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1、 ArcamrCubeServicemanual AndyMooreissue1 RadioFans.CN Overview TherCubeinitssimplestformcanbethoughtofasahighperformanceiPoddockingstation withmorethanafewuniquefeaturestheseinclude. WirelesstransmissionfromeitheriPodtransmitter(ArcamWand)orUSB(ArcamWave)these arebothoptionalextras. rCubescantransmi
2、ttoeachotherfromadockediPodorexternalsourcewiredsource. Internalbatterypowersupply. EasilyreplaceableiPodheader(coveredlatterinmanual). Access AlthoughverycompacttherCubeisdesignedtobeserviceablewithaccessgainedfrom underneathtoallelectroniccircuits(removethefourrubberfeet)youwillseefourPhilips scre
3、ws,oncetheseareremovedthebaseplatecanbeliftedawayexposingthemaincircuit board.Themainspeakerarrayisnotconsideredaserviceablepartbutwillbeavailableasa completeassembly.Pleaseseedetailedexplodedview. Circuitdescription PSUandcharge The19VD.CPSUfortherCubeisderivedfromeitheranexternalregulatedPSUorifno
4、t presentfromtheinternallithiumionbatterypacksthefollowingisadescriptionofthePSU selection. Theexternal19VpowersupplyisconnectedtoCon600andisinternallyfusedbythe4Afuseat locationFS600therearpanelswitchcanbeseenatlocationSW600(a),D600isusedtoprevent reversebias,D602andTR600fromaD.Csensecircuitthislin
5、egoestothemainmicroat locationU301pin7. PSUselectioniscontrolbytheMAX1873SwitchmodeLichargecontrolleratlocationIC603the external19vsourcecanbeseentoarriveatpin15(DCin)andwhenpresentsimplybypasses thechipwhilstbeingmonitoredbypins1/2(currentsense)andcanbeseentoformthe19v sourcenetonthediagram.Theinte
6、rnalbatterysourcecanbeseenconnectedtoCON602and againtravelsthruthe2ndpoleofswitchesavailableonSW600(b)D605andTR603areusedto formsimplelogictoindicatetomicroU301thatbatterypowerispresent,D606allowsapathto themain19vnetwhilstpreventingreversebias,theMosfet(M601)isusedtoenablechargeif necessarywhenpowe
7、rispresenttheentirecircuitisoverseenbythemainmicroU301via RadioFans.CN PSUandchargecontinued thefeedbackgivenbyIC602allowingforintelligentchargingwithchargeenableprovidedfrom themicroviaM602onthecontrollinelabeledascharge_enablemakingaprovisionfor extendedcelllife. Multipleregulatorsareusedtosupplyt
8、he(low)voltageareasofthedesigntheseare1.4Astep downadjustableregulators,REG600receivesa19vsourceatpinonetheoutputvoltageisset byR601andR640,MosfetM600allowsforthePSUdisablewiththe3Vstandbysupplybeing tappedofpriortotheswitch. REG602andREG603operateinasimilarfashionalthoughutilizethechipsownPSUshutdo
9、wn controloptionatpin2(SD)undercontrolofmicroU301,amoreconventionalregulatorisused atlocationREG601toprovidethe1.8vcoresupplytoU301. IC601providesalogicswitched(EN_iPod_PWR)currentlimited+5vsupplytotheiPodtowhilst alsopreventinganovercurrentsituationattherearpanelUSBinput+3v1thisisreportedto themain
10、microviatheUSB_PWR_FAULTline. REG604(LDO)providesa3v1supplytotheKleerandR.Fcircuitsandissourcedfromthe+5v supply. IC600isachargepumpconvertoronthe+5VApowersupplyrail. Micro TheMicroisshownintwohalvesonthediagramshownasIC301(a)detailingportallocation andIC301(b)detailingpowersupplyrequirementsandprog
11、rammingheaderwithreset providedbyIC303. PSUrequirementsinclude3V3STBYandV1.8(internallygeneratedbytheATMEL) ThebelowtabledetailstheIC301pinallocationsandfunctions Pin number DescriptionAssociatedcircuit(s) 6AMP_TEMP_COMPin32ofpowerampsandlocationsIC504IC505IC506 7DC_PWR_PRESENTFromTR600(sheet6) 9V_I
12、OUT_POTFromIC603viaIC602MAX1873(sheet6) 10BATT_PWR_PRESENTFromTR603(sheet6) 11POS_SWSW301RearPanelBassselectswitch 12DSP_12C_SDADSPatlocationIC400 13DSP_12C_SDLDSPatLocationIC400 RadioFans.CN IC301pinallocationsandfunctionscontinued Pin number DescriptionAssociatedcircuit(s) 14INT_DISPLAYTotopplated
13、isplayviaiPodheaderboard 16STBY_LEDTotopplatedisplayviaiPodhearerboard 24ACC_POWERFromiPodheader 25IPOD_DETECTFromiPodHeader 26VID_CABLE_0FrommultipinvideoconnectoratlocationSKT200 27PSU_DISABLERegulatorsRG602andRG603 28I2C_SDlAppleauthenticationchipatlocationIC300 29I2c_SDAAppleauthenticationchipat
14、locationIC300 30UC595_CLK8bitshiftregisteratlocationIC302(A) 31UC595_DATA8bitshiftregisteratlocationIC302(A) 33PROGRAM_SWNoFit 34HOST_SPI_DATA_OUTIC405anddebug 35HOST_SPI_CLKIC405anddebug 36HOST_SPI_CS*IC405anddebug 37UC595_LATCH8bitshiftregisteratlocationIC301(A) 38USB_PWR_FAULTFromIC601 41SPI_MODE
15、0Receive/TransmittoggleviaIC403 42SPI_MODE1Receive/TransmittoggleviaIC403 43VID_CABLE_1FrommultipinvideoconnectoratlocationSKT200 44IR_EYEFromiPodheaderinterface 45CHARGE_DISABLEToIC603viaMosfetM602 46ATMEL_/OE 47UART_UC_TO_KLEERKleerinterfacedata 54VOL_CLKToIC501/IC502volumecontrols 55VOL_DATToIC50
16、1/IC502volumecontrols 57IPOD_TO_UC_RS232iPodinterfaceData 58UC_TO_IPOD_RS232iPodinterfaceData 59UART_KLEER_TO_UCKleerinterfacedata 60HOST_SPI_DATA_INIC405anddebug 61AMP_SHDN*TopoweramppackagesIC504,IC504,IC506 62AMP_MUTE*TopoweramppackagesIC504,IC504,IC506 50USB_D+_UCUSBstickviaESDprotectionpackageI
17、C304 51USB_D_UCUSBstickviaESDprotectionpackageIC304 52+5V(USB)_STICK+5VUSBstickPSU RadioFans.CN Audioin/Videoout iPodaudiocanbeseenasIPOD_AUDO_LandIPOD_AUDIO_RthisisdriventhrutheNJM2114 opampatIC201(A/B)beforearrivingattheDG413analoguecmoschipatlocationIC200(A/B) thisswitchallowsfortheroutingofeithe
18、raudiofromadockediPodorfromtheexternalpath via3.5mmrearpanelstereojackatlocationSK202againcominginviaaNJN2114atlocation IC202(A/B)alsopresentonthispageistheYUVandCompositevideooutputsthesesignalsare deriveddirectlyfromthesourcedeviceandcanbeseenoncircuitas SVIDCCOMPY SVIDYCOMPPR CVBSCOMPPB Defaultou
19、tputisCompositewithYUVswitchedwhenan“Arcam”YUVcableisinsertedandthe senseonVID_CABLE_0andVID_CABLE_1aretriggered. KLEERandDSP AllaudiosignalsareroutedthrutheAnalogDevicesDSPchipatlocationIC400allowingfornot onlytheHigh/Lowpassfilteringofchannelsforthepowerampstagebutalsobespokeaudio manipulation,the
20、analogueaudiofromeitherdockediPodorAuxL+Rinappearingatpins 78/79aWolfsonWM8805runningformaref11.2896MhzclockisusedprimarilyforJitter reductionfortheKleerinputchipatLocationIC407itisimportanttonotethattheKleerChip isareceiverortransmittertheKleerchipisundercontrolofthemicroatpositionU301the receive/t
21、ransmitcircuitcanbeseenontheR.Fampcircuit.Datafortransmissionfroma dockedorexternalsourcecanbeseencomingfromtheDSPasSDATA_DSP_OUT.The E2PROMSatlocationsIC405andIC406areusedtostoretransmit/receivelockhistory. RFAMP Thinkofthisstageasatransceiveri.eitwillbothsendandreceiveinformationfromthe externalta
22、rgetthestageusestoggleswitchestoeffectiveswitchthebetweenthetransmitand receivestages. RadioFans.CN RFAMPcontinue TheRFstageisbothReceiveorTransmit(transceiver)allowingCubestobelinkedfordocked iPodsourceandexternalanalogueinputshenceyouwillseetwospatepathsthatareswitched R.FswitchesseenasIC701IC702I
23、C703twoseparateAntennaareusedandtherCubehasthe abilitytoselectthemoststableaerialatanygiventimetheaudiopathinto/outoftheKleer chipisseenasKL3012regardlessofstatuswheninreceivemodetheRFpowerampis bypassedbyIC701,IC702intransmissionmodebothswitchesaretoggledtobringtheSaw filterFL700andLowRFPassfilterF
24、L701withPowerAmpIC704backinline,Thetwoantenna areconnectedtothesurfacemountsocketsatSKT700anSKT701. DACFiltersandAmplifiers AudioarrivetheDACfiltersandAmplifierscircuitfromtheDSPas4separatechannelsthese beingTWEET_L/TWEET_R/WOOF_L/WOOF_Reachchanneltravelthruanidenticalfilter circuitTWEET_Lchannelwil
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