NAD 3020B Manuel utilisateur

SERVICE

MANUAL

BS

aes

i

os

CONTENTS

3020B

AND

3120

REAR

PANEL

CONNECTIONS

SPECIFICATION

INSIDE

VIEW

&

BLOCK

DIAGRAM

ALIGNMENT

3020B

PCB

PARTS

LOCATION

AND

WIRING

DIAGRAM

3020B

SCHEMATIC

DIAGRAM

3120

PCB

PARTS

LOCATION

AND

WIRING

DIAGRAM

3120

SCHEMATIC

DIAGRAM

3020B

EXPLODED

VIEW

3020B

PARTS

LIST

3120

PARTS

LIST

PACKING

DIAGRAM

3120

EXPLODED

VIEW

PAGE

_

PAGE

ao

oO

WwW

9-10

11-12

13-14

15-16

17-18

19-22

23-29

30

31-32

3020B

AND

3120

REAR

PANEL

CONNECTIONS

ENGLISH

Ground

Phono

MM/MC

Phono

Selector

Tuner

Aux

.

Tape

Play/Record

PR

a

eN

GROUND

1

3

'.

Pre-Amp

Out.

Normal

in,

Lab

In

.

Speakers

).

Soft

Clipping

.

AC

Convenience

Outlets

.

impedence

2S3enn

|

eo

heme

PHONO

TUNER

AUX

_6—o—o—.

PLAY

2

4

5

FRANCAS

1,

Mosse

8.

Bornes

pour

haut-perlours

2.

Entree

phono

8.

Ecretage

on

doucour

3.

Selectour

Bobins

mobile/Aimant

mobile

10.

Prises

de

courant

CA

4,

Entree

tuner

11.

Impedance

5.

Entree

aux

6.

Entrees/Sorties-Magnetophone-

7.

Sortie

preampli,

entree

ampli

de

puissance

-

normeal-

entree

empli

de

puissance

-

labo-

SWITCHED

100W

MAX

UNSWITCHED:

150W

MAX

NORMAL

PRE-AMP

LAB

SOFT

PLAY/REC

REC

4N

CLIPPING

3020B

FRONT

PANEL

CONTROLS

.

Treble

.

Balance

}

Aux/Tuner/Phono

=

Somn

Stereo

Amplifier

30208

PHONES

3

TREBLE

TUNER

3120

FRONT

PANEL

CONTROLS

Stereo

Amplifier

3120

PHONES

TUNER

DEUTSCH

Erde

.

Plattenspioler-Eingang

.

MM/MC-Schaiter

.

Rundfunkeingang

.

Zusatzeingang

.

Tonband-Wiedorgabe/Aufnahme

PO

PONs

BNIHIGH!

40(NORMAL}

IMPEDANCE

SPEAKERS

FRANCAIS

DEUTSCH

Tape

1.

Alimentation

7,

Magnetophone

1,

Netz

z

Mono

2.

Casque

decoute

8,

Mono

2.

Kopthorereusgeng

8.

.

Loudness

3.

Graves

8.

Compensateur

physiotogique

3.

Bafregier

9.

Volume

4.

Agus

10.

Volume/Equilibrage

4,

Hohenregier

10,

.

LED

Power

Meter

5,

Balance

entre

canaux

11,

indiceteur

de

puissance

par

diodes

photoluminescentes

5.

Balanceregier

nv

6.

Aux

Tuner/Phono

6.

Zusatzgerat,

Radio,

Platrenspieier

PHONO

TAPE

PHONO

TAPE

MON:

}.

_Monoschsiter

.

Gehorichtige

Lautstarkenregelung

MONO

Vorverstarker-Ausgang,

Normal-Eingang,

Labor-Eingang

.

Lautsprecheranschlup

.

Leutsprecherimpedenzschaiter

.

Notzkabet

»

Impedance

=Bopn

NAD

crcconeces

voraswem

MOdEL

seuumeR

3120

POWER

RATING

150W

ac

N20V

Gory

Ne

i

A

a

RISQUE

DE

CHOC

ELECTRIQUE:

NE

PAS

OUVRIR

CAUTION:

TO

REDUCE

THE

RISK

OR

ELECTRIC

SHOCK,

DO

NOT

REMOVE

COVER

(OR

BACK),

NO

USER-SEAVICEABLE

PARTS

INSIDE.

REFER

SERVICING

TO

QUALIFIED

SERVICE

PERSONNEL

Tonbendschaiter

,

Leutsterke

.

LED.

tungsanzeige

POWER

(W/8n)

5

1

20

eee

36

1

e

VOLUME

LOUDNESS

VOLME

L-~+

(O

~=LOUDNESS

SPECIFICATIONS

POWER

AMPLIFIER

SECTION

Continuous

average

power

output

at

8

ohms

(minimum

RMS

power

per

channel,

both

channels

driven,

with

no

more

than

the

rated

distortion)

Rated

distortion

(THD)

20Hz—20

KHz

Dynamic

Headraam:

at

8

ohms

Dynamic

power

(maximum

short-term

power

Per

channel)

8

ohms

4

ohms

2

ohms

T.H.D

and

SMPTE

I.M,

distortion

from

250

mW

to

rated

output

IHF

I.M.

(CCIF

IM)

and

T.1.M.

distortion

at

rated

output

Input

impedance

NORMAL

input

LAB

input

Input

sensitivity

for

1

Watt/25

Watts

out

Frequency

Response,

LAB

Input

Audio

bandpass

filtering,

NORMAL

input

PREAMPLIFIER

SECTION

Phono

input

Input

impedance

Input

Sensitivity

(1

KHz)

for

1

Watt/

25

Watts

out

Signal-to-Noise

Ratio

with

cartridge

connected,

A-

weighted

Input

Overload

RIAA

Accuracy

HIGH-LEVEL

INPUTS

(TUNER,

AUX,

TAPE)

Input

Impedance

Input

Sensitivity

for

1

W/25

Watts

out

Signal-to-Noise

ratio,

A-weighted

Input

Overload

Frequency

Response

PHYSICAL

SPECIFICATIONS

Height

Width

Depth

Net

Weight

Shipping

Weight

Power

Consumption

25

W

(14

dBW)

0.02%

+3.0

dB

50W

55

W

70

W

<

0.02%

<0,02%

11.Kohm

22

Kohm

200

mV/1.0V

10

Hz—70

KHz

—3

dB

at

15

Hz

and

35

KHz,

12

dB/octave

47

Kohm,

100

pF

MM

0.55

mV/2.7

mV

MC

35

uV/180

nV

MM

75

dB

re5mvV

MC

73

dB

re

0.5

mV

MM

250

mV

MC

18

mV

+0.5

dB

20

kohm,

220

pF

35

mV/180

mV

90

dB

re

1

W

out

104

dB

re

25

W

out

>25V

20Hz—20KHz

+

0.5

dB

9.6

cm

(3.8

in)

42

cm

(16.5

in)

24

cm

(9.5

in)

5.26

Kg

(11.6

Ibs.)

6.7Kg

(14.7

Ibs.)

50—60

Hz,

110—120

VAC

60

Hz,

220

VAC

50

Hz,

240

VAC

150

VA

INSIDE

VIEW

(4) (3)

PHONE

SW

PHONES

4

o—

FILTER

PHONO

©)

)

0

4

ow

a

_|

@

Ae

2°

2

TUNER

ay

2

ay

Ak

x

HEADPHONE

r

Ptay

©

TAPE

SPEAKER

DIN

JACK

TERMINAL

LEVEL

INDICATOR

MONO

2

mm Oo

BALANCE

q

HEADPHONE

PLay

©

|

TUNER

eer

>

6

|

ee

ALIGNMENT

R653

RX1

VR6

RX2

ALIGNMENT

INSTRUCTIONS

GENERAL:

When

servicing,

in

addition

to

checking

output

power,

THD

etc.,

the

power

output

stages

IDLING

CURRENT

and

DC

OFFSET

should

also

be

checked.

if

ANY

WORK

has

been

performed

on

the

output

section,

checking

and

adjusting

of

IDLING

CURRENT

and

DC

OFFSET

must

be

done.

A.

IDLING

CURRENT:

Checking:

1.

Set

Volumecontrol

to

minimum,

disconnect

any

output

loads.

2.

Locate

and

remove

soldershorts

across

sensing

resistors-R

653

(left)

and

R

654

(right).

3.

Connect

DMM

or

VOM

(with

sensitivity

better

than

100

mV

full

scale)

across

R

653

and

R

654.

4.

Turn

on

and

read

voltage.

Reading

should

be

5

—

20mV,

typically

it

would

be

around

12

mV.

1F

NOT

WITHIN

TOLERANCES

GO

TO

ADJUSTING:

10.

11.

12.

If

within

turn-on

tolerances,

allow

unit

to

warm

up

for

5

minutes.

The

voltage

should

then

be

30

mV,

tolerances

+

10mV.

IF

NOT

WITHIN

TOLERANCES

GO

TO

ADJUSTING:

If

OK,

reconnect

the

soldershorts

across

R

653

and

R

654.

Adjusting:

Turn

off,

remove

bias

adjusting

resistors

RX

1

(left)

and

RX

2

(right)

and

temporary

replace

with

variable

resistors

2

Kohms

to

5

Kohms,

set

the

variable

resistors

to

maximum

resistance.

Turn

on

and

read

voltage

acress

R

653

and

R

654.

It

should

be

less

than

10

mV.

If

too

high,

turn

off

unit

immediately

and

check

the

output

amplifier

section,

especially

Q609-0611-

0613-0615-0617

left

channel

or

Q610-0612-0614-0616-0618

right

channel.

If

voltage

is

OK

upon

turn-on,

adjust

variable

resistors

to

read

approximately

12

mV

on

VOM.

Leave

unit

on

for

5

minutes

and

reset

voltage

to

30

mV.

Note

that

it

takes

a

little

time

for

readings

to

stabilize.

Turn

off

and

remove

variable

resistors

and

replace

with

fixed

resistance

with

exatly

the

same

measured

value.

Use

resistors

in

series

or

paralell

if

necessary.

Recheck

idling

current,

Reinstall

soldershorts

across

R

653

and

R

654.

ALIGNMENT

INSTRUCTIONS

(continued)

Notes:

1.

Failure

to

re-install

soldershort

across

R653

and

R

654

will

result

in

failure

at

high

volume.

2.

Decreasing

value

of

RX

1

and

RX

2

will

cause

idling

current

to

increase.

3.

Too

little

idling

current

will

cause

‘“Crossouer”

distortion.

Too

much

idling

current

will

result

in

overheating.

B

DC

OFFSET:

:

1.

Set

Volumecontrol

to

minimum,

disconnect

any

outputloads.

2.

Connect

DMM

or

VOM

across

each

channel’s

speaker

terminals.

eres

3.

Turn

on

and

read

VOM.

Reading

should

be

0

V.DC.

Tolerance

+

50mV.

Adjust

VR

5

(left)

or

VR

6

(right)

as

necessary.

Notes:

1.

Before

adjusting

VR

5

or

VR

6

soften

the

lock

paint

with

laquer

thinner

to

avoid

destroying

them.

Secure

with

lock

paint

(nail

polish)

when

adjustment

is

completed.

2.

Incorrect

adjustment

of

DC

offset

can

create

pop

when

inserting/removing

Headphone

plug.

3.

Offset

more

than

3

V

is

caused

by

defective

parts,

not

by

misadjustments.

3020B

PCB

PARTS

LOCATION

AND

WIRING

DIAGRAM

240V

/50Hz

FOR

VERSION

B.

BL

220V/50Hz

FOR

VERSION

CCl

TIA/250V

\se

re

_.

at.

r656

5

@JHe

eet

220V

/50Hz

FOR

VERSION

C2

lj

:

eon

RE

120V/60Hz

FOR

VERSION

A,A1.C3

g

Sy

@

ness

|

~

C63

633

at

\

Ge

;

a

Soe

7

5

Io

Si

=

mm

R65

EE

LEE

SS

Se

Sri

CLE

SSUASS

se?

=;

—~g—

—

10—-—

3020B

SCHEMATIC

DIAGRAM

NOTES!

1

ALL

RESISTORS

ARE

1/6W!5%%

CARBON

UNLESS

OTHERWISE

SPECIFIED.

2

ALL

DIODES

ARE

BAW62

UNLESS

OTHERWISE

SPECIFIED.

3

CAPACITANCE

ARE

IN

uF

UNLESS

OTHERWISE

SPECIFIED.

4

MEANS

RESISTOR

WITH

CERAMIC

TUBE

STAND

UPON

THE

P.CB.

S

CIIMEANS

MOUNT

ON

COMMON

HEAT

SINK.

6

XX

MEANS

R653

R654

WILL

BE

SHORTED

AFTER

IDLE

CURRENT

ALIGNMENT.

7

THE

VOLTAGE

SHOWN

AT

EACH

POINTS

ARE

TESTED

ON

STATIC

CONDITON.

8

ALL

SW

ARE

ATOFF

POSITION.

ChOt

427

gn2

1k

27K

@509

=

PRE

OUT

NOTES

2

NOTE

4:

FUSES

RATING

1

SW-10,bcd:

POWER

SW

2

SW-2a.b

:PHONO

SW,

UL,

CA

SO,FL,OM

32

SW-3a.b

:TUNER

SW.

FOR:

SI,

HK

UK.AS.IL

\

4

SW-La.b

:AUX

SW.

EC,SA.

5

SW-Sa.b

‘TAPE

MONITOR

SW.

F1,F2:

1A/250V

TIA/250V.

!

6

SW-6a.b

:

LOUDNESS

SW.

F3,F4:

T3A/250V

1315A/250V.

i

w

7

SW-7

MONO

\

Z

8

SW-Bab

:SOFT

CLIPPING,

.

|

S

9

SW—9a.b

:

TURBO

SW.

:

\

2

NOTES

3:

\

ts

z

O\

F

-

a

2 0 0

0

16

1

7

ee

.0'

s

5

ee

ECB

Ds

§

Ee

¢

E¢

8

1

ats

'

3

2se669

111

BCS46

2sc2602

9

8

}

of,

280469

Bc549

S58

'

8556

161405

Cea

}

2N3085

Bc5s9

i

FET]

aN

M2955

'

wpa

oe

a

+29,.5V

iS

©

Fy

2

flee

fe

fs]

i)

ok

V

kay

xB)

533

5

af

622

&

7us0V

i

*e—H

$

a:

6

v

-308¢

Pty

a

S33

a90t_2sD66!

ROO

32

SPK

TML

n

>

1

®

Ss

OWHITE

4

OHM

8

OHM

Swia

oot

oe

*

_g

ORANGE

2

Hi

poor

ee

io

a”

@pel

ls

=

iat

a

ES,

2

1MJ2955

Ay

S

;

TET

:

263

S24

=

5

BLAC

9.0047

240V/50Hz

FOR

VERSION

B,B1,

:

8

|

|--4-

286490

|

ao

sy

fh

3

b

sw-9b

RED

18k

|

tK

1K8

1KB

Mg

18K

33

[cssin

i

a

or

ee

ero

tes

oo

V

Fa

P—7

ORAN:

Vv

ITI}

R705-¢-R705}-¢

R7Oal-¢

TO

+

RT

88

[aay

9902

28869.

Y)

ansv

ES

ware

0

FO

—4

Vv

ink

:

FOR:

UK.AS

4

OHM

BOHM

San

2K2

20w

SW

35W_

10W

©

=

jai

—

‘O-

i

or

SW1o.

=

PHONE

JACK

C802

(

120V/60Hz

FOR

VERSION

A

Al,

C3

220V/50Hz

FOR

VERSION

C2

L602

SPK

TML

[6]

=

Site

|

#122

3120

PCB

PARTS

LOCATION

AND

WIRING

DIAGRAM

SPEAKERS

240V/50Hz

FOR

VERSION

8,

BL

220V

/50Hz

FOR

VERSION

C,Cl

TAPE

PLAY/REC

NORMAL

PRE-

ANP

LAB

iN

OUT

GROUND

PHONO

TUNER

AUX

PLAY

REC

IN

AC

A

TIA/250V

Fi

“oo

0

0}

(of

B

TIA/250V

F2

bi

o

oo]

[o

4%

¢

144/250

F3

,

=

1

a0

|

144/250

Fa

?

-

=

0

3

t

.

i

eee

ts

ze

%

aes

R656

66

a

fas

CEN

220V

/50Hz

FOR

VERSION

C2

aS

~

>)

120V/60Hz

FOR

VERSION

A,

Al,C3

\

i=)

R655.

=

LE

et

es

6)

eee

;

Fae

a

|.

—

SWITCH

9

UNWITCHED

el

*

I

=

Q

AON

MDS

aaanaaqa

oN

”

bk

7

(e-s

ARs

aN

vial

cm

=

==

ee

=A

EF

<9

COS

C9

1\

i

9

OE

\

L

|

i

|—4

4

i

VOLUME

cael

1

gt

VR

UJ

U

LOUDNESS

MONO

TAPE

PHONO

TUNER

AUX

—13—-

a4

Aes

NAD 3020B Manuel utilisateur

Manuels Amplificateur populaires d'autres marques