NAD 3020B Manuel utilisateur

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MANUAL

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Dtt-

30208

AND

3120

REAR

PANEL CONNECTIONS

ENGLISH

Ground

Phono

MM/MC

Phono

Seleetor

Tuner

Aux

7. P.-.-Amp

Oul

Norn'\8t

ln.

Lab In

S-kon

SoftOipp;nt

10. AC Con,.,_Mnce

Outlea

11.1-nc.

FRANCA$

M••

lorMI

pour~

Entr•

p/lono

E-on-.,

SMee10Ur

Bobtne

mobite/

Aiment

mobile 10.

PrM

c:ounM

-4,

Entr•tuMt

11.

l~nce

Entree-.uuii.U.

DEU~H

Erdo

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.e.,..,.

MM/MCScholtw

Aundfunbtntltnl

5. z....

tni~

V--'<•·"""-1.

Honftoi.EI._,t.

Ubor-1:~"9

u..-..oct>lul

l.t.u

___

10.N-

11.1.._,..

TIPI

~•v/RecOf"d

Entr--./Sortie....,W9-toptooo~~e-

T-0-W--/Au,.,.,hmo

Sortiepr•rnpli,

.mrnemplidepu~-normllll-

•mr•

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puill.a.r'la

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,.,.,_

.-TAPE--,

NCl"MAL

PRf-Aw

'LAY/REC

1 3 2 4 5 6

30208

FRONT PANEL CONTROLS

EHGLJSH

"""""

s..

-'·

Trft:JIIe

Salona

AuJIJTul'lft/Phono

•

P'OWER

L....-..

10.

VOiu,..

11.

LED--

!'MONES

FRANCAIS

1. Alirnen1at:ion 7. Mavf'W'tOPhone

decouu

Mono

GI'W'ft

Com.-nat...,,

phySiolovi~•

A9n

10.

Votv'""'/EQU•hbf"e9t

Au•

Tuner/Phono

Steno

Amolrfier

30208

TREBLE

BALANCE

3 4 5

3120

FRONT PANEL CONTROLS

Sc...-.o

Arnphfj,er

3120

• "

POWER-

I'HONES

1 2

7 9

AUX

.11

lntHIGHt

-401NOAMAL)

IMPEDANCE

DEUTSCH

Neu.

2.Kcp-......,.

J.~-

H-...,

Ba&ln<»revftr

Zuut:tt-rat,

R•dto,

PtatteniPief«

TUNER

~HONO

TAI"E

6 7

TUNER

I'HONO

TAI"E

6 7

Ton~n.tur

MortOICtl*tw

Gehorichtige

l.altrblfk.nregetung

10.

LeutstarU

11.

LED·L..;stu-zeogo

MONO

LOUDNESS

8 9

MONO

LOUDNESS

8 9

CAUTION:

REDUCE

THE RISK OR

ELECTRIC

SHOCK,

NOT

REMOVE

COVER

lOA

BACK!.

USER.SERVICEABLE

PARTS INSIOE. REFER

SERVICING TO

QUALIFIED

SERVICE PERSONNEL

VOLUME

·VOLUME

......

••

•

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

(THO)

20Hz-20

KHz

Dynamic Headroom

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

rated

output

IHF

I.M. (CCIF

IM)

and T.I.M.

distortion

rated

output

Input

impedance

NORMAL

input

LAB

input

Input

sensitivity

for

Watt/25

Watts

out

Frequency Response,

LAB

Input

Audio

bandpass

filtering,

NORMAL

input

PREAMPLIFIER

SECTION

Phone

input

Input

impedance

Input

Sensitivity (1 KHz)

for

Watt/

25 Watts

out

Signal-to-Noise Ratio

with

cartridge

connected, A- weighted

Input

Overload

IAA

Accuracy

HIGH-LEVEL

INPUTS

(TUNER,

AUX,

TAPE)

Input

Impedance

Input

Sensitivity

fpr

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

sow

55W

70W

<0.02%

Kohm

200

mV/1.0V

10Hz-70KHz

-3

dB at

15Hz

and

KHz, 12 dB/octave

Kohm,

100

0.55

mV/2.7

pV/180

p.V

MM 75 dB

MC 73 dB

0.5

MM 250

MC 18

± 0.5 dB

kohm,

220

mV/180

1 W

out

104 dB

25 W

out

>25

20Hz-20KHz±

0.5 dB

9.6

(3.8 in)

(16.5 in)

em (9.5 in)

5.26

(11.6 lbs.)

6.7Kg

(14.7 lbs.)

50-60Hz,

110-120

VAC

60Hz,

220

VAC

50 Hz,

240

VAC

150

~·

:·~·.

·..../"..

"Q.J"o-J""o--+--<_......,

PHONO~

TUNER@

AUX

@).__-------......1

Tr:eLAYl~----------~

l...

REC

(~--------------+---.

DIN

JACK

SUPPLY

SECTION

::::E

INSIDE VIEW

BLOCK

DIAGRAM

30208

ONLY

HEADPHONE

_!fl

SPEAKER

~TERMINAL

'·

,,..

.,:_.

. . .

::~

.~:::..

-=-.:.

:!'i·,;

*f.:!'&~·~·...,;tlli:f'.

r: t

?t"tr

!Tet'ti?!'f:

within

turn-on tolerances,

allow

unit

warm

for

5 minutes.

The voltage should then

mV,

tolerances± 10mV.

NOT

WITHIN

TOLERANCES

TO ADJUSTINGI

reconnect the soldershorts

across

R 653 and R 654.

Adjusting:

Turn

off,

remove

bias

adjusting resistors RX 1 (left) and

2 (right) and temporary replace

with

variable resistors 2 Kohms

5 Kohms,

set

the variable resistors

maximum resistance.

Turn

on and read voltage

acress

R 653 and R 654.

should

less

than 10 mV.

too

high,

turn

off

unit

immediately and check the

output

amplifier

section, especially

0609-0611-

0613-0615-0617

left

channel

0610-0612-0614-0616-0618

right

channel.

voltage

0 K upon

tum-on,

adjust variable resistors

read

approximately

on VOM.

Leave

unit

for

5 minutes and reset voltage

mV. Note

that

takes a

little

time

for

readings

stabilize.

10.

Turn

off

and remove variable resistors and replace

with

fixed

resistance

with

exatly the

same

measured value.

Use

resistors in

series

paralell

necessary.

11. Recheck idling current.

12. Reinstall soldershorts

across

R 653 and R 654.

ALIGNMENT

INSTRUCTIONS

(continued)

Notes:

Failure

re-install soldershort

across

R653 and R 654

will

result in failure

high volume.

Decreasing value

RX 1 and RX 2

will

cause

idling current

increase.

Too

little

idling current

will

cause

"Crossouer" distortion.

Too

much

idling

current

will

result

in overheating.

OFFSET:

Set

Volumecontrol

minimum,

disconnect any outputloads.

Connect DMM

VOM across

each

channel's speaker terminals.

Turn

on and read VOM. Reading should

DC.

Tolerance±

50mV.

Adjust

VR 5 {left)

VR 6 (right)

necessary.

Notes:

Before adjusting

6 soften the lock paint

with

laquer

thinner

avoid destroying

them. Secure

with

lock

paint

(nail polish) when adjustment

completed.

Incorrect adjustment

offset

can

create pop when inserting/removing Headphone plug.

3. Offset more than 3 V

caused

defective parts,

not

by misadjustments.

For

Service Manuals

MAURITRON SERVICES

Cherry

'free Road,

Chinnor

Oxfordshlre, OX9

4QY.

Tel

(01844)

351694

Fax(01844)

3~2554

email:- [email protected]

(

',--:.:;

3120

PCB PARTS LOC1

GROUND

PHONO

TUNER

~-TAPE

PLAt/REC

PLAY

R£C

NORNAL

PR£-ANP LAB

OUT

LOUDNESS

f10NO TAPE

PHONO

TUNER

)

ARTS

3120

PCB

~.~.

----

LOCATION AND WIRING DIAGRAM

r-·

'""'f

L l

+ -

~------

iTION AND WIRING DIAGRAM

:----r----r---r==========:::::::-1

rtAI250V

0 0

TIA/250V

0 0

[ 0

240V

150Hz

FOR

VERSION

220V

150Hz

FOR

VERSION

GRY

For

Service Manuals

MAURITRON SERVICES

8 Cherry 'free Road, Chinnor

Oxfordshfre OX9 4

QY.

Tel (01844) 351694 ·

. Fax (01844) 352554

emad:- [email protected]

•

3120

•

(

3120

SCHEMATIC DIAGRAM

rnllH.frl!:I6J-4.miffi,o1ID!lBJ..HL1.ill~~--<

~30.5

(

~33.3)

NOTES

I ALL

RESISTORS

All

DIOOCS

CAPACITANCE

.t.

MEANS

RES

s::::MEANS

MEANS

R65:

7 TtiE

VOLTAGE

ALL

ARE

9 (

)MEANS

TUR

NOTES

SW-1

a.o.c,

SW-2

a.o

SW-3

4 sw- 4

a.o

SW-5

a o

$W-6

a.O

SW-7

sw-s

s·11

-9

a. o

NOTES

a(~~E

80HM l

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