Kenwood Dp-7010 User manual

COMPACT

DISC

PLAYER

DP-7010

SERVICE

MANUAL

KENWOOD

PRINTED

IN

JAPAN

B51-3677-00(0)2842

Panel

(Tray)

Metallic

cabinet

(A29-0139-03)

(A01-1514-02)

Knob

(POWER)

Panel

ass'y*

Knob

(1~20)

(K29-3363-14)

(A20-)

(K29-3493-04)

x

20

Insulator

ass'y

(Front,

Rear

L)

Front

glass

Phone

jack

(PHONES)

Remoto

controller

ass'y

(J02-0397-15)

x

3

(B10-0979-13)

(E11-0190-05)

(A70-0251-05)

Phono

jack

(LINE

OUTPUT)

Transmitting

ass'y

(OPTICAL)

DIGITAL

OUTPUT

Power

cord

bushing

AC

power

cord*

(E13-0483-05)

(W02-0936-05)

(J42-0083-05)

(E30-)

ting

9)

poe

i

CJ

AC

110-120V~

«em

AC

220-240V~

[

Optica

@|

a

Cap

(B09-0068-05)

Insulator

ass'y

(Rear

R)

Phono

jack

(COAXIAL)

DIGITAL

OUTPUT

Slide

switch

(Power

type)*

(J02-0396-15)

(E13-0137-05)

(S31-2128-05)

In

cormplicance

with Federal

Regulations,

following

are

reproduc-

*

Refer

to

parts

list

on

page

71.

tions

of

labels

on,

or

inside

the

product

relating

to

laser

product

safety.

KENW/OOD-Corp.

certifies

this

equipment

conforms

to

DHHS

Regulations

No.

21

CFR

1040.

10,

Chapter

1,

Subchapter

J.

DANGER

:

Laser

radiation

when

open

and

interlock

defeated.

AVOID

DIRECT

EXPOSURE

TO

BEAM.

DP-7010

CONTENTS

CONTROLS

AND

INDICATORS

CONTROLS

AND

INDICATORS

............sscsssssesssseenes

3

9.

18-bit

serial

input

D/A

converter

PCM58P

aaa

\

SYSTEM

CONNECTIONS

.........c:csscsssssesccsssssssersseeees

4

(XB2-137X-XX

2

1CT,B)

...ccsecsssseessecerssecereeeenee

34

H

4

DISASSEMBLY

FOR

REPAIR

10.

8x

over-sampling

digital

filter

SM5813AP

Plopien

Sher

erat

Poe

vie

i

1.

Removing

the

operation

unit....

(X32-137X-XX

2

1014)...

ccsesssessseesseeserveeses

36

:

TOTAL

TIME

Music

calendar

(1

-

20)

‘

2.

Removing

the

tray

...

eine

8

11.

D.P.A.C

IC

TC17GO08AF-8060

:

INDEX

No.

indicator

Output

level

indicator

3.

Installing

the

tray

.....

9

(X32-137X-XX

:

1C19)....

42

!

:

4.

Removing

the

pickup...

10

MECHANISM

OPERATION

DESCRIPTION

46

:

Program

No.

indicator

:

BLOCK

DIAGRAM........

ae

1

1.

Tray

OPEN/CLOSE

operation.......

47

:

CIRCUIT

DESCRIPTION

2.

Pickup

chassis

UP/DOWN

movement

.......47

'

Tanck

NOV

noex

au

wo

ee

Ta]

seme

;

1.

Description

of

components.

.................:.00

13

3.

Gear

installing

position

.................cceeeeee

48

STRACK

No.

indicator

a

we

a

}

ae.

ta

-}

H

Fa

'

2.

CD

player

unit

(X32-137X-XX)

ccsccsscsese

15.

ADJUSTMENT...

PC

ter

th

Eh:

Eh

Ee)

(8)

fo}

3.

Set

mode

flOWChALt

sccscsscsscsctcteneecesee

17.

__—-

REGLAGE

preg

iar

a

pacers

(4)

[42]

(13)

(44)

[5

A.

Test

mode

.ecssesssssssssssssssscesssssssssssssnseneesseseees

18

ABGLEICH

occcscccssssscsssscssssssssssssssscsssessecsssssssseesee

1

Dise-outindicator

(Lis)

(47)

Ga)

[19]

20}

5,

Microprocessor

:PD75212ACW-052

PC

BOARD

(COMPONENT

SIDE

VIEW)

...............

55

:

’

(XB2-137X-XX

|

ICG)

...eseesecosesccsssescsssssrseeneee

24

PC

BOARD

(FOIL

SIDE

VIEW)

1

DISCncicator

‘

6.

RF

AMP.

CXA1081M

(X29-1890-05

:

1C1)...

26

SCHEMATIC

DIAGRAM

‘

7.

Servo

control

CXA1244S

EXPLODED

VIEW

(MECHANISM)

...........s+sssssssssss

6

|:

REPEAT

inaieater

;

(XB2-137X-XX

2

ICO)

cscssescccosssssssensseseesssees

28

EXPLODED

VIEW

(UNIT)

........ssssssssescsssessosecssseesess

7m

Siesan

repeat

idienter

satiate

8.

Digital

signal

processor

CXD11250Z

PARTS

LIST

\

:

'

(X32-137X-XX

+

1CZO)

aecccesscccosscscccsonsesessnsess

31

SPECIFICATIONS

on

EMPHASIS

indicator

EDIT

indicator

'

fo

<

Ties

tea

totale

deh

data

a

nace!

cinta

hie

ata

So

as

oh

age

a

cectee,

de

ae

ose

ee

Ss

J

Disc

tray

Remote

control

light

|

Numeric

keys

([1]-

[20/0].

[+10])

receiving

section

KENWOOD

coved

omc

eaves

of

70°6

STOP

key

(im)

SKIP

keys

((i@@]

.

[pei])

POWER

switch

OPEN/CLOSE

key

([4))

Play

mode

selector

PLAY/PAUSE

key

({E=>]}

(TRACK

mode,

PROGRAM

mode.

TIME

mode,

SINGLE

mode)

Play/pause

indicator

Manual

search

keys

(

(«<j

:

|

)

TIME

DISP.

REPEAT

OUTPUT

LEVEL

a&

CHECK

CLEAR

SPACE

EDIT

key

SPACE

key

REPEAT

key

OUTPUT

LEVEL

keys

({¥}.

[a])

CLEAR

key

Time

display

key

CHECK

key

DP-7010

SYSTEM

CONNECTIONS

Do

not

put

the

plug

into

the

socket

until

the

connecting

is

completed.

Connect

having

selected

one

of

@.

®

or

©

below.

Also

refer

to

the

manual

for

the

amplifier

to

which

the

connection

is

to

be

made.

An

accessory

audio

cord

7

Amplifier

An

optical

fiber

cable

DIGITAL

IN

OPTICAL

COAXIAL

AC

voltage

selector

switch

(except

for

some

areas)

DP-7010

To

wali

AC

outlet

A

digital

connecting

cord

DIGITAL

OUTPUT

OPTICAL

COAXIAL

G0

Remove

the

caps.

When

using

digital

output

terminals,

re-

move

the

protective

caps.

m

Conventional

amplifier

connection

(@)

Connect

output

terminal

(LINE

OUTPUT)

@

or

@

tothe

CD

input

terminal

of

the

amplifier

with

the

accessory

audio

cord

supplied.

@

Connection

to

an

amplifier

equipped

with

digital

input

(®

or

©)

Connect

COAXIAL

input

terminal

of

the

amplifier

to

the

DIGITAL

OUTPUT

COAXIAL

@

with

a

digital

cord.

or

connect

OPTICAL

input

terminal

of

the

amplifier

to

the

DIGITAL

OUTPUT

OPTICAL

@

with

an

optical

fiber

cable.

@

Fixed

output

(FIXED):

Output

voltage

is

fixed

to

2

Vrms.

Use

these

stereo

output

jacks

for

connection

to

@

typical

amplifier

or

receiver.

@

Variable

output

(VARIABLE)

.

The

output

level

of

the

head

phones

and

the

VARIABLE

output

lavel

can

be

changed

simultaneously

by

means

of

the

OUTPUT

LEVEL

keys

on

the

front

(.¥,.

[a))

or

remote

control.

The

output

levels

are

indicated

on

the

display.

Use

this

when

you

want

to

match

the

output

levels

with

other

equipment.

“

@

DIGITAL

OUTPUT

COAXIAL

This

terminal

is

for

outputting

the

audio

signals

in

the

original

digital

code.

Do

not

connect

it

to

anything

other

then

the

digital

input

terminal

of

the

amplifier

because

this

could

risk

damag-

ing

the

amplifier

and

speaker.

@

DIGITAL

OUTPUT

OPTICAL

This

terminal

is

for

converting

and

outputting

the

audio

signals

from

digital

to

optical.

Connect

it

to

the

digital

amplifier

attached

to

the

optical

input

terminal.

When

using

this

terminal.

remove

the

protective

cap.

SYSTEM

CONNECTIONS

OUTPUT

LEVEL

keys

([¥]

.[4])

KENWOOD

cowacr

se

ace

oro

Damper

Viewed

from

the

side

Hard

surface

Strut

suspension

Strut

suspension

adjustment

Dampers

are

provided

on

the

4

legs

of

this

unit

for

the

strut

suspension

{see

figure

above).

The

suspension

can

be

adjusted

by

attachment

or

removal

of

these

dampers.

Use

them

if

you

feel

they

are

required

for

sound

quality.

Turn

the

unit

over

when

attaching

or

removing

the

dampers.

We

recommend

that

you

do

not

place

other

components

on

top

of

this

unit

as

it

will

impair

the

suspension

effect.

@

Connecting

optical

fiber

cable

1.

When

connecting

the

optical

cable,

insert

it

straight

until

you

hear

it

click

into

place.

2.

Never

bend

or

tie

the

optical

fiber

cable.

Optical

fiber

cable

AK

©

-O-

3.

Not

all

optical

cables

available

on

the

market

can

be

used.

If

you

cannot

connect

up,

consult

the

store

where

you

bought

it

from

or

your

nearest

sales

outlet.

@

Connecting

power

cord

it

is

useful

to

connect

the

power

cord

for

this

unit

to

the

linking

power

socket

(SWITCHED)

of

an

amplifier.

(Except

for

some

areas)

PHONES

|

j

lv

OUTPUT

LEVELA

a

cae

|

Using

stereo

headphones

I

Plug

the

stereo

headphone

into

the

PHONES

terminal

and

.

adjust

with

the

OUTPUT

LEVEL

keys

(¥!,

@

to

get

the

desired

volume.

;

DP-7010

DISASSEMBLY

FOR

REPAIR

DISASSEMBLY

FOR

REPAIR

Remove

the

two

screws

(@),

then

disconnect

the

flexible

board

(@)

and

the

headphone

cable

(O)

from

their

connectors

on

the

main

board,

and

take

out

the

sub

panel

in

the

direction

of

the

arrow

towards

you.

1.

Removing

of

the

operation

unit

4.

*

Take

out

the

case

beforehand.

1.

Undo

the

two

catches

(@)

of

the

tray

panel,

then

detach

the

tray

panel

sliding

it

upwards

(@).

5.

Remove

the

three

screws

(@)

and

undo

the

six

catches

(

@),

then

take

out

the

operation

unit

in

the

direction

of

an

arrow.

2.

Push

in

the

tray

in

the

direction

of

arrow

|

@).

3.

Remove

the

four

screws

(

@)

in

the

downside

of

the

panel

and

the

two

screws

(@)

in

the

upside

of

the

panel,

then

undo

the

two

catches

(

@)

in

the

upside,

and

take

out

the

front

panel

in

the

direction

of

an

arrow

towards

you.

DP-7010

DISASSEMBLY

FOR

REPAIR

2.

Removing

the

tray

1,

With

the

tray

open,

turn

off

the

power

beforehand.

2.

Push

in

the

tray

slowly

by

a

hand

(@).

In

this

situation,

the

gear

is

free

(@).

3.

Push

the

tray

towards

you

and

draw

out

the

tray

(

@).

4.

Push

down

off

the

two

catches

(@)

of

the

tray

stopper,

and

draw

out

the

tray

in

the

direction

of

an

arrow.

5.

When

removing

the

tray,

detach

it

in

the

direction

of

arrow

{@)

in

which

it

can

be

detached

without

the

sub

panel

caught

by

the

tray

stopper.

2-1.

When

the

power

is

not

turned

on

or

when

the

1.

=

Nn

.

Thereby,

the

gear

will

be

free

with

the

tray

slightly

.

Installing

the

tray

.

Set

to

location

(

@)

the

protrusion

on

the

upper

side

DISASSEMBLY

FOR

REPAIR

tray

does

not

come

out

even

by

pressing

the

OPEN

key

Push

the

lever

by

a

screwdriver,

etc.

put

in

through

a

slit

on

the

bottom

plate

of

the

product

as

shown

on

the

right

(@).

advanced.

Thus,

draw

out

the

tray

towards

you

(@).

Otherwise,

as

previously

stated

in

step

3.

of

''2.

Removing

the

tray'’,

push

the

tray

towards

you

and

draw

out

the

tray.

of

the

gear

as

shown

on

the

right.

Push

in

the

tray

along

the

left

and

right

guides.

DP-7010

DISASSEMBLY

FOR

REPAIR

4.

Removing

the

pickup

*

Take

out

the

tray

beforehand.

1.

Remove

the

two

screws

(@),

then

take

out

the

metal

piece

of

the

clamper

in

the

direction

of

the

arrow.

2.

Remove

the

cut

washer,

then

take

out

the

gear

(

@).

3.

Detach

the

two

fixtures

(

@).

Note

1:

When

installing

the

pickup

Perform

the

installation

in

such

a

manner

that

the

metal

piece

comes

into

engagement

with

the

guide

section

of

the

pickup

(

@).

Separate

the

parallel

cords

running

out

of

the

pickup

as

much

away

from

each

other

as

possible

(

©).

Note

2

:

When

replacing

the

pickup

As

to

the

pickup

(J91-0372-05)

supplied

as

a

service

part,

its

LD

short

land

(@)

is

solder-shorted

for

the

laser

diode

(LD)

protection.

Thus

when

replacing

the

pickup,

unsolder

the

LD

short

land

after

the

connec-

tion

with

the

connector.

Wire

clamper

DP-7010

D

BLOCK

DIAGRA

CONTROL

CIRCUIT

UNIT

(X29-1890-05)

CD

PLAYER

UNIT

(X32-137X-XX)

|

ALPC

[oS

ee

—

poe

ee

Fl

Tg

Ce

pe

eae

ee

eee

yg

+5V

“|

RFO

RFI

[

LC1/2),

042

1c168

e

|

7,8

WAVEFORM

EFM

SHAPER

DECODER

|

MIRR

DETECTOR

FOK

DETECTOR

DEINTERLEAVE

TIME

BASE-~

GENERATOR

TIME

BASE-

CORRECTOR

SIGNAL

PROCESSING

SYSTEM

CONTROL

E,F

DETECTOR

FRAME

SYNC

DECODER

SUBCODE

OECODER

TRACKING

COUNTER

BUS

INTERFACE

7

SENSE

FOK

Ict6

(pPD75212ACW-052)

MICROPROCESSOR

Ll

ASG:

18.20

i

IC10

(CXA1244S)

1ctS(2/2),

z

LOMBARATOR

Q1,2

4

bo

F.C

DRIVER

|%

a

ww

w

-

ie

LP

jouteur

Dn

INTERFACE

T2c

COMPARATOR

12

FASTFEED

Q41

(STA34IM)

1¢22(2/2)

6

4

i¢

6

T.C

DRIVER

FM

(FEED

MOTOR)

7

3

ORIVER

Ici5(t/2)

TM

(

TRAY

MOTOR)

8

2

|

2,3

TRAY

DRIVER

O.M

(

)

(DISC

MOTOR}

CLV

DRIVER

IchH{2/2)

Q3,4

ee

SS

A

eS

0

DP-

7010

CK

DIAGRAM

)

{C14

(SM5813AP)

ICI9

D.P.A.C.

DIGITAL

PULSE

AXIS

CONTROL

OIL

DLO

DIGITAL

FILTER

OIN

DOL

DEINTERLEAVE

TIME

BASE-

GENERATOR

TIME

BASE-

DATA

INTER-

POLATION

OoR

DIR

AMP21

OLR

CORRECTOR

SIGNAL

PROCESSING

SYSTEM

CONTROL

MASTER

CLOCK

GENERATOR

CIRC

ERROR

q

16.9344MHz

T

CORRECTION

1022

(172)

31,32

VRS

23,24

VOL.

UP/OOWN

©)

7,10

37,38

Q33~35

-_{F]

0

Icl6é

(yPO752IZACW-052)

MICROPROCESSOR

35,36

QI7

13

RMUT

sw

(8)

1@~20

9

ee

Ic?

{c3

Ics

1c5

(PCMS8P}

(172)

{2/72)

e

LINE

eae

ev

LPF

OuT

CONVERTER

CON.

AMP

1c8

1c2

1c4

(PCM58P)

(172)

/

-

LINE

Oo”

tv

LPF

OUT

CONVERTER

CON.

AMP

1c4

(272)

Ic!

(TC74HCOOP)

DIGITAL

OUT

AMP

OPERATION

UNIT

(X25-3510-01)

|

[-

Page

ee

oe

eet

FL

KEY

OISPLAY

MATRIX

VRT7

REMOTE

CONTROL

SS

Sg

ee

eee

eo

a

ae

oe

+5V

-l2V +12V

ANALOG

-12V

+7.5V

+5V

-30V

3v

>

0

'

DIGITAL

POWER

SUPPLY

LINE

OUTIL)

FIXEO

VARIABLE

©

1c

3(2/2)

Q19,20

p

-

HEADHONES

AMP

e

O

1c2¢2/2)

Q20,22

LINE

OUTIR)

FIXED

Seba

eee

hoe

ew

VARIABLE

O

OIGITAL

OUT

COAX

TAL

OP-7010

12

DP-7010

CIRCUIT

DESCRIPTION

1.

Description

of

components

1-1,

OPERATION

UNIT

(X25-3510-01}

Ref.

No.

Part

No.

Use/Function

Operation/Condition/Compatibility

1C1

LB1433N

|

Level

meter

IC

FL

tube

level

indicator

driver.

rai

2SC3666

Ripple

filter

+5.6V

regulated

power

supply.

Q2~6

DTC124EN

Digital

transistors

Level

indicator

selection

switch.

Q7~11

2S$C1740S(Q,R}

Drivers

of

grids

G2,

G3,

G4,

G5

and

G8.

Q12~15

2SC1740S(Q,R)}

Orivers

1-2.

CONTROL

CIRCUIT

UNIT

(X29-1890-05)

Drivers

of

each

mode

lamp.

Part

No.

Use/Function

Operation/Condition/Compatibility

C1

CXA1081M

RF

amplifier

Generation

of

focus

error

signal,

generation

of

tracking

error

signal,

generation

of

RF

signal

and

its

phase

compensation,

and

auto

asymme-

try

correction.

2SA1426

LD

switch

Laser

diode

B

line

supply

switch.

2SC945(AQ,P)

FE

switch

—T

Focus

error

amplifier

bias

selection

switch.

1-3.

CD

PLAYER

UNIT

(X32-137X-XX)

0-11:

,P

0-21:

U,M,UE

2-71:

X,T.E

Ref.

No.

Part

No.

Use/Function

Operation/Condition/Compatibility

ICt

TC74HCOOP

Digital

out

driver

Digital

output

buffer

amplifier,

and

power

ON/OFF

reset

signal

genera-

tion.

1€2,3

NJM4565D

LV

conversion

(1/2)

:

Conversion

of

D/A

converter

current

output

into

a

voltage

form.

(2/2)

:

Headphone

amplifier.

IC4

NJM4565D

Operation

amplifier

(1/2)

:

Roh

20kHz

LPF.

(2/2)

:

Reh

output

buffer

amplifier.

1c5

NJM4565D

Operation

amplifier

(1/2)

:

Leh

20kHz

LPF

{2/2)

:

Lch

output

buffer

amplifier.

Icé6

M5218P

Operation

amplifier

Error

amplifier

of

+12V

regulated

power

supply.

IC7,8

PCM58P

O/A

converter

Conversion

of

18-bit

digital

data

into

an

analog

form.

Ico

M§218P

Operation

amplifier

{1/2)

:

Error

amplifier

of

-12V

regulated

power

supply.

{2/2)

:

Error

amplifier

of

+5V

regulated

power

supply.

1C10

CXA1244S

Servo

IC

For

each

of

focus,

tracking

and

sled

servo

controls.

Ic11

~

|

NUM4558D

PLL

(1/2)

:

The

phase

comparison

signal

from

11

(PDO)

of

the

digital

signal

processing

LSI

(CXD1125Q2Z)

is

input

in

try

state,

and

this

!C

controls

the

varicap

voltage

by

that

output.

CLV

servo

(2/2)

:

This

IC

controls

the

disc

motor

speed

by

four

outputs

MON,

MDP,

MDS

and

FSW

of

the

digital

signal

processing

LSI

(CXD1125Q2).

MON

.....

Disc

motor

ON/OFF

Disc

motor

rough

control

and

phase

control

|

Disc

motor

speed

control

FSW.....

Disc

motor

filter

time

constant

selection

IC12

M5218P

Operation

amplifier

Error

amplifier

of

+5V

regulated

power

supply

(for

IC19

(D.P.A.C)).

IC13

TC74HCO4P

Clock

pulse

oscillation

Generation

of

master

clock

pulse

(16.9344MHz).

C14

|

SM5813AP

Digital

filter

8x

over-sampling

(18-bit).

IC15

NJM4558D

Operation

amplifier

(1/2)

:

Tray

OPEN/CLOSE

voltage

control.

|=

(2/2)

:

Focus

actuator

phase

compensation

amplifier.

IC16

wPD75212ACW-052

|

Microprocessor

Display,

each

key

input

process

and

servo

IC

control.

(C18

CXK5816SP-15L

Static

RAM

EFM

demodulation

data

time

axis

correction

16K

S-RAM.

{C19

TC17G008AF-8060

O.P.A.C

|_

Digital

Pulse

Axis

Control

(Refer

to

page

42.}.

1C20

CXD11250

Digitat

signal

processing

IC

Bit

clock

pulse

regeneration

by

EFM-PLL

circuit,

EFM

data

demodula-

C€XD11250Z

tion,

and

frame

sync

signal

detection,

protection

and

interpolation.

1C22

NJM4558D

Operation

amplifier

(1/2)

;

Electrically

driven

VR

up/down

voitage

generation.

190)

.

Trasking

actustar

deve

bother

13

14

DP-7010

CIRCUIT

DESCRIPTION

Ref.

No.

Part

No.

Use/Function

Operation/Condition/Compatibility

Qi

288941

|

Driver

Focus

actuator

drive

current

booster.

Q2

|

2SC3940A

Driver

|

Focus

actuator

drive

current

booster.

Q3

2SD1266(Q,P)

Driver

Disc

motor

drive

current

booster.

Q4

2SA1534A

Driver

Disc

motor

drive

current

booster.

a5

DTC124EN

Switch

Controls

the

bias

switch

of

the

focus

error

signal

by

signal

SENS,

and

also

controls

the

focus

gains

FS3

of

the

servo

IC.

a6

2SK246(Y,GR)

Switch

Controlled

by

the

defect

control

switch

(Q8).

When

flaw

is

detected,

06

turns

OFF

to

open

the

focus

servo

loop.

|

Q7

2SK246(Y,GR}

{

Switch

Controlled

by

the

defect

control

switch

(Q8)

in

the

same

manner

as

Q6.

When

flaw

is

detected,

Q7

turns

OFF

to

open

the

tracking

servo

loop.

as

2SA733(AN(Q,P)

Switch

Controls

the

defect

detection

switch,

and

the

switches

Q6

and

Q7

for

2SA933S(Q,R)

focus

and

tracking

errors.

When

flaw

is

detected

:

OFF,

At

normal

play

:

ON

(Inverted

logic

of

signal

DEFECT)

ag

2SC945(A}(Q,P)

;

Switch

Inputs

the

tracking

error

signal

to

ATSC

(anti-shock)

through

BPF

to

28C€1740S(Q,R)

prevent

sound

jump

due

to

shock

by

external

disturbance.

Q10

2SA733(ANQ,P)

Power

supply

FL

tube

reference

voltage

supply

{(-30V).

2SA933S(Q,R)

Qi1

2SA1534A

Power

supply

FL

tube

reference

voltage

supply

(-30V).

|

Q12

2SA733(A)(Q,P)

Power

supply

-5V

digital

power

error

amplifier.

2SA933S(Q,R}

Q13,14

2SA954(L,K)

Ripple

filter

For

-5V

regulated

power

supply.

Q15,16

2SC945(ANQ,

P)

Reset

Power

ON/OFF

reset

pulse

generation.

2SC1740S(Q,R)

Q17

2SA733(AQ,P)

Switch

Output

muting

relay

driver.

Q18

2SC2003(L,K)

i

Ripple

filter

For

+12V

regulated

power

supply.

Q19

2SC2003(L,K)

}

Oriver

Headphone

amplifier

driver

(Lch).

|.a20

|

2scz003(L.K)

|

Driver

|

Headphone

amplifier

driver

(Roh).

Q30

2SA954(L,K)

Ripple

filter

For

-12V

regulated

power

supply.

Q31

2SC3666

Driver

Electrically

driven

VR

current

booster.

Q32

2SA1426

Driver

Electrically

driven

VR

current

booster.

033,34

2S8C2878(B)

Switch

De-emphasis

switch,

which

is

controlled

by

digital

transistor

Q35.

{De-emphasis

“'H"

:

ON)

Q35

DTA124EN

Digital

transistor

switch

Controlled

by

14

of

microprocessor.

{At

emphasis

:

ON)

Q36

2SB722(Q,P,E)

|

Ripple

filter

For

+5V

regulated

power

supply.

Q37

2SC2003{L,

K)

Ripple

filter

For

+5V

regulated

power

supply

(for

D.P.A.C).

Q38

|

2SD1266(Q,P)}

i

Ripple

filter

For

+5V

regulated

power

supply.

a39

2SD1266(Q,P)

i

Ripple

filter

For

+7.5V

regulated

power

supply.

2SC2003iL,K}

|

Ripple

filter

For

-12V

regulated

power

supply.

Q41

STA341M

Driver

(1/3)

:

Tray

motor

driver.

!

(2/3)

:

Feed

motor

driver.

(3/3)

:

Tracking

coil

driver.

DP-7010

CIRCUIT

DESCRIPTION

2.

CD

player

unit

(X32-137X-XX)

+

D.P.A.C

(Digital

Pulse

Axis

Control)

circuit

Two

different

distortions

are

attendant

on

the

con-

version

of

the

digital

signal

into

an

analog

signal.

One

is

a

distortion

on

the

level

axis

(voltage

axis),

which

is

determined

mainly

by

the

resolution

of

the

D/A

con-

verter,

and

in

case

of

using

a

ladder

resistor

type,

by

its

error,

The

other

is

a

distortion

on

the

time

axis,

which

is

not

so

prevailing

as

to

appear

on

the

distortion

meter

but

has

e————-€

Original

Sound

. —

—.__

x

Regenerated

ms

*

Waveform

Fig.

2-1

Error

(distortion)

on

voltage

axis

Next,

let

us

deal

with

the

theory

of

the

D.P.A.C

operation

by

a

basic

D.P.A.C

circuit

of

this

time.

Also

when

the

latch

signal

©

from

the

digital

filter

is

disturbed,

an

accurate

latch

signal

like

©

can

be

ob-

Latch

signal

(WCKO)

from

digital

filter.

©

8.4672MHz

great

influence

on

the

sound

quality.

It

is

the

D.P.A.C

that

is

to

operate

as

a

circuit

to

improve

this

point.

Figure

2-1

shows

the

error

(distortion)

on

the

voltage

axis

of

the

D/A

converter

output

for

the

original

sound,

and

Figure

2-2

shows

the

error

(distortion)

on

the

time

axis

of

the

D/A

converter

output

for

the

original

sound.

As

seen

from

this,

even

with

a

variation

in

time

axis,

there

appears

a

regenerated

waveform

different

from

the

original

sound.

e——————-@

Origina!

Sound

Regenerated

Woveform

Fig.

2-2

Error

(distortion)

on

time

axis

tained

at

the

rise

of

the

master

clock

pulse

©).

By

virtue

of

this

latch

signal,

a

proper

voltage

signal

is

output

from

the

D/A

converter.

Latch

signs

[>

to

D/A

converter.

8

AGT2MHz

I

®

H

‘

I

Latch

signal

from

digital

filter.

1

\

‘

{8.4672MHz}

1

‘

:

\

I

!

Master

clock

pulse.

(16.9344MH2)

H +

©

Latch

signal

to

D/A

converter.

(8.4672MH2)

Fig.

2-3

D.P.A.C

basic

circuit

Kenwood DP-7010 User manual

Popular CD Player manuals by other brands