

-

Insert

a disc.

-

In

the PLAY mode and in SERVICING POSITION 3 the

HFD-signal

is

"high"; however, minor pulses may

be

present and in case

of

disorders on the disc.

In

SERVICING POSITION 2 and during playback

of

track

no.

15

of

test disc 5A HFD pulses are visible.

Position

of

the oscilloscope 5 ms/div.

r.'(')A.002.:tO

T07/7JJ

•

Check

the

CEFM

signal (pin 27;

test

point 68)

-Place a disc on the turntable.

-In stand•by mode (only the mains switch

is

depressed), the frequency lies between 2.82 MHz and

5.64 MHz.

-In the position PLAY and SERVICE POSITION 2 and

3,

the frequency is 4.32 MHz.

•

Check

the

Xin signal (pin 19;

test

point

69)

-

The

Xin frequency is 11.2896 MHz.

If

this frequency deviates, check

test

point 70; Xout

signal, on Filter-8 IC.

This frequency should also be 11.2896 MHz.

•

Check

the

timing signals

meant

for

Fllter-B IC

-Place a disc on the turntable.

-Selectone

of

the following positions:

SERVICE POSITION 2

or

3,

or

position PLAY.

-Trigger the oscilloscope with the WSAB signal (test

point

71

; pin 39).

-Check signals:

WSAB

at

test point

71

(pin 39)

(Word Select from Decoder-A

to

Filter-8)

GLAB

at

test point72 (pin 38)

(Clock from Decoder-A to Filter-8)

andtheir interrelation.

-There must

be

activity a test point 73 (pin 37), DAAB

signal (DATA from Decoder-A

to

Filter-8).

•

Check

the

EFAB

signal (Error Flag from

Decocder-A

to

Fllter-8)

at

test

point

74

(pin

36)

-Place test disc 5A on the turntable.

-Select one

of

the following positions:

SERVICE POSITION 3

or

position PLAY.

-During playback

of

track no. 17, a EFAB pulse should

appear

at

test

point

61

for

a short moment.

The EFAB pulses also appear when the disc

is

gently

slowed down and during fast search (Fast Forward

or

Fast Reverse).

Note:

Filter-8 IC

is

capable

of

interpolating linearly 8

successive EFAB pulses.

I I I

I-._

L

...

,~i

ll

period

"""-.!..

EFAB

!errcrflogl IIIII]J I

'38

St,.S

A\2

•

Check

the

a-channel

signals

-Place a disc on the turntable.

-Select one

of

the following positions:

SERVICE POSITION 3

or

position PLAY.

-Trigger on the ORA signal (0-channel Request

Acknowledge) test point75; pin30.

-Check signals: QRA

at

test point75 (pin 30)

OCL a test point76 (pin 31)

(Q-channel-clock)

and their interrelation.

-There should then be activity

at

test

point77 (pin 29)

ODA (0-channel Data).

Note:

The ORA request is initiated by the µP (QRA "high").

Then Decoder-A answers this request (ORA goes "low").

With the next leading clock pulse (OCL) the ORA signal

is

rendered "high" again

by

the µP.

As soon as

the

µP has taken in enough information via

QDA, QRA will

go

low

again. That is

why

the ORA times

vary each time.

cs 9 988

(

C

(

C

(_

00.

flilc-J

TO

D£COOER

~

Rt:0:fVED

$Uff[;l!.•H

Q.t,lA

• Check the SSM signal (test point 78; pin 33) =

Start-Stop turntable motor

-

Motor

start

pulse when test

point

78

is "high"

for

;;,,

0.2 sec.

-

Motor

stop pulse when test point

78

is

"low"

for

;;;o

0.2

sec.

Note:

After the

motor

start

pulse,

SWAB

information

(Subcoding Word clock) will become visible

at

this point.

The period time

of

that signal is 136 µsec.

• Check the subcode clock signals

-Place a disc

on

the turntable.

-Selectone

of

the following positions:

SERVICE POSITION 3

or

position PLAY.

-Trigger the oscilloscope with the SWAB signal

at

test

point

78.

-Check

the

following signals:

SWAB

at

test

point 78; pin

33

SCAB

at

test

point 79; pin

35

(Subcode Clock

from

Decoder-A

to

Filter-B)

SDAB

at

test

point 80; pin

34

(Subcode Data

from

Decoder-A to Fllter-B)

and

their

interrelations.

Note:

While the burst

of

1Oclock pulses appear

on

SCAB

the a-channel information

is

transferred

on

SDAB.

Hereafterthe P-bit indication follows.

The P-bit is "high" between

two

bursts

of

1Oclock

pulses

in

case

of

pause indication and "low" in case

of

music indication.

SWl<B

SDAB

_I--=

e Check the CRI signal (pin 28)

MDA.00239

T12/638

The CRI signal is "low" in case

of

track jumping.

Player

in

position SEARCH.

cs

9 989

• Check the DEEM signal (test point 84: pin 32)

Place test disc 5

on

the turntable.

4-7

-During playback

of

track no.

14

(recorded without

PRE-EMPHASIS), the DEEM signal should be "low".

-During playback

of

track no. 15 (recorded without

PRE-EMPHASIS), the DEEM signal should be "high".

VI. FILTER-B IC

• Check the signals between Decoder-A IC

and

Filter-B IC

-See sub.

"V.

Decoder-A IC":

• Check the X-tal signal

• Check the timing signals meant

for

Filter B

(WSAB,

CL.AB,

DAAB

signals; test points 71, 72

and

73).

• Check the EFAB signal (test point 74)

* Check the subcode clock signals

(SWAB, SCAB, SDAB signals;

test

points 78, 79 and

80).

• Check the timing signals

between

Fllter-B IC and

DACIC

-Place a

disc

on

the turntable.

-Select one

of

the following positions:

SERVICE POSITION 3

or

position PLAY.

-Trigger the oscilloscope with the WSBD signal (Word

Select from Filter B

to

DAC) test

point

85 (pin 18).

-Check the following signals:

WSBD

at

test point 85; pin

18

CLBD

at

test

point 87; pin 16(Clock signal

from Filter B

to

DAC)

and their interrelation.

If an Audio Disc

is

used, there should

be

activity

at

test point

86

(pin 15) DABD signal (DATA from Filter B

to

DAG).

If

a

disc

with Digital Data (CD-ROM) is used, this point

is continuously switched "low"

by

transistor6572.

WSBO

_________

_,

176.lMHz

CLOO

=i

SSIMI

•

~

• Check the DOBM signal (Digital Output)

-Place a

disc

on

the turntable.

-Select

the

stand-by

mode

(only mains switch

depresed).

-Trigger the oscilloscope with the WSAB signal (test

point71).

• Check the DOBM signal (test point 88: pin 14)

-An empthy audio signal has a fixed pattern. See

drawing "Stand-by".

-Select the PLAY mode.

Check the DOBM signal. See drawing "PLAY".

.....

..,..

,_

Ul,_,__i

--~1nJJUUUl[===11w1Jl

4-8

•

In

position SEARCH the ATSB signal is "low" (test

point 89; pin 22) (Attenuation Audio Signal)

• Check the MUSB signal

test

point 90;

23

((Soft Mute)

This

signal

is

"low"

in

positions:

PAUSE

jumping from

one

track

to

another.

Fast SEARCH

when

the

search

button

is

kept

depressed

for

some

time.

VII. DAC

IC

(Dual Digital Analog Converter)

e Check

the

signals between Filter-B IC and DAC IC

-See

sub.

"VI.

Filter-B IC":

•

Check

the

timing

signals

between

Filter-8

IC

and

DACIC

e Check

the

output

of

the OP-AMP after the DAC IC

-Place a

disc

on

the

turntable.

-

In

position PLAY

or

in

SERVICE POSITION 3,

the

analog (music) slgnal should be

present

at

the

output

of

the

OP-AMP,

after

the lead-in

track

has

been

read.

VIII. DEEM

CIRCUIT

e Check DEEM circuit

-Place

test

disc

5

on

the

turntable.

-During

playback

of

track

no.

14

(recorded

without

PRE-EMPHASIS)

the

DEEM signal

at

test

point

84

should

be

"low·.

-During

playback

of

track

no.

15

(recorded with

PRE-EMPHASIS)

the

DEEM signal

at

test

point

84

should

be

"high".

-During

playback

of

track

no.

14

the

analogue signal

should

be

present

at

the

source

of

6583

(test

point

91)

and

6582

(test

point

92).

-During

playback

of

track

no.

15

the

analog signal at

the

source

of

6583

(test

point

91)

and

6582 (test

point

92) should

be

OV.

IX.

KILL

CIRCUIT

-During

switching

on

and

off

the

mains voltage

the

signal

on

the

collector

of

6580

(to

be

measured

on

a

jumper,

tp93)

should

be

as

indicated

in

the

figure

below.

-2V

-av

ois•c~ 1

,

'

POWER ON

2V

ov

X.

FAVOURITE

TRACK

SELECT (FTS)

Attention:

-av

When

repairing a

CD

player

it

is

important

that

the

contents

of

the

FTS

memory

(EEPAOM) should

not

unnecessarily be filled.

If

not

complaints

are

reported

about

the

functioning

of

the

FTS, a

check

of

the

functions

of

the

EEPROM

should

be

left

undone.

The

EEPROM IC

is

in

the

Stand-by

mode

when

CE

and

WE

are

both

high.

~

-{CJ-

~

-c=:J-

-c:::J--

*

~I-

QJ;Ln--

~I-

-41--

~I-

*

~I-

0

2W

i:S;

220ko 5%

(CR 16) > 270ko 10%

033W

!St

1Mo 5%

(CR

25) > 1Mo

10%

033W

5%

(SFR25)

025W

~

10Mn 5%

(VR

25) > 10Mo 10%

O.

SW

=Iii

1Mo 5%

(CR 37) > 1Mo 10%

0.67W 5%

(CR 52)

115W

5%

(CR 68)

Ceramic

pla1e

Polyester flat foil

Polyester mepolesco

Mylar

{Polyes1er flat loil small sized)

M1cropoco

Tubular ceramic

(body colour pink

or

yellow/green)

Miniature single elco

Subm,nialure tantalum

*

a•2.5V

b=4V

c-6,3V

d=10V

e-16V

f-25V

g-40V

h-63V

,-1oov

1-125V

1~12sv

m-150V

n•160V

q=200V

r=250V

s=300V

I=350V

u~400V

v=500V

w-630V

x=1000V

A•l

6V

B=6V

C=12V

D•15V

E-20V

F-35V

G=50V

H~75V

1-aov

MDA00084

T32-735

cs 9

990

.(

C

(

6-1 6-1

BLOCK DIAGRAM

~--

-

----7----

-

------

1

CDM

2

SERVO

CIRCUIT

DECODER

-

CIRCUIT------

-

------

~

------------------------

-

------------T----7

uP041416

-(]f-

DIGIT

AL

OUT

I I

NJ

-

A7

~R:1

-0A4

DEEM

~--~---~

~------~

I I

Hf

.,

,------~

D1- 4

HF

Hf

LM

PROCESSOR

6525

SAA721

0

DECODER

X

IN

lf-------l

XsYS

SAA7220

DOBM

'72ZZ::;t2z!

.....

____

A_

F

--+-t

'1

TO

A 154 1

~

DIGITAL

FILTER

CD

MECHANISM

COM

-2 n

RO

DISC

ooos

LOOPFILTER

CURRENT

SOURCE

CHARGE

PUMP

IREF

PO-QC

6554

CAI

MC

ORA

OOA

OCL

SWAB/

SSM

MUTE

6563

ATSB

DUAL

OAC

I

AF

I

65

71

I

I I

RD

R

E2

MUTE

6549

6550

I I

L

___

J

CDROM

SWITCH

6315

I

-=

I

RA

DI

AL

ERR

OR

1

~~~T

PROCESSOR

8013 RE-dig

TL

RD

S,

0005

Mlfle

MUS

s

ATSB

t--------------,

'

I

~

6529

jzZZ'!ZZZ.24'.Z~

BO,J

1----

I

MAB

8441

I

RPU RPU

APlJ

120

DECODER

µP

~~ic:TECTK>N

I

~

6551

,,c

I

Ve

TURNTA8l.E MC MC

~--------,----!

~~ROl

6539 I

~----------1 _J

'1

MAINS

SWITCH

CIRCUIT

1'

::~

jCONTROL

AND

DISPLA

v

CIRCUIT-

~OADING-

ASSY--

-

--

- -

--

-

'1

I I i

°/

I I

I :: I

,-----'----------,

I ! I

1 •5 1

CONT

R

OL

ANO

DISPLAY

.,e

I I

! S~ Y

::

!

'--r7-~.---TTT7"7"7---"

L_

__:__-

-~

__

_--7 !

I :~I

~~

I I

l________

~:5

_L___________________

Fs:MEMORY

_________________

L

_____________

j

B0-B3

-Control bits for radial circuit

RE1

-Radial error signal 1 (summation of

ATSB

-Attenuation

of

Audio level

in

Search

MUSB

-

PRS03037

112/735

Soft Mute signal

DAC

-Current output for track jumping amplified currents D3 and D4 position (Cueing)

PD/OC

-Phase detector -oscillator control

(Digital

to

Analogue Converted)

RE2

-Radial error signal 2 (summation of

CD

ROM

-Digital Data information on disc

acL

-a-channel Clock signal

DODS -Drop out detector supression amplified currents D1 and D2 Switch signal

aDA

-a-channel Data signal

D1+4

-Photodiode currents

RE

dig -Radial error digital CEFM -Clock Eight-to-Fourteen Modulator

aRA

-a-channel Request Acknowledge

FE

-Focus error signal

RE

lag -Radial error signal for

LAG

network

CLAB

-Clock signal Decoder-A to Filter-B

SCAB

-Subcode clock Decoder-A to Filter-B

FE-lag -Focus error signal for

LAG

network

RD

-Ready signal, starting up procedure CLBD -Clock signal Filter-B to

DAC

SCLK-I2C -Serial Clock signal Decoder-Control

HF

-

HF

output for DEMOD finished

CRI

-Counter Reset Inhibit

µP

(Inter

IC

Connection)

HFD

-

HF

detector output for DEMOD

RPU

-Radial puls after track jumping

DAAB

-Data signal Decoder-A to Filter-B SDAB -Subcode data Decoder-A to Filter-B

HF-in -

HF

current input

Si

-On/off control for laser supply and

DABD

-Clock signal Filter-B

to

DAC

SDAT-I2D -Serial Data signal Decoder-Control

LM -Laser monitor diode input focus circuit DEEM -Deemphasis

µP

(Inter

IC

Connection)

LO

-laser amplifier current output TL -Track loss signal

DOBM

-Digital out signal

SWAB/SSM

-Sbucode Word/Start-stop motor

MC

-Motor control signal

Ve

-Control voltage

for

turntable motor

EFAB

-Error flag Decoder-A to Filter-B signal

RE

-Radial error signal (amplified IREF -Reference Current

WSAB

-Word Select Decoder-A to Filter-B

RE

2-RE1 currents)

MSTP

-Motor start-stop signal WSBD -Word Select Filter-B to

DAC

MUTE -Mute signal

XIN

-Oscillator signal

in

Decoder-A

XSYS

-Oscillator signal out Filter-B

cs 9 948

Philips Sylvania CD1473 User manual

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