Cyrus CD T User manual

ENGINEERED TO ENTERTAIN


SERVICEMANUAL

17 59:57
SPECIFICATIONS

DigitaloutputCoaxialandOpticalSPDIF
Outputvoltage500mVpk‐pk
Outputimpedance75Ω
OpticaloutputToslink
Samplerateaccuracy44.1k±50ppm
Clockjitter<80ps
DisccompatibilityCDAudio,CD‐R
Dimensions(HxWxD)73x215x360(mm),2.8x8.4x14.1(inches)
Weight3.3kg

CYRUSCDt
CDPLAYER

SERVICECAUTIONS

©CyrusAudioLtdJun2014CyrusCDtServiceManualIssue1



ThesetwosymbolsshownaredisplayedprominentlyontheCDplayerbasecover
label.Theyindicatethatthefollowingcautionsmustbeobservedbyall
personnel‐
CAUTION:TOREDUCETHERISKOFELECTRICALSHOCK,DONOTREMOVECOVERORBACK.
THEREARENOUSERSERVICEABLEPARTSINSIDETHEPRODUCT.
ALWAYSREFERSERVICINGTOQUALIFIEDSERVICEPERSONNEL.

CAUTION!LIVEMAINSVOLTAGESONTHEMAINPCB!
WhenundertakinganyrepairworkontheCDplayer,engineersshouldnotethattheplayer
includesaswitchingpowersupplyconnecteddirectlytolivemainsandotherhighvoltages,
locatedonthemainPCBintheareahighlightedintheredbox.
Toavoidthedangerofelectricshock‐
Alwaysunplugmainspowerbeforeremovingthemain
PCB.
Neverconnectmainspowertothemainsinletormain
PCBifthemainPCBhasbeenremovedfromthe
chassis.
WhentracingsignalsanywhereonthemainPCB
exercisecautiontokeepfingers,toolsandtestprobes
etcawayfromthehighvoltagepowersupplysectionof
thePCB.
Neveruseagroundedtestprobetotestthehigh
voltage(primary)partofthepowersupply.
Ensurethatthechassisinsulatoriscorrectlyfitted
underthemainsPCBbeforerefittingitintothechassis. 





SERVICECAUTIONS

©CyrusAudioLtdJun2014CyrusCDtServiceManualIssue1
Thephotobelowshowsthepositionofcautionlabelsthatalerttheservicetechniciantothe
presenceofalaserdevice–

Onthebackpanel



Andonthediscloadingmechanism




SERVICEMANUALINDEX

©CyrusAudioLtdJun20141CDtServiceManualIssue1
INDEX
SMDcomponentreplacement.....................2
Typeidentification.......................................4
Blockdiagram..............................................5
Technicaldescription...................................6
Faultfinding/disassembly............................8
FlashSoftware...........................................11
MC‐BUSoperation.....................................12
Chassispartsdrawing/list..........................13
Frontpanelpartsdrawing/list...................15
MainPCBpartslist.....................................16
ServoPCBpartslist....................................21
Circuitdiagrams.........................................24

SMDCOMPONENTREPLACEMENT
©CyrusAudioLtdJun20142CDtServiceManualIssue1
Handling
SMDresistorsandcapacitorsarewidelyusedintheCyrusrangeofproducts.Whenhandling
SMDcomponents,certainprecautionsshouldbeobserved‐
HandlingSMDresistorsandcapacitors
AlwaysstoreSMDcomponentsintheiroriginalpackagingorinacooldryenvironment.
AlwayshandleSMDresistorsandcapacitorswithtweezersoravacuumpencil.
NeverhandleSMDresistorsandcapacitorswithfingers.
HoldtheSMDcomponentbythebody,notbytheends.
DonotuseSMDresistorsorcapacitorsiftheendsaredirtyordiscoloured.
DonotuseSMDresistorsorcapacitorsiftheyhavebeendroppedonthefloor‐ theymay
beinternallydamaged.
Alwaysusereplacementcomponentsofthecorrectsizeandshape.SMDcomponentsare
availableinmanydifferentpackages.Wherepossible,orderoriginalpartsfromCyrus.
HandlingSMDICs
Alwaysstorethesecomponentsintheiroriginalpackagingorinacooldryenvironment.
AlwayshandleSMDtransistorsandICswithtweezersoravacuumpencil.
NeverhandleSMDtransistorsandICswithfingers.
Ensurethattheconnectionpinsoflargermulti‐pinICsarenotdeformedordamaged
beforefitting.
MeasuringcircuitswithSMDcapacitorsandresistors
Avoidusingsharp,pointedprobesdirectlyonthecomponentendcaps.
MeasurevoltagesfromthePCBpadnexttothecomponent.
Staticprecautions
SMDcomponents,particularlyICs,maybedamagedbythestaticlevelspresentinthe
workshop.Damagecausedbystaticmaynotimmediatelycausecomponentfailurebutcould
causepartialdamageandapossiblefailureinthefuture.ObservingthesesimpleSMD
precautionswillavoidproductfailuresrelatedtostaticdamage‐
Alwayswearagroundedwristbandwhenreplacinganyelectroniccomponents.
Alwaysstorecomponentsintheiroriginalpackagingorconductiveplasticbags.
Neverstorecomponentsinplastictraysorbagswithoutprotection.
Soldering/desolderingSMDcomponents
Neverre‐useoldSMDcomponentsafterde‐soldering!
Alwaysapplysolderheatdirectlytothecontactarea.Avoidover‐heatingadjacent
components.
AlwaysrepairSMDPCBswiththecorrecttools.SMDcomponentscanonlybereplacedwith
ahotairpencilorsolderingirondesignedforSMDcomponents,preferablywith
temperaturecontrol.
Keepthesolderingtemperatureaslowaspossible.370ºCisrecommendedforLeadfree
SMDrework.MostSMDcomponentswillwithstand370ºCfor5to10seconds

SMDCOMPONENTREPLACEMENT
©CyrusAudioLtdJun20143CDtServiceManualIssue1
Whenusingsolderpasteapressuredispensershouldbeusedtoensurethecorrectamount
ofsolderisappliedtoeachpad.
Solderpasteshouldnotbeusedwithdirectheatingmethodsasthesolderbetween
componentpinsmaynotbemelted.
Ifnecessary,removeexcesssolderpastewithsolderbraid.
RemovingSMDresistorsandcapacitorsfromthePCBwithasolderingiron
1.Fitthesolderingironwithatiplargeenoughtobridgebothendsofthecomponent.
2.Placethesolderingironsothatitsflattipwillheatbothendsofthecomponentatonce.
3.Whenthesoldermelts,removethecomponentwithtweezers.
4.AllowthePCBtocoolforafewminutes,removinganyexcesssolderwithdesoldering
braid.
FittingreplacementSMDresistorsandcapacitorstothePCBwithasolderingiron
1.Applyalittlefluxtotheconnections.
2.Placethecomponentinposition.
3.Tinthesolderingiron,bringthetipintocontactwiththePCBpadandflowsoldertothe
joint.Avoidbringingthesolderingirontipdirectlyintocontactwiththecomponent.
RemovingSMDICsfromthePCB
1.Usingfinetippedsidecuttersortweezercutters,snipalltheleadsofthedeviceand
removetheICbody.
2.DesoldertheleadsfromthePCBpads.
3.CleanupthePCBwithsolderbraid.
RemovingSMDICswithahotairSMDtool
1.FitasuitablesizetipfortheICbeingremoved.
2.HeattheICevenlyuntilthesoldermelts.
3.RemovetheICwithtweezers.
FittingreplacementICstothePCBwithasolderingiron
1.CheckthatthepinsoftheICarenotdistorted.
2.Usingtweezers,positiontheICoverthefootprint.
3.CheckthatalltheICpinsarecorrectlyalignedwiththepads.
4.Withaveryfinetipsolderingiron,solderinthepinsatthecornersoftheIC.
5.Re‐checkthealignmentandcorrectifnecessary.
6.WhenthealignmentisOK,soldertheremainingpinsoftheICtothePCB.


TYPEIDENTIFICATION
©CyrusAudioLtdJun20144CDtServiceManualIssue1
Ratinglabel
TheCDtcarriesaratinglabelontherearpanel,whichincludesdetailsoftheratedpower
supplyvoltage.
Nominalpowervoltage
Thiswillbeeither220‐230VForuseonnominal220V‐240VACmainssupply.
Powerconsumption
Themaximumpowerconsumptionfigureisindicated.
Serialnumber
EachCDplayercarriesaserialnumbercode,whichidentifiesthefollowing‐
Typeofproduct
Marketdestination
Buildnumber
Paintfinish(colour)
Theserialnumberisonthebaseplate.Itisthereforeimportanttoensurethatabaseplate
removedfromaproductisre‐fittedtothesameproduct.InanycommunicationswithCyrus
ServiceorQualitydepartmentsitisessentialthatthefullserialnumberisquotedsothat
originalspecificationpartsandserviceinformationmaybesupplied.
PCBIdentification
EachPCBismarkedwithadesignrevisionnumberandthisnumbershouldbequotedinall
correspondencetotheservicedepartmentwhenrequestingtechnicaladviceorrequesting
spareparts.ThetablebelowshowsatypicalPCBmarking.

RevisionnumberPCBmarking
Mainboardrevision1IS2112N1

BLOCKDIAGRAM
©CyrusAudioLtdJun20145CDtServiceManualIssue1

SPDIF
uController
IC601
LCD
IR Keys
IC701
MC BUS
OPTICAL
Main PCB
RAD
FOC
MOT
SLED
BA5984FP
SAA7826
Servo PCB
LOAD/ UNLOAD
IC401
IC604
COAXIAL
IC402
74HCT86 74HCT14
LPC1752FBD80

TECHNICALDESCRIPTION
©CyrusAudioLtdJun20146CDtServiceManualIssue1
PCBassemblies
ThefollowingisabriefdescriptionoftheinternalPCBsfoundintheCDt.
TheservoPCBismounteddirectlyontotheCDmechanism,thisincludestheCDloadermotor
andsleddrivers,theservodriverandCDdecoder.
ThemainPCBismountedinthebaseofthechassisandcontainsthepowersupplies,optical
andcoaxialSPDIFoutputandtheuserinterfacemicrocontroller.

Discreading/decodermoduleandservoPCB
Thediscreadinglaserpickupismountedinamotordrivenslotloader,whichreceivesits
operatingcommandsviatheservoPCB.

TheheartoftheservoPCBistheCDdecoderIntegratedCircuitIC401.Thisiscontrolledby
softwarerunningonthemainboardmicrocontrollerIC701viaanI2CBus.
Themicrocontrollersendshighlevelcommands(e.g.ReadTOC,Playtrack1)totheservoPCB
viaacommunicationbus.DiscloadingiscontrolledbythemicrocontrollerontheservoPCB.

WhenadiscisinsertedintotheplayerthefirstthingthatneedstohappenisthattheTableof
Contents(TOC)ofthediscisread.Thisinformationcontainsthestartandendlocationofeach
trackonthediscfordiscnavigationpurposes.

InordertoreadtheTOCthelaserisswitchedonbythedecoderIC,andafocusrampis
initiated.Iffocusisfoundthenthediscmotorisswitchedonforashorttime,thenthePLLis
switchedonandthediscisacceleratedtofullspeed.Oncethespeedhadbeenachievedand
thePLLislockedontothedata,theradialloopisswitchedonandthesubcodewillberead
fromthediscandfedtothedecoder.

Thefocusandradialpositionsofthelaserspotarecontrolledbythedecoderbylookingatthe
diodesignalscomingfromtheopticalpickup(OPU).TheseareD1,D2,D3andD4forfocus,R1
andR2forradial.TheerrorsignalfromthesediodesisusedtogenerateaPDMsignal.This
signalisthenfilteredwithalowpassfilterandamplifiedbythemotordriver(BA5984FP)to
movetheactuators.

PowerforthelaserdiodeissupplieddirectlyfromthedecoderICwhichmonitorslaseroutput
andadjuststhepoweraccordingly.

Thereisasinglesystemclockontheservoboard,8.4672MHz.Thisisself‐generatedbythe
decoderIC.

Thereare2mainpowersuppliestotheservoboard,+5V_CDforthesignalprocessing
electronicsand+5V_MOTORtoIC402supplyingmotorandsledpower.The+5V_CDsupplyis
subregulatedto+3V3andsub‐sub‐regulatedto+1.8Von‐boardforthedecoderandother
electronics.


TECHNICALDESCRIPTION
©CyrusAudioLtdJun20147CDtServiceManualIssue1
Microprocessorcontrolsystem
SystemcontrolisprovidedbymicrocontrollerIC701onthemainPCB.Themicrocontroller
acceptsexternalusercommands(IRhandset,frontpanelkeysandMC‐BUSloop)and
translatesthemintoinstructionsthatoperatetheCDmechanism,viacommandssenttothe
servoPCB.
ThemicrocontrollercommunicateswiththedecoderontheservoPCBviatheCD_CLand
CD_DAlines.
DigitalOutputs
ThedigitalaudiodatafromtheservoPCBisfedtothemainPCBviacableassemblyCON701.
ThedataisthenbufferedbyIC601andIC604.TheSPDIFdataisfedtotheopticaloutput
(TOTX401)andtotheRCAcoaxialoutput(viadigitaltransformerL402).

Powersupplies
TheinternalregulatedpowersuppliesfortheCDtarederivedfromaswitchingpowersupply
onthemainPCB.Thishastwoseparateoutputs,+5Vand+10V.
The10VsupplydrivesthedisplaybacklightviaaswitchablecurrentsourceT702/T706/T707.
The5Vsupplydrivestheotherpartsofthecircuit.

Frontpaneldisplay
ThefrontpaneldisplayisabacklitLCDmodulemountedinamouldingbehindthefrontpanel.
TheLCDmoduleisdrivenbysignalsfrommicrocontrollerIC701pins37and38(DISP_DATAand
DISP_SCLK).IC701alsoreadsbackananaloguevoltageencodedfromkeyspressedonthefront
panel(viaKEYS_IN1pin7),andremotecontrolinformationfromtheeyevialineRC5_INpin
32.
