Akai-AA1010-rec-sm维修电路原理图.pdf

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1、SECTION 1SEFIVICE MANUALTABLE OF CONTENTSI . T E C H N I C A L D A T A . . . . . . . . . . . . . . 2 ,II. DISMANTLING OF UNIT . ., ,. 4 I I . C O N T R O L S . . . . . . . . . . 5IV. PRINCIPAL PRTS IOCATIONS . 5V. VRACTOR TUNER AND PRESET TUNING SYSTEM. .,.,. 6l . V A R A C T O R T U N E R . . . . .

2、 . . . . . . . . . . . . . . . . 2 . P R E S E T T U N I N G S Y S T E M . . , . , . - . , . . , . , . - , 9VI. TUNER ADJUSTMENT .I0I . F M S E C T I O N A D J U S T M E N T . . . . , . . . . . . . . I 02. LW SECTION ADJUSTMENT . . ,.,.,.,123. MW SECTION ADJUSTMENT . . . .I3VII. MAIN AMP ADJUSTMENT

3、,. . , . , . , , . , . . . . . . . 14VIII. TUNING CORD THREADING . . , . , . , . . . . . . . . . . I5IX. CLASSIFICATION OF VAROUS P.C BOARD . . . . . . . . .16I. RELATION OF P,C BOARD TITLE AND IDENTFICATION NUMBER . . . , , . , . , . , , , , . , . I 2. COMPOSITION OF VARIOUS P.CBOARD . _. _17Fo bac

4、 adjusimnrs, ne.suring nerhoG, 6d operari.g prin.iptes, reter to CENE|L OPERTING PRINCIPLES ANDADJUSTMENTS.RadioFans.CN 收音机爱 好者资料库I. TECHNICAL DATAPoWER AMPLIFIER SECTIONCONTINUOUS POWER OUTPUT2HNNELS DRIVEN14 Watts per chdnel, nininun RMS, at 8 ohms from 40 to 20,000 Hzwilh nomore thm 0-8% lotal ta

5、monic distoilio.POWER BANDWIDTH OHF)SIGNAL TO NOISE RATIO OHF)RESIDULNOISECHNNEL SEPRATION HF)l5 Hz to40 tHzl8 ohns. dislortion withi 0.8%PHONOAUXSPEAKERSHEADPHONEPHONOBetler rhan50 dB at 1,000 HzLes rhn 0.8 nV al 8 onnsMore than 30 (l kHz.8 ohmtA, B (4 to 16 ohmt/+B (8 ro 16 ohm9PIN: 150 nV/100 k h

6、nsDIN: l0 nv/180 k ohmsPIN:150V/l00kohnsDIN: 150 mv/r00 k ohms30 Hz lo 15 kgz ll dBl0 Hz lo ?0 kHz +0 dB, 2 dB+10 dB at 100 Hz, +5 dB at 10 kHz(Volume conbol setal -30d8 position)INPUT SENSIVITY/IMPEDANCEPHONOAUXTAPE MONITORDAMPINC FACTORottrPuTPRE MPLIFIER SECTIONOTITPUT IEVEL/IMPEDANCETONE CONTROL

7、LOTDNESS CINTROLFREQUENCY RANCESENSITIVITY OHF)CAPTURE RATIOSELECTIVITY (IHF)IMGE REJECTIONIF RE.ECTIONSPURIOUS REJECTIONAM STJPPRESSIONSIGNAL TO NOISE RATIOHRMONIC DISTORTIONTTNING INDICATORSTEREO SEPARATIONSUBCARRIER SUPPRESSIONANTENNA INPUT IMPEDANCE88 MHz ro 108 MHz1.5 dBTAPE RECFREQTENCY RESPON

8、SE PIIONO (RIAA)TUNER/AUX/TAPE MONITORBASSTREBLEMore rhan 5t dB (98 MHz)More than 70 dB (98 Mz)Mre than ?0 dB (98 MHz)50 dB60dBMONOSTEREOLe$ thn 0,3% i 100% nodtlation)Les ihan 0,6% (1009, modul1ion)Cnter Turiq meter a FMore than 40 dB (l tHz)300 ohns balanced, ?5 ohms unbabncedFM TUNER SECTTONRadio

9、Fans.CN 收音机爱 好者资料库AM TUNER SECTIONFREQUENCY RANGESENSITIVITY (IHF)SELECTIVITY OHF)SICNAL TO NOISE RATIOIMAGE REJECTIONIF REJECTIONSEMIONDUCTORSPOWER REQUIRDMENTSDIMENSIONS520 kHz 10 1,605 kgz150 kHz to 350 kHz200 rv/n (tEr anlnna) 20liv (ext. antntu)300 lrv/h (bar antenna) 30llv ext. antnM)MW: More

10、than 30 dBLW: More than 30 tlBMore than 55 dB (l MHz)More tho 35 dB (240 ktlz)MW: Moie than 45 dB,Lwr More thd 50dBTanors: 27, Diodes: 25, FET!: 2,CS, ULa.d LA hodelsr l20V,60HzCEE nodeh: 220V, 50 HzOlher nodels: 110/220l240V, 50/60 Hz swilchable440(w) x l2s(H) x 26s(D)nm (17.3 x 4.9 x r0.4)WETGHT6.

11、2 ke (l I T lbt Forimprovemnl purposes, specilications and dsisn are snbj.ct tchansenhost nolic,RadioFans.CN 收音机爱 好者资料库DISMANTLING OF UNITIn case of lrouble, e1c. necessilaring disassembly. plesedisassemble in the order show. in pholos.aphs. ReassemblescREwsscREws. . - : .| = al= i l E E la i.-iE=E

12、.-.-.altRadioFans.CN 收音机爱 好者资料库III. CONTROLS-n r=FIlVOLIMEIV. PRINCIPAL PARTS LOCATIONFis. 1 Controls.lr t4. - l f .r-El . Il9g!)*. Enn6UFig.2 Top ViewRadioFans.CN 收音机爱 好者资料库V,R PC EOARDa-5t57IC FC EOARDA-5r56TOUC|I SW|CHPC BOARo A-5r58Fig.6 Block Dias.amt :Lt - -3) Acrual OperationFig. 5 is a ccuit

13、 diagram of the high frquncyamplifier stase only of a circuit which is actuallyused. Condenser Cl and varactor diode Dl inthe diagram are equivalent to the variable con,denser of an ordinary FM font end. As can beunderstood from Fig. 3, Dl varies the capacitancein a 4 to 16 PF ranSe by means o inver

14、se biasvoltage. This capacitance and condenser Clcombined caFcitance forns the esonance circuitwith coil LA. Consequently, it is satisfactoryif at low.esonance quency, the voltage suppliedto the varacto diode dclines, and at hid re-sonanc frequency, the voltage supplied to thvaractor diod increass.

15、This voltage variationmethod with variabl resistor, tc., opratesin the sam way as a regula variable cordenser.FiE.7This method uses a local oscillator circuit andfrequency mixer circuit, and bias voltage is appliedto the varactor diode for starioo selection and iscalled a varactor tune. Pleas rfer t

16、o the sche,a-tic diagran foi actuai circuit drawing.I IVRadioFans.CN 收音机爱 好者资料库/. ARACTOR TUNERAND PRESET TUNING SYSTEMI. VARACTOR TUNERA varactor tuner is th luner system in which varctordiode junction capacitance is varied by means of theinverse bias value applied to the diode for stationselection

17、. By employing a varactor diode. tuningwhich is same a! ordinary vaiable condense s),stemcn b mad without using a variable condenser bychanging control voltage only.l) Featuresa) When used in an FM tuner, th front end canbe made smallr than hen compaed with avariable condenser.b) Station selector bu

18、taon positioning is notlimited.c) Slation selction by remote control is possible.d) Ideal voltage can be set for a certain receptionfrequency beforehand, and preset tuning canb efectd by successively switching thee) If control voltsg sweep is at ideal speed,automatic tuning (sech tuning) is posible-

19、0 Powr consumption is about the same as avariable condense system.f,gqFig. 3Fig. 4 Tuning circuit employing a vaactor diodeFig. 5 Example ofHigh FrequencyAmplifier Stage Cncuit+ INVERSE VOLTCE2) Vaactor Diode CharacteristicsAs fo varactor diode characteristics, as shownin Frg. 3, cpacitance c r( cha

20、nged by chm8e ininverse voltage VR. Further, ifthis varactor diodeis used jn a tuning circuit, the following conditionsCmax + CDCmin + CDCmai, Cmin arc th maximum and minimumvalues of varactor diode capacitnce change. CDis the sum of stray capacitance and trinmercapacitance. K is over l_5 bcause FM

21、broadcastfrequency range is 88 to t08 MHa Fig.s 4(a)and 4(b) show the actual usage method.IRadioFans.CN 收音机爱 好者资料库iti! ruMre .tti iiiltItriFig. 8lcr lJPclo09cTERMTNALTO VRIABLE CAPACITORFig. 9RadioFans.CN 收音机爱 好者资料库2. PRESET TUNING SYSTEMl) Preset Station SelecrionFor preset atio. selection, there i

22、s a mechanicaland an eleclrical merhod. These are memoryequipme.t and seiection equipment enablingdesed station slection beforehand and selectingthes pre-set srations by simply dpressing therespective switches.An ordinary car redio, etc. utilizes a mechanicalstation selection system wherein mechanic

23、alvariation is by mea.s of a variable condenser orposilioning ofa dust corc inside a coil.Model AA,1010L utilizes an electrical srlionselection system and employs the varacror tunerexplained in a previous item.2) An example of a stllion selection system employing a varactor tuner is shown in Fig. 6.

24、 For skrionselection, push switches are used for slecuonof voltage supply to the varactor tunr. However,in the AA.10I0L, these station selection pushswitches are pue electronic system sensi.touch3) Sensi-touch Employed Preset Station SelectionSystem OperationThe circult shown in Fig. 7 is th conlrol

25、 voltagegenratinS presl volume and sensi-touch circuir.Fig. 8 shorrs the inside of circuit sensi-touch ICFPCI009C which include the 4 channel circuitry.Terminals 14 thou8h 17 are the input teminals;.erminals , , ,-a arthestationselection output terminals; and terminals O , , , and O are rhe pilot ou

26、tpul terminals.When channl I sensor electrode is louched,voltage is snpplied to the IC as rhe input signalthrough fmger (body) resistance at trminal .Then, the impedance is lowered at IC stationselector output terminal and current flowsai shown by the arrow marks in Fig. 9. Consequ-enlly, because th

27、e supply voltage 10 the varactorruner diode is changed by the dividing ratio ofRb and Rc, station selection is possible bymans of setting the prset volumes beforehandaccodrng to the deried broadcarl tequen.res.RadioFans.CN 收音机爱 好者资料库tVI- TUNER ADJUSTMENTIIIJLTI FUNCTIOI PC BOARD AA-5I59 E a Do.o.FM

28、IUNING METER OJ (LO*ER CORE)FM OISTORTION DJ (IPPEN CONEIa.o;K-lt:JrkHr I Ei trca.TP.oFREOUENCY OJi:i 0olH: tr,1R?.1-,7 A l r313tSuIUnJLZLSggVIS(zxru/urOg9) yu O0r Arl (d,iJ pro) dtue-lt6I0s9I:IItref r3?ads d,s89999mVOSEEV JI16S0S9I:IJoft,rr Jlz90s9IfZZIIYI JII L8 L69Tg0I0rvY s eusZOIZIV I JILno699r

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32、SC Coil RWR41497AEO650373AM-IF Trans. RLC41543A 468 kHzSame as AA-1010EO50384AMIF Trans. CFU-085-D 468 kHzES24035sRotary SW. SR26N l-3-5 30KC,s240287Rotary SW. SR26N 30 KC8S240096Push Sw. 3FT-0001FF212085240276Pushsw. 5FT-0001DF3620EV24U34Double axial 2 thow Vol(FR) DJ80D 250 kBx28V240445Single aixa

33、l 2 throw Vol. CM70R 20 kcx28YL299 tsPre-set Vol. (w/knob) LFQDRS04 I00 kB8V499364Semifixed Vol. V10K8-4-2 5kB$me as AA-10108V484863Semifixed Vol. V10K84.2 I kBE2655t8?75P ntenna Trminal Plates8607t38Push Knob C A5-5022sK6468 t 7Single Knob AA.5250sK644670Double Knob (UppD A-s3ssSame asAA-1010sK6452

34、08Double Knob (Lowet A-s3s3sK646828Tuning Knob (Snall ) A-5252s2645243Circula Foot A CA.60l4TA240300VaractorTuner VFT-22MH-21RadioFans.CN 收音机爱 好者资料库Ir ?t-9l9ttt?-9-9? ozIzrl I000llf s qsnd 96oo?zstzt+t lc)gr?o porc r.uz 99rorzaa3le.t-sr (rx,I)r/9asrrorscu?tJ 99t99913sxe peq wd iaDs gaozznszv a$s duz

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