Marantz CD-4 Spezifikationen PDF herunterladen (Seite 9)

I

OPERATION

NOTES

,FUNCTIONAL

QESCRIPTION

1. Separation

Adjustment

In

the

CD-4 record two

sigAals

are superimposed

Once

the

separation controls are set

they

on

each wall

of

the

same groove. One

is

the

SUM

should

not

need readjustment until

the

car-

SIGNAL

LF

+

La

(or

RF

+

Rs).

The

other

is

a

tridge

and/or

stylus

is

replaced.

30

KHz carrier modulated itl frequency by

the

2.

Anti-Skating

DIFFERENCE SIGNAL

LF

-

L8

(or

RF

.:.

Rs).

For

optimum

results

with

the

CD-400B,

the

Referring

to

the

block diagram of Figure 5,

the

anti-skating force

on

the

turntable

should

be

compositesignal picked up

b¥

the

phone

cartridge

carefully adjusted in, accordance with

the

~,

is

first passed through a circuit which provides

manufacturer's instructions.

standard RIAA equalization. Its

output

signal

is

3. Cartridges

split into

two

different paths: One

path

goes

Only a magnetic cartridge designed for CD-4

through a Low Pass filter

that

lets only

the

sum

reproduction will provide usable playback re-

signal through

to

the

·mixing circuit while stop-

sults.

The

cartridge must be

mounted

per-

ping

the

carrier. A separation

adjustmentis

included

pendicularto

the

record surface. See Figure 4. '

in

this path

to

compensate for

the

variation

:in

The stylus must be

kept

clean. Consult

your

output

level from different cartri.dges.

The

bther

dealer

for

cleaning accessories.

path

.takes

the

signal through a

High

Pass Filter

4. Turntable Leads

which blocks

the

sum

signal,

but

allows

the

Only coaxial

audio

cables designed for CD-4

modulated high frequency carrier

-to

be presented

use should be used. Consult

your

dealer for

the

to

the

FM

Detector,

after

amplification

to

proper type.

the

proper level. There,

the

difference signal

is

recovered (detected) by means

of

a low distortion

5.

TV Interference

A TV

set

located near

the

CDA

record player

Phase Locked Loop circuit.

The

30

kHz level

is

may interfere with playback

of

CD-4 discs.

automatically adjusted

to

suit

different

types

of

If

this should occur, either

turn

off

the

TV

or

cartridges

and

set-up conditions.

move

the

record player away from

the

TV.

The Low Pass filter

that

follows

the

FM

detector

6. Record Care

suppresses

any

vestiges of

the

high frequency

CDA records require cleanliness. Keep

them

carrier, leaving only

the

original difference signal.

away from dust, dirt and cigarette smoke.

fn

recording,

the

frequency response

of

the

differ-

Clean

them

with a high quality record clean- ence signal

is

modified

to

improve signal-to-noise

ing device before playing and before storing.

ratio and crosstalk. The circuits labelled De-

Do

not

use solvents or water because

they

will

emphasis and

AN

RS

in

the

CD-400B block diagram

increase noise

on

the

discs.

WRONG

\

\

..

\

I

,--

I

I

-,

I

V

,

\

I

J RECORD

SURFACE

--

-,

.

are intended

to

restore

the

original response

of

Figure

4.

Cartridge

Mounting

RIGHT

r---WRONG

I

I

CARTRI.DGE

~

I

RECORD

__

..

SURFACE

--:-;-""'-_J

SU

RECORO

AFACE .

90°

a..-_~

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