Technics-STG90L-tun-sm 电路图 维修手册.pdf

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1、ORDERNO.AD8804015C2 Service cUIRTZSynthesizer LWIMWIFMStereoTuner SPECIFICATIONS (DIN45500) FMTUNERSECTION Frequencyrange- Sensltlvity SIN30dB SIN26dB SIN20dB IHF46dBstereoquletingsensltivity Totaiharmonlcdistortion MONO(formai) STEREO(normai) SIN MONO STEREO Frequencyresponso Alternatechannelselect

2、ivity normal400kHz supernarrow200kHz Captureratio Imagerejectlonat98MHz IFrejeciionai98MHz Spuriousresponserejectlonai98MHz AMsuppresslon Stereoseparation ikHz 70kHz 0.075% 0.02% 55dB 30dB 1.0dB 730dB 730dB 130dB 55dB 60dB 45dB nual Tuner ST-G9OL Area Carrierleak 19kHz 38kHz Channelbalance(250Hz6,30

3、0Hz) Llmltlngpoint Bandwidth IFamplifler FMdemodulator Antennatermlnals AMTUNERSECTION Frequencyrango MW Sensitivity(SIN20dB) MW LW Selectivity(9kHz) MW(at 999kHz) LW(ai254kHz) Color Technics MatsushitaElectric IndustrialCo.,Ltd. (K).BlackType ColorArea (K)(EK)UnitedKingdom. (K)(EB)Belgium. (K)(EF)F

4、rance. (K)(EW)Switzerland. 87.50-108.00MHz 87.525-108.00MHz (+25kHzshift) 1.5pV(IHF,usable) 7.3,iV(750) 1.21V(750) 0.9pV(750) 28pV/750 80dB(86dB, 1H9 74dB(79dB,IHF) 4Hzl5kHz,+0.5dB0.5dB LW 75dB(80dB,IHF) 75dB(80dB,IHF) 1.0dB 0.851jV 180kHz 1000kHz 750(unbalanced) 522kHz1611kHz(9kHz-steps) 53OkHzl62O

5、kHz(lOkHz-steps) 155kHz353kHz(9kHz-steps) l53kHz351kHz(2kHzshift) 2011V,3001IV/m 5OpV 50dB 50dB CentralPD.Box288,Osaka530-91,Japan RadioFans.CN 收音机爱 好者资料库 ST-G9OL Imagerejection MW(at999kHz) LW(at254kHz) IFrejectlon MW(at999kHz) LW(at254kHz) GENERAL OutputVoltage Powerconsumptlon Powersupply ForUnlt

6、ed Klngdom 40dB 40dB 60dB 35dB 0.3V(0.6VIHF) 9.5W AC50Hz/60Hz,240V ForcontinontalEurope Dimenslons(WxHxD) Welght Notes: CONTENTS Page CONNECTIONS 2 LOCATIONOFCONTROLS 3,4 DISASSEMBLYINSTRUCTIONS 5 MEASUREMENTSANDADJUSTMENTS6-10 FUNCTIONOFTERMINAL (1C901:M50941421SP) 11,72 RESISTORShighfrequency)band

7、to thesupernarrow”bandwidth. -setfreqonly: Bylightlytappingthisselector,thepresenceornotof interferencesignaiswithinthebroadcastsignalsbeing receivedisdetected,andthereIsanautomaticswitchoverto eitherthe“normal”or“supernarrow”circuitryas appropriate. allpresetCh: Ifthisselectorispressedandheld foras

8、lightlylongertime, thepresenceornotofinterferencesignalswithinthe broadcastsignalsofallEMbroadcaststationsthathavebeen presettotheunitsmemoryisdetected.Thereisthenan automaticswitchovertoeitherthe“normal” or“super narrowcircuitryasappropriate,andthenanentryis automaticallymade(tothememoryforthesesam

9、e “channels”)ofthe“normal”or“supernarrowreception condition. Quartz-lockindicator(quartzIock) ThisindicatorilluminateswhentunedpreciselytoanEMor AMstation. JFMRF/IFband indcator(RF/IFband) TheseindicatorsshowtheEMreception conditions. FMRF/lFautomatic-selectindicator(RFIFauto) Thisindicatorilluminat

10、eswhentheFMRE-bandautomatic selectorispressed. FMsignal-strengthdisplay(FMsignal) ThisdisplayusuallyshowsthereceptionlevelofEM broadcasts(maximum86dB);whenthescan-levelselector ispressedandheld,thestation-tuninglevelisdisplayedin thesequence304050. Recording-level-checkindicator(rec) jFMstereoindica

11、tor(stereo) Thisindicator automaticallyilluminateswhenanFMsterco broadcastisbeing received. ltwillnotilluminateiftheEMmodeselectorIssettothe monauralmode. Memoryindicator(memo) Thisindicatorilluminateswhenthememorybuttonis pressed. FMmodeindicator(FMmode) WhenEMbroadcastsare being received,usuallyth

12、eauto” indicationisilluminated.WhentheEMmodeselectoris usedtoselectmonauralreception,theilluminationof theFMmodeindicatorchangestothe“mono”position. Channeldisplay(presetCh) Thechannel numberselectedbythepreset-tuning buttons Isdisplayed. Digitalfrequencydisplay ThereceptionfrequencyoftheEMorAMbroad

13、cast selected byusingthetuningcontrolorthepreset-tuningbuttonsis indicated. j Bandindicator(band) Displaysection 4 DISASSEMBLYINSTRUCTIONS STG9OL (1)Howto removethemainP.C.B. Removethe3screws(OO). Removethe2tabsandthefront panel. Removethe8screws(OO). (2)HowtoremovethepowersupplyP.C.B. Removethe5scr

14、ewstO). Ref.No. HowtoremovetheLEDloperationSW P.C.B.,RFbandselectorP.C.B.and Procedure tuningVRP.C.B. i2-3 (1)HowtoremovetheLEDloperationSWP.C.B. Removethe8screws(O-O). (2)HowtoremovetheRFbandselector P.C.B. Removethe3screws(). (3)HowtoremovethetuningVRRC.B. RemovethetuningVRwithhexagonal wrench. Re

15、movethenut. Ref.No. Howto removethecabinet i Procedure I I Removethe5screws(00). i O o o o Ref.No.Howto removethemainP.C.B. 2andpowersupplyP.C.B. Procedure i 2 SelectSW P.C.B. selectorP.C.B. Ref.No.HowtoremovethequartzIockLED 4P.C.B. Procedure Removethe2tabs. i*2-+4 LE holder Quartz10cR LEDPC.B. 5 S

16、T-G9OL MEASUREMENTSANDADJUSTMENTS LWIMWIFM Note:ForL302,L303fL.P.F.)andL251 (LWANTcoli),theyaresuppliedasadjustedparte. So,donotturnthecoresofthe parts MWIFADJUSTMENT 1.TestequipmentconnectionIsshownInfigure. 2.Set theto“MW”mode. 3.Settheradiofrequencydisplayandsignalgeneratorto 450kHz. 4.AdJustT201

17、formaxlmumoutput. AMSiGNAL GENERATORCONDITLON Modulation30% Modulationfrequency400Hz ACEVMOscilloscope AMSG TchussIS Capacitor 200pF MW.RFADJUSTMENT 1.Test equipmentconnectionIsshowninfigure(1). 2.Set theunitto“MW”mode. 3.Settheradiofrequencydisplayandsignaigeneratorto 522kHz. 4.AdjustC204so thatthe

18、voltagemesuredInsignalmodeIs 1.0V. 5.TestequipmentconnectionisshownInfigure(2). 6.Settheradiofrequency displayandsignaigeneratorto 612kHz. 7.AdustL203formaximumoutput. 8.SettheradiofrequencydispIay andsignaigeneratorto 1503kHz. 9.AdjustC1201formaximumoutput. 10.Repeatsteps69. Note:AntennaInputlevelm

19、ustbeas10waspossiblebeing treefromAGC. DCEVM H0TO Pigure(1) AMSIGNAL GENERATORCONDITION Modulation30% Modulationfrequency400Hz AQEVUOscilioscop. AM-SG IUniio ISQ 0000 : - AhIANT CapacitorOutput 200pF tiennln Figure(2) LW-RFADJUSTMENT 1.Testequipment connectionisshowninfigure. 2.Settheunitto“LW”mode.

20、 3.Settheradiofrequencydispiayandsignaigeneratorto 155kHz. 4.AdjustL252formaximumoutput. 5.Set theradiofrequencydisplayand s)gnalgeneratorto 353kHz. 6AdjustCT251fotmaximumoutput. 7.Repeatsteps36. Note:Antennainputleve)mustbeasiowaspossibie beingfreefromAGC. AMSIGNALGENERATORCONDITION Moduiation30% M

21、odu)at)onfrequency400Hz ACEVU OaCliloscopm CapacitorOutput 200pF terminai Controipositionsandequlpmentused AMandFMsignalgenerator(AMandFM-SG) ChokecoilflOOiiH) Stereo moduiator Resistor(100k2) Distortionana)yser Ceramiccapacitor(200p9 Dscil)oscope ACandDCelectronicvoltmeter(EVM) Frequencycounter 6 F

22、M-RFADUSTMENT 1.TestequipmentconnectionIsshowninfigure. 2.SettheunittoFMandformai”mode. 3.Settheradiofrequency displayandsignalgeneratorto 90.1MHz. ST-G9OL FMSIGNALGENERATORCONDITION Modulation100% Modulationfrequency1kHz 4.AdjustLi,L2andL4formaximumoutput. 5.Settheradiofrequencydisplayandsignaigene

23、ratorto 106.1MHz. 6.AdjustCT1, CT2andCT3formaximumoutput. 7.Repeatsteps5and6. ACEVMOscilloscope MPXVCOADJUSTMENT 1.Testequipmentconnectionisshowninfigure. 2.Set theunittoonlauto”position. 3.Settheradiofrequency displayandsignalgeneratorto 100.10MHz. 4.AdjustVR302fori9kHz3OHzonfrequencycounter readin

24、g. USINGALTERNATE SYSTEM FMSIGNALGENERATORCONDITION Modulation0% ModulationfrequencyO Outputlevel66dB 1.Applystereosignalfromgeneratororreceive thestereo broadcast. 2.AdjustVR302untilstereoindicatorIightsup.Fixthearm ofVR302asshowninfigure. Fr.qu,ncycuotet 1oo FMS6 TPA=TP3O1,Frequencycounter:19.00kH

25、z = .sIII IUIII Out FL 000009FMANT 411% :L!75: “Sterco”0FFposltlon “Sterco”ONposition findicatorIlghtlng) Adjust polntofpllot clrcult VR302 7 T:G9OL FMDETECTION CIRCUITADJUSTMENT 1.Test equipmentconnectionIsshowninfigure. 2.Settheunltto“FMandRFnarrow”mode. 3.Settheradiofrequencydlsplayandsignalgener

26、atorto 100.10MHz. 4.AdjustthecoreofTiOlsothatthe voltagemeasuredIn signalmodeIsOmVin300mVrange.(Flg.(1) 5.Adjust1102formaximumoutput.(Fig.(2) 6.Adjustthe coreotT103sothatthe voltagemeasuredin signalmodeisOmVIn300mVrange.(Fig.(2) 7.AdjustVR104formaximum(+)onDCvoltmeterreading. 8.SettheFMsignalgenerat

27、orcondition toSTEREOL+R, ikHz90%,PILOT10%mode. 9.AdjustthecoreofT103sothatthevoltagemeasuredin signalmodeIsOmVin300mVrange.fFig.(2) FMSIGNAL GENERATORCONDITION Modulation100% ModulationfrequencyikHz Outputlevel66dB DCEVU FU-SOUnii I TPA+ i:” _ TPA=TP1OJ,TPB=TP1O2 Fig.(1) DCEVU FMSGUnii :“ _ :Isunam

28、j;9d!.clOlTi2qr(4. Ot1Oi. f. p:uJt- TPA=TP1O5,TPB=TP1O6 Fi.(2) FMSTEREODISTORTIONADJUSTMENT i.TestequipmentconnectionISshowninfigure. 2.SettheunittoFMandformai”mode. 3.Settheradiofrequencydisplayandsignalgeneratorto 100.10MHz. 4.AdjustTisothatthedistortionfactorofL-CHisminimized. 5.Makesurethatthe d

29、istortionfactorsofL.CHandR-CHare nearlythesamewitheachothertominimum. 6.Set theunitto“IFnarrow”mode. 7.AdjustT104sothatthedistortion factorofL-CHis minimized. 8.MakesurethatthedistortionfactorsofL-CHandR-CHare nearlythesamewitheachothertominimum. Note:1.Theadjustingscrewdriverused shouldbemadeof res

30、in. 2.Tishouldberotatednomore114turn(90deg.)on eitherside. 3.T104shouldberotatednomore116turn(60deg.)on eitherside. FMSIGNAL GENERATORCONDITION ModulationL”modeorR”mode45%, PiIot 10% ModulationfrequencyikHz(Pilot19kHz) Outputlevel66dB FUSG Unft I Q Qui FUANIOutput Dislortionanaiyser Storomoduiato Ad

31、just within90f60) Outputmodn.-LsrR c c c 8 SEPARATIONADJUSTMENT 1.Test equipmentconnectionsshowninfigure. 2.Set theunittoFMandformai”mode. 3.Settheradiofrequencydisplayandsignalgeneratorto 100.10MHz. 4.AdjustVR303sothattheR-CHoutputisminimized when stereomodulatorisin“L”(L-CHmoduiation)mode. 5.Adjus

32、tVR304sothat theL-CHoutputisminimizedwhen stereomodulatorisin“R”(R.CHmodulation)mode. FMSIGNALGENERATORCONDITION ModulationL”modeor“R”mode45%, Pilot10% Modulationfrequency1kHz(Pilot19kHz) Outputleve!66dB ACEV _ t-:i _ ir 000 Sterno modulato LPF(tc=t5kHz19kHz) FMIFNARROWGAINADJUSTMENT 1.Testequipment

33、connectlonIsshownInfigure. 2.Set theunitto“FMandformai”mode. 3.ChangeLCDdisplayfrom“frequency”todB”bypressing theFMsignal button. 4.Confirmthat“dB”Isindicated. 5.Settheunlt to“IFnarrow” mode. 6.AdjustVR1O5thatthe“dB”of“!Fnormal”and!Fnarrow” arethesamewitheachother. 2% FMSIGNALGENERATORCONDITION Modu

34、lation30% Modulationfrequency1kHz Outputleve!26dB FMSIGNALSTRENGTHLEVELADJUSTMENT 1.TestequipmentconnectlonISshownInfigure. 2.Settheunlt toFMandnormal”mode. 3.Settheradiofrequencydisp!ay andsignalgeneratorto 100.10MHz. 4.ChangeLCDdisplayfrom“frequencytodB”bypressing theFMsignal button. 5.AdjustVR1O3

35、so that50dBIsindicated.“50dB”is IndlcatedontheLCDdisplay. 6.AdjustVR1O2sothat70dBIslndicated.“70dB”Is indicatedontheLCDdisplay. 7.AdjustVR1O1so that86dBIslndlcated.86dBIs indicatedontheLCDdisp!ay. 8.Repeatsteps5.7 FMSIGNALGENERATORCONDITION Modulation30% Modulationfrequency1kHz Outputleve!56,76,92dB

36、 FU-SS 9I Ozi J 00000FUANT 9 ST-G9OL Adjustment PointsoaM:r .oTq SEPARATION adj. VR304 SEPARATION ad. Ly3o3 FM DETECTION CIRCUITadj. 1T102r MPXVCOadj. (19KHz) VR302 tci.i / TP1O2 FMDETcoli FM DETECTION CIRCUITad. LJ1 MWANT trimmer i (1503kHz) cT2oII o jti, o / iClO3 MWANTcoli (612kHz) I L203 I LWANT

37、 trimmer (353kHz) CT251 LWANTcoli (NoAdj.) L251 MWOSC coli (522kHz) /FM-RFadj. / (90.1MHz) / / /FM-RFadj. / (106.1MHz) / LiI A FMRFPACK Icl0i iI FM-RFadj. (90.1MHz) )L4 FM-RFad. (106.1MHz) ,JCT2 FM-RFadj. (90.1MHz) L2 I FM-RFad. (106.1MHz) HCT3 I FMiFI (100.1MHz) Nii FMSTEREO DISTORTIONad. Ti04 c FM

38、lENARROW GAINadj. FLVRI05I FMSIGNAL MW-iFadj. STRENGTH _ (450kHz) LEVELad.FMFMSINGALFMSIGNAL T201 VRiO3 I DETECTIONSTRENGTH STRENGTH CIRCUITadj.LEVELadj. LEVELad. T103 IIVRIO2I vRloi I LWOCcoii (155kHz) L252 C 10 D c FUNCTIONOFTERMINAL(1C901:M50941-421SP) ST.G9OL PINNO.INIOUTMARKDESCRIPTIONOFTERMINA

39、L i1NPUTVREF Referencevoltageterminai. 2NC Notusedinthisunit. 3ATuningvolumeup/downcontroiterminai. iNPUT 4B 5SSL1FMsignaileveidetectorterminai. 5INPUT 7SSL3 Stationdetectionofautotuningterminai. 8iNPUTSDReceived:“H”,Nosignai:“L” Stereosignaidetectionterminai. 9INPUTSTEREOStereo:“L”,Monaurai:“H” 10T

40、UNINGOTuningmodeLED(auto/manualllock)driveterminai. OUTPUT 17TUN1NGJ FMREBANDselectorterminai. 11OUTPUTREBAND“normai”:“L”,“supernarrow”:“H” EMiEBANDselectorterminai. 12OUTPUTlEBAND“normai”:“L”,“supernarrow”:“H” 13NC Notusedinthisunit. RECcarributation(333Hz)signaiterminai. 14OUTPUTRECRECswitchON:“H”

41、,RECswitch0FF:“L” Forcibiemonauraiseiectionterminai. 4.8V 15OUTPUTMONO Forcibiemonauralmode TerminaitoeliminateshocknoiseduetouniockingatPLL. Pin25(CE)is“L”H”or“H”L” 16OUTPUTMUTEPowerswitch“off”. Frequencychange.(upldown,FMAM(MW/LW),REC). FMRE/lEseiection. 18 SRDY PLLdata_outputterminai. 19OUTPUTCLK

42、 SRDY:seriaii/Oenabiesignal,CLK:ciocksignai, SOUT:seriaidatasignai. 20SOUT 21INPUTSIN Controiinputterminai. Ciockpuisewaveformoutputterminai. 22OUTPUTTiFM:1kHzsignai(duty50%) Ciockpuisewaveformoutputterminai. 23OUTPUT12REC“ON”:333Hzsignai(duty50%) 11 TG9OL 4. PINNO.INIOUTMARKDESCRIPTIONOFTERMINAL Re

43、mote controiinputterminai.Notusedinthisunit. 241NPUT INT1 251NPUT Powersuppiydetectionterminai. 26Groundterminai. .Vss 32 27iNPUTRESET Resetsignai terminai. 28INPUTXiNConnectingterminaiforcrystaiosciiiator. 29OUTPUTXOUT 30XC1NNotusedinthisunit. 31XCOUT 33NC Terminaiforkeyreturnsignai 34 ROtoexternai

44、keymatrix.3.6V 5iNPUT5 37R3 oiVi2msec.div. 38iNPUT Powersuppiy terminaiforFLdispiay. Segmentsignaiterminaifor 39SOFLdispaiy. 5OUTPUT UUL.JLIBL 54S1526.0V 1OV/5msec.div. 55NC Notusedinthisunit. Terminaiforkeyscansignai 56Titoexternaikeymatrixand 5OUTPUT5 gnUsignaiterminaiforFLUispiay. 62T7 .26.0V 1OV

45、/2msec.div. 63INPUTAVccPowersuppiyterminaiofdevice. 64iNPUTVcc c c c 12 RESISTORSFuseTpeMetallA:1W16;1/6W132% ERXMetalFilm$2;1/4W511/2W15% EROL;Carbon(chip)2F114W50;1/2WK10% EROK;MetalFilm(chip)2A:2W3A3WM20% ERC;Solid60;1/10W801/8W ERE;Incombustible Box-Shaped ERM;Wire-Wound RRJ;CipResistor ERI;CipR

46、esistor CapacitorTypeVoltageTolerance ECE;Electrolybc016.3VlA:10V1.10% ECCO;Ceramic1C;16VlE25V M20% ECKO;CeramicCapacitor1H;50V1V35V Z 480% ECQM;Poyester50;50V05:50V20 ECOP;Polyproplene2H:500V2A:100VJ:5% ECO;Ceramici:100V1163V13:2% ECEAN;NonPolarElectrolyticKC:400VACF:1% OCU;Caramic(ChipType)KC:125V

47、 ACC0.25pF ECUX;Ceramic(Chip Type)(UL)O:0.5pF ECE:Semiconductor EECW2Liquidelectrolyte doublelayercapacitor Ref.No.PariNo.Value.Ref.No.PariNo.Value.Ref.No.PartNo. Value. RESISTORS(VALUE.WATTAGE) R134ERDS2TJ6526.8K1/4R207 ERDS2TJS625.6K1/4 RIE110S21J104100K1/4 11135ERDS2TJI6918K1/411206ERDS2T104100K1

48、/4 112ERDS2TJ27321K1/4 11135ERDS2TJ684600K1/4 11209EROS2TJ1O21K1/4 113ERDS2TJIO4100K1,4 11131ERDS2TJ47347K1/4R210ERDS2TJ52282K1/4 114ERDS2TJ1O4100K1/4 11135ERDS2TJ4724.7K1/4R211ER0S21J47347K1/4 115ERDS211104100K1/4 11135ERDS2TJ3213)91/4R212ERDS2T1011001/4 116ERDS2TJ52352K1/4 11140ERDS2TJ2.2K1/411213

49、ERDS2TJ47347K1/4 117ERDS2TJ1(X310K1/4 11141ERDS2TJ1O21K1/4R251ERDS2TJ1O310K1/4 118ERDS2TJI00101/4 11142ERDS2TJ2.2K1/4 11252ERDS2T1521.8K1/4 119ERDS2TJIO4100K114 11143ERDS2TJ1O21K1/4R253ERDS2TJ22322K1/4 RiOERDS2TJ52O521/4 11144ERDS2TJ1021K1/411254ERDS2TJ1521.8K1/4 1111ERDS2TJ82O521/4 R145ERDS2TJ1021K1/411255ERDS2TJ47341K 14 R12ERDS2TJ52O821/4 11146ERDS2TJ1O21K1/4113)1ERDS2TJ1O4100K1/4 11101ERDS2TJ411312ERDS2TJ1O310K1.4 11111ERDS2TJ33133)1/4 11165ERDS2TJ224220K1/411314ERDS2TJ82O5214 11113ERDS2TJ1511501/4 RiSO8RDS211474470K1/