NAD 5420 Manual de usuario

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3

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SERVICE

NAD

[MANUAL

9420

9429

‘

reve)

Vea

,

DISC

PLAYERS

~

SAFETY

INFORMATION

CAUTION

CAUTION-

INVISIBLE

LASER

RADIATION

WHEN

OPEN

AND

INTERLOCKS

DEFEATED.

AVOID

EXPOSURE

TO

BEAM.

VORSICHT!

UNSICHTBARE

LASERSTRAHLUNG

TRITT

AUS.

WENN

DECKEL

GEOFFNET

UND

WENN

SICHERHEITSVERRIEGELUNG

UBERBRUCKT

IST.

NICHT

DEM

STRAHL

AUSSETZEN!

VARNING-

OSYNLIG

LASERSTRALNING

NAR

DENNA

DEL

AR

OPPNAD

OCH

SPARR

AR

URKOPPLAD.

STRALEN

AR

FARLIG.

.

ADVARSEL-

USYNLIG

LASERSTRALING

VED

ABNING.

NAR

SIKKERHEDSAFBRYDERE

ER

UDE

AF

FUNKTION.

UNOGA

UDSAETTELSE

FOR

STRALING.

ATTENTION-

RAYONNEMENT

LASER

ET

ELECTROMAGNETIQUE

DANGEREUX

SI

OUVERT

AVEC

LU’

ENCLENCHEMENT

DE

SECURITE

ANNULE.

CLASS

1

LASER

PRODUCT

The

lightning

flash

with

arrowhead,

within

an

equilateral

The

exclamation

point

within

an

equilateral

triangle

is

intended

triangle,

is

intended

to

alert

the

user

of

the

presence

of

to

alert

the

user

of

the

presence

of

important

operating

and

uninsulated

“dangerous

voltage”

within

the

product's

encio-

maintenance

(servicing)

instructions

in

the

literature

sure;

that

may

be

of

sufficient

magnitude

to

constitute

a

accompanying

the

appliance.

risk

of

electric

shock

to

persons.

|

-

-

THIS

DEVICE

COMPLIES

WITH

PART

15

OF

THE FCC

RULES.

j

OPERATION

!S

SUBJECT

TO

THE

FOLLOWING

TWO

CONDITIONS:

ats

(1)

THIS

DEVICE

MAY

NOT

CAUSE

HARMFUL

INTERFERENCE,

AND

4

(2)

THIS

DEVICE

MUST

ACCEPT,ANY

INTERFERENCE

RECEIVED,

INCLUDING

INTERFERENCE

THAT

MAY

CAUSE

UNDERSIRED

OPERATION.

.

.

Ba

.

aes

|

hn

REAR

PANEL

CONNECTIONS

i

AEA

mama

AISQUE

DE

CHOC

TENTIO

:

PAS

OUVAIA

1

OERERA

QUTANSE

ry

CAPACITAOO

PARA

LAS

LINE

OUT

1.

OUTPUT

JACKS

2.

AC

LINE

CORD

FRONT

PANEL

10

(5425

ONLY)

9

Compact

Disc

Player

5425

SKIP

SCAN

a

ha

|

]o

ese

eam

<<

(0

im)

>

in)

an

CLOSE

PLAY

PAUSE

iT

PROGRAM

REPEAT

OO

Oo

=

=

1

2

3

4 5 6

7

8

1.

POWER

ON/OFF

2.

DISC

DRAWER

3.

OPEN/CLOSE

4,

PLAY/PAUSE

5.

STOP

6.

PROGRAM/DISPLAY

7.

REPEAT

8.

SKIP/SCAN

9,

DISPLAY

10.

REMOTE

RECEIVER

(5425

ONLY)

©

1990.

NAD

Electronics

Ltd.

©

1990.

NAD

Electronics

Ltd.

CONTENTS

SAFETY

INFORMATION

anal

FRONT/REAR

PANEL

CONTROLS

7

CONTENTS

AND

SPECIFICATIONS

ALIGNMENT

PROCEDURE

PICK-UP

REPLACEMENT

WIRING

DIAGRAM

ADJUSTMENT

POINTS

CIRCUIT

DIAGRAM

P.C.B.

LAYOUT(PARTS

SIDE)

REMOTE

CONTROL

CIRCUIT

MECHANISM

EXPLODED

VIEW

MECHANISM

EXPLODED

PARTS

LIST

ELECTRICAL

PARTS

LIST

EXPLODED

VIEW

PACKING

DIAGRAM

SERVICE

CONTACT

INFORMATION

SPECIFICATIONS

NAD

5420/5425

COMPACT

DISC

PLAYER

Disc

capacity

Programming

capability

Digital-to-Analogue

Convertion

Digital

filter

Analogue

filter

Frequency

response

5

Hz-20

KHz

De-Emphasis

error

THD

(at

O

dB,1

KHz)

Intermodulation

distortion

(19

&

20

KHz)

Dynamic

range

Linearity

Signal-to-noise

ratio

A

weighted

de-emphasis

off

.

de-emphasis

on

Channel

Separation

1

KHz

10

KHz

Wow

and

flutter

Output

iImpendance

Output

level

at

O

dB

Digital

error

correction

PHYSICAL

SPECIFICATION

Width*hightxdepth

Net

weight

Shipping

weight

Single

disc,120

or

80

mm

16

tracks

MASH,

18-bit

resolution.

4

times

over-sampled,

linear

phase

with

18-bit

coefficients

5-pole

active

~0/-0.5

dB

<+0.3

dB

0.0025%

<~100

dB

98

dB

+0.5

dB;

0

to

-90

dB

106

dB

110

dB

>100

dB

»80

dB

Unmeasureable

(quartz

crystal

accuracy)

120

Ohms

2

Vrms

CIRC

with

double

error

correction

in

Ci

and

C2

420*90*260

mm

4.1

Kg

4.9

Kg

er

Fey.

aa

ALIGNMENT

PROCEDURE

REQUIRED

INSTRUMENTS:

SPECIAL

JIG

(SEE

FIG.1)

OSCILLOSCOPE

(BANDWIDTH

GREATER

THAN

40

MHz)

FREQUENCY

COUNTER

TEST

DISK

(SONY

YEDS-7)

NOTE

Exact

adjustment

can

only

be

performed

with

special

factory

jigs

etc.

However

the

following

alignment

procedure

should

produce

a

wel]

aligned

player

assuming

no

fault

conditions

are

present.

It is

suggested

that

the

position

of

the

preset

resistors

setting

is

noted

or

marked

before

any

adjustment

is

attempted

so

that

these

settings

can

be

returned

to,

should

no

improvement

be

noted

after

adjustment.

Please

refer

to

page

12

for

the

physical

location

of

the

adjustment

and

test

points.

Step

A:

)

)

)

)

)

NNN

NN

oR

OM

—

Step

B:

~~

oN

nN

—

(3)

Step

C:

(1)

(2)

PLL

Adjustment

Turn

power

ON

and

press

the

STOP

key.

Short

circuit

P108

(ASSY)

to

P107

(GND)

Connect

the

frequency

counter

to

P106

(CLK)

and

P107

(GND)

Adjust

RV101

for

a

reading

of

4.2318+

0.01MHz.

After

adjustment

is

completed

remove

the

short

circuit

between

P108

and

P1i07.

RF

Adjustment

Load

the

test

disc

and

set

the

unit

into

PLAY

mode.

Connect

the

scope

to

P109

(RF)

and

P107

(GND).

Scope

setting:

Coupling

:

AC

Vertical

sensitivity:

0.2V/div

Horizontal

time

base:

0.5uS/div

Adjust

RV102

so

that

the

3T

component

of

the

waveform

is

maximun

and

the

eye

pattern

is

at

its

best

shape

(see

Fig

2)

EF

Balance

adjustment

Turn

the

power

OFF,

remove

P1i11

and

replace

it

with

the

special

jig

shown

in

Fig

1.

Connect

the

scope

as

shown

Fig

1.

and

switch

the

jig

to

the

“ON”

position.

scope

setting:

Coupling

:

DC.

Vertical

sensitivity:

0O.5V/div.

Horizontal

time

base:

2

mS/div.

Load

the

test

disc

and

put

the

unit

into

the

PLAY

mode.

Adjust

RV103

so

that

the

tracking

error

waveform

is

symmetrical.

(See

Fig

3)

z

NOTE:

BEFORE

CONTINUING

REFER

TO

PAGE

8

FOR

GUIDANCE

ON

FOCUS

AND

TRACKING

GAIN

ADJUSTMENT.

Focus

gain

adjustment

Switch

the

special

jig

to

“OFF"

and

leave

the

scope

connected.

Scope

settings:

Coupling

-

DC

Vertical

sensitivity:

0.1V/div

Horizontal

timebase

:

2mS/div

Adjust

RV105

so

that

the

DC

level

is

between

120

and

200mv.

Turn

the

power

OFF,remove

the

jig

and

return

the

original

socket

to

Piti.

Tracking

gain

adjustment

Turn

the

power

ON,

load

the

test

disc

and

press

PLAY.

Connect

the

scope

to

pin

3

of

P1111.

Scope

setting:

Coupling

:

DC

Vertical

sensitivity:

O.2v/div

Horizontal

timebase

:

2mS/div

Adjust

RV104

so

that

the

waveform

is

as

shown

in

Fig

4(a).

FiG..

4

"TO

SCOPE

od.

<a

FIG.2(a)

FIG.2(b)

Poor

eye

pattern

ae

4T

5T

-

W1T

/

vee

oF

FIG.2(c)

Good

eye

pattern

ee

ee

ee

ee

ee

ee

ee ee

ee

ee

ee

ee

ee

oe

|

Volt/div:

0.2

V

|

ae

|

Time/div:

2

mS

:

Ar

a

ae

tae

ng

tN

i

y

yee

ne

'

Blain

es

OV

a

Se

way

Per

geal

Y

eu

tau

ae

!

Vk

.

\

FIG.4(b)

High

tracking

gain

(higher

frequency

than

for

low

gain)

2

|

my

nN

HL

,

Volt/div:

0.2

V

Me

a

Time/div:

2

ms

li

iP

iy

.

:

ai,

ue

as

|

mv

@)

V

F

Ly

|

Mt

ih

if

"

\,

mer

(it

\

!

f

i

Nis

ie

MN

nn

FIG.4(c)

Low

tracking

gain

Volt/div:

0.2

V

Time/div:

2

mS

OV

FOCUS/

TRACKING

GAIN

ADJUSTMENT

NOTE:

It is

recommended

that

these

adjustment

are

not

carried

out

unless

absolutely

necessary.

A

frequency

response

analyzer

is

necessary

to

carry

out

this

adjustment

precisely.

However

this

adjustment

has

a

wide

tolerance

so

that

even

if

the

adjustment

has

not

been

performed

exactly

the

player

will

still

work

with

an

acceptable

level

of

performance.

The

focus

and

tracking

gain

determine

not

only

the

vertical

and

horizontal

:

tracking

characteristics,

but

also

the

amount

of

mechanical

noise

from

the

3

optical

blocks

two

axis

device

and

its

sensitivity

to

mechanical

shock.

}

Correct

adjustment

will

be

at

the

point

where

all

the

above

criteria

are

satisfied.

*

When

the

gain

is

too

high,

the

mechanical

noise

is

high.

*x

When

the

gain

is

too

low,the

susceptibility

to

mechanical

shock

and

skipping

will

be

poor.

ere

we

ree

wee

ee

eee

ce

ee

eee

es

ee

ee

ee

eee

ee

ee

ees

ee

ee

eee

eee

ee

eee eee

ee

a

i

en

tl

—

ee

cee

ee

eee

ee

ee ee

ee

ee

ee

ee

eee

eee

ee

ee

ee

ee

ee

eee

es

ee

eee

eee

eee

~~

<a

ee

ee

ee

ee

eee

ee

——

a

oe

oe

oe

eee

ae

ae

ee

Time

taken

from

stop

to

play

is

excessive,

or

track

skip

time

is

excessive.

(normally

approx.

2

sec)

Music

does

not

start

when

play

1s

pressed

or

track

selection

is

made

but

disc

rotates.

—

eee

ee

ee ee ee

ieee

ee

ee

ee

ee

ee ee ee ee ee

eee

ee

ee ee

eee

ce

ees

eee eee

ee

eee

eee

——

a a

ee

eee

ee

eee

eee

ee

ee

—_

a

a

ee

ee

ee

ee

eee

ee

ee

eee

ee

ee

ee ee

eee

eee

eee

eee

eee

eee

eee

eee

ee

eee

eee

—

ere

ote

ee

ee

ae

ee

eee

eee

ee

ieee

ee

oe =r

a

CP

ee

ee

ee

ee

eee

eee

ee

Intermittent

sound

during

play

or

counter.

stops.

High

mechanical

noise

from

optical

block

during

play.

low

or

high

low

or

high

TOW

low

or

high

low

high

high

7

Pee

.

Toe

ghee

Bhi

aa

ci

Nelo

aie

me

att,

oe

sheets

.

a

”

fais

TR

~~

ah

i

i

us

nay

.

ae

res

Es

a

11

PRECAUTIONS

WHEN

CHANGING

LASER

PICK-UP

!!

When

removing

pick-up

assembly,

short

circuit

the

PCB

pattern

as

shown

in

the

drawing

in

order

to

protect

the

pick

up

before

removal.

NOTE:

Replacement

pickup

assemblies

are

supplied

with

the PCB

pattern

already

protected.

DO

NOT

REMOVE

THE

SHORT

CIRCUITS

UNTIL

YOU

HAVE

FINISHED

FITTING

THE

PICKUP.

*PICKUP

REPLACEMENT*

1.

Push

OPEN/CLOSE

button

to

open

the

disc

tray.

2.

Remove

the

tray

door.

3.

Push

OPEN/CLOSE

button

to

close

the

disk

tray.

4.

Disconnect

the

AC

mains

supply.

5.

Remove

the

front

panel

and

mechanism

from

the

chassis.

6.

Before

removing

the

mechanism

note

the

precautions

listed

above.

7.

Remove

screws

ABCD

to

release

the

pickup

assembly.