Akai AA-1010 Manuale utente

SECTION 1

SEFIVICE

MANUAL

TABLE OF

CONTENTS

I.

TECHNICAL DATA

.... .. ........ 2,

II.

DISMANTLING OF UNIT

.. ., ,..... 4

ÍII.

CONTROLS

.......... 5

IV.

PRINCIPAL PÁRTS IOCATIONS

............... 5

V. VÀRACTOR TUNER

AND PRESET TUNING

SYSTEM....

............,.,.

6

l.

VARACTOR TUNER

. .

. . .

.

.............ó

2.

PRESET

TUNING SYSTEM

. . , . ,.-.,..,.,.-,9

VI.

TUNER ADJUSTMENT

............I0

I. FM

SECTION ADJUSTMENT

.

. . .,........I0

2. LW SECTION ADJUSTMENT

. . ,.,.,,..,12

3. MW SECTION

ADJUSTMENT

.

. . ..........I3

VII. MAIN AMP ADJUSTMENT

,... . , . , . , , . , . . . . . . . 14

VIII. TUNING

CORD THREADING

.. . , . , . , . . . . . . . . . . I5

IX. CLASSIFICATION

OF

VARÍOUS

P.C BOARD

.

. . . . .......16

I. RELATION OF P,C BOARD

TITLE AND

IDENT]FICATION

NUMBER . . . , , . , . , . , , , , . , . I ó

2. COMPOSITION

OF

VARIOUS

P.CBOARD ...... _........ _17

FoÍ baÍc

adjusimênrs, ne.suring nerhoG,

6d

operari.g

prin.iptes,

reter to CENEÍ|ÀL OPERÁTING PRINCIPLES AND

ADJUSTMENTS.

I. TECHNICAL

DATA

PoWER AMPLIFIER

SECTION

CONTINUOUS

POWER OUTPUT

2{HÁNNELS DRIVEN

14 Watts

per

chdnel, nininun RMS, at 8 ohms

from 40 to 20,000 Hzwilh

no

more

thm

0-8%

lotal tamonic distoilio..

POWER BANDWIDTH

OHF)

SIGNAL

TO NOISE RATIO

OHF)

RESIDUÀLNOISE

CHÀNNEL SEPÀRATION íHF)

l5 Hz to40

tHzl8 ohns. dislortion withiÍ 0.8%

PHONO

AUX

SPEAKERS

HEADPHONE

PHONO Betler

rhan50 dB at 1,000 Hz

Les rhán 0.8

nV

al

8 onns

More than

30

(l

kHz.8 ohmt

A,

B

(4

to

16 ohmt/Á+B

(8

ro 16 ohm9

PIN: 150 nV/100

k óhns

DIN:

l0 nv/180

k ohms

PIN:150óV/l00kohns

DIN:

150

mv/r00 k ohms

30

Hz lo

15

kgz

ll

dB

l0 Hz lo ?0 kHz

+0

dB, 2

dB

+10

dB at 100 Hz,

+5

dB

at

10 kHz

(Volume

conbol setal

-30d8

position)

INPUT SENSIÏVITY/IMPEDANCE

PHONO

AUX

TAPE MONITOR

DAMPINC FACTOR

ottrPuT

PRE ÁMPLIFIER SECTION

OTITPUT I'EVEL/IMPEDANCE

TONE CONTROL

LOT'DNESS CINTROL

FREQUENCY

RANCE

SENSITIVITY

OHF)

CAPTURE

RATIO

SELECTIVITY

(IHF)

IMÀGE

REJECTION

IF RE.'ECTION

SPURIOUS REJECTION

AM STJPPRESSION

SIGNAL

TO NOISE RATIO

HÁRMONIC

DISTORTION

TT'NING

INDICATOR

STEREO

SEPARATION

SUBCARRIER

SUPPRESSION

ANTENNA INPUT

IMPEDANCE

88

MHz ro

108

MHz

1.5 dB

TAPE REC

FREQT'ENCY

RESPONSE

PIIONO

(RIAA)

TUNER/AUX/'TAPE

MONITOR

BASS

TREBLE

More rhan 5t

dB

(98

MHz)

More than 70

dB

(98

MÈz)

Móre than ?0 dB

(98

MHz)

50

dB

60dB

MONO

STEREO

Le$ thàn 0,3%

i

100%

nodtlation)

Les ihan 0,6%

(1009',

modulÁ1ion)

C€nter Turiq meter

a F

More than 40 dB

(l

tHz)

300 ohns

balanced, ?5 ohms unbabnced

FM TUNER SECTTON

AM TUNER

SECTION

FREQUENCY RANGE

SENSITIVITY

(IHF)

SELECTIVITY

OHF)

SICNAL TO NOISE RATIO

IMAGE REJECTION

IF REJECTION

SEMI{ONDUCTORS

POWER

REQUIRDMENTS

DIMENSIONS

520 kHz

10 1,605 kgz

150 kHz

to 350 kHz'

200

Àrv/n

(tEr

anl€nna) 20liv

(ext.

antêntu)

300

lrv/h

(bar

antenna)

30llv

{ext.

antÈnM)

MW: More

than 30 dB

LW: More

than 30 tlB

More than

55 dB

(l

MHz)

More tho

35 dB

(240

ktlz)

MW:

Moie than 45 dB,

Lwr

More thd 50dB

TÍaÍníors:

27, Diodes: 25, FET!:

2,

CSÁ, ULa.d

LA hodelsr l20V,60Hz

CEE nodeh: 220V, 50 Hz

Olher nodels: 110/220l240V,

50/60 Hz swilchable

440(w) x

l2s(H) x 26s(D)nm

(17.3

x 4.9 x

r0.4")

WETGHT

6.2

ke

(l

I

T

lbt

'

Forimprovem€nl purposes,

specilications and d€sisn are

snbj.ct tóchanse{nhost nolic€,

DISMANTLING OF

UNIT

In case of

lrouble, e1c. necessilaring disassembly.

pleáse

disassemble

in the order show.

in pholos.aphs. Reassemble

scREws

..

-: .

|

======

al

=ilÊEEë l

a

iË.-iÊE=E

.-.-.al

"t

III.

CONTROLS

-n

r=

FIl

VOLI]ME

IV. PRINCIPAL

PARTS

LOCATION

Fis. 1 Controls

[.lr "t4

.-l

f.

r--Eï

lÊ.' I

l9g!)

**.""

E

nn

6U

Fig.2

Top View

V,R PC

EOARD

aÁ-5t57

IC FC EOARD

AÁ-5r56

TOUC|I

SW|ÍCH

PC BOARo ÁA-5r58

Fig.6 Block Dias.am

t:

L

t--

3) Acrual

Operation

Fig. 5 is a cÍcuit diagram of the high

fr€qu€ncy

amplifier stase only

of a circuit which is actually

used. Condenser

Cl and varactor diode Dl in

the diagram are equivalent to the variable

con,

denser of

an

ordinary

FM fÍont end. As can be

understood

from Fig. 3, Dl varies the capacitance

in a 4 to 16 PF ranSe

by means oí inverse bias

voltage.

This capacitance and condenser

Cl

combined caFcitance forÍns the Íesonance

circuit

with coil LA. Consequently, it is satisfactory

if

at

low.esonance

íÍ€quency, the voltage

supplied

to the varactoÍ diode d€clines,

and at hid re-

sonanc€ frequency, the voltage

supplied to th€

varactor

diod€ increas€s.

This

voltage

variation

method with variabl€ resistor, êtc.,

op€rates

in

the

sam€ way as a regulaÍ variable

cordenser.

FiE.7

This

method uses a local

oscillator circuit

and

frequency mixer

circuit, and

bias voltage is

applied

to the varactor diode

for starioo

selection and is

called a

varactor

tuneÍ. Pleas€ r€fer

to the scheÍ,a-

tic diagran

foi

actuai

circuit drawing.

II

V

\/. \'ARACTOR

TUNER

AND PRESET TUNING SYSTEM

I. VARACTOR

TUNER

A

varactor tuner is th€ luner system

in

which

varáctor

diode

junction

capacitance is varied by means of the

inverse bias value applied to the

diode for station

selection.

By employing a varactor

diode.

tuning

which is same a! ordinary vaÍiable condenseÍ s),stem

cán bê mad€

without using a variable condenser by

changing control

voltage only.

l)

Features

a)

When used in an FM tuner, th€

front

end can

be

made small€r than \{hen compaÍed with a

variable condenser.

b) Station

selector butaon

positioning

is not

limited.

c) Slation sel€ction by remote control is possible.

d) Ideal voltage can be set for a certain reception

frequency beforehand, and preset

tuning can

b€

efect€d by successively

switching

the

e) If control voltsg€ sweep is at ideal speed,

automatic tuning (seàÍch tuning) is

posible-

0

Pow€r consumption

is about

the

same

as

a

variable condenseÍ system.

ï

f,

g

q

Fig. 3

Fig. 4

Tuning circuit employing a vaÍactor diode

Fig. 5 Example ofHigh Frequency

Amplifier Stage

Cncuit

+

INVERSE VOLTÀCE

2)

VaÍactor

Diode

Characteristics

As foÍ varactor

diode characteristics,

as

shown

in Frg. 3, cápacitance c

r(

changed by chm8e

in

inverse voltage

VR. Further,

ifthis varactor

diode

is used

jn

a tuning circuit,

the

following conditions

Cmax

+

CD

Cmin

+

CD

Cmai, Cmin

arc th€

maximum and

minimum

values of varactor

diode

capacitánce

change.

CD

is the

sum of stray

capacitance

and trinmer

capacitance.

K is over

l_5

b€cause FM broadcast

frequency

range is 88

to t08

MHa Fig.s 4(a)

and

4(b) show the

actual usage

method.

I

iti!È!

ruMre

\.

tti i

'iil

tI

tri

Fig. 8

lcr

lJPclo09c

TERMTNAL@@@@

TO VÀRIABLE CAPACITOR

Fig.

9

2. PRESET

TUNING

SYSTEM

l) Preset

Station

Selecrion

For preset

íatio.

selection,

there is a

mechanical

and an eleclrical

merhod.

These

are memory

equipme.t

and seiection

equipment

enabling

desÍed station

s€lection

beforehand

and selecting

thes€ pre-set

srations

by simply

d€pressing

the

respective

switches.

An ordinary

car redio,

etc. utilizes

a mechanical

station selection

system

wherein

mechanical

variation

is by

mea.s

of

a variable

condenser or

posilioning

ofa

dust corc inside

a coil.

Model

AA,1010L utilizes

an

electrical srálion

selection

system and

employs

the

varacror

tuner

explained in

a

2) An example

of a stllion

selection

system employ"

ing

a

varactor

tuner is

shown in Fig.

6. For skrion

selection, push

switches

are used for

s€lecuon

of voltage supply

to

the varactor

tun€r. However,

in

the

AA.10I0L, these station selection push

switches

are

puÍe

electronic system sensi.touch

3)

Sensi-touch

Employed

Preset Station

Selection

System Operation

The

circult shown

in

Fig.

7 is th€

conlrol voltage

genêratinS

pres€l

volume

and sensi-touch

circuir.

Fig. 8

sho'rrs the inside

of circuit sensi-touch

IC

FPCI009C

which

include the 4 channel

circuitry.

Terminals 14 thÍou8h 17

are the input teminals;

.erminals

@, @,

@,-a

@

arêthestation

selection output

terminals; and

terminals

O ,

@

,

@

,

and

O

are rhe pilot

outpul terminals.

When

channêl I sensor

electrode is louched,

voltage

is snpplied to

the IC as rhe input signal

through

fmger (body)

resistance at t€rminal

@

.

Then,

the impedance

is lowered

at IC station

selector output

terminal

@

and

current flows

ai

shown

by

the

arrow marks in Fig.

9. Consequ-

enlly, because

the supply voltage

10 the varactor

runer

diode is changed

by the dividing ratio

of

Rb and Rc, station selection

is

possible

by

m€ans

of setting the

pr€set

volumes

beforehand

accoÍdrng

to the deriÍed broadcarl

tÍequen.res.

t

VI-

TUNER ADJUSTMENT

IIIJLTI FUNCTIOI{ PC BOARD AA-5I59À

"@

@

ËE

@aD

o

@.

o.

FM IUNING METER ÀOJ

(LO*ER

CORE)

FM OISTORTION

ÁDJ

(I]PPEN

CONEI

aà.

o;

K-l

t:J

rkHÍr I E

i"t

rca

@.

@"TP

.o

FREOUENCY ÀOJ

i:ió'"

Á0

€Íol

H:

tr

ó",,1"R?".1-,

7{A^

\<9r

p"@.@

"op

@

@ @*@oo

ro rà aà(à

@o@

(s)

àE

È 5 .À,.À.n

aË

Fic.

l0 Multi Function P.C Board AÀ-51594

1. FM SECTION ADJUSTMENT

(RefeÍ

to Fig.

l0)

IF

Coil

IF Cóil

Tune oÍly noise withour

inlerfereÍce of hroadcasls.

2

3

108 MHz,ó0 dB

(mono)

input,

Lers than 0.3% distoition

t0

I f Tunins M€ler iÍdicalion

is nol al

@ler

posilion,

rep€tl íeps 2

a.d 3

above.

108 MHz,60 dB(moÍo) input.

EÍor: within

!250

kgz.

108 MHz, L6s than l2 dB

vR3,5 tB

88 MHz,

ó0

dB

(nono)

inpul.

Eror:

WÍhin

1250

kHz.

8

88 Mttz, Les ihan 12dB

9

98 MHz. Less than 12 dB

EÍor: Within

1250

kHz.

l0

vRl,I

kB

19.00 kHz

Connect Frequency Counter

ll

98 MHz.60 dB

Gt€reó)

input.

When ihe Í€r€o i.dicator

ràils

to light, this mans

thal

broadcast n nol beins

Íeceiv€d

t2

vR2, I

kB

40 dB

98 MHz,60 dB

G1€r€o)

l€ft

channel

inpul. Distortion

Faclor

ruí be less than

0.6%.

tl

40 dB

98 MHz,60

dB

Glereo)

Distortion

factor

musl

be

NOTE

I.

NOTE

2.

NOTE

3.

Chart I

ln the event that

the distortion facrors in

Steps 8 and 9 are not tess

than 3%, re-adjust FroÍt

End TrimÍn€.

Condensers

TCR.nd TCA to obtain a

miniÍnum average dislortion

factor at 88,98, and

108 MHz

(san€

distortion factor at all

thÍee

Doints).

PLL IC Free Running

Frequenry Ínust be an exact

19.00 kHz.

Ifthe distortion factor

is not less than

0.ó%, tuÍn IF Coil in

Step I wjthin 1/2 turn rnd adjusr.

VII-

MAIN AMP

ADJUSTMENT

i-*i i-*i

'ÍxI'

'[[r

o

.@

.(a

7

Á@

.@

"@

-CF+

:C.o3 @

mQ

€

?l I

"ll

pp

/z=\

n.=

_

En!

*

((

","

))

=*H@

v

m

P{JSH swrrcH Pr soaRD aÀ-5l55

@. Ul

Fig. 12 Main

Anp P.C BoaÍd AA'5106

ldling Cuíent

Adjultment

(RefeÍ

to Fig. l2)

l Remove

Power Fuses

F2 2A

(left

channel)

and F3

2A

Gight

channel) and

connect an aÍuneter

to

2. At

non.signal input,

adj$t

Senifixed

Resiston

VR4 3008

o€ft

channel) aíd

VR4b 3008

(Íieht

channel) to

obtain a 20 mA idling

cuÍÍent.

VIII.

TUNING

GORD

THRTADING

!Es

XE;

:EE

F

€

ë

t

g

z

15

I

IX. CLASSIFICATION

OF

VARIOUS P.C BOARD

I.

RELATION

OF

P.C

BOARD TITLE AND

IDENTIFICATION NUMBER

P.C

Board Number

ofP.C

Board

MFC P.C Board À4.5159À

Main Amp

P.C

Board AA-5106

Touch Switch

P.C

Board AA 5158

Volume P.C

Board AA-5157

IC P.C

Board

AÁ.5156

Push Switch P.C BoaÍd AA-5155

LED P.C Board AA-5159C

Chart 4

2. COMPOSITION

OF

VARIOUS

P.C

BOARD

I) MFC

P.C BOARD

AA.5I59A

&

JUMPER

P.C BOARD

AA.5'59B

."

.'"

t-

^"

r

1.1o.)

t

-r,_-

!Á so&O

j!

É

-l

ct

i

+e*.sïi6i:ï

^

*!_1o-

M

5É?(9-

-

rtr"-.r-,,oï

I

Ln-

6).

ÀÁ

-

5,6r

4,

G).

:

or

@

Fnn

2) ItÀrN

AMPP.C EOARD

AAslOó

@09e@9

I

3i TOUCH SWITCH

P,C BOARD

AA.5I58

,1)

VOLUME P.C

BOARD

AA-5t57

5) IC P.C BOARD

AA.5156

aa-5158

an-s

os@

METER{+)

I

ESET

ÍUN ING

l^^.,,"

l

@

o

@

na

srss

@

;

o@@@

ÁEfrqB

@áÍáá

ÁÀ-5158

o@@e@@

qqqq'rq

l9

ó)

PUSH SWITCH P,C BOARD

AA-5I55 & LED

P,C BOARD AA-5T59C

9P

d

I

Áa-to6Á

t-, t-f t7

\l

aa-srosn@

Ë

urr

ItopE I

o@9@@@o@oo

U

E

EI

)o

,l

t,

lt

t.'::

()rJo'Is

(s6sls-rív)

oxvo{ J d uadnnf)

I€:"

t"

t€"

" "

xJo]s

(v6tÍs-w)

cuvos J d NotIJNru tfiru{

.G":"'''''

' 'Jsn

sf,uvd auvds

g:IqNennoJÍru

,.ó1II{!IJ.I{O)

dO

gltrVI

I

IEil'r SItlVGl

z t{olrtas

-

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