Akai AA-1010 User manual

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
OF
VARÍOUS
P.CBOARD
.
.
.
.
.... .......16
I. RELATIONOFP,CBOARD
TITLEAND
IDENT]FICATION
NUMBER. . . , , . , . , . , , , , . , .Ió
2. COMPOSITION
OF
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
more
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,
+5
dB
at
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
88
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)
50
dB
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!:
2,
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
ke
(l
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
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 TopView

V,RPC EOARD
aÁ-5t57
IC FC EOARD
AÁ-5r56
TOUC|I
SW|ÍCH
PCBOARoÁA-5r58
Fig.6 BlockDias.am
t:
L
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.
II
V

\/. \'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.
ï
f,
g
q
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
in
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.
I

iti!È! ruMre
\. tti i
'iil tI
tri
Fig.8
lcr lJPclo09c
TERMTNAL@@@@
TO VÀRIABLECAPACITOR
Fig.
9

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 previous
item.
2) An example
of astllion selection
systememploy"
ing
a
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
IC
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
by
m€ans
of settingthe pr€set volumes
beforehand
accoÍdrng
to thederiÍedbroadcarl
tÍequen.res.

t
VI- TUNER ADJUSTMENT
IIIJLTIFUNCTIOI{PC BOARDAA-5I59À
"@
@
@
ËE
@aD
o
@. @.
o.
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
H:
tr
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.
2
3108MHz,ó0 dB(mono)
input,
Lersthan0.3%distoition
t0

If TuninsM€leriÍdicalion
is nol al @ler posilion,
rep€tlíeps 2a.d 3 above.
108MHz,60 dB(moÍo) input.
EÍor: within !250 kgz.
108MHz,L6s thanl2 dB
vR3,5tB 88MHz,
ó0dB (nono) inpul.
Eror: WÍhin 1250 kHz.
888Mttz, Les ihan 12dB
9
98MHz.Lessthan12dB
EÍor: Within
1250
kHz.
l0
vRl,I kB
19.00kHz ConnectFrequencyCounter
ll
98MHz.60 dB Gt€reó)
input.
WheniheÍ€r€o i.dicator
ràils
to light,thismans thal
broadcastn nol beins
Íeceiv€d
t2 vR2,I kB
40dB
98 MHz,60 dB G1€r€o) l€ft
channel
inpul. Distortion
Faclor
ruí belessthan
0.6%.
tl 40dB
98MHz,60 dB Glereo)
Distortion
factor
musl
be
NOTE
I.
NOTE
2.
NOTE
3.
Chart I
ln theeventthat
thedistortionfacrorsin Steps8and9arenottess
than3%,re-adjustFroÍt EndTrimÍn€.
Condensers
TCR.nd TCAto obtainaminiÍnumaveragedislortion
factorat88,98,and108MHz (san€
distortionfactoratall
thÍee
Doints).
PLLICFreeRunning
FrequenryÍnustbeanexact
19.00kHz.
Ifthe distortionfactor
isnotlessthan
0.ó%,tuÍnIFCoilinStepI wjthin1/2turnrndadjusr.

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@
vm
P{JSHswrrcHPr soaRDaÀ-5l55
@. Ul
Fig.12 Main
Anp P.CBoaÍdAA'5106
ldlingCuíentAdjultment
(RefeÍ
toFig.l2)
l Remove
PowerFuses
F22A(left channel)
andF3
2A Gight channel)and connect an aÍuneter to
2. At non.signalinput,adj$t Senifixed Resiston
VR4 3008 o€ft channel)aíd VR4b 3008 (Íieht
channel)toobtaina20mAidling
cuÍÍent.

VIII. TUNING GORD THRTADING
!Es
XE;
:EE
F
€
ë
t
g
z
15

IIX. CLASSIFICATION OF VARIOUS P.C BOARD
I. RELATION OF P.C BOARD TITLE AND IDENTIFICATION NUMBER
P.C
Board Number
ofP.C
Board
MFCP.CBoard À4.5159À
MainAmp
P.C
Board AA-5106
TouchSwitch
P.C
Board AA5158
VolumeP.C
Board AA-5157
ICP.C
Board AÁ.5156
PushSwitchP.CBoaÍd AA-5155
LEDP.CBoard AA-5159C
Chart4

2. COMPOSITION
OF VARIOUS P.CBOARD
I) MFC
P.CBOARD
AA.5I59A
&JUMPER
P.CBOARD
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
-
5,6r4,
G).
:
or
@@Fnn

2) ItÀrN
AMPP.CEOARD
AAslOó
@09e@9
I
I
3i TOUCHSWITCH
P,CBOARD
AA.5I58

,1) VOLUMEP.C
BOARD
AA-5t57
5) ICP.CBOARD
AA.5156
aa-5158
an-s
os@
METER{+)
I
ESET
ÍUNING
l^^.,,"
l
@
@
@
o
@
@
na
srss
@
; o@@@
ÁEfrqB
@áÍáá ÁÀ-5158
o@@e@@
qqqq'rq
l9

ó) PUSHSWITCHP,CBOARD
AA-5I55& LED
P,CBOARDAA-5T59C
9P
d I Áa-to6Á
t-, t-f t7 \l
aa-srosn@
Ë
urr
ItopEI
o@9@@@o@oo
U
EEEI
)o

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