Marantz CD-73 User manual

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CD-73

VA

7

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model

CD-73

TABLE

OF

CONTENTS

SECTION

PAGE

Re

EN

TRODUGTIONS

Sosiuteucie

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hank

hws

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ew

aca

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ag

1

3.

DRAWER

MOTOR

CONTROL

P.W.

BORAD

WORKING

PRINCIPLE

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

2

4.

ADJUSTMENT

PROCEDURES

FOR

DISC

CLAMPER

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

0.0.00

ccs

eeeuuee

3

5:

VOLTAGE

CONVERSION:

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4

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BLOCK:

DIAGRAM

202

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5

7.

COMPONENT

LOCATIONS

(AND

WIRE

CONNECTIONS)

...................0.00.-0000

6

8.

DIAGRAM

AND

COMPONENT

LOCATIONS

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

0.0.0:

c

cece

e

eee

e

ees

8

8.1

Servo

(P200)

Schematic

Diagram

and

Component

Locations

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

20000

e

eee

eens

8

8.2

Decoder

(P500)

Schematic

Diagram

and

Component

Locations

....

2.0.0.0.

c

eee

eens

13

8.3

Power

Supply

(P100)

Schematic

Diagram

and

Component

Locations

..........-

0-0.

e

eee

ees

18

8.4 Pre

Amp.

+

Laser

(AY40)

Schematic

Diagram

and

Component

Locations

......-.

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19

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EXPLODED

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AND:

PARTS

LIST

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“TECHNICAL.

SPECIFICATIONS

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Im

3585

MODEL

CD-73

COMPACT

DISC

PLAYER

1.

INTRODUCTION

This

service

manual

was

prepared

for

use

by

Authorized

Warranty

Stations

and

contains

service

information

for

Marantz

Model

CD-73

Compact

Disc

Player.

Servicing

information

and

voltage

data

included

in

this

manual

are

intended

for

use

by

the

knowledgeable

and

ex-

perienced

technician

only.

All

instructions

should

be

read

carefully.

No

attempt

should

be

made

to

proceed

without

a

good

understanding

of

the

operation

of

the

Compact

Disc

Player.

The

parts

list

furnishes

information

by

which

replacement

parts

may

be

ordered

from

the

Marantz

Company.

A

simple

description

is

included

for

parts

which

can

usually

be

ob-

tained

through

local

suppliers.

Mm

3586

2.

P.W.

BOARDS

.

Power

Supply

.

Servo

.

Disc

Inside

Indicator

.

Program

Key

Switch

.

Mode

Key

Switch

...

.

Signal

Relay

2

.

Display

...........

.

Mode

Indicator

.

Signal

Relay

1

WON

AKHAWNS

=

Ey

s

n

a

o

g

=

oO

—

a

N

=a

—

w

=

po

.

Pre

Amp.

+

Laser

...

mounted

on

P.W.

mounted

on

P.W.

mounted

on

P.W.

mounted

on

P.W.

mounted

on

P.W.

mounted

on

P.W.

«mounted

on

P.W.

mounted

on

P.W.

mounted

on

P.W.

mounted

on

P.W.

mounted

on

P.W.

mounted

on

P.W.

mounted

on

P.W.

-mounted

on

P.W.

Board

P100

Board

P200

Board

P500

Board

P800

Board

PHOO

Board

PROO

Board

PR50

Board

PSOO

Board

PUOO

Board

PU50

Board

PYOO

Board

PZ00

Board

PZ50

Board

AY40

3.

DRAWER

MOTOR

CONTROL

P.W.

BORAD

WORKING

PRINCIPLE

Drawer

motor

control

P.

W.

Borad

includes

the

following.

(1)

Drawer

motor

drive

circuit

(2)

Remote

control

circuit

(Marantz

Bus

System

decoder

circuit)

3.1

Drawer

Motor

Drive

Circuit

A.

Outline

of

the

system

This

circuit

revolves

and

reverses

the

drawer

motor

by

the

OPEN/CLOSE

switch

of

S802

on

the

front

panel

to

open

and

close

the

drawer.

It

includes

a

circuit

to

increase

starting

torque

and

a

safety

circuit

which

stops

automatically

when

something

is

caught

in

the

drawer.

B.

Operation

of

each

part

a)

Q809,

Q808

and

Q807

are

motor

drive

circuits.

Especially

Q808

increases

motor

starting

torque.

b)

When

the

voltage

of

R820

becomes

over

about

0.6V,

the

base

current

begins

to

flow

through

Q803.

That

is,

the

motor

is

locked

to

detect

the

excessive

current.

c)

Q805

and

Q806

make

up

a

set/reset

flip

flop,

which

is

set

whell

positive

voltage

is

put

into

the

base

of

Q805.

And

it is

reset

when

the

base

becomes

0.

As

long

as

it is

set,

D806

is

‘ON’

and

motor

drive

circuit

does

not

operate.

d)

Q802

becomes

“ON’’

just

for--a

few

msec

when

the

OPEN/CLOSE

switch

of

S802

is

pushed.

(S802

is

non-shorting

type.)

OPENSCLOSE

Vv

|

\

!

e)

Q801

becomes

“ON’’

just

for

the

time-constant

t4

based

on

R816/R801/C801only

afterS802

is

changed

from

CLOSE

to

OPEN,

and

makes

the

base

of

Q809

OV

to

stop

the

motor

drive

circuit.

Meanwhile,

the

voltage

of

C807

is

discharged

to

increase

the

torque

for

the

time-constant

t

of

C807/

R822

just

after

the

end

of

ty.

.

Explanation

of

overall

operation

a)

During

the

shift

of

OPEN/CLOSE

switch

S802,

from

OPEN

to

CLOSE,

Q802

becomes

“ON”

in

an

instant

and

flip

flop

which

is

composed

of

Q805

and

Q806

is

reset

to

cut

off

D806.

b)

Consequently

motor

drive

circuit

which

is

composed

of

Q809,

Q808

and

O807

begins

to

operate

to

switch

on

the

drawer

motor.

c)

When

the

drawer

comes

to

the

mechanical

end,

short-circuit

current

begins

to

flow

to

the

motor

to

generate

voltage

of

R820

about

1V.

This

voltage

reverses

Q803

to

cut

off

D804.

After

D804

is

cut

off,

C805

is

discharged

through

R807

and

Q804,

and

Q804

becomes

OFF

after

about

2.5

sec.

As

a

result,

the

collector

voltage

of

Q804

rises

to

set

the

above

flip

flop

through

R809/R810.

In

this

way,

the

motor

drive

circuit

becomes

OFF

again.

f)

You

have

the

same

operation

also

when

S802

is

changed

from

CLOSE

to

OPEN.

But

Q801

has

been

added

so

that

Q808

which

increases

start

up

torque

can

become

ON

without

fail.

d

e

CLOSE>OPEN

Vv

t

|

!

|

Q802

Collector

|

if

| |

Sf

Motor

Current

I

!

}

|

(\

|

I

|

R820

Voltage

ae

CLOSE

Joo

nm

a

Position

DRAWER

Position

OPEN

Position

!

|

i

|

}

I

|

!

I

|

3.2

Remote

Control

Circuit

A.

Outline

of

the

system

Marantz

Bus

System

is

a

general

term

to

this

remote

contro!

circuit.

Remocon

transmitter

and

remocon

receiver

are

necessary

to

operate

it.

The

output

of

the

remocon

receiver

is

connected

to

the

remocon

“IN”

terminal

on

the

rear

panel

of

the

CD-73.

The

remocon

transmitter

has

4

keys

for

play/next,

puase,

repeat

and

stop.

B.

Operation

of

each

part

a)

Q851

is

N

channel

Micro

Processer

for

remocon.

b)

Q857

amplifies

a

signal

from

the

remocon

receiver

and

transmits

it

to

24

of

the

Micro

Processer.

c)

O858

is

a

transistor

switch.

When

a

laser

signal

‘“S”

becomes

Low

level,

it

switches

‘“‘ON’’

and

changes

the

Micro

Processer

25

to

High

level

to

generate

an

easy

operation

signal

at

19.

This

easy

operation

signal

is

reversed

at

Q856

and

put

out

from

the

easy

“OUT”

terminal

of

the

CD-73.

This

signal

makes

easy

operation

possible.

Q853,

Q854

and

Q855

are

used

as

analogue

switches

and

controled

by

output

9,

10

and

15

respective-

ly.

Q852

is

a

transistor

switch,

which

lowers

a

sense

signal

to

GND

level

to

stop

operation.

R852/D851/C856

are

used

for

initial

setting

of

the

Micro

Processer.

d

—

e

C.

Overall

operation

When

any

key

of

the

remocon

transmitter

is

pushed,

a

pulse

signal

is

transmitted

to

the

CD-73

remote

“IN”

terminal

through

the

remocon

receiver.

This

signal

is

put

into

the

Micro

Processer

24

after

being

amplified

at

Q857

and

the

Micro

Processer

comes

to

correspond

to

the

key

to

generate

High

signal

at

the

output

as

follows.

play/next

........

ping

pause

...........

10

repeat...

.........

15

STOP

s(inane

eae

4d

pin4

Besides,

only

when

the

play/next

key

is

pushed,

an

easy

Operation

signal

occurs

at

19

for

60

msec

to

mute

the

other

sources.

m

3588

4.

ADJUSTMENT

PROCEDURES

FOR

DISC

CLAMPER

4.1

Adjusting

the

height

of

the

pressure

ring

holder

The

height

of

the

holder

must

be

adjusted

to

maintain

braking

by

keeping

the

appropriate

distance

between

the

holder

and

pressure

ring.

With

the

drawer

in

the

unit,

lift

the

holder

manually,

and

place

the

positioning

tool

on

the

turntable.

If

the

drawer

is

in

the

“out”

position,

the

alminum

cap

will

come

in

contact

with

the

front

chassis

and

front

panel,

and

will

be

scratched

when

the

drawer

is

pushed

into

the

unit.

With

a

screwdriver,

turn

the

adjustment

screw

clockwise

2

or

3

turns.

Push

down

the

holder

several

times

to

confirm

that

it

sinks

a

few

milimeters

until

it

makes

contact

with

the

positioning

tool.

If

there

is

no

play

between

the

holder

and

tool,

turn

the

adjustment

screw

further

until

a

few

milimeters

play

is

obtained.

Turn

the

adjustment

screw

counterclockwise

until

the

play

between

the

holder

and

tool

becomes

zero.

For

optimum

adjustment,

do

not

exert

excess

pressure

on

the

acdiustment

screw

with

the

screwdriver.

Apply

lock

paint

to

the

adjustment

screw.

Lift-the

holder

with

the

drawer

in

the

“in”

position,

and

remove

the

positioning

tool.

5.

VOLTAGE

CONVERSION

@

EUROPEAN

MODEL

ONLY

To

convert

the

unit

to

a

different

power

source

voltage,

change

the

position

as

illustrated

in

the

drawing

below.

CAUTION

DISCONNECT

POWER

SUPPLY

CORD

FROM

AC

OUTLET

BEFORE

CONVERTING

VOLTAGE.

Voltage

Conversion

Chart

240V

~

120V

~

220V

~

Hi0V

~

VOLTAGE

SELECTOR

Note

on

safety:

Symbol

/\

Fire

or

electrical

shock

hazard.

Only

orignal

parts

|

should

be

used

to

replace

any

part

marked

with

symbol

“\

.

|

Any

other

component

substitution

(other

than

original

|

type),

may

increase

risk

of

fire

or

electrical

shock

hazard.

F

m

35.84

6.

SIGNAL

BLOCK

DIAGRAM

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AQddNS

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7.

COMPONENT

LOCATIONS

(AND

WIRE

CONNECTIONS)

YE

REMOTE

JACK

CO

OUT

JACK

DECODER

PW.

BGARD

(P500)

Nee

|

“nem

fi

:

bbe)

Se

PRE

AMP

+LASER

CE

‘a

ASSY

(/

em

¢

:

(AY40)

me

|

ae

ii

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yo

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—

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ha

y

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alg.

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cyl

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BLK

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DRAWER

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SELECTOR

Jog!

For(N,T,A)

VERSION

Bw

~

&

LK

POWER

P.W.

BOARD

(P100)

wa

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PHOQ

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atx

FOO!

yoo!

To

vs02

<=

8.

DIAGRAM

AND

COMPONENT

LOCATIONS

8.1

Servo

(P200)

Schematic

Diagram

and

Component

Locations

RADIAL

ERROR

|

A274]

C274

(A174)

.

SERVO

P.W.

BOARD

(P200

1/2)

getatvayic)

+2

on

(0474)

a

a2i2(1/4)(8)

#d

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i

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aay

d

+

(Arn)

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HEF40708

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244

9.4E

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c287

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1000n}

RADIAL

:

WIR3E2

MOTOR

|

er

.

a

C233

a

v

‘

R386

aon

(e33K

C2324

232°

_

(4132)

R291

srs

-!

H

a2iaa/4na)

€

R300

LM324

[tLovl

R302

|,

=

2.2k)

SERVO

P.W.

BOARD

(P200

2/2)

Ri

8

R230

[470K]

BPR

ALA

alze)

R240

'

c2i1

100n

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FOCUS

R222

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MOTOR

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+1

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(S

231

VY

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(#22k]

0208(1/2KB)

eos

|

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MC1458

8

é

ERROR

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a

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Marantz CD-73 User manual

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