Akai AA-1010 Manuale utente

SECTION 1

SEFIVICE MANUAL

TABLE OF CONTENTS

I. TECHNICALDATA

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

II. DISMANTLINGOFUNIT

.. ., ,..... 4

ÍII. CONTROLS .......... 5

IV. PRINCIPALPÁRTSIOCATIONS ............... 5

V. VÀRACTORTUNER

ANDPRESETTUNING

SYSTEM.... ............,.,. 6

l. VARACTORTUNER

...

. .............ó

2. PRESET

TUNINGSYSTEM

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

VI. TUNERADJUSTMENT ............I0

I. FM

SECTIONADJUSTMENT

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

2. LWSECTIONADJUSTMENT

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

3. MWSECTION

ADJUSTMENT

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

VII. MAINAMPADJUSTMENT

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

VIII. TUNING

CORDTHREADING

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

IX. CLASSIFICATION

VARÍOUS

P.CBOARD

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

I. RELATIONOFP,CBOARD

TITLEAND

IDENT]FICATION

NUMBER. . . , , . , . , . , , , , . , .Ió

2. COMPOSITION

VARIOUS

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

FoÍ baÍc adjusimênrs,ne.suring nerhoG, 6d operari.gprin.iptes,

reter to CENEÍ|ÀL OPERÁTINGPRINCIPLESAND

ADJUSTMENTS.

I. TECHNICAL DATA

PoWERAMPLIFIERSECTION

CONTINUOUS

POWEROUTPUT

2{HÁNNELSDRIVEN 14Watts

per

chdnel, nininun RMS,at 8ohms

from40 to 20,000Hzwilh no

thm 0-8%

lotaltamonic distoilio..

POWERBANDWIDTH

OHF)

SIGNAL

TO NOISERATIO OHF)

RESIDUÀLNOISE

CHÀNNELSEPÀRATIONíHF)

l5 Hzto40 tHzl8 ohns.dislortionwithiÍ 0.8%

PHONO

AUX

SPEAKERS

HEADPHONE

PHONO Betler

rhan50dBat 1,000Hz

Lesrhán0.8

nV al8onns

Morethan

30(l kHz.8 ohmt

A,B(4

to 16ohmt/Á+B

(8ro16ohm9

PIN: 150nV/100 k óhns

DIN: l0 nv/180

kohms

PIN:150óV/l00kohns

DIN: 150

mv/r00kohms

30Hzlo 15kgz ll dB

l0 Hzlo ?0kHz+0

dB, 2dB

+10

dBat100Hz,

10kHz

(Volume

conbolsetal

-30d8 position)

INPUTSENSIÏVITY/IMPEDANCE PHONO

AUX

TAPEMONITOR

DAMPINCFACTOR

ottrPuT

PREÁMPLIFIERSECTION

OTITPUTI'EVEL/IMPEDANCE

TONE CONTROL

LOT'DNESSCINTROL

FREQUENCY

RANCE

SENSITIVITY

OHF)

CAPTURE

RATIO

SELECTIVITY (IHF)

IMÀGE REJECTION

IF RE.'ECTION

SPURIOUSREJECTION

AM STJPPRESSION

SIGNAL

TO NOISERATIO

HÁRMONIC

DISTORTION

TT'NING INDICATOR

STEREO

SEPARATION

SUBCARRIER

SUPPRESSION

ANTENNA INPUT IMPEDANCE

MHzro108

MHz

1.5dB

TAPE REC

FREQT'ENCY

RESPONSE PIIONO

(RIAA)

TUNER/AUX/'TAPE

MONITOR

BASS

TREBLE

Morerhan5t dB (98

MHz)

Morethan70

dB (98

MÈz)

Mórethan?0dB (98

MHz)

60dB

MONO

STEREO Le$ thàn0,3%

i100%

nodtlation)

Les ihan0,6%

(1009',

modulÁ1ion)

C€nterTuriq meter

a F

Morethan40dB(l tHz)

300ohns balanced,?5ohmsunbabnced

FMTUNERSECTTON

AM TUNERSECTION

FREQUENCYRANGE

SENSITIVITY (IHF)

SELECTIVITY

OHF)

SICNALTO NOISERATIO

IMAGEREJECTION

IF REJECTION

SEMI{ONDUCTORS

POWER

REQUIRDMENTS

DIMENSIONS

520kHz

101,605kgz

150kHz

to350kHz'

200

Àrv/n

(tEr

anl€nna)20liv (ext.

antêntu)

300

lrv/h (bar

antenna)

30llv {ext.

antÈnM)

MW: More

than30dB

LW: More

than30tlB

Morethan

55dB(l MHz)

Moretho 35dB(240

ktlz)

MW: Moiethan45dB,

Lwr Morethd 50dB

TÍaÍníors:

27, Diodes:25, FET!:

CSÁ,ULa.d

LAhodelsrl20V,60Hz

CEEnodeh: 220V,50Hz

Olhernodels:110/220l240V,

50/60Hzswilchable

440(w)x l2s(H)x26s(D)nm

(17.3

x4.9x r0.4")

WETGHT 6.2

I T

lbt

' Forimprovem€nlpurposes,

specilicationsandd€sisnare

snbj.cttóchanse{nhost nolic€,

DISMANTLING OF UNIT

In caseof lrouble, e1c.necessilaringdisassembly.

pleáse

disassemble

in theordershow. in pholos.aphs.Reassemble

scREws

-: .

| ====== al

=ilÊEEë l

a iË.-iÊE=E

.-.-.al

III. CONTROLS

-n r= FIl

VOLI]ME

IV. PRINCIPAL PARTS LOCATION

Fis.1 Controls

[.lr "t4

.-l f. r--Eï

lÊ.'I

l9g!)

**.""E

Fig.2 TopView

V,RPC EOARD

aÁ-5t57

IC FC EOARD

AÁ-5r56

TOUC|I

SW|ÍCH

PCBOARoÁA-5r58

Fig.6 BlockDias.am

t--

3) Acrual

Operation

Fig. 5 is a cÍcuit diagramof the highfr€qu€ncy

amplifier staseonly of a circuit which is actually

used. Condenser

Cl and varactordiode Dl in

the diagram are equivalent to the variable con,

denserof an ordinary FM fÍont end. As canbe

understood

from Fig. 3, Dl variesthecapacitance

in a 4 to 16 PF ranSe

by meansoí inversebias

voltage. This capacitanceand condenserCl

combinedcaFcitanceforÍnsthe Íesonance

circuit

with coil LA. Consequently,it is satisfactory

if at low.esonance

íÍ€quency,thevoltage

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 asa regulaÍvariable

cordenser.

FiE.7

This methodusesa local

oscillatorcircuitand

frequencymixer

circuit,and

biasvoltageis

applied

to thevaractordiode

for starioo

selectionandis

calleda

varactor

tuneÍ.Pleas€r€fer

to thescheÍ,a-

ticdiagran

foi actuai

circuitdrawing.

\/. \'ARACTOR TUNER

AND PRESET TUNING SYSTEM

I. VARACTOR TUNER

Avaractortuneristh€lunersystem

inwhich

varáctor

diode

junction

capacitanceisvariedbymeansof the

inversebiasvalueappliedto the diodefor station

selection. By employinga varactor

diode.

tuning

which is samea! ordinaryvaÍiablecondenseÍs),stem

cánbêmad€

withoutusinga variablecondenserby

changingcontrol

voltageonly.

l) Features

a) Whenusedin an FM tuner,th€ front endcan

be madesmall€rthan\{hencompaÍedwith a

variablecondenser.

b) Station selectorbutaonpositioning

is not

limited.

c) Slation sel€ctionby remotecontrol ispossible.

d) Idealvoltagecanbe setfor a certainreception

frequencybeforehand,and presettuning can

b€ efect€d by successively

switching the

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

automatictuning(seàÍchtuning)isposible-

0 Pow€r consumption is about the same as a

variablecondenseÍsystem.

Fig.3

Fig.4 TuningcircuitemployingavaÍactordiode

Fig.5 ExampleofHighFrequency

AmplifierStage

Cncuit

+ INVERSEVOLTÀCE

2) VaÍactor

Diode

Characteristics

As foÍ varactor

diodecharacteristics,

asshown

in Frg.3, cápacitancec r( changedby chm8e

inversevoltage

VR. Further,

ifthis varactor

diode

isused

jnatuningcircuit,

the

followingconditions

Cmax + CD

Cmin + CD

Cmai, Cmin arc th€ maximum and minimum

valuesof varactordiode capacitánce

change. CD

is the sum of stray capacitance

and trinmer

capacitance.

K isover

l_5

b€causeFMbroadcast

frequency

rangeis 88 to t08 MHa Fig.s4(a)

and

4(b) showtheactualusage

method.

iti!È! ruMre

\. tti i

'iil tI

tri

Fig.8

lcr lJPclo09c

TERMTNAL@@@@

TO VÀRIABLECAPACITOR

Fig.

2.PRESET

TUNING SYSTEM

l) Preset

Station

Selecrion

For preset

íatio. selection,

thereisamechanical

and an eleclrical

merhod. These

arememory

equipme.t and seiection

equipment

enabling

desÍedstation

s€lection

beforehand

andselecting

thes€pre-set

srations

by simplyd€pressing

the

respective

switches.

An ordinary

carredio,

etc.utilizes

a mechanical

station selection

systemwherein mechanical

variation

isby mea.s

of a variable

condenseror

posilioning

ofa dustcorcinside

acoil.

Model AA,1010L utilizes

an electricalsrálion

selection

systemand

employs

thevaracror

tuner

explainedina

item.

2) An example

of astllion selection

systememploy"

ing

varactor

tuneris

showninFig.

6. Forskrion

selection,pushswitches

areusedfor s€lecuon

of voltagesupply

to thevaractor

tun€r.However,

in the AA.10I0L, thesestationselectionpush

switches

are puÍe electronicsystemsensi.touch

3) Sensi-touch

Employed

PresetStation

Selection

SystemOperation

Thecircultshown

in Fig.

7 isth€

conlrolvoltage

genêratinS

pres€l

volume

andsensi-touch

circuir.

Fig.8 sho'rrstheinside

of circuitsensi-touch

FPCI009C

which

includethe4 channel

circuitry.

Terminals14thÍou8h17

aretheinputteminals;

.erminals

@, @, @,-a @ arêthestation

selectionoutput terminals;andterminals

O ,

@ , @ ,

andO arerhepilot

outpulterminals.

When channêlI sensor

electrodeis louched,

voltage

is snppliedto the IC asrheinput signal

through

fmger(body)

resistanceatt€rminal

@ .

Then, the impedance

is lowered

at IC station

selectoroutput terminal@ andcurrentflows

ai shown

by the

arrowmarksin Fig.

9. Consequ-

enlly,because

thesupplyvoltage

10thevaractor

runer

diodeis changed

by the dividingratioof

Rb and Rc, stationselection

is possible

m€ans

of settingthe pr€set

volumes

beforehand

accoÍdrng

to thederiÍedbroadcarl

tÍequen.res.

VI- TUNER ADJUSTMENT

IIIJLTIFUNCTIOI{PC BOARDAA-5I59À

ËE

@aD

@. @.

FM IUNING METERÀOJ

(LO*ER CORE)

FM OISTORTION

ÁDJ

(I]PPEN

CONEI aà.

o;K-l

t:J

rkHÍr I E

i"t rca

@. @"TP .o

FREOUENCYÀOJ

i:ió'" Á0 €Íol

ó",,1"R?".1-,

7{A^

\<9r

p"@.@ "op

@@*@oo

roràaà(à

@o@ (s)

àE

È 5 .À,.À.n

aË

Fic.

l0 MultiFunctionP.CBoardAÀ-51594

1. FM SECTIONADJUSTMENT

(RefeÍ

to Fig.l0)

IF Coil IF Cóil TuneoÍly noisewithour

inlerfereÍceof hroadcasls.

3108MHz,ó0 dB(mono)

input,

Lersthan0.3%distoition

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