FT-7800R维修手册

DualBandFMTransceiverFT-7800RTechnicalSupplementIntroductionThismanualprovidestechnicalinformationnecessaryforservicingtheFT-7800RTransceiver.Servicingthisequipmentrequiresexpertiseinhandlingsurface-mountchipcomponents.Attemptsbynon-qualifiedpersonstoservicethisequipmentmayresultinpermanentdamagenotcoveredbythewarranty,andmaybeillegalinsomecountries.TwoPCBlayoutdiagramsareprovidedforeachdouble-sidedcircuitboardinthetransceiver.Eachsideofthrboardisreferredtobythetypeofthemajorityofcomponentsinstalledonthatside(“leaded”or“chip-only”).Inmostcasesonesidehasonlychipcomponents,andtheotherhaseitheramixtureofbothchipandleadedcomponents(trimmers,coils,electrolyticcapacitors,ICs,etc.),orleadedcomponentsonly.Whilewebelievethetechnicalinformationinthismanualtobecorrect,VertexStandardassumesnoliabilityfordam-agethatmayoccurasaresultoftypographicalorothererrorsthatmaybepresent.Yourcooperationinpointingoutanyinconsistenciesinthetechnicalinformationwouldbeappreciated.Specifications................................................A-1ExplodedView&MiscellaneousParts.....B-1BlockDiagram................................................C-1CircuitDescription.......................................D-1Alignment.......................................................E-1ContentsBoardUnit(Schematics,Layouts&Parts)MAINUnit.................................................F-1PANELUnit.............................................G-1CHUnit.....................................................H-1©2003VERTEXSTANDARDCO.,LTD.(EH016M90A)VERTEXSTANDARDCO.,LTD.4-8-8Nakameguro,Meguro-Ku,Tokyo153-8644,JapanVERTEXSTANDARDUSHeadquarters10900WalkerStreet,Cypress,CA90630,U.S.A.YAESUEUROPEB.V.P.O.Box75525,1118ZNSchiphol,TheNetherlandsYAESUUKLTD.Unit12,SunValleyBusinessPark,WinnallCloseWinchester,Hampshire,SO230LB,U.K.VERTEXSTANDARDHKLTD.Unit5,20/F.,SeaviewCentre,139-141HoiBunRoad,KwunTong,Kowloon,HongKongSpecificationsGeneralFrequencyRange:RX:108.000-520.000MHz,700.000-999.995MHz(CellularBlocked)TX:144.000-148.000MHzor144.000-146.000MHz,430.000-450.000MHzor430.000-440.000MHzChannelSteps:5/10/12.5/15/20/25/50/100kHzModesofEmission:F3E,F2D,F2AAntennaImpedance:50Ohms,unbalanced(AntennaDuplexerbuilt-in)FrequencyStability:±5ppm@14°F~+140°F(–10°C~+60°C)OperatingTemperatureRange:–4°F~+140°F(–20°C~+60°C)SupplyVoltage:13.8VDC(±15%),negativegroundCurrentConsumption(Approx.):RX:0.5A(Squelched)TX:8.5ACaseSize(WxHxD):5.5”x1.6”x6.6”(140x41.5x168mm)(w/oknobs&connectors)Weight(Approx.):2.2lb.(1kg)TransmitterOutputPower:50/20/10/5W(144MHz)40/20/10/5W(430MHz)ModulationType:VariableReactanceMaximumDeviation:±5kHzSpuriousRadiation:Atleast–60dBbelowMicrophoneImpedance:2kΩDATAJackImpedance:10kΩReceiverCircuitType:Double-conversionsuperheterodyneIntermediateFrequencies:45.05MHz/450kHzSensitivity:0.8µV(TYP)for10dBSN(108-137MHz,AM)0.2µVfor12dBSINAD(137-150MHz,FM)0.25µVfor12dBSINAD(150-174MHz,FM)0.3µV(TYP)for12dBSINAD(174-222MHz,FM)0.25µV(TYP)for12dBSINAD(222-300MHz,FM)0.8µV(TYP)for10dBSN(300-336MHz,AM)0.25µVfor12dBSINAD(336-420MHz,FM)0.2µVfor12dBSINAD(420-520MHz,FM)0.4µV(TYP)for12dBSINAD(800-900MHz,FM)0.8µV(TYP)for12dBSINAD(900-999.99MHz,FM)SquelchSensitivity:Betterthan0.16µVSelectivity(–6dB/–60dB):12kHz/30kHzMaximumAFOutput:2W@8Ωfor10%THDAFOutputImpedance:4-16ΩSpecificationsaresubjecttochangewithoutnotice,andareguaranteedwithinthe144and430MHzamateurbandsonly.Frequencyrangeswillvaryaccordingtotransceiverversion;checkwithyourdealer.A-1B-1ExplodedView&MiscellaneousPartsM2090034AFANP1090984CONNECTOR(Ver:USA)RA0552200LCDSPACERRA0540800LCDHOLDERG6090155LCDRA0539900RUBBERKNOBRA0540700LIGHTGUIDERA0551900REFLECTORSHEETRA0540900INTERCONNECTORRA0541400FRONTPANELASSY(W/WINDOW,DOUBLEFACETAPE)RA0540200KNOBRA0540100ENCODERKNOBRA0540300KNOBQ9000804ROTARYENCODER(W/HEXNUT*,WASHER*)RA0551800DIFFUSERSHEETCHUNITPANELUNITRA0540200KNOBS5000206FANGUARDM4090149SPEAKERT9206438AWIREASSYR0150630HOLDERRA02132A0HIMERONTAPERA0438700RUBBERRA02668AACHASSISRA0551700REARPANELASSY(W/COILSPRING,RELEASEKNOB)RA0540400RELEASEKNOBRA0022900COILSPRINGT9101536CTCABLERA0539800SUBPANELCS1804001CASE(W/NYLONNET)RA0322600RUBBERSHEETT9206876WIREASSYRA0415200(x2pcs)GROUNDPLATEP1090547CONNECTOR(Ver:EXP,AUS)S5000236WASHER(Ver:EXP,AUS)P1091107CONNECTORT9207057WIREASSY







**Non-designatedpartsareavailableonlyaspartofadesignatedassembly.MAINUNITSUPPLIEDACCESSORIESVXSTDP/NDESCRIPTIONQ0000081FUSE15A(x2pcs)AAA43X001MICMH-48A6JT9021715DCCABLER8139500LABELR8139500LABELSCREWLISTNo.VXSTDP/NDESCRIPTIONQTY.
U31208007OVALHEADSCREWM2.6X8B8U44308002TAPTITESCREWM3X8NI17U03310002SEMSSCREWASM3X10NI4U20308002BINDINGHEADSCREWM3X8NI2U25320007TAPTITESCREWM3X20B4U23116007TAPTITESCREWM2X16B5U31206007OVALHEADSCREWM2.6X6B6B-2NoteExplodedView&MiscellaneousPartsD-1BlockDiagramD-2NoteBlockDiagramCircuitDescriptionVHFReceptionTheincomingVHFsignalispassedthroughalow-passfilternetwork,antennaswitchingdiodesD1074(RLS135),D1075(RLS135)andD1015(HVC131),andanotherlow-passfilternetworktotheRFamplifierQ1008(3SK296ZQ).Theamp