Hitachi-SR2004-rec-sm 维修电路原理图.pdf

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1、.,SERVICEMANUALEnglishFranc;aisNo. 128SPECIFICATIONSFMSECTION85 dB45 dBI dB60dB50dB(IkHz)70dB70dB28dBf(14pV)300ohmsbalanced, 75 ohms unbalancedFrequency rangeUsable sensitivity50dB Quieting sensitivitySignal-to-noiseratio(at 6S dBf)Harmonicdistortion(at6S dBf)NARROW100HzI kHz6kHzWIDE100HzI kHz6 kHzF

2、requency responseImage responseratioSpurious responseratioIF responseratioAlternate channel selectivityNARROWWIDECapture ratioAMsuppressionStereoseparationSubcarrier suppressionSeArejectionMuting thresholdAntennainput88- 108 MHzMono: 8.7dBf(1.5pV)Mono: 12.5 dBf (2.3pV)Mono:75dBMono: 0.15%Mono: 0.1%M

3、ono: 0.25%Mono: 0.15%Mono: 0.07%Mono: 0.2%30Hz-ISkHzC:aG)115dB120dBI5dBStereo: 24dBf(8.9pV)Inside the parenthesisIHF58Stereo:36dBf(34.5pV)Stereo:70dBStereo:0.25%Stereo: 0.2%Stereo: 0.3%Stereo:0.25%Stereo: 0.1%Stereo: 0.3%-.STEREORECEIVERNovember 1977RadioFans.CN 收音机爱 好者资料库HITACHISR-2004AMSECTIONFreq

4、uencyrangeSensitivityImage rejectionIF rejectionSelectivity (IHF)Signal-to-noise rarioAntennaAUDIOSECTIONOutputRMSpower(Bothchannels driven)Music power (IHF)PowerbandwidthFrequencycharacteristicsHarmonic distortion(atratedoutput)(at!zratedoutput)Intermodulationdistortion(atratedoutput)(at!zratedoutp

5、ut)Inputsensitivity(at200Woutput,I kHz)PHONOI,PHONO 2AUXTAPE-ITAPE-2ADAPTORDINMICMax.inputlevel (PHONO)OutputlevelTAPE OUTDIN OUTSignal-to-noise ratio(IHF,inputshorted,A-network, rated power)PHONO1,2AUXTAPE1,2Damping factorEqualizerBasscontrolMidrangecontrolTreblecontrol530- 1,605 kHz370llY/m(S/N20d

6、B), 20llY (IHF,ext.Antenna)70dB90dB40dB50dBFerrite and Separate terminal200watts per channel, min. RMS, at 8ohmsfrom 20 Hz to20kHz, with no morethan0.08%total harmonic distortion.230W/ch+230W/ch (8 ohms, I kHz, T.H.D. 0.08%)230W/ch+230W/ch(4ohms,1 kHz, T.H.D. 0.1%)400W/ch+400W/ch (8ohms)10 Hz -40kHz

7、PHONO30 Hz -15kHz 0.2 dBAUX10Hz -40kHz 1.5 dBLess than 0.08%Less than 0.03%0.08%0.03%2.5 mY (47 k ohms)150 mY(50k ohms)150 mY (35 k ohms)150 mY (35 k ohms)150 mY (35 k ohms)450mY(95kohms)3 mY (50 k ohms)500mY150 mY (PHONO, AUXatratedinput)200 mY (FM400Hz, 30% dev.input:1 mY)150 mY (AM400Hz, 30%mod.i

8、nput:5mY/m)40mY (PHONOatratedinput)75 dB90dB90dB75(lkHz,8ohms)RIAA 0.2 dB10dB(at50Hz turnover frequency 150 Hz)10 dB (at 100 Hz turnover frequency300Hz)6 dB (at 1 kHz)flOdB (at 10 kHzturnoverfrequency 3 kHz)I0dB(at 20 kHzturnoverfrequency 6 kHz)-2-eeRadioFans.CN 收音机爱 好者资料库eLoudnesscontrol(Volumecont

9、rolsetat-33dB position)High filterLow filterAudiomutingeffectTapemonitorSpeaker switchTuningmeterPowermeterACoutletSpeaker terminalFMMUTING/AUTO LOCKMPX noise filterIFBAND filterMULTIPATHfilterPre/main amplifiersAdaptorswitchPower supplyPowerconsumptionDimensionsWeight+9 dB(100Hz),+4dB(10kHz)-10dBat

10、10 kHz (12 dB/oct.)-10dBat50Hz (12 dB/oct.)-20dB, 0 dB,-40dB1,2A,B,C,A+B,B+C,C+A,OFF223(Oneswitched50W&2 unswitchedtotal150W)OnetouchterminalProvidedProvidedNARROWandWIDEProvidedSeparableProvidedAC120V60Hz850W580(W)x186(H)x447(D)mm22-3/4(W)x7-1/2 (H)x17-1/2(D)in.25.5 kg(56.2Ibs.)HITACHISR-2004eSpeci

11、ficationsanddesigns maybechangedwithoutnotice forimprovement.CARACTERISTIQUES TECHNIQUES85 dB45 dB1dB60dB50dB(1kHz)70dB70dB28dBf(1411V)300ohmsponderes, 75ohmsnon ponderesMono: 0,15%Stereo: 0,25%Mono: 0,1%Stereo: 0,2%Mono: 0,25%Stereo: 0,3%Mono:0,15%Stereo: 0,25%Mono: 0,07%Stereo: 0,1%Mono: 0,2%Stere

12、o: 0,3%30Hz -15kHzeB)115 dB.120dB115 dB-SECTIONFMBandedefrequenceSensibilite utilisableSeuil de sensibilite50dBRapportsignal/bruit(65dBf)Distorsionharmonique(65dBf)NARROW100Hz1 kHz6 kHzWIDE100Hz1 kHz6 kHzReponsedefrequenceRapportde selectiviteRapportdereceptionnonselectiveRapportdereceptiondemoyenne

13、frequenceSelectiviteducanal de rechangeNARROWWIDERapportde captageSuppressionAMSeparation stereoFiltrage de la sous-porteuseRejection SCASeuildeliminationdes parasitesEntree deIantenne88-108MHzMono: 8,7dBf(1,5I1V)Mono: 12,5dBf(2,3I1V)Mono: 75 dBStereo: 24 dBf(8,9I1V)Entreparentheses:IHF58Stereo:36dB

14、f(34,5I1V)Stereo:70dB-3-HITACHISR-2004SECTIONAMBandede frequenceSensibiliteRejetimageRejet MFSelectivite(IHF)Rapportsignal/bruitAntenneSECTIONAUDIOSortiePuissance nominalePuissance musicaleSortiebandepassanteBande passanteDistorsion harmonique(ala puissance reelle)(ala moitie delapuissance reelle)Di

15、storsiondintermodulation(a la puissance reelle)(ala moitie de la puissancertelle)Sensibilite dentree(sous200W,1 kHz de sortie)PHONOI,PHONO 2AUXBande-IBande-2ADAPTORDINMICNiveaudentreemaxima (PHONO)Bornes de sortieTAPEOUTDIN OUTRapportsignal/bruit(IHF,reseau A, puissance nominale)PHONO1,2AUXTAPE1,2Fa

16、cteurdattenuationCompensateurCommandedes gravesCommandedes mediumsCommandedes aigusSonorite(Ensemble decommandeduvolume position-33dB)530-1.605 kHz370llY/m(S/B 20 dB), 20llY(Antenneext., IHF)70dB90dB40dB50dBAntenne de ferrite avec borne separee200W/ch +200W/ch (8 ohms,20Hz -20kHz, T.H.D. 0,08%)230W/

17、ch + 230 W/ch(8ohms,I kHz, T.H.D. 0,08%)230W/ch + 230 W/ch(4ohms, 1 kHz, T.H.D. 0,1%)400W/ch +400W/ch (8 ohms)10 Hz -40kHzPHONO30 Hz -15kHz 0,2 dBAUX10Hz-40kHz 1,5dB0,08%0,03%0,08%0,03%2,5 mY(47kohms)150mY(50kohms)150 mY (35 k ohms)ISO mY (35 k ohms)150 mY (35 k ohms)450mY (95kohms)3 mY(50k ohms)500

18、mY150 mY (PHONO, AUXalentreenominale)200mY(FM400Hz, 30%dentreedev.: 1 mY)150 mY(AM400Hz, 30%dentreemod.: 5 mY/m)40mY (PHONOalentreenominale)75dB90dB90dB75(IkHz,8ohms)RIAA 0,2dBIOdB(a50Hz, frequence de renversement 150 Hz)IOdB(a100 Hz, frequencederenversement300Hz)6dB(a I kHz)IOdB(a 10 kHz, frequence

19、 de renversement 3 kHz)IOdB(a20 kHz, frequence de renversement 6 kHz)+9dB(100Hz), +4dB(10kHz)-4-eFiltre hautFiltre basEffet de sourdine audioContrOie de bandeInterrupteur de haut-parleursIndicateur de syntonisationIndicateur de puissanceSortie C.A.Borne de haut-parleurFMMUTING/AUTO LOCKFiltre de bru

20、it parasiteMPXFiltre de bande FIFiltre de trajets multiplesPreampli/Ampli principalCommutateur dadaptateurAlimentationConsommationDimensionsPoidsHITACHISR-2004-10dBa10 kHz (12 dB/oct.)-10dBa50 Hz (12 dB/oct.)-20dB, 0 dB, - 40dB1,2A,B,C,A+B,B+C,C+A,OFF223 (Unede50 Wraccordee, et deuxde150 Wnon raccor

21、dee)Borneaune toucheIncorporeIncorporePosition WIDEetNARROWIncorporeSeparesIncorporeSecteur 120 V 60Hz850W580 (L) x 186 (H) x 447 (P) mm25,5 kgLescaracteristiques techniques et la presentation peuvent etre modifiees sans preavis par suite dameIiorations.IMPORTANT NOTICEe(1) When measuring the output

22、 power or listeningtoprogram sources with the 4-0HMS load impedance,do not drive the Model SR-2004 at full power for along periodoftime.(2) When using the model with a continuousoutputofover 200 watts, the protection indicator will lightup and the sound will sometimes be interrupted.This does not in

23、dicate a breakdown. In such cases,tumoffthe power, turn down the volume level andthen wait 30 seconds before switching the powerback on again.(3) The Model SR-2004 has two typesofelectronic pro-tection circuits; a shut-down circuit and currentlimiter circuit.Ifthe shut-down circuitisactuated,theoutp

24、utofthe amplifieriscut off.When only the current limiter circuitisactuated,the operationofthe power amplifierisnotshutdown.(4) Before takingoffthe couplers from the PRE OUTand MAIN IN terminals on the rear panel, make surethat POWER switchissettoOFF andthattheattenuator volumeissettothe lower positi

25、on(00).(5) Set theMICMIXING volume controltoOFF whenyou are not using the microphone.total et un circuit de limitationdecourant. DansIecas oilIecircuit de coupure totale est active, la sor-tiedeIamplificateur est coupee.Quand seulIecircuitdelimitation de courant estactive, lamplificateur continueafo

26、nctionner.(4) Avantderetirer les barres daccouplement des bor-nes PRE OUT etMAININdu panneau arriere,prendre bien soindeverifier queIecommutateurdalimentation est bienmissur1aposition OFF(arret)etqueIevolumedeIattenuateur est sur laposition la plus basse(00).(5) Mettrelacommandedevolumedemelange mic

27、ro(MICMIXING) surlaposition OFFsivous nutilisez,pasIemicrophone.-AVERTISSEMENT IMPORTANT-(1) Quand on mesurelapuissance en sortie ou que Ionecoute des sources de programmes avec Iimpe-dancedecharge de 4-ohms,nepas faire fonctionnerIemodele SR-2004apleine puissance pendant unelongue periode de temps.

28、(2) Quandonutilise cet appareil avec un debit continuelde puissance depassant 200 watts,Ievoyant de pro-tection peut sallumer etIeson peut quelquefoissinterrompre. Ceci ne veut pas dire quil y ait unepanne. Dans de tels cas, couper lalimentation, bais-serIeniveau du son, et puis attendre environ 30s

29、econdes avant de reaIimenter Iappareil.(3)Lemodele SR-2004 est equipededeux types de cir-cuits de protection electronique; un circuit darret-5-HITACHISR-2004-.-FEATURESTunerSection-1.Dual Gate MOS FET for High QualityFMTunerThree Dual Gate MOSFETsinthefront-endand5-gangvariablecapacitorsofferexcelle

30、ntFMsensitivity(I.5j1V), intermodulation characteristics, high S!N ratioandspurious rejection.2.Auto-LockCircuitTostabilize tuning, anAuto-Lockcircuitisprovided.This circuit engages immediately whenyourelease thetuningknobafter precise tuning.Justbytouching thetuningknob,you can disengagetheAuto-Loc

31、k circuitfor(theAuto-Lock indicator goesoff)fine tuning.Releasingthetuning knob re-engagestheAutoLockcircuit which automatically stabilizes the tuning circuitandlocksontothe station selected for a high S!N ratioandlow distortion.3.IFBAND Selector Switch for Flexible Selectivity andSAWFILTER for Low

32、DistortionIFBAND selector switchisprovided in theFMIF stagetoprovide a selectivitythatmeets different receivingconditions.In the WIDE position,theSAWFILTER,which hassuperior group delay characteristics in the wide fre-quencyrange, andthe4-poleLCLINEAR PHASEFILTERoffer sound withextralow distortion.I

33、ntheNARROWposition,the2 LINEAR PHASECERAMICFILTERwill alsooperatetocutouttheinterference sharply by high selectivity.4.High-Selectivity and Low-Distortion IF Amplifier usingICsand3 Ceramic FiltersA 6-stage differential amplifierisemployed.The exten-sive useof3Ies,andtwoceramic filter elements in the

34、IF stage,thathave good phase characteristics, in theFM-IF amplifier greatly improvesthelimiter and selectivitycharacteristics.5.QuadratureDetectionQuadrature detectionwiththeextensive useofIeshasa widebandcoverage and lowdistortion.6.Phase-Locked LoopICforFM/MPX CircuitA PLL-IC, which was developedb

35、yHitachi,isused fortheFM!MPX circuit for a high separationandlow dis-tortion.Also, high reliabilityisachieved with respect totemperatureand aging.7.Reed Relays for CuttingoutDetuning NoiseIn theFMMUTE position,twoReed Relays are pro-vided inFMaudiooutputstagetocutoutdetuningnoise.8.MPX NOISE FILTERS

36、ometimeshighfrequency noisepreventsyoufromobtaininghi-fidelityFMstereo reception. With somereceivers,youhavetolistentobroadcastsinmonotoreduce this noise.TheMPX NOISEFILTERcan be usedtoreduce thisnoisewithoutimparingtheFMstereo effect.9.FMMULTIPATH Switch with MeterforBestFMReceptionDirect signals a

37、nd signals reflected by mountains andbuildings cause a multipath effect. This increases dis-tortionand downgrades separation.Toeliminate this trouble, thereisamultipathdetectioncircuit which operates together withthesignal meter.10.3-gang Variable Capacitor for High SelectivityAMReceptionA 3-gang va

38、riable capacitorisprovided for achieving highsensitivity and selectivity duringAMreception.11. Ceramic Filter,ICsinAMTunerA ceramic filterisemployed intheAMtunertoobtainenhancedselectivity and AGC characteristics. The exten-sive useofIesimproves stable reception.12.TwoLarge Easy-to-Read Metersanda L

39、arge-sized Fly-wheel Tuning KnobTwoeasy-to-read meters are usedtoindicate the signalandtuninglevels.The dial mechanism employs a large-sized fly-wheel witha highmomentofinertia for easy operation.AudioSection-1. Newly Developed High-Efficiency High-PowerAudioAmplifier (Series E . Class GorDynaharmon

40、yAmplifier)This amplifier delivers a higherdynamicoUlpuCpower(400W per channel, 8 ohms)withoutdistortion thanconventional class-B amplifiers.Therelative low powerconsumptionofclass G opera-tion minimizes thehealsinkofthepower transistors andthe weightandsizeofthe whole amplifier.This amplifier has t

41、winDCpower supplies.Under thismethod,c1ass-Goperationcan deliver dy-namic power whichismorethantwice the valueofthemaximumratedoutputpowerormore.2. Twin Power Meters(Land R channels)Toseetheactual poweroutputwhileyouare listening,combinedtwo new attractivepowermeters are provided.3.MidrangeToneContr

42、olThis amplifier hasnotonly BASSandTREBLE tonecontrolsbutalso a MIDRANGEtonecontrol.Bysetting these three controls,youcan choosethepre-ferred frequency characteristicsoftheamplifier.Thecontrols all have11click-stopcontactpoints.This feature offers good feel which makes for easier set-tingandresettin

43、g.4.Turnoverand Tone Defeat SwitchesThis model hastwoturnover switches for adjusting thelowandhigh frequency characteristics independently.Each switch has two turnover frequency settings.Inordertomake flat frequency characteristicswithouttouchingtonecontrolstonedefeat functions are alsoprovided. You

44、 can adjust the frequency characteristicstomeetthe acoustic conditionsofyoulistening roomandtosuityourtaste.5.CalibratedAttenuator(Volume Control)A precisely calibrated 32- click-stopcontactpointatten-uatorisused for the volumecontrol.This makes foreasier setting and resettingofthedesired poweroutpu

45、tlevel.6.AudioMuting SwitchThis switchisvery useful when loweringthesound levelwithouttouching the levelattenuator.You can choosebetweentwoattenuation values(-20dB,-40dB).Further,a more precise and flexible settingandresettingofoutputlevel can be achievedbycombining the levelattenuatorand the muting

46、 switch.7. Mic MixingA mic mixing circuitisincorporatedin this model.Justconnecta microphone andyouwill be abletomixsoundsfromthemicrophonewithotherprogramsources.ee-6-8. Tape DubbingTape dubbing can be done either from TAPE-ItoTAPE-2 or vice versa. Thereisalso a sourcemonitorcircuit,with which tape

47、 dubbingispossible whi!e listeningtoanFMbroadcast or a record.9. Low Filter and High FilterThe low filter cutsoutthe low frequency noise suchasrumble from a turntable and the high filter cuts out thehigh frequency noise suchasnoise from scratchesonrecords and high frequency noise while listeningtoFM

48、broadcasts.CARACTERISTIQUESSection Tuner-1.MOSFETadouble porte pour un TunerFMde hautequaliteLes troisMaSFETa double porte montes dans letagedattaqueet les 5 groupes de condensateurs variablespermettentdobtenirune sensibiliteFMexcellente (1,5IlV), des caracteristiques dintermodulation,unrapportsigna

49、l/bruit tres eleve et une suppression des parasites.2. Circuit auto-verrouillablePour stabiliser la syntonisation,uncircuit auto-verroui!-lable est installe. Ce circuit senc1enche immediatementdes que vous reliichezIeboutonde syntonisation apresavoirobtenuun accord parfait. Cest justeentouchantIebou

50、tonde syntonisation que vous desactivezIecircuitauto-verrouillable (Ie voyant du circuit seteint), pouvantproceder ainsi a une syntonisation precise. Quand vouslachez a nouveauIeboutonde syntonisation,Iecircuitauto-verrouillablesereenc1encheraautomatiquementstabilisant ainsiIecircuit de syntonisatio