Service Manual AV321T Service Manual

AV321T

servicemanual

Catalog

ChapterOneAboutMaintenance

1.1Safetyprecautions

1.1.1Powersupply

1.1.2Precautionsforantistatic

1.1.3Aboutplacementposition

1.2Maintenancemethod

1.2.1Visualizedmethod

1.2.2Electricresistancemethod

1.2.3Voltagemethod

1.2.4Currentmethod

1.2.5Cuttingmethod

1.2.6Elementsubstitutionmethod

1.2.7Comparisonmethod

1.3Requireddeviceformaintenance

1
1
1
1
2
2
2
2
2
2
2
3
3
3

ChapterTwoFunctionsandOperationInstructions

2.1FEATURES

2.2ControlbuttonlocationsandExplanations

2.2.1Frontpanelfunctionsandillustrations

2.2.2VFDDISPLAY

2.2.3REARPANELILLUSTRATIONS

2.2.4REARPANELILLUSTRATIONS

2.3BASICOPERATIONS

2.3.1TurnOn/OfftheUnit

2.3.2Mute

2.3.3SelectInputSoundSourceandVideoSource

2.3.4SelectDecodeMode

2.3.5AdjustVolume

2.3.6AdjustChannelLevel

2.3.7AdjustMainChannelTone

4
4
4
4
5
5
6
7
7
7
7
8
8
9
9

2.3.8SelectEQMode

9

2.3.9DEFAULT

2.3.10Karaoke

2.3.11Tuning

2.3.12Tuning(Continued)

2.3.13ChannelDelay

2.3.14NoiseTesting

2.3.15SelectSpeakerMode

2.3.16Headphone

2.4ACCESSORIES

2.5SPECIFICATIONS

ChapterThreeUnitCircuitPrinciple

SectionOnePrincipleoftheplayer

3.1.1Compositionoftheplayer

3.1.2Functionandfeatures

9
9
10
11
12
12
12
12
13
13

14
14
14
14

3.1.3Blockdiagramoftheplayer

3.1.4Signalflowchartoftheplayer

SectionTwoUnitCircuitPrinciple

3.2.1Signalprocessingboard

3.2.2Decodeboard

3.2.3Controlpanel

3.2.4Powerboard

3.2.5Poweramplifierboardandprotectioncircuit

3.2.6Videoinput/outputboard

3.2.7MIC,headphoneboard

SectionThreeServicingCases

3.3.1Servicingcases

3.3.2Troubleshootingflowchart

SectionFourServicingParameter

3.4.1Signalwaveformdiagram

15
16
17
17
18
19
20
21
24
24
26
26
32
37
37

3.4.2Keypointvoltage

SectionFiveFunctionIntroductiontoIC

3.5.1functionintroductionto4558

3.5.2functionintroductiontoPt2399

47
48
48
49

3.5.3functionintroductiontoCd4051

50

3.5.4functionintroductiontoCd4052

3.5.5functionintroductiontoCd4053

3.5.6functionintroductiontoPt6311

3.5.7functionintroductiontoUTCLM4880

3.5.8functionintroductionto74HC04

3.5.9functionintroductiontoLm1875

3.5.10functionintroductiontoTDA2052

3.5.11functionintroductiontoM62446

3.5.12functionintroductiontoAT24C02

3.5.13functionintroductiontoL7805

3.5.14functionintroductionto7812

3.5.15functionintroductionto7912

3.5.16functionintroductiontoNe5532

3.5.17functionintroductiontoPt2315

3.5.18functionintroductiontoCs4360

51
52
53
56
56
57
58
59
61
62
62
63
63
64
66

3.5.19functionintroductiontoCd4094

3.5.20functionintroductiontoCs5340

3.5.21functionintroductiontoCs8415

3.5.22functionintroductiontoCs49326

ChapterFourDisassemblyandAssemblyProcess

ChapterCinquePCBboard&Circuitdiagram
SectionOnePCB
BoardSectionTwocircuitdiagram

ChaptersixBOMList

6.1SIGNALDISPOSALBOARD

6.2SIGNALDISPOSALBOARDAISEGMENT

6.3DECODEBOARD

67
68
70
71

74

75
75
83

93
93
93
96

6.4DECODEBOARD-SMD

6.5AMPLIFIERBOARD

6.6SURFACECONTROLBOARD

6.7POWERBOARD

96
98
101
102

6.8MICROPHONEHOLDERBOARD

104

6.9VIDEOFREQUENCYBOARD

6.10REMOTECONEROLLER

6.11PANELUNIT

6.12PROGRAMCPU

6.13SNLABEL

6.14SUPPLEMENTMODULE

104
105
106
106
106
107

ChapterOneAboutMaintenance

1.1Safetyprecautions

1.1.1Powersupply

Whenservicingaudiopoweramplifier,theservicingpersonnelpayspecialattentiontothepower
boardwith220VAC,orelsetheimproperoperationwillleadtobodydamage.Thealternatecurrent
whichoutputstopoweramplifierboardthroughpowerboardisalsouptovoltagewithabout50V;when
servicing,short-circuitandjointweldingcannotoccur,orelsetheelementswillbeburntoutandtrouble
rangewillbeenlarged.

1.1.2Precautionsforantistatic

Movementandfrictionwillbothbringstaticelectricitywhichcausesseriousdamagestointegrated
IC.Thoughstaticchargeislittle,whenalimitedquantityofelectricchargeisaddedtolarge­scaleintegratedIC,asthecapacitanceisverysmallinthemeantime,nowtheintegratedICisverymuch
easytobestruckthroughbystaticelectricityortheperformancewilldecrease.Thusstaticelectricity
preventionisofextraordinaryimportance.Thefollowingareseveralmeasurestopreventstatic
electricity:

1.Useapieceofelectricconductionmetalwiththelengthofabout2metrestoinsertintotheearth,
andFetchtheleadwirefromthetopofthesurplusmetalandconnecttotherequiredstaticelectricity
device.Thelengthanddepthofthemetalembeddedundertheearthshouldbedeterminedaccordingto
thewettabilityofthelocalsoil.Forhumidplaces,itmaybeshorter,andlongeranddeeperfordryplaces.
Ifpossible,itcanbedistributedandlayedintermsof“#”shape.

2.Onoperatingtable-board,theantistatictablecushionshouldbecoveredandgrounded.

3.Alldevicesandequipmentsshouldbeplacedontheantistatictablecushionandgrounded.

4.Maintenancepersonnelshouldwearantistaticwristringwhichshouldbegrounded.

5.Placesaroundtheoperatingpositionshouldalsobecoveredwithelectricconductioncushionor
Paintedwithantistaticpaint.

-1-

1.1.3Aboutplacementposition

1.

Audiopoweramplifiercannotbeinstalledinplaceswithhightemperatureandhumidity.

2.Positionsforplacementshouldbestableandsecure.

1.2Maintenancemethod

1.2.1Visualizedmethod

Directlyviewwhetherabnormalitiesofcollision,lackofelement,jointwelding,sheddingwelding,
rosinjoint,copperfoilturningup,leadwiredisconnectionandelementsburningupamongpinsof
elementsappear.Checkpowersupplyofthemachineandthenusehandstotouchthecasingofpartof
elementsandcheckwhethertheyarehottojudgethetroublespot.Youshouldpaymoreattentionwhen
usingthismethodtocheckinhighvoltageparts.

1.2.2Electricresistancemethod

Setthemultimeterinresistancepositionandtestwhetherthenumericalvalueofresistanceofeach
pointinthecircuithasdifferencefromthenormalvaluetojudgethetroublespot.Butinthecircuitthe
testednumericalvalueofresistanceisnotaccurate,andthetestednumericalvalueofintegratedIC's
pinscanonlybeusedforreference,sotheelementsshouldbebrokendownfortest.

1.2.3Voltagemethod

Voltagemethodisrelativelyconvenient,quickandaccurate.Setthemultimeterinvoltageposition
andtestpowersupplyvoltageoftheplayerandvoltageofacertainpointtojudgethetroublespot
accordingtothetestedvoltagevariation.

1.2.4Currentmethod

Setthemultimeterincurrentpositionandtestcurrentoftheplayerofacertainpointtojudgethe
troublespot.Butwhentestingincurrentmethod,themultimetershouldbeseriesconnectedinthe
circuit,whichmakesthismethodtootrivialandtroublesome,soitislessfrequentlyusedinreality.

1.2.5Cuttingmethod

Cuttingmethodshouldbecombinedwithelectricresistancemethodandvoltagemethodtouse.
Thismethodismainlyusedinphenomenaofshortcircuitandcurrentleakageofthecircuit.When
cuttingtheinputterminalvoltageofacertainlevel,ifvoltageoftheplayerrisesagain,itmeansthatthe
troubleliesinthislevel.

-2-

1.2.6Elementsubstitutionmethod

Whensomeelementscannotbejudgedgoodorbad,substitutionmethodmaydeadopteddirectly.

1.2.7Comparisonmethod

AsamegoodPCboardisusuallyusedtotestthecorrectvoltageandwaveform.Comparedthese
datawiththosetestedthroughfaultPCboard,thecauseoftroublesmaybefound.

Throughtheabovemaintenancemethod,theoreticalknowledgeandmaintenanceexperience,all
difficultiesandtroubleswillbereadilysolved.

1.3Requireddeviceformaintenance

AudioGenerator

◆

Digitaloscillograph(100MHE)

◆≥

SMDreworkstation

◆

Multimeter

◆

Solderingiron

◆

Pointed-monthpincers

◆

Cuttingnippers

◆

Forceps

◆

Electricscrewdriver

◆

Terminalsconnectingcord

◆

Headphone

◆

Microphone

◆

-3-

ChapterTwo

FunctionsandOperationInstructions

2.1FEATURES

◆

2-waycoaxialdigitalsignalinput,1-wayopticaldigitalsignalinput

◆

With5.1CHinputterminal,capableofconnectingwithexternalmulti-channeladvanceddecode
outputsignalssuchasDOLBYDIGITAL,DTS

◆

Withsubwooferoutputterminal,capableofconnectingwithactivesubwooferspeaker

◆

Built-inFM/AMtuner

◆

Withheadphoneoutputjack

◆

6CHdigitalvolumecontrol

◆

Separateleveladjustmenttoleft,right,centre,surroundandsubwooferchannel

◆

DolbyDigital,DTS,DolbyProLogicII,DSP,STEREOdecode

◆

Automaticallyrecognizeinputsignalformatandselectthecorrespondingdecodemode

◆

Decodemodemanualselection

◆

Mainchannelhigh/lowtoneadjustment

◆

VideoandS-Videoselectedfunction

◆

Centre,surrounddelayadjustmen

◆

Noisetesting

◆

5presetEQmodes

◆

Digitaltuningfunction

◆

Capableofstoring36FMand12AMradiostations

◆

Automatically/Manuallysearchingradiostations

◆

Automuteifthereisnosignal

◆

High-performancedigitalKaraoke,withMICvolume,toneandechoadjustment

◆

Separate5CHpoweramplification

◆

Speciallyautomaticprotectionofshort-circuit,over-voltageandover-current

◆

Fullremotecontroloperation

t

◆

Completeunitinterface

-4-

REARPANELILLUSTRATIONS

2.2ControlbuttonLocationsandExpLanations

2.2.1Frontpanelfunctionsandillustrations

６

HOMETHEATRERECEIVERAV311T

MUTE

SL

１ ２ ４ ５３

1

POWERswitch
Switchon/offtheACpoweroftheunit

2

MENUbutton
MENUbutton,pleaserefertotherelated
chaptersfordetails

3

Multi-FunctionKnob
Innormalworkingmode,synchronously
adjust6-channellevel.Inaddition,by
usingthisknobandMENUbutton,you
mayfulfilmultiplefunctions.Pleaserefer
totherelatedchaptersfordetails...

PRESET

TUNER

STERO

MP3

RCL

SR

SLEEP

SOUNDFIELD

STEREO

STADIUM

DIGITAL

OPTICAL

STAGE

CH HALL

KHZ

DISCO

MHZ

LIVE

４

Headphonejack

5

MICjack

6

IRsensorwindow
Receivetheremotecontrolsignals.

2.2.2VFDDISPLAY

３ １１

１６

８５ ７６ ９ １０

１３１４ １２１５

-5-

1

MUTEsymbol

2

DTSdecodemodesymbol

3

DolbyDigitaldecodemodesymbol

4

DolbyProLogicdecodemodesymbol

5

TUNERsymbol,itsflickershowsthetuneris

Ⅱ

insignalsearchingstate

6

Callthepresetsavedradiostation,orhas
savedthecurrentlytuningchannel

7

Thetunerhasreceivedsignal
Stereodecodemodeorthecurrently

8

receivedFMradiostationisstereooutput
signal

2.2.3REARPANELILLUSTRATIONS

9

DSPdecodemodesymbol

１０

InDSPdecodemode,stimulateSTADIUM
soundfield

11

InDSPdecodemode,stimulateSTAGE
soundfield

12

InDSPdecodemode,stimulateHALLsound
field

13

InDSPdecodemode,stimulateDISCO
soundfield

14

InDSPdecodemode,stimulateLIVEsound
field

15

Connectchannel,dataformatdisplayarea

16

Effectivechanneldisplayarea

８

７

1

1

DIGITAL

VCD

VCD

VCDDVD DVDOUT OUT

Coaxialdigitalsoundsourceinputjack1,2;

opticaldigitalsoundsourceinputjack

2

AM/FMantennaterminal

ConnectAM/FMantennaoutside

3

S-VIDEO

VCDDVDS-VideoSelectedJacks

、

4

STEREO

VCDDVDstereoaudiosignalinputjack

、

5

5.1CH

5.1CHaudiosignalinputjack

6

VIDEO

VCDDVDVideoSelectedJacks

、

１０

7

LINEOUT

９

Subwoofersignallineoutputjack

8

Data
Modeldataplate

9

Speakerjack
Connectwithspeakerterminals

10

CAUTIONmark
Remindtheuserofdangerousvoltage
Inside

11

Dualsquaresymbol
ClassIIelectricshockprotectionproduct

１１

-6-

2.2.4ILLUSTRATIONSTOTHEREMOTECONTROL

1

STANDBYbutton:Enterorexitstandbystate

2

SOUND/VIDEOSOURCEbutton:Selectinput
signalsourcesmanually

3

NUMBERbuttons:Forsavingandcallingsaved
radiostations

4

AMSTEPbutton:Pressingthisbuttonforlong
(above3seconds)mayswitchstepvalus9KHz
or10KHzintheAMwaveband

5

FORWARD/AFTERWARDbutton:Callthe
savedradiostationsforward/backward

6

DEFAULTbutton:Pressthisbuttonforlong
(above3seconds),theunitautomatically
restoressystemparametertodefaultvalue

7

MULTI-FUNCTIONbuttons

8

CHANNELbuttons:Usingwithmulti-function
buttonsmayseparatelyadjust channelleve

9

STEREOMODEbuttonl

10

DOLBYPROLOGICDECODEMODEbutton

11

DTSDECODEMODEbutton

12

DOLBYDIGITALDECODEMODEbutton

13

SPEAKERMODESETUPbutton:Pressingthis
buttonmaycircularlyselectmainspeakermode
andsubwooferon/offmode

14

EQMODEbutton:Pressthisbuttonto
circularlyselectEQmode

15

KARAOKEECHO(+,-)button:AdjustKaraoke
echo

16

KARAOKETREBLE(+,-)button:Adjust
Karaoketreble

17

KARAOKEBASS(+,-)button:AdjustKaraoke
bass

18

KARAOKEVOLUME()button:Adjust
Karaokevolume

19

MAINCHANNELTREBLE(+,-)button:Adjust
mainchanneltreble

20

MAINCHANNELBASS(+,-)button:Adjust
mainchannelbass

21

DSPDECODEMODEbutton

22

MAINVOLUMEbutton:Capableof
synchronouslyadjusting6-channelvolume

23

DELAYbutton:Usingwithmulti-function
adjustmentbuttonsmayadjustcentre,surround
channeldelay

24

FMSTEREOMODEbutton:Manually/
automaticallyselectFMstereomode

25

WAVEBANDbutton:UsedtoswitchFM/AM
waveband

ＴＵＮＥＲ

ＭＥＭ

ＲＣ

ＴＲＥＢＬＥ

ＭＵＴＥ

ＴＥＳＴ

５．１ＣＨ

ＢＡＮＤ

ＭＯＤＥ

ＤＥＬＡＹ

ＶＯＬ

ＢＡＳＳ

ＭＩＣＶＯＬ

ＳＴＡＮＤＢＹ

１

ＯＰＴＩＣＡＬ

２

３

４

５ ５

６６

７

８

９

１０
１１

１２
１３
１４

１５

１６

26

MEMORYbutton:Savetuningstations

27

NOISETESTINGbutton

28

MUTEbutton

ＣＯＡＸ．１ ＣＯＡＸ．２

ＤＶＤ

ＶＣＤ

９ ０

ＳＴＥＰ

ＤＥＦＡＵＬＴ

Ｌ

ＳＬ ＳＷ ＳＲ

ＳＴＥＲＥＯ ＤＳＰＰＬⅡ

ＤＩＧＩＴＡＬ

ＤＴＳ

ＥＱＭＯＤＥ

ＳＰＫ．

ＥＣＨＯ ＴＲＥＢＬＥ ＢＡＳＳ

ＫＡＲＡＯＫＥ

RC-311

２８

２７

２６
２５

７

２４

２３

２２

２１

２０

１９

１８

１７

Ⅱ

、

-7-

2.3BASICOPERATIONS

2.3.1TurnOn/OfftheUnit

1.PowerOn

◆

Beforepoweron,pleasecheckwhetherthe

poweraccordswiththemarkedspecsofthe
unit,whetherthepowersocketaccords
withthepowerplugoftheunitandwhether
thesoundsourceconnectioncords,output
cordsarecorrectlyconnected.Thenyoumay
connectthepower;

◆

PressPOWERswitchonthefrontpanelofthe

unitandtheindicatorlightonthepanelflickers
Theunitautomaticallyconnectwiththeinput
soundsourcebeforepower-offlasttime,and
automaticallyselectdecodemodeaccording
totheinputsoundsourceformat.

2.Standby

◆

Iftheuserwantstofinishingoperatingina

shorttime,youmaypressSTANDBYbutton
ontheremotecontroltoenterstandbystate.If
youwanttooperateitagain,pressSTANDBY
buttonagaintoexitstandbystate.

3.PowerOff

◆

Ifnotgoingtouseforalongperiod,press

POWERswitchonthefrontpaneltoturnoff
thepower,andtheindicatorlightturnsout.

theVFDscreenislightened.Inmutestate,
pressMUTEbuttonontheremotecontrol,the
unitrestorestooutputsoundandthe"MUTE"
symbolturnsout.UsingtheMULTIFUNCTION
knobonthefrontpanelorpressingMAIN
VOLUMEbuttonontheremotecontrolmay
alsocancelmute.

MUTE

SL

VCD

SOUNDFIELD

STEREO

PRESET

TUNER

STERO

STADIUM

MP3

DIGITAL

OPTICAL

SLEEP

RCL

SR

STAGE

CH

HALL

DISCO

KHZ

MHZ

LIVE

MUTE

Mute

MUTE

SL

VCD

SOUNDFIELD

STEREO

PRESET

TUNER

STERO

STADIUM

DIGITAL

OPTICAL

MP3

SLEEP

RCL

SR

STAGE

CH HALL

KHZ

DISCO

MHZ

LIVE

STANDBY

TurnOn/Off

theUnit

2.3.2Mute

◆Innormalworkingstate,pressMUTEbutton

ontheremotecontrol,

"MUTE"symbolonthetopleftcornerof

theunitissilentandthe

2.3.3SelectInputSoundSourceand
VideoSource

◆Thisunithas1-wayopticalinputterminal,2­waycoaxialinputterminal,1-wayVCDinput
terminal,1-wayDVDinputterminaland5.1CH
inputterminal.Youmayusetheremotecontrol
todirectlyselectinputsoundsource,oruse
MENUbuttonandMULTI-FUNCTIONknobon
thefrontpaneltoselectinputsoundsource
throughmenu.Youarerecommendedtouse
remotecontrolmeans.

RemoteControlMeans

◆PresstheSOUNDSOURCEbuttononthe
remotecontroltoseparatelyselectthesound
sourceofoptical,coaxial1,coaxial2,VCDand
DVDastheworkingsoundsourceofthisunit.
PressTUNERbuttontoselectthebuilt-ituner
ofthisunitastheworkingsoundsource.

MenuMeans

◆PressMENUbuttononthefrontpanelofthe
unitandVFDscreendisplays"SOURCE".

-8-

◆

RotatetheMULTI-FUNCTIONknob,VFD

screenwilldisplay"OPTICAL","COAX1",
"COAX2","DVD","VCD","EXT5.1CH",
"AM"and"FM"symbolswhichrespectively
standsforthesoundsourcesonoptical,
coaxial1,coaxial2,DVD,VCDandexternal

5.1CHterminals,andthebuilt-inAM,FMwave
bandsignals.PressMULTI-FUNCTIONknob
toselectthissoundsource.

Selectvideo

◆

WhenTunerin,Novideoout;WhenVCDAudio

in,theVCDvideoisselected;WhenDVD

、、

audio5.1CHCOAXIALandOpticalin,The
DVDvideoisselected.

SOUNDFIELD

STEREO

PRESET

TUNER

STERO

STADIUM

DIGITAL

OPTICAL

MP3

SLEEP

RCL

SR

STAGE

CH HALL

KHZ

DISCO

MHZ

LIVE

SelectSource

OPTICAL

COAX.1 COAX.2

MUTE

SL

VCD

5.1CHTUNERDVDVCD

Inputchannel PLII

Analog

Signal

Digital
Signal
(from

2/0AC-3 Yes Yes Yes No No

Optical,
Coax1,

Coax2)

Stero

DVD

Yes Yes No No Yes Stereo
VCD Yes Yes No No Yes Stereo
PCM Yes Yes No No Yes Stereo

AC-3 Yes No Yes No No
DTS Yes No No Yes No DTS

NOTE:InDolbyProLogicdecodemode,itis

Dolby
Digital

Ⅱ

DTS DSP

Default
Decode

Dolby
Digital

Dolby
Digital

effectiveonlywhensamplingrateless
than96KHz.

ThisunitcanonlyreceivePCMsignalswith
samplingratelessthan96KHz.Therearetwo
meansofmanuallyselectingdecodemode:
Remotecontrolandmenu.

RemoteControlMeans

PressSTEREO,II,DSP,DTS,DIGITAL

◆

buttonsontheremotecontrol,ifthedecode

modethatyouselectedcannotberealizedto

inputsignal,thesystemstillremainsthe

Originaldecodemode.

MenuMeans

PressMENUbuttononthefrontpanel

◆

continuouslyuntilDECODEappears.Rotate

theMULTI-FUNCTIONknob,andVFDscreen

willdisplay"STEREO,DSP,DOLBY,PROII,

DolbyDigital,DTS",whichstandsforSTEREO,

DSP,DolbyProLogicII,DolbyDigitalandDTS

decodemoderespectively.Youneedtopress

theMULTI-FUNCTIONknobtoconfirmto

enternewdecodemode.
Note:Asforacertaininputchannel,ifsome

decodemodesdonotexist,theoperation

isinvalid.

2.3.4SelectDecodeMode

◆ThisunithasDolbyDigital,DolbyProII,DTS,
DSPandSTEREOdecodemodes,butnot
everyinputchannelhasallthedecodemodes.
Whentheuserswitchestheinputchannelor
changestheinputsignalformat,theunitmay
automaticallyselectthedefaultdecodemode
accordingtotheinputsignalformat.Certainly,
theusermayalsoselectthedecodemode
manually,andpleaserefertothefollowing
tablefortheselecteddecodemodeofeach
channelandthedefaultdecodemode.
Table1:Relationbetweeninputchanneland
decodemode

-9-

HOMETHEATRERECEIVERAV311T

MUTE

SOUNDFIELD

STEREO

PRESET

TUNER

STERO

STADIUM

DIGITAL

MP3

OPTICAL

SLEEP

STAGE

RCL

CH HALL

KHZ

SL

DISCO

SR

MHZ

LIVE

SelectDecodeMode

2.3.5AdjustVolume

◆RotatingtheMULTI-FUNCTIONknobonthe

frontpanelorpressingtheMAINVOLUME
buttonontheremotecontrolmay
synchronouslyadjust6-channellevelandthe
screendisplays"VOLXX"adjustmentrange
0~60.

Note:Themainvolumeautomaticallysetsin20

eachtimewhenpoweron.

AdjustChannelLevel

HOMETHEATRERECEIVERAV311T

MUTE

SL

SOUNDFIELD

STEREO

PRESET

TUNER

STERO

STADIUM

MP3

DIGITAL

OPTICAL

SLEEP

MASTER

VOL

STAGE

CH

HALL

KHZ

DISCO

MHZ

LIVE

RCL

SR

AdjustVolume

2.3.6AdjustChannelLevel

◆◆PressCHANNELbuttonontheremotecontrol

andtheVFDscreendisplaysthe
correspondingchannelsymbol:"FLXXX,FR
XXX,FCXXX,SLXXX,SRXXX,SWXXX",
whichmeansleftchannel,rightchannel,
centrechannel,surroundleftchannel,right
surroundchannelandsubwooferchannel
respectively.

PresstheMULTI-FUNCTIONadjustment

buttonontheremotecontroltoadjustchannel
level.Theadjustmentrangeofchannellevelis

-60~+60

Figure:Thedesignofchannellevelonthescreen

2.3.7AdjustMainChannelTone

◆PressTREBLEandBASSbuttonofmain
channelontheremotecontroltoadjustthe
mainchanneltrebleandbass
respectively.

TREBLE BASS

AdjustMainChannelTone

2.3.8SelectEQMode

◆PressingEQbuttonontheremotecontrolmay
selectFLAT,DISCO,POP,ROCKandJAZZ
moderespectively.Figure:EQmodedisplay

-10-

EQMODE

SelectEQMode

2.3.9DEFAULT

PressDEFAULTbuttonforlong(above3
seconds),andtheunitrestoresthechannel
levelandKaraokevolumeparameterstodefault
Parameters.

1.Karaokevolume
TherearetwomeanstoadjustKaraoke

◆

volume:remotecontrolandmenu.
RemoteControlMeans

PressKARAOKEVOLUMEbuttononthe

Remotecontrol

MenuMeans

PressMENUbuttononthefrontpaneluntil
MICVOLappears,andthenrotatetheMULTI­FUNCTIONknob.

MICVOL

DEFAULT

Calldefaultparameter

2.3.10Karaoke

InsertthemicrophoneintotheMICjackon
thefrontpanelandpushtheMICswitchtoON(if
thereisswitch).Keepanappropriatedistance
Withspeakertoavoidwhistle.

HOMETHEATRERECEIVERAV311T

MUTE

SL

SOUNDFIELD

STEREO

PRESET

TUNER

STERO

STADIUM

DIGITAL

OPTICAL

MP3

SLEEP

RCL

SR

STAGE

CH HALL

DISCO

KHZ

LIVE

MHZ

Karaokevolume

2.Karaokeecho
TherearetwomeanstoadjustKaraokeecho:

◆

remotecontrolandmenu.
RemoteControlMeans

PressKARAOKEECHObuttonontheremote

control.

MenuMeans

PressMENUbuttononthefrontpaneluntil
MICECHOappears,andthenrotatetheMULTI­FUNCTIONknob.

ECHO

2

MenuandMICjack

1

Karaokeecho

-11-

3.Karaoketone

◆PressTREBLEandBASSbuttonofKaraoke
ontheremotecontroltoadjustKaraoketreble
andbass.

After3secondssearchingradiostation,you
mayrotatetheMULTI-FUNCTIONknobto
Adjustvolume.

TREBLE BASS

Karaoketone

BASICOPERATIONS

2.3.11Tuning

Beforetuningoperation,pleaseselect
appropriatewavebandaccordingtothe
Followingsteps.

PressTUNERbuttonofsoundsource

◆

selectionontheremotecontrol;

PressBANDbuttonontheremotecontrolto

◆

selectwavebandordirectlyenterthetuning
FM,AMwavebandthroughmenu.1.Auto
search

RemoteControlMeans

PresstheMULTI-FUNCTIONbuttonforlong

◆

(above1second),andtheunitwill
automaticallysearchradiostationsforwardor
afterward.Untilradiostationwithstrong
signalissearched,itwillautomaticallystop.

PresstheMULTI-FUNCTIONbuttontofine

◆

adjustifnecessary.

MenuMeans

PressMENUbuttononthefrontpaneluntil

◆

VFDscreendisplays"TUNSEEK".

VCD

TUNER

TUNER

2.Autosearchandsaveradiostation

◆◆PressMEMORYbuttonontheremotecontrol

untilVFDscreendisplays"MEMORY".

PressMULTI-FUNCTIONbuttonforlong

(above1seconds),theunitwillautomatically
searchradiostationforwardorbackwardand
thenautomaticallysaveit.Thisunitmay
automaticallysave36FMand12AMradio
stations.

BAND

VCD

◆RotatetheMULTI-FUNCTIONknobandthe

unitwillautomaticallystopaftersearchingthe
radiostationwithenoughstrongsignal. Within
about3seconds,youmaycontinuerotating
theknobandsearchingradiostation.

BAND

3.Saveradiostationmanually

◆PressMEMORYbuttonontheremotecontrol
andthenNUMBERbuttonstosaveradio
station.Ifthesavedradiostationnumberis
over9,pleasepress2numberscontinuously.

-12-

◆Aftercompletelysaving,PRESETsymbolon
thescreenislightened.

HOMETHEATRERECEIVERAV311T

1

MUTE

SL

SOUNDFIELD

STEREO

PRESET

TUNER

STERO

STADIUM

DIGITAL

OPTICAL

MP3

SLEEP

RCL

SR

STAGE

CH HALL

DISCO

KHZ

MHZ

LIVE

MULTI-FUNCTIONknob

2

TheExplanationofMODEbutton

Thisunithastwoworkingmodesinthe

Receivingstatus:

AUTO/MANUAL

1InAUTOworkingmode,ifyouselectFM

、

Waveband,thisunitwillautomatically
recognizetheradiostationprogramismono
signalorstereosignalandkeepthemonoor
stereoReceivingstatus.

2Ifthereceivedradiostationprogramhas

、

Loudernoiseorcacophonyinstereostatus,
youmayswitchtoMANUALworkingmode.In
thisway,theunitisinmonoreceivingstatus
todecreasenoiseandcacophony
generally.Youmayswitchthetwoworking
modesthroughMODEbuttonontheremote
control.

4.Callthesavedradiostation

◆

PressNUMBERbuttonstocallthesavedradio

stationdirectly.

◆

PressFORWARD/BACKWARDbuttonstocall

thesavedradiostation.Calltheformeror
behindoneofthesavedradiostation.

◆

Aftercompletelycalling,"PRESET"symbolon

theVFDscreenislightened.

5.SelectAMstepvalue

◆

PressingAMSTEPbuttonforlong(above3

seconds)mayswitchtheAMstepfrequency
value,thatis,whentuningthestepvalueeach
timeis9KHzor10KHz.

MEM

Remotecontrol

AntennaConnection

YoumayuseouraccessionalAMandFM
indoorantennawheninbadreceivingeffect.
Generallyspeaking,theseantennaecansupply
enoughsignalstrength.

ConnecttoAMRoundAntenna

1Pushthejackbuttontoopenit.

、

2ConnecttheAMroundantennacordtoAM

、

ANTandGNDterminals.

3Letgooffthebuttontoclampthespeaker

、

cord.Pullthecordlightlytocheckthe
connectionIsrightornot.

VCD

Callthesavedradiostation

2.3.12Tuning(Continued)

-13-

HowtoConnect

Pushthejackbuttontoopenit.

1
3

2

1

Insertthespeakercord.

2

Letgooffthebuttontoclamp

3

thespeakercord.

4ConnecttheAMroundantennatothestand.、

4

AMroundantenna

Stand

5

5AdjustthedirectionofAMroundantennato

、

getthebestreceivingeffect.

Rotate

NOTE:

DonotusetheoutdoorandindoorFM

Antennaeatthesametime.

GND(Grounding)terminal

Inordertoensurethesafetyanddecreasethe
interference,pleasewellconnecttheGNDterminal.
Thebettergroundingmethodisinsertthemetalpole
intowetground.

2.3.13ChannelDelay

◆

Channeldelayoperationisonlyavailablein

DolbyDigital,DTSandDolbyProLogicII
modes.

◆

PressDELAYbuttonontheremotecontrol.

WhenVFDscreendisplays"CXXMS",use
MULTI-FUNCTIONbuttontoadjustthecentre
channeldelay.Theadjustmentrangeis0~5ms

◆

PressDELAYbuttonontheremotecontrol

again.WhenVFDscreendisplays"SXXMS",
useMULTI-FUNCTIONbuttontoadjustthe
surroundchanneldelay.Theadjustmentrange
is0~15msinDTSandDolbyDigitaldecode
modes,and15~30msinDolbyProLogicII
decodemode.

NOTE:
1AMroundantennashouldbeplacedfaraway

、

fromtheequipment.Youmayputuponthe
walloronthebookshelf.

2AMroundantennaandoutdoorantennacan

、

beusedatthesametime.

ConnecttoFMAntenna

ConnecttotheindoorFMantenna

ConnecttheaccessionalindoorFMantenna

to75UNBAL.FMANTterminal.

Ω

DELAY

Channeldelay

2.3.14NoiseTesting

-14-

◆◆Duringsystemworking,itisusedforusersto

adjustlevelbalancebetweenchannelsin
multi-channelstate.

Innon-STEREOdecodemode,pressTEST

buttonontheremotecontroltoenternoise
testingmode.Theunitwilloutputnoise
accordingtothesequenceofleft,centre,right,
surroundrigntandsurroundleft.Thelasting
periodofeachchannelis2s,duringwhich
timeusersmaypresstheMAINVOLUME
buttonontheremotecontroltosynchronously
adjust6-channellevel,andmayalsopress
MULTI-FUNCTIONbuttontoadjusteach
cnahhel'slevel.Toexitnoisetestingmode,
pleasepressTEST buttonagain.

SPK.

1

Selectspeakermode

2.3.16Headphone

◆Thisunitiswithindividualheadphoneamplifier.
Ifnecessary,pleaseinserttheheadphoneplug
intotheheadphonejackonthefrontpanel.In
thisstate,changingdecodemodeisinvalid.

VCD

TEST

Noisetesting

2.3.15SelectSpeakerMode

◆PressSPEAKERMODESETUPbuttononthe
remotecontrol,when"SPSMALL"or”SP
LARGE"appears,pressingMULTI-FUNCTION
buttonagainmaychangetheleft/rightspeaker
mode.Pressspeakermodebuttononthe
remotecontrol,when"SUBON"or"SUBOFF"
appears,pressingMULTI-FUNCTIONbutton
againmaysetwhetherthereissubwoofer
speakermode.

Note:Theselectionof"Large"or"Small"isset

byspeakercalibraterandbassplaying
ability.Whensubwooferspeakerand
subwooferoutputterminalareconnected,
youmayset"SUBON",orelse,"SUB
OFF".Whenspeakermodeissetin
"SMALL",subwooferspeakermustbeset
in"ON".

HOMETHEATRERECEIVERAV311T

MUTE

SL

SOUNDFIELD

STEREO

PRESET

TUNER

STERO

STADIUM

DIGITAL

MP3

OPTICAL

SLEEP

RCL

SR

STAGE

CH HALL

DISCO

KHZ

MHZ

LIVE

Headphone

-15-

2.4ACCESSORIES

UserManual

◆

RemoteControl

◆

AVCord

◆

◆

◆

◆

◆

''

Jacktomini-jackadapter

#

7AAAbattery
Warrantycard
FM/AMantenna

1pcs
1pcs

1pcs
1pcs
2pcs

1pcs
1suit

2.5SPECIFICATIONS

1RatedOutputPower

、

MainChannel(1kHz/4,RMS,TotalHarmonicDistortion1%):80W+80W
CentreChannel(1kHz/4,RMS,TotalHarmonicDistortion1%):15W
SurroundChannel(1kHz/4,RMS,TotalHarmonicDistortion1%):15W+15W

2Separability(1kHz,RatedCondition):

、≥

3TotalHarmonicDistortion(1kHz,RatedCondition):

、≤

4EffectiveFrequencyRangeunderLimitedGains(NormalWorkingCondition):

、

MainChannel20Hz~20kHzdB
Centre/SurroundChannel20Hz~20kHzdB

5Signal-to-NoiseRatio

、

MainChannel(Input600Short-Circuit,Aweighted):80dB
CentreChannel(Input600Shout-Circuit,Aweighted):73dB
SurroundChannel(Input600Shout-Ciucuit,Aweighted):73dB

6TUNER

、

Frequencyrange:FM:65-74MHz,87-108MHz

7InputSensitivity(RatedCondition)

、≤

8LoadImpedance

、Ω

POWER

1PowerSupply:~220V1050Hz

、±％

2MaximumPowerConsumption:500W

、

OTHERS

1NetWeight:About8kg

、

2Dimensions:420337135mm

、××

Ω≤

Ω≤

Ω≤

40dB

0.7%

+1

-3

+1

-3

Ω≥

Ω≥

Ω≥

AM:500-1611KHz(9KSTEP)

520-1710KHz(10KSTEP)

100mV

A114~8

-16-

ChapterThreeUnitCircuitPrinciple

SectionOnePrincipleoftheplayer

AV311T(RU)isanadvancedpoweramplifierlaunchedintomarketrecently.ItiswithDTS/AC-3
digitaldecodefunction,whichmakessoundprocessingmoreperfecttoeffectivelycontrolthedistortion
andnoiseinthecourseofaudiosignal.

3.1.1Compositionoftheplayer

1.Signalprocessingboard:gating,frontstageamplifyingofsignalandfrontstageprocessingof

Karaokesignal.

3.Controlpanel:VFDdisplay,menubuttonandmainvolumecontrol.

4.Powerboard:providevoltagerequiredbyeachunitcircuit,andperformtheplayerprotection

function.

5.Poweramplifierboard:poweramplifyingof5.2CHsignaloranalogsignal.

6.Headphoneboard:Karaokeinputandheadphoneoutputsignalamplifying.

7.Videboard:input/outputswitchoftwo-channelcompositevideoandS-videovideosignal.

3.1.2Functionandfeatures

Simpleoperationpanelinterface;thepaneloftheplayerhasonlyonepowerswitchbutton,menu

◆

buttonandalargeknob,simpleandclear;

◆

WirhDTS/AC-3decodefunction;

◆

Optical,coaxialsignaldecodefunction;

◆

Built-in5-channelpoweramplifying,adaptabletoAC-3/DTSandstereomusicreplay.Main

channel110W.Centre/surround22Wwithpowerfulpower;

◆

With6-channelvolumecontrolandseparatelevelcontrol,andalsowith7-bandelectronic

equalization;

◆

WithmultipleelectronicEQmodes,adaptabletodifferentmusicalstyles;

◆

Digitalsoundfielddelayfunction;

◆

Withtuningfunction;

◆

Withintelligentprotectionofover-currentandover-voltage

◆

Karaokefunctionandheadphoneoutput;

-17-

220V

Signaloutput

Xs1

Xl100

Powerboard

Transformerentry-level

Xs2

SWITCH

Xs3

Xs4

SWM
RLY0
P_RC

OVER

VC+
GND

GND

Secondarycoil

Secondarycoil

L2
R2

C2

Sl2
Sr2

VC-

~8.5V

GND

~8.5V

+12V

GND

-12V

RLY
P_RC

P_LRM

P_CSM

SWM

L1
R1

C1

Sl1

Sr1

D+5V
DGND

L1

R1

PH_SW

GND

MIC

Videoboard

xs101

xp20

Xs100

Xs22

Xs101

Signalboard

Xp17Xp16

Xs16

Xs17

Decodeboard

RDSoutlet

Xp14

Xs14

LAT
CE
CLK
DATA
DO

P_DIST
OK_DAT
OK_CLK

P_KT

REM

DST

DCK

DDA

Transformer

Xp25

Micorearphoneboard

Viewboard

+5VD

GND

RLYC
NC
DDA
DCK
DST

FAN

REMMOTE

DIGITALAUDIOINPUT

VCD

DVD

5.1CH

VCD

DVD

VCD

DVD

VIDEOBOARD

1
2
3
4
5
6

TUNER

6

6

6

Digital
audio

L

R

L

R

CD4052

CD4052

1
2
3

1
2
3

4052-A/4052-B

2*COAXIAL/OPTICAL

L/R

4052*2

L/R

5.1CH(L/R/SL/SR/C/SW)

OK_CLK/OK_DATA

9
8
7
6
5
4
3
2
1

L/R

DO/CLK/DAT/CE

4558_B

4558_A

+5V

PH_SW

PH_L
PH_R

Dual-decodeIC,
CPU

CPU

PT2315

MIC_VOL

TONE

ECHO
adjustment

Amplify

LM4880

P_DISP

Straightthrough

ECHO

PT2399

CPUI/O：

INPUTSET

5.1CH
4053_INT

L/R/SL/SR/C/SW

CLK/DAT/LAT

TUN_L/TUN_R

REMOTE

DCL/DDA/DST

DISPLAYBOARD

2*LED

PT6311

Mix&buffer

4558

Echovolume

CLK/DATA/LATDO/CE
OK-CLK/OK-DATAP-KT
DCL/DDA/DATAREMOTE
P-LRM/P-SCMP-RLYP-DISP
KM

0_LEVEL

2*KEY

VFD

FUNVOL

REMOTE

6311I/O：

62446I/O：

VOL&TONE

M62446

FAN

SL/SR

L/R

C

SW

KM

FAN

TUN-L/TUN-R
FANRLYC

4052-A/4052-B

5.1CH4053-INT

Mix&buffer

4558

Mix&buffer

5532

Mix&buffer

4558

+12V
AGND

Power

-12V

+6.8V

~VS
~VS

+5V

P_LRM/P_SCM

SW_OUT

+6.8V
AGND

-6.8V
+5V
+5VD

Load
detect

Vc+

AGND

Vc-

AMPBOARD

L
R

C
SL
SR

Relaydrive

RLYC

Mainpower
amplifierboard
power

POWERBOARD

Preposition
power

NGD

Vs-

Vs+

Central
surround
power

SWmuteandrelay
statedetect

L

R

C

SL

SR

MICPHONEBOARD、

SectionTwoUnitCircuitPrinciple

3.2.1Signalprocessingboard

1.Inputselectioncircuit

AV321T(RU)has6kindsofinputmeansinall:opticalinput,coaxialinput,CD,DVD,5.1CHand
tuninginput.Digitalsignalsofoptical,coaxialinputofthisplayeraredirectlysenttopoweramplifier
boardforprocessingthroughflatcable.AnaloginputselectionofAV321T(RU)isfulfilledthroughan
electronicswitchCd4052(N101)anditstruthvaluetableisshownasthefollowing:

Estate

状态

PIN

引脚

A 1 0 1
B 1 1 0

AV321T(RU)has3kindsofinputstates:tuning,VCD,DVD,andtheyarecontrolledthrough4052-

A,4052-Bsignalrespectively(refertotruthvaluefordetails).Signalsafterbeinggatedoutputfrompin3

VCD DVD

Tuning

andpin13ofN101,andthenoutputleft/rightmainchannelsignalfromitspin1,12throughN111CD
4052todecodeboardforsignalprocessing.

Analogsignalinputin5.1state:thegatingof5.1analogsignalinputofAV321T(RU)iscontrolledby
twoICCD4053(N102,N103),controlpin9,10,11ofCD4053areallcontrolledbythe5.1CHsignal
outputtedfrompin4ofM62446(N104),when5.1CHsignalishighlevel,thegatingisanalogsignalinput
of5.1state;inthisstate,thereisnodigitalsoundfield,allsignalsarestraightthrough;when5.1CHis
lowlevel,thegatingisthesynthesizedsignalafterdecoding.

Straightthroughanddigitalsoundfieldswitchcontrol:AV321T(RU)hastwodifferentmodesof
straightthroughanddigitalsoundfield,anditsgatinginputiscontrolledbyN111/CD4052andN102/CD.
Whencontrolsignal4053-INTishighlevel,foritisconnectedtotheenabledendofN102,thisICisin
nonworkingstate,mainchannelsignalsoutputthroughpin5,11ofN111anddirectlysendtoM62446
forprocessingtooutputHi-Fimusicalsignals.When4053-INTislowlevel,mainchannelsignalsare
senttodecodeboardfordigitalsoundfieldprocessingthroughXp17,andN102isalsoinworkingstate.

2.Karaokesignalprocessingcircuit

ForkaraokesignalssentfromMICbaseboard,aftercouplingandamplifying,onepathissentto
volumeandtoneadjustmentICPT2315(N203)forprocessing,thenafterechoanddelayadjustment

- 20 -

throughPT2399(N204),itissenttopoweramplifierboardforsmallsignalamplifyingthroughband­Passfilter.PT2315iscontrolledbyMCU,sousersmayadjusthisdesiredKaraokeeffectatwillthrough
remotecontroller.

Anotherpathsignal,afteramplifyingrectification,controlsaswitchtriodeV2019014tocontrolthe
high/lowlevelofdetectsignalP-KTtofulfilthedetectingofKaraokesignals.WhentheinputtedKaraoke
signalislargeenough,theDCafterbeingrectifiedmakestriodeV201onandthenpullsdownP-KT
signal,whichmeansthatthereisKaraokesignalinput.Now,KMcontrolsignalislowlevel,triodeV101
2N5401,V102S8050bothcutoff,KaraokesignalsenterICN107NE5532foramplifyingthrough
couplingcapacitorC147,C149,thentheyaresenttoleft/rightchannel;whenCPUcannotdetectsignals
inacertainperiod,P-KTishighlevel,nowKMcontrolsignalofCPUchangesintohighlevel,triode
V101,V102arebothontomakeKaraokesignalshortcircuittoground,systemmutesKaraoekpart
automaticallytopreventtheinfluencetosoundeffectcausedbynoise.

3.Fanstartingcircuit

Whenpoweramplifieriswithload,forpowerislargeandtemperatureriseishigh,thisplayer
adoptsfantoperformheatradiation.Whenvolumeismorethan45dB,FANsignalsentoutfromcontrol
paneN101changesintohighlevel,V1039014andV105S8050areontoformpowersupplyloopoffan.
Whentheconnectedloadisheadphone,controllinePH-SWishighlevel,V1049014isontopulldown
FANsignal,sonomatterhowisthevolumeofsystem,fanwillnotstartup.

3.2.2Decodeboard

Mainelementfunctionofdecodeboardisshownasfollows:

ICSM8958AC25P(N116):controlcoreofMCUsystem

◆

IC493264(N105):highperformancedigitalaudiodecoder,includingDOLBYdecode,DTS

◆

decodeandDSPprocessing

ICCS8415(N106):serialdigitalaudiosignalreceiver

◆

ICCS5340(N108):2-channelA/Dconverter

◆

ICCS4360(N107):6-chanelD/Aconverter

◆

IC24C02(N115):statememorizer

◆

IC74HC04(N101):6-channelphaseinverter

◆

ICBM1117-3.3(N109):3.3VvoltageregulatingIC,whichprovidespowerforCS8415,Cs4923

◆

Workingprinciple:foropticalandcoaxialsignals,afterbeingfilteredbyinductor,capacitor,
reshapedbyphaseinverter74HC04(N101),theyaresenttoserialaudiodigitalsignaltoreceivesignal
inputpin4,1214ofICCs8415(N106),thenconverseserial digitalaudiosignaltoPCMsignalthrough
thisIC,andoutputfrompin16(samplingspeedsignal),17(mainchannelclocksignal),18(audiodata
signal)ofthisICtopin25(samplingspeedcontrolsignal),pin26(clocksignal),22(PCMdatainputport

- 21 -

1)ofdigitalaudiodecodeICCs493264(N105)fordataprocessing.

Analogsignalsofleft/rightchannelaresenttodecodeboardthroughflatcableXs17,afterfront
stagesmallsignalprocessing,thensenttopin10,12ofICCs5340(N108)forA/Dconversiontochange
analogaudiosignalintoPCMsignal,thensentfrompin4(audioPCMsignal),17(samplingspeed

signal),18(clocksignal)ofN108topin27,28,29ofN105,thatis,inputfromanotherPCMinputportof

N105fordataprocessing.

Therefore,digitalsoundfieldprocessingofanalogsignalandprocessingofcoaxial,opticalaudio
digitalsignalareseparate,ifonlyonepathworksabnormally,thepossibilitythatproblemappears
beforeN105islarge.

CS493264(N105)iswithpowerfuldigitalsoundfieldprocessingfunction,allDSPprocessing,Pro.
LogicIIprocessingandDOBLY/AC-3processingareallperformedinsideunderthecontrolof
MCU/SM8958AC25P(N116).

AudioPCMsignalafterbeingprocessedbyCS493264(N105)issenttoCS4360(N107)forD/A
conversiontorestorePCMsignalinto6-channelanalogsignal,thenfilterhighfrequencysignaloutside
therangeofaudiofrequencythroughaband-passfilter, thensenttoinputgatingpartforselectioninput.

Actedashecoreofthewholesystem,MCU/SM8958AC25P(N116)hasimportantfunction.All
controlsignalsaresentoutbyit,anditwilldetecteachdifferentsignalanduserorderatanytimeto
controlactionofeachpartofmachine.IfthisIChastrouble,theplayerwillbenotabletoworknormally.

Inaddition,thisplayerhasnoautosearchfunction,butiscanautomaticallysaveandmemorizethe
workingstatelaettime,andenterthepreviousworkingstatewhenpoweronnexttime.

Thisplayeriswithtuningfunction,whichprovidesagoodfunctionselectionforusers.Itdirectly
controlsdigitaltunerreceiving(AM/FM)signalthroughMCUN116,andthenoutputsthroughpower
amplifier.ClockanddatelineofdigitaltunerisusedtogetherwithLM62446(N104),anothertwocontrol
linesaredirectlyconnectedtoN116,TUNERL,TUNERRsignalafterbeingprocessedbydigitaltuneris
directlysenttoCD4052(N101)forgatinginput.

3.2.3Controlpanel

ControlpanelismainlycomposedbyVFDdisplayscreen,driveICPt6311(N101),infraredremote
controllerHSOO38A2(N102)andindicatorlightdisplaycircuit.Itcompletesman-machineconversation
andworkingstatedisplaymainly.Thecomposedblockdiagramisshownasthefollowingfigure3.2.3.1:

UnderthecontrolofMCU,throughDSTstate,DCKclock,DDAdata,controlPT6311(N101),
displayworkingstateoftheplayerandfanstate,andreceiveusercontrolordersentoutbyPT6311
(N101),controlthecontrolledcircuitoftheplayertomaketheplayerworkinindicatedworkingstate.
Whenuserareoperatingpanelbuttons,controlorderissenttoPT6311(N101)throughkeyboard
scanningcircuit,PT6311(N101)outputscontroldatatoMCUthroughcodingdriveinsideandrealizes
thecontrolofcontrolledcircuitthroughMCU,andcontrolsVFDthroughPT6311(N101).

- 22 -

VFD

Display

Buttoncontrol

N101

PT6311

DDA

DCK
DST

MCU

Panelindicatorlightcontrolarea

Figure3.2.3.1Controlpanelcircuitblockdiagram

Remotecontrolreceiving

VFD101isvacuumflourescentdisplayscreenandthemostdistinctfeatureishighbrightness.The
workingprincipleissimilarwiththatofkinescopeofTVset.Pin1,2,46,47arefilamentpowersupply,
MCUcontrolsSEGelectrodethroughthecontrolofPT6311(N101)tomakecharactersofcorresponding
workingstatedisplayonscreen.

RemotecontrolreceivingcircuitismainlycomposedofremotecontrolreceiverHS0038A2(N102),
inwhicjpin1isgrounded,pin2powersupplyend,pin3issignalreceivingoutputpinandsenttoMCU
directlytocontrolcorrespondingcircuit.

3.2.4Powerboard

Thefunctionofpowerboardistoprovideallkindsofworkingvoltagerequiredbyeachunitcircuit.
Shownasinthefigure3.2.4.1AV321T(RU)adoptslarge-powerroundtransformer.Centreandsurround
channelofAV321T(RU)adoptCD1875and2TDA2052respectively,TDA2052ismonochannelpower

×

amplifyingandadoptsseparatepositive/negativepowersupply.

～ 26 V

～ 220V 50HZ

Figure3.2.4.1Powerblockdiagram

Paneldisplay

～ 38V

～

-23 -

16.3V

～2.2V

Rectification
Filtering

Rectification

Filtering

Filamentvoltage

Left/rightchannel
poweramplifying
level

C,SL,SRchannel
poweramplifying
level

ThetwogroupsAC35Vvoltageoutputtedfromthefirstsublevelwindingoftransformer,after
rectificationandfilteringof8In5404(VD100VD107)diodeand2electrolyticcapacitor(15000uF/63V,

～

C108,C109),positive/negative53Vpowerisachievedtosupplypowerforleft/rightchannel.

ThetwogroupsAC17Vvoltageoutputtedfromthesecondsublevelwindingoftransformer,after
rectificationandfilteringof4IN5404(VD111~VD114)diodeand2electrolyticcapacitor(4700uF/35V,
C141,C142),positive/negative23VpowerisachievedtosupplypowerforSL/SR/Cchannel.Forother
ICandoperationalamplifiers,aftervoltageregulatingof3-endvoltageregulatorL7812(N101),L7912
(N102),positive/negative12VpowerisachievedtosupplypowerforotherIC.

3.2.5Poweramplifierboardandprotectioncircuit

1,L,Rchannelpoweramplifyingcircuit

L,Rchannelpoweramplifyingcircuit:L,RmainpoweramplifyingcircuitofAV321T(RU)is
composedofdiscretecomponent,thecomposedblockdiagramisshownasthefollowingfigure3.2.5.1
(takeLchannelforinstance):

ACnegativefeedback
R121,R108,C105

Compositepower
amplifyingV132,V112

LIN

V101
V115

Mute

Differenceamplifying
levelV102,V103

MirrorimageconstantcurrentsourceV104,
V107,VD102,VD103

Figure3.2.5.1Poweramplifierandprotectioncircuitdiagram

Voltage
amplifying
levelV105

Temperature
compensation
levelV106

Compositepower
amplifyingV133,
V113

Speaker

Relay

Lchannelsignal,throughR101,R103,C101coupling,issenttoBelectrodeofdifferential
amplifyingstageV102,V102andV103composethedifferentialamplifyingcircuitofsingle-endinput
andsingle-endoutput.AudiosignalisoutputtedfromCelectrodeofV102toBelectrodeofvoltage
amplifyingstage,thentocompositepoweramplifyingstageaftervoltageamplifying.V104,V107,
VD102andVd103composemirrorconstantcurrentcircuit.VD102,VD103provideV104,V107with
constantbaseelectrodecurrent.EmitterelectroderesistanceofV104decidesworkingcurrentof
differentialamplifyingstage,emitterelectroderesistanceofV107decidesworkingcurrentofvoltage
amplifyingstage.V132andV112composemultipleunittubeamplifyingtomakefinalstageofpower
amplifierhavepowerfulcurrentamplifyingability,andtheycomposepositivehalfcycleamplifying
waveform.V133andV113composenegativehalfcycleamplifyingwaveform.Thefunctionof

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Temperaturecompensationtubeincircuithastwo:firstly,itisthebaseelectrodebiasofupper/lower
geminatetransistoranditsworkingstatedecidesstaticworkingcurrentofcompositepoweramplifying
stage,thatis,throughadjustingtheonstateofV106,staticworkingpointofcompositepoweramplifying
stagemaybeset.ThecommonmeansischangebaseelectroderesistanceofV107;itmayalso
automaticallyadjustworkingstateofcompositepoweramplifyingstageaftertemperatureincreases.
Theadjustmentprocessisasfollows:

Totalcurrentofoutputlevel=workingcurrent+leakagecurrent

Whentemperaturebecomeshigh,leakagecurrentincreasestoleadtostaticworkingpointdrift
(unfavourable).

Atthesametime,theleakagecurrentofV106increases,Ucedecreasestomakebiascurrentof
outputleveldecrease,workingstatechanges,workingcurrentofbackstagedecrease,andtemperature
compensationfunctionisrealized.

InpoweramplifyingcircuitofAV321T(RU),voltagenegativefeedbackisintroducedandcomposed
byR121,R109,C105,whichmaystabilizestaticworkingpointofdifferentiallevel.AV321T(RU)adopts
directoutputmeans,R111andC116connectedonoutputendcomposeZobelnetwork,whichmay
preventhighfrequencyself-excitationcausedbyACinductivereactanceofspeakersoundcoil.

2.Mutecircuit

WhenpressingMUTEbuttononremotecontroller,afteroptical-electricconversionofsignal
conductedbyinfraredreceiver,amutesignalisachievedandsenttoMCU,P_LRMhighleveland
P_CSMlowlevelmuteorderissentoutfromMCUatthesametime,P_LRMhighlevelmakes2N5401
(V115),S8050(V101),S8050(V116)on,leftandrightchannelsignalareshort-circuitedtoground,and
mutecontrolfunctionofleft/rightchannelfinishes;P_CSMlowlevelmakes9014(V150)cutoff,2N5401
(V130)andS8050(V131)areon,centerchannelsignalisshort-circuitedtoground,andmutecontrol
functionofcenterchannelfinishes;atthesametime,P_CSMlowlevelmakes9014(V151)cutoff,
voltageofpin5ofTDA7265ospowervoltage,TDA7265internalmutecircuitworkstoreachsurround
channelmuteeffect.

3.C,SR,SLpoweramplifyingcircuit

Comparedwiththeformermodels,thethreechannelsofAV311T(RU)adoptspecialaudiopower
amplifyingICCD1875CZ(N104)andTDA7265(N106).AsforTDA7265(N106),ithas11pinsinall,pin
3,1and6areitspositive/negativepower pin;pin11and7areitsin-phaseinputterminal;pin10and8
areitsreverseinputend,theratedoutputpowerofeachchannelofthispowerICmaybeupto15W,
withautomutefunctionwhenpoweron;asforCD1875CZ(N104),ithas5pinsinallandisagood
performancepoweramplifyingICwith15Wpoweroutputinratedstate.pin5and3arepositiveand
negativepowerpin.

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