BBK DV317SI, DV323SI, DV324SI, DV326SI, DV521SI Service manual

DV317SI
DV323SIDV324SI
DV326SIDV521SI

servicemanual

Catalog

ChapterOneAboutMaintenance

1.1Safetyprecautions

1.1.1Powersupply

1.1.2Precautionsforantistatic

1.1.3Precautionsforlaserhead

1.1.4Aboutplacementposition

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

1

2

2

2

2

2

2

2

3

3

3

ChapterTwoFunctionsandOperationInstructions

2.1Features

2.2ControlButtonLocationsandExplanations

2.2.1FrontPanelIllustration

2.2.2RearPanelIIIustration

2.2.3LEDDisplayWindowlllustration

2.2.4RemoteControlIllustration

2.3Accessories

2.4FUNCTIONSETUP

2.4.1FunctionSetup

2.4.2Language

2.4.3Image

2.4.4Sound

2.4.5Playback

4

4

4

4

5

5

5

6

6

6

7

7

8

8

2.4.6Karaoke

8

2.4.7Preference

2.4.8Parentalcontrol

2.4.9Initialsetup

2.4.10Resttodefaults

2.4.11Exit

2.5Specifications

ChapterPrincipleandServicing

SectionOnePrincipleofthePlayer

3.1.1Blockdiagramoftheplayer

3.1.2PCBboardblockdiagramoftheplayer

3.1.3HowtouseIC

SectionTwoUnitCircuitPrinciple

3.2.1Introductiontolaserhead

3.2.2Servocircuit

9

9

9

9

10

10

11

11

11

12

13

14

14

16

3.2.3Open/closedrivecircuit

3.2.4Laserpowercontrolcircuit

3.2.5CD/DVDconversioncircuit

3.2.6Mainaxiscontrolcircuit

3.2.7Decodecircuit

3.2.8Resetcircuit

3.2.9Videocircuit

3.2.10Audiocircuit

3.2.11Mutecircuit

3.2.12Decodecircuitvoltageregulating

3.2.13Powercircuit

3.2.14MICcircuit

3.2.15Headphonecircuit

3.1.16AVoutputboardcircuit

3.2.17Controlpanelcircuit

18

18

19

20

21

23

23

24

25

26

27

28

29

29

31

SectionThreeServicingCases

3.3.1Servicingcases

3.3.2Troubleshootingflowchart

SectionFourWaveformdiagram

33

33

39

53

SectionFiveFunctionIntroductiontoIC

59

3.5.1functionintroductiontoMT1389E

3.5.2functionintroductionto4558

3.5.3functionintroductiontoAT24C02

3.5.4functionintroductiontoTDA1308

3.5.5functionintroductiontoVIPer22ADIP

3.5.6functionintroductiontoAM5888S

3.5.7functionintroductiontoPT6961(4dv315)

3.5.8FunctionintroductiontoSDRAM

3.5.9FunctionintroductiontoFLASH

3.5.10FunctionintroductiontoLM431A

3.5.11FunctionintroductiontoPc817

ChapterFourDisassemblyandAssemblyProcess

ChapterCinquePCBboard&CircuitDiagram

59

72

73

74

75

76

78

79

80

81

81

83

84

SectionOnePCBboard

SectionTwocircuitdiagram

ChaptersixBOMList

DV323SI/DV324SIServiceManual

7.1.1Features

7.2.1PCBboardblockdiagramoftheplayer

7.3.1MICcircuit(6324SI-1)

7.3.2Headphonecircuit(A323S-0)

7.3.3Controlpanelcircuit

7.3.4Audiocircuit

7.4.1Servicinginstances

7.4.2Troubleshootingflowchart

7.5.1PCBboard

84

92

99

110

110

111

112

112

113

114

115

118

120

7.5.2circuitdiagram

DV326SIServicingManual

8.1.1Features

128

131

131

8.2.1PCBboardblockdiagramoftheplayer

132

8.3.1Audiocircuit

8.3.2Controlpanelcircuit

8.3.3MICcircuit(6971S-0)

8.3.4Headphonecircuit(6971S-0)

8.4.1Troubleshootingflowchart

8.5.1PCBboard

8.5.2circuitdiagram

DV521SIServiceManual

9.1.1Blockdiagramoftheplayer

9.2.1PCBboardblockdiagramoftheplayer

9.3.1Audiocircuit

9.3.2MICcircuit(6521SI-1)

9.3.3Controlpanelcircuit

9.3.4Powercircuit

133

134

135

135

137

138

142

144

144

145

146

147

147

148

9.4.1PCBboard

9.4.2circuitdiagram

150

156

Chapter One About Maintenance

1.1 Safety precautions

1.1.1 Power supply

When maintenance personnel are repairing DVD players, he should pay special attention to the

power board with 220V AC and 330V DC which will cause hurt and damage to persons!

1.1.2 Precautions for antistatic

Movement and friction will both bring static electricity which causes serious damages to integrated

IC. Though static charge is little, when a limited quantity of electric charge is added to large-

scaleintegrated IC, as the capacitance is very small in the meantime, now the integrated IC is very much

easy to be struck through by static electricity or the performance will decrease. Thus static electricity

prevention is of extraordinary importance. The following are several measures to prevent static

electricity:

1. Use a piece of electric conduction metal with the length of about 2 metres to insert into the earth,

and Fetch the lead wire from the top of the surplus metal and connect to the required static electricity

device. The length and depth of the metal embedded under the earth should be determined according to

the wettability of the local soil. For humid places, it may be shorter, and longer and deeper for dry places.

If possible, it can be distributed and layed in terms of “#” shape.

2. On operating table-board, the antistatic table cushion should be covered and grounded.

3. All devices and equipments should be placed on the antistatic table cushion and grounded.

4. Maintenance personnel should wear antistatic wrist ring which should be grounded.

5. Places around the operating position should also be covered with electric conduction cushion or

Painted with antistatic paint.

1.1.3 Precautions for laser head

1. Do not stare at laser head directly, for laser emission will occur when laser head is working, which

will Hurt your eyes!

2. Do not use wiping water or alcohol to clean laser head, and you may use cotton swab.

- 1 -

1.1.4 About placement position

1. Never place DVD player in positions with high temperature and humidity.

2. Avoid placing near high magnetic fields, such as loudspeaker or magnet.

3. Positions for placement should be stable and secure.

1.2 Maintenance method

1.2.1 Visualized method

Directly view whether abnormalities of collision, lack of element, joint welding, shedding welding,

rosin joint, copper foil turning up, lead wire disconnection and elements burning up among pins of

elements appear. Check power supply of the machine and then use hands to touch the casing of part of

elements and check whether they are hot to judge the trouble spot. You should pay more attention when

using this method to check in high voltage parts.

1.2.2 Electric resistance method

Set the multimeter in resistance position and test whether the numerical value of resistance of each

point in the circuit has difference from the normal value to judge the trouble spot. But in the circuit the

tested numerical value of resistance is not accurate, and the tested numerical value of integrated IC's

pins can only be used for reference, so the elements should be broken down for test.

1.2.3 Voltage method

Voltage method is relatively convenient, quick and accurate. Set the multimeter in voltage position

and test power supply voltage of the player and voltage of a certain point to judge the trouble spot

according to the tested voltage variation.

1.2.4 Current method

Set the multimeter in current position and test current of the player of a certain point to judge the

trouble spot. But when testing in current method, the multimeter should be series connected in the

circuit, which makes this method too trivial and troublesome, so it is less frequently used in reality.

1.2.5 Cutting method

Cutting method should be combined with electric resistance method and voltage method to use.

This method is mainly used in phenomena of short circuit and current leakage of the circuit. When

cutting the input terminal voltage of a certain level, if voltage of the player rises again, it means that the

trouble lies in this level.

- 2 -

1.2.6 Element substitution method

When some elements cannot be judged good or bad, substitution method may de adopted directly.

1.2.7 Comparison method

A same good PC board is usually used to test the correct voltage and waveform. Compared these

data with those tested through fault PC board, the cause of troubles may be found.

Through the above maintenance method, theoretical knowledge and maintenance experience, all

difficulties and troubles will be readily solved.

1.3 Required device for maintenance

Digital oscillograph ( 100MHE)

TV set

SMD rework station

Multimeter

Soldering iron

Pointed-month pincers

Cutting nippers

Forceps

Electric screw driver

Terminals connecting cord

Headphone

Microphone

- 3 -

ChapterTwoFunctionsandOperationInstructions

2.1Features

ThisplayerhasemployedthenewgenerationDVdecodechipwithbuilt-inDolbyDigitaldecoder
whichwillbringyoutoabrand-newAVentertainmentworld.The2-lasersupererror-correction
mechanismsupportsCD-R.

Brand-newAVEffects

1.CompatiblewithMPEG4discstoproducewonderfulpictures.

2.108MHz/12bitvideoDAC,withmorevividandbrilliantpictures.

3.Progressive-scanvideooutputstoeliminatetheflickershardlyovercomebyinterlacingscanand
thereforeyoureyesightwillbewell-protected.Atthesametime,thepicturesdefinitionIssharply
enhancedandthepictureswillbefiner,smootherandstabler

4.Brightness,chromaandcontrastadjustmentfunctionstorenderyoureyesmorecomfortable.

5.DigitalechoKaraoketoenableyoursingingeasier.

6.CompositeVideo,S-VideoandComponentVideooutputs.

7.Dolbyoutputfor2channel(DOWNMIX)

HighQualityDigitalAudio

1.OpticalandcoaxialoutputsforDigitalaudio.

2.DTS,DolbyDigital,PCMDigitalaudiooutputstosatisfytheFans’sacousticrequirements.

ManyConvenientFeatures

1.ScreensaverprotectsyourTVsetcarefully.

2.ThenovelMp3playbackwindowGUIprovidesyouanewwaytoappreciateMp3music.

3.Multi-angleplaybackfunctionmakesitpossibleforyoutoviewascenefromdifferentcamera
angles.

4.It’spossibletoselectthedesiredbeginning,developmentandendingofastory.

5.Directentryintodesiredscenes(title/chapter/tracksearch).

6.Zoomingfunctiontozoomupanyplayingpicture.

7.CapableofplayingPAL/NTSCdiscs.

8.MultipleaspectratiostofitTVsetsofvariousscreenratios.

9.Parentallockfunctiontopreventchildrenfromwatchingunsuitablediscs.

10.Multipledubbinglanguagesandsubtitlelanguagesbringyouthebestentertainmentstatusall
thetime.

SuperCompatibilitywithsuperVCD,VCD,CD ,CD-R,MP3,HDCD,KODAKPICTURECDetc.

2.2ControlButtonLocationsandExplanations

2.2.1FrontPanelIllustration

1

10

-4-

324

6 7 8 95

1

POWERswitch

2

Displaywindow

3

IRSENSOR

4

MICjack

5

Headphonejack

2.2.2RearPanelIIIustration

6

STOPbutton

7

PLAYbutton

8

PAUSEbutton

9

OPEN/CLOSEbutton

10

Disctray

1

2CHAudioOutjacks

2

VideoOutjack

3

S-Video

4

VideoComponent/YPbPrOutjacks

2.2.3LEDDisplayWindowlllustration

2.2.4RemoteControlIllustration

1

[]

Button

Openorclosethedisctray.

2

LANGButton
Changetheaudiolanguageoraudiochannel.

3

MEMORYButton
Savetheplayingpointorjumptothesaved
point.

4

DISPButton
Displayorhidediscinformation.

5

NUMBERButtons

6

BROWSEButtons
switchnewuserinterface.

7

CURSORButtons

Playbacktime

8

9

10

11

12

13

14

5

DigitalAudioCoaxialOutjack

6

DigitalAudioOpticalOutjack

7

SCARTOutjack

SETUPButton
FunctionSetup.

[]

Button
Open/closethevirtualkeyboardfunction.
KARAOKEButton
Karaokeoperationmenu.

[]

Button
Fastbackwardplay.

[]

Button
Skipbackward.
PEPEATButton
Repeatplay.
A-BButton

-5-

10

12
13
14

1

2
3
4

5

6

7

8
9

11

15
16
17

18

19

20

22
23

24
25

26

27

28

29

21

MUTEButton
Pressoncetomute,twicetoturnoff.

Repeattheselect.

15

[]

Button

Pressoncetostandby,Presstwicetoplay.

16

SUBTButton
Changesubtitlelanguage,SwitchJPEG
displaymode.

17

Q-PLAYButton
Skiptheadvertisement/warningandplaythe
DVDdirectly.

18

ANGLEButton
Changecameraangle.

19

MENUButton
DisplayDVDmenuoropen/closePBC.

20

OKButton

21

CancelButton

22

ZOOM+/-Button
Zoomin/outthedisplayedframe.

[]

23

Button

Playorpauseplayback.

[]

24

Button

Fastforwardplay.

25

[]

Button

Stopplayback.

26

[]

Button

Skipforward.

27

CAPTUREButton
Settheplayedimageasthepower-onlogo.

2829

VOL+/-Button
Increase/decreasevolumelevel.

2.3Accessories

AUDIO/VIDEOCORD
REMOTE
AAASITEBUTTERIES
WARRANTYCARD
USERMANUAL

2.4FUNCTIONSETUP

2.4.1FunctionSetup

1.Pressthe[SETUP]buttonandthescreendisplaystheselectionmenuoffunctionsetup.

Language
Image
Sound
Playback
Karaoke
Preference
Parentalcontrol
Initialsetup
Resettodefaults
Exit

Setupmenu
DVDmenu
Soundtrack
Subtitle

Off

1PCS
1PCS

2PCS
1PCS
1PCS
1PCS

-6-

2.Pressthe[CURSOR]buttontoselectthemenu
tobeenteredandpressthe[OK]orbuttonto
confirm.Orpressthe[CURSOR]buttonto
Exititemandthenpressthe[OK]buttontoexit

3.Press[UP/DOWN]arrowtoselectthedesired
itemyouwanttosetandpress[OK].

Forexample,press[UP/DOWN]arrowstoselect
IMAGEandpress[OK].TheImagesettingpage
Appearsonthescreen.

Off

LB

AUTO
PAL

IS

NTSC

L.

0
0
0
0

TVsystem
TVscanmode
Videoout.
TV

format
Sharpness
Gamma
Brightness
Contrast
Hue
Saturation

AUTO

S-Vid.

menulangwhenplaying.

Optionalsetting:

◆

Russian,English,Estonian,
Latvian,Kazakh,Romanian,Byelorussian,
Ukrainian,Chinese,Others.

Default:English.

◆

3.Sountrack:Tosetthepreferenceaudio
languagewhenplaying.

Optionalsetting:

◆

Russian,English,Estonian,
Latvian,Kazakh,Romanian,Byelorussian,
Ukrainian,Chinese,Others.

Default:English.

◆

4.Subtitles:Tosetthepreferencesubtitle
languagewhenplaying.

Optionalsetting:Off,

◆

Russian,English,
Estonian,Latvian,Kazakh,Romanian,
Byelorussian,Ukrainian,Chinese,Others.

Default:Off.

◆

2.4.3Image

4.Press[UP/DOWN]arrowtoselectthe
SHARPNESSitem.Press[OK]toconfirmit.
Andthenpress[UP/DOWN]arrowtoselectthe
desiredvalus.Forexample:Press[UP/DOWN]
arrowtoselect“Medium”,thenpress[OK],the
TVscreendisplay.

TVsystem
TVscanmode
Videoout.
TV

format
Sharpness
Gamma
Brightness
Contrast
Hue
Saturation

AUTO

Com.

LB

Off

IS

L.

High
Medium

0

Low

0
0
0

5.Press[LEFT]buttonifyouwanttoreturntothe
previoussetuppage.

6.Press[SETUP]toexitthesetupmenu.

2.4.2Language

Setupmenu
DVDmenu
Soundtrack
Sbutitles Off

1.Setupmenu:Thisitemisusedtosetthe

promptslanguageonthescreen.

Optionalsetting:Russian,English,Ukrainian.

◆

Default:English.

◆

2.DVDmenu:Tosetthepreferencedisc

Russian
English
Ukrainian

Off

AUTO
PAL

IS

NTSC

LB

L.

0
0
0
0

TVsystem
TVscanmode
Videoout.
TV

format
Sharpness
Gamma
Brightness
Contrast
Hue
Saturation

AUTO

Com.

1.TVsystem:Thisitemisusedtothevideo
outputsystemofthisunit.
Optionalsetting:Auto,PAL,NTSC.

◆

Default:AUTO.

◆

2.TVscanmode:Toset
Interlacedscanmode
Optionalsettings:Progressive,Interlaced.

◆

Default:Interlaced

◆

Progressivescan,

.

3.Videooutput:TosetthetypesofSCARTout
connector.

4.TVnformat:Tosettheaspectratioofthis
player’soutputimage.
Optionalsetting:4:3Pan-scan,16:9letterb.,

◆

16:9TV.
Default:16:9letterb

◆

5.Sharpness:Usedtosetthesharpnessof
videooutputs.
Optionalsetting:High,Medium,Low.

◆

Default:Medium.

◆

6.Gammaemendation:Thisitemisusedtosetup
theGammavalueofvideooutput.
Optionalsetting:High,Medium,Low,Off.

◆

Default:Off.

◆

-7-

7.Brightness:Usedtosetthebrightnessofvideo
outputs.

8.Contrast:Usedtosetthecontrastofvideo
outputs.

9.Hue:Usedtosetthehueofvideooutputs.

10.

Saturation:Usedtosetthesaturationof

videooutputs.

Brightness,contrast,hueandsaturation

◆

adjustingmeans:

A.

Press[UP/DOWN]arrowinthevideosetup

menutoselectthedesireditemyouwantto

adjust.Press[OK]or[RIGHT]buttontoenter

Theitem'sadjustment.

B.

Press[UP/DOWN]arrowtoadjustthesetting

Value.

2.4.4

Sound

Mixer...
Digitaloutput
Tuning

Stereomix
Surr.Mix

L+R

off

1.Mixer...

Stereomix
Surr.Mix

L+R

L+R
L

off

R

A.Stereomix:Tosettheoutputmeansoftheleft

orrightaudiowhenplayingaDolbydiscwith
separatetwo-channelaudio.

Optionalsetting:L+R,L,R.

◆

Default:L+R.

◆

B.Surr.Mix:Tosetoutputmeansofthesurround

leftandrightaudiowhenplayingastereodisc.

Optionalsetting:Off,sum,Virt.Surr.

◆

Default:Off.

◆

2.Digitaloutput:selecttosettheformatand
streamformofdigitalaudiooutput.

A.SPDIFformat:

Optionalsetting:RAWformat,SPDIF/PCM.

◆

Default:RAWformat.

◆

B.LPCM

Optionalsetting:48kHz16bit,96kHz24bit.

◆

Default:48kHz16bit.

◆

3.Tuning:

A.Maxvolume:setthemaximumvolumelimit.
B.Equalizer:TosetEqualizermodes.

Optionalsetting:Off,Rock,Pop,Live,Dance,

◆

Techno,Classic,Soft.

Default:Off.

◆

C.Echo:Tosetdifferentsoundfieldeffects.

Optionalsetting:Off,Concert,Livingroom,

◆

Hall,Bathroom,Cave,Arena,Church.

◆Default:Off.
D.Tonebalance

:tosetthetoneleveltomatch

yourdiapasonwhenyou'resinging

Methodtoadjusttonecontrol:

◆

Press[UP/DOWN]cursorbuttonstoselect

◆

"tone"iteminAudioSettingpage,andthen
press[OK]or[RIGHT]buttontoenter
AdjustmentMenu.

b.Press[UP/DOWN]cursorbuttontoadjust

settingvalue.

C.Press[OK]or[LEFT]buttontoreturntoAudio

Settingpageafteradjustmentsaredone.

2.4.5Playback

DVD
VCD/SVCD
Files
Repeat
Loadeffect

A.P.V

1.DVD:setwhetherinformationof
advertisementandwarningsatthebeginning
ofDVDdiscisskippedtoplaythemovie
directly.

Optionalsetting:Yes,NO

◆

Default:number

◆

Optionalsetting:On,Off.

◆

Default:On.

◆

2.VCD/SVCD:TosetthePCBstatus.

WhenplayingSuperVCDorVCD2.0discs,if

◆

thePCBisON,themenuimagedisplays.

3.Files:datadiscmayprobablyincludesMp3,
JPEGandMPGformatfilesinwhichyoumay
selectDVDplayertoreadthefiletype.

Optionalsetting:Audio,Picture,Video.

◆

Default:Audio,Picture,Video.

◆

4.Repeat:selecttherepeatplaybackmode.

Optionalsetting:Off,Single,all.

◆

Default:Off.

◆

5.Loadeffect:setthemaytoplayJPEGimage.

Optionalsetting:Off,fromtop,frombottom.

◆

Default:Off.

◆

Advertisemenu No

Off
Off

2.4.6Karaoke

Microphone

Volume
Echo

1.Microphone:switchonoroffmicrophone.

Optionalsetting:On,Off.

◆

Default:Off

◆

2.Volume:.

On

4
4

-8-

A.Inmicrophonesetuppage,press[UP/DOWN]

cursortoselect“Volume”item,andthenpress
[OK]buttontoentertheadjustmentmenu.

B.Press[UP/DOWN]cursortoadjustthesetup

value.

C.Afteradjustmentfinishes,press[OK]button

toreturntomicrophonesetuppage.

Microphone
Volume
Echo

Off

On
Off

5
5

3.Echo:
A.Inmicrophonesetuppage,press[UP/DOWN]

cursortoselect“Echo”item,andthenpress
[OK]buttontoentertheadjustmentmenu.

B.Press[UP/DOWN]cursortoadjustthesetup

value.

C.Aftertheadjustmentfinishes,press[OK]

buttontoreturntomicrophonesetuppage.

Microphone
Volume
Echo

On

4

◆Default:On.

2.4.8Parentalcontrol

any
Kid
G

Allowed..
Setpassword

Any

1.Allowed..:Tosettheparentalcontrolratingsto

preventchildrenfromwatchingtherestricted
contents.(Incasethediscsupportsthis
function.)
Optionalsetting:any,Kid,G,PG,PG-13,PGR,

◆

R,NC-17.
Default:any.

◆

2.Setpassword:Tosetfourdigitpasswordto

enableyoutochangetheparentalcontrol
ratings.
Default:7890.

◆

Oldpassword

PG
PG-13
PGR
R
NC-17

2.4.7Preference

std.

On

Off

On
Off

Gr.equalizer
Background
Screensaver

1.Gr.equalizer:Thisitemisusedtosetwether
theDynamicSpectrumisallowed.
Optionalsetting:On,Off.

◆

Default:Off.

◆

DynamicSpectrumdisplayisinvalidinData

◆

discDVDAUDIOplayback.

、

2.Background:Thisitemisusedtisetupthesort
ofPower-inLogo.
Optionalsetting:Standard,saved.

◆

Default:Standard.

◆

NOTE

TheScreenLogorefersthatusetheimage
selectedbypressingthe[CAPTURE]buttonas
thepower-onlogo.Whenintheoperationof
changingscreen,ifthepower-onlogohasnot
setinScreenLogo,theunitwillautomaticallyset
thepower-onlogoasScreenLogo.

3.Screensaver: Openorclosethescreensaver

function.
Optionalsetting:On,Off.

◆

Newpassword
Verify

OK Cancel

2.4.9Initialsetup

Auto
PAL
NTSC

Press[UP/DOWN]arrowtoselectthedesired

optionandPress[OK]buttontoconfirmit.

NOTE

Inthissetupstate,youmaynotpress[LEFT]

buttontoreturntothepreviousmenu.

2.4.10Resttodefaults

Loadfactorysettings

OK

Cancel

-9-

Resettodefaults:Torestoreallsettingstothedefaultvalueexceptfortheparentalcontroland
passwordsettings.

2.4.11Exit

Language
Image
Sound
Playback
Karaoke
Preference
Parentalcontrol
Initialsetup
Resettodefaults
Exit

Press[UP/DOWN]arrowtoselecttheExititem.Press[OK]buttontoexitthesetupmenu.

2.5Specifications

Playable discs

Inputs

Outputs

Video characteristics

Audio characteristics

Operating voltage
Power consumption

General specification

Operating temperature

DVD-Video,Super VCD,VCD,MPEG-4,CD-DA,CD+G,HDCD,MP3,WMA,
Kodak Picture CD,JPEG

MIC input

Audio outputs

Video outputs

Analog audio output: Stereo
Digital audio output: Coaxial,Optrcal

Composite,S-Video,componont Y Cb Cr, progressive
scan output Y Pb Pr,RGB/SCART

Headphones output
Video amplitude: 1.0Vp-p(75Ω)

S-Video amplitude: Y:1.0Vp-p(75Ω) C:0.286Vp-p(75Ω)
Component video amplitude: 1.0Vp-p(75Ω)

Cb/Cr:0.7Vp-p(75Ω)

Frequency response 20-20000 Hz(±1 dB)
Signal-to-noise ratio >100(dB)
THD <0.01%

~110-250V,50/60 Hz
14W

Dimensions: 380×210×43 mm
Mass: 1.85 kg

5-35℃

Operating humidity

◆

Designandspecificationsaresubjecttochangewithoutnotice.

◆

Wedonotgraranteethatalldiscscanbeplayedsmoothlyduetothediscquality,discrecording

qualityandrecordingformat.

15-75%(no condensation)

-10-

ChapterPrincipleandServicing

SectionOnePrincipleofthePlayer

3.1.1Blockdiagramoftheplayer

DV317SIiscomposedbydecodecircuit,servocircuit,audiocircuit,videocircuit,MICcircuitand

powercircuit,theblockdiagramoftheplayerisshownasinthefollowingfigure3.1.1.1:

Feed
electric
machine

Main
axis
electric
machine

ACIN

VR-DVD

VD-CD

LD-DVD

LD-CD

TK­TK+

FC+

FC-

SL+

M

M

SL-

SP+

M

SP-

Power
board

CD/DVDswitch

Laserpower
control

DVD:A/B/C/D/RFO

CD:A/B/C/D/E/FRFO

Am5888

U301

TRB2

TRB1

REGO1

Voltage
regulating
circuit

SDRAM64M

U208

Ld02

Ld01

MDI

VIP4

FOSO

FMSO

DMSO

TRSO

REGO2

V18

Dv33

+9V

IOA

FLASH16M

U207

MT1389E

U201

UREST

Reset

Panel

MICboard

XI

SDA

SCL

27Mclock

EEPROM

U202

24C02

XO

MIC1

AL

AR

CVBS

Y/G

CB/B

CR/R

Audio
amplifying
filtering

U209

CVBS
B/U
R/V
G/Y

L

R

SY

SC

Audio
output
terminal

S-video

Videooutput

L#

R#

SPDIF

VIEDO#

PB#
PR#

Y#

-9V

Figure3.1.1.1Blockdiagramoftheplayer

-11-

Buttonboard

A983E-0

Loaderframe Smallbracket

Laserhead

XS403

Mainpanel

4983e-1

XS402

1

234

Subsidiarypanel

9DV983-0

7

6

5

4

3

2

1

XS307 Xs306 XS301

FSO

VSDA

VSCK

VSTB

GND

Xs201

Decodeboard

2DV983A-2

VCC

IR

XS203

CN501

Powerboard

XS205

XS601

MICandheadphoneboard

5317SI-1

HSYNC#

VSYNC#

SPDIF

VCC

VIDEO_R/V

GND

VIDEO_G/Y

GND

VIDEO_B/A

POATO

VIDEO#

+9V

L#

R#

6DV317SI-0

1
2

3
4

5
6
7
8

9

10
11

12
13

14

PDAT2

PDAT1

SPDIF

VCC

Pr

VGND

Y1

VGND

Pb

PDATO

VIDEO#

+10V

L

R

AVboard

7231-0

XS702

XS602

BCN501

AC220V

Thismachineismainlycomposedofdecodeboard,powerboard,AVoutputboard,MIC&

headphoneboard,mainpanel,subsidiaryboardandbuttonboard.

Decodeboard:includesdecode,servo,audio,videooutputcircuit.

Powerboard:providesworkingvoltageforeachcircuit,outputvoltagehas+9V,9Vand+5V.

AVoutputboard:includesSCART,componentvideo,opticalandcoaxialoutputterminal.

MIC&headphoneboard:withsingle-waymicrophoneinput,headphoneamplifyingandoutput

function.

Mainpanel:connectedwithsubsidiaryboard,buttonsboardtofulfilbuttonsfunctioncontrol,remote

controlandLEDdisplay.

Remark:inordertofacilitatereaderstobetterknowthecompositionofmachine,wehavemade

PCBcompositionfigure,theconnectinglinesinPCBcompositionfigurearethemaincontrolline,signal

lineandpowercordconnectedthroughflatcable,butallconnectedflatcablearenotincluded.

3.1.3HowtouseIC

DV317SIICusageinstructionisshownasinthefollowingtable:

Semi-finished PCB

name

Power board

5317SI-1

Main panel 4983E-1

OK board

6DV317SI-1

Decode board

2983A-2

IC model name Location Function

AZ431 U503 Precise voltage regulator

PC817 U502 Photoelectric coupler

FSDH321 U501 Power switch IC

PT6961 U401 Control panel IC

HS0038B3V U402 Remote control receiver

KA4558 U603

TDA1308 U604 Headphone amplifying

NJM4558 U209

HY57V641620HGT-7 U208 SDRAM

24C02 U202 EEPROM

MT1389 E version U201 Decode chip

AM5888S U301 Servo drive

29LV160BE U214 FLASH

Operational amplifier (MIC

amplifying)

Operational amplifier (audio

amplifying)

-13-

SectionTwoUnitCircuitPrinciple

3.2.1Introductiontolaserhead

1.Functionintroductiontolaserheadflatcableisshownasthefollowingtable:

Pin Name

1 F- Input loader 2.52 2.34 0.46

2 F+ Input loader 2.49 2.49 0.93

3 T+ Input loader 2.53 2.51 0.94

4 T- Input loader 2.58 2.51 0.93

5 C Input MT1389 2.2 2.25 2.04 Disc data signal

6 D Input MT1389 2.2 3.2 2.04 Disc data signal

7 IOA Input MT1389 0.01 3.2 3.21

8 RF Input MT1389 2.21 2.53 1.28 The sum of disc data signal

9 A Input MT1389 2.17 2.22 2.04 Disc data signal

10 B Input MT1389 2.19 2.27 2.04 Disc data signal

11 F Input MT1389 2.07 2.44 2.03 Supplementary signal used in trace

12 GND Ground 0.01 0.01 0 Grounding

13 V20 Input loader 2.04 2.06 2.03 Reference voltage

Signal flow

direction

DVD disc CD disc No disc Function description

Focus error signal is added to two sides of

pick-up focus coil

Trace error signal is added to two sides of

pick-up trace coil

Disc identification signal, CD is 3.3V, DVD

is 0V

14 Vcc Input loader 5.04 5.04 5.02 Supply voltage for loader

15 E Input MT1389 2.06 2.45 2.03 Disc data signal

16 Blanking haning in air 0.01 0 0 unused

17 VR-CD Input loader 0.21 0.01 0

18 VR-DVD Input loader 0.01 0.2 0

19 LD-CD Input loader 0.09 2.1 0 CD laser power control signal

20 MDII Input MT1389 0.21 0.2 0 CD and DVD laser power monitoring signal

-14-

Through the handling inside loader, make

sure MD11 is 180mV when reading CD

Through the handling inside loader, make

sure MD11 is 180mV when reading DVD

Pin Name

21 HFM Input loader 5.04 5.04 5.02

22 Blanking unused 0.01 0.1 0

23 LD-DVD Input loader 2.21 0.1 0 DVD laser power control signal

24 GND unused 0.01 0.01 0 Grounding

Signal flow

direction

DVD disc CD disc No disc Function description

High frequency overlapping signal produces

laser with different wave length inside

loader

Note:1.WhenreadingDVD,thereareonlyA,B,C,Dsignals.

2.WhenreadingCD,thereareA,B,C,D,E,Fsignals.

3.RFO=A+B+C+D.

4.Focuserrorsignal=(A+C)-(B+D)Traceerrorsignal=E-F.

2.Workingprinciple

(1)Lasertube:wavelengthofloaderDVDlaserdiodeis650nm,wavelengthofCDlaserdiodeis

790nm,thewavelengthwhichiswithin370nmand750nmisvisiblelight,thelaserinthecourseof

readingDVDdiscisvisiblelight,andthatwhenreadingCDdiscisinfraredlight.

(2)Principleaboutlaserheadpicksupsignal:laserbeamprojectsontodisc,whenlaserbeam

focusprojectsontodiscvertically,laserbeamwillproducereflection,reachonlightsensorthrough

reflectionloopandconverseintoelectronicsignalthroughphotoelectriccell.Forthereflectionloop

producedinnonpitinformationareaandpitinformationareaindischasdifferenceandreflectsinto

differentpositionoflightsensor,photoelectricdiodeindifferentpositionsonlightsensorwillproduce

differentsignalstoprocessallsignalsonlightsensorandthenproducedigitalsignals.

(3)Focus,tracecoil:whenlaserheadisreadingsignalsnormally,informationsideshouldbeinthe

focusoflaserbeam,becauseoffactorsofdiscerror,highspeedrotationandmachineerror,itis

unavoidablethatlaserbeamfocusdeviatesfrominformationfacetoproducephenomenaoforbitboas

andrefocusing.Focus,tracecoilisaddedonloadertoadjustlaserbeamtomakeitcorrectlyfocusin

informationarea.

(4)FormationofRsignal:whendiscreadingisnormal,lightsensorwillhave160MV,vagueand

eyepatternwaveformwhichisaddedonA,B,C,Drespectively,andoutputRsignalfromFROpin

F

F

afterbeingoverlappedbyadderinsidelightsensor,thefrequencywhenreadingDVDdiscismuch

higherthanthatwhenreadingCDdisc,outputamplitudeisabout1.4V.

-15-

3.2.2Servocircuit

1.ServosystemofthisplayeradoptsSANYOloader+MTKdecodesolution(MT1389E+FLASH

(16M)+SDRAM(64M)),anditsservocircuitismainlycomposedoffrontendsignalprocessing,digital

servoprocessing,digitalsignalprocessingICMT1389EanddrivecircuitAM5888S,inwhichMT1389E

isalsothemaincomposedpartofdecodecircuit.Servocircuitblockdiagramisshownasinthe

followingfigure

Feedelectricmachine

Mainaxiselectricmachine

3.2.2.1:

Xs301

ABCDEFRFO

Mainaxiscontrol
detectcircuit

Switchcircuit

APCcircuit

TK-15

TK+16

FC+14

FC-13

SL+17

SL-18
SP-12

SP+11

Am5888

LOAD+

LOAD-

23

26

4
7

1

6

FOSO

FMSO
TRSO

DMSO

TRCLOSE
TROPEN

10

Discin/out

9

electricmachine

IOA

MD11

LDO2
LDO2

MT1389

U201

Figure3.2.2.1Servocircuitblockdiagram

2.Workingprinciple

Afterpoweronordiscintoproperposition(onloaderframeforgeneralDVDplayers,onPCBboard

belowdoorforPDVDplayers),loaderlaserheadbeginsreset,afterlaserheadreachestoproper

position,detectswitchwillgiveasignaltoMT1389,MT1389beginstooutputfocus,mainaxisandlight

emissionsignals,discbeginstorotate,laserheadbeginstorecognizediscinformationandjudge

whetherdiscisCDorDVDaccordingtodiscinformationtofacilitatetooutputlevelfromIOApin,control

discswitchcircuitandlaserheadPDICtomakecorrespondingacts.Atthesametime,MT1389also

adjustslaserpoweroutputthroughlaserpowercontrolcircuit.

Afterloaderreadsdiscinformation,A,B,C,D,EandFsignalareformedthroughphotoelectric

conversiontoMT1389(DVDonlyhasA,B,C,Dsignals)andR

MT1389MT1389

ofrespectively,afteramplifyingprocessingofpre-amplifierinside,nowsignalsare

dividedinto2waysinside:onepart,throughsummationamplifyingandsubtractioncircuit

inside,producesservoerrorsignal,afterdigitalservosignalcircuitprocessing,forms

MT1389

MT1389

Fsignalandoutputfrompin2~11,18,19

-16-

Correspondingservocontrolsignals,outputsFOO,TRO,DMOandFMSOservocontrolsignalfrompin

42,41,37and38ofrespectivelyandthensendtoservodrivecircuitfordriveamplifying

MT1389

throughtheintegrationcircuitcomposedbyresistorandcapacitorandbringalongfocuscoil,tracecoil,

mainaxiselectricmachineandfeedelectricmachineafterdriveamplifying.

Amongthese,focusand

traceservoareusedtocorrectobjectivepositionaccurately;feedservoisusedtobringalonglaser

headtomakeradiallarge-scalemovewhichbelongstothepreliminaryadjustmenttolaserheadposition;

andmainaxisservoisusedtocontrolmainaxiselectricmachinetomakeitreadsignalsinmeansof

constantlinearvelocityandbringalongdisctorotate.AfterprocessingofamplificationbyVGAvoltage

controlamplifierandequalizationfrequencycompensationinsideMT1389,anotherpartofsignalsare

changedintodigitalsignalsthroughinternal A/Dconverter.WhenloaderisreadingCD/VCDsignals,

thesesignalsareconductedEFMdemodulationinsideMT1389,andthenoutputtedtolatterstageforAV

decodingafterfinishingCIRC(Cross-InterleavedReed-SolomonCode)errorcorrectioninside.When

loaderisreadingDVDsignals,thesesignalsareconductedESMdemodulationinsideMT1389,andthen

senttolatterstagefordecodingafterfinishingRSPCerrorcorrectioninside.GeneralDVDplayershave

adiscin/outcircuittocontroldisctraydoorin/outactstoreachthepurposeofmakingdiscinandout.

ForPDVD,weadoptmanualdiscin/outmeansandwecanjudgewhetherdiscintoproperposition

throughdetectswitch.

3.Explanationtoservoterms

(1)FOO:fordiscmakedifferences,andwhenrotatingdiscmayprobablymoveupwardsor

downwardsslightlytomakethefocusoflaseremittedbylaserheadcannotjustlyfallondatapitofdisc,

nowfocuspointofobjectivelensisrequiredtoadjusttomakefocusaimatdatapitexactly.Theactsare

mainlytomakeobjectivelensmoveupwardsanddownwards.

(2)TRO:datainformationissavedindiscinformoftracks.Whendiscisrotating,discdeviationwill

produce,nowlaserheadisrequiredtoadjust.Inthisprocess,objectivelensmakesforwardand

backwardmovementwithsmallmovingrange.

(3)FMO:similartoactsoftrace,theactsoffeedarelargerthanthoseoftrace.Feedconductsa

largescalemovementfirstly,andthentracemovesslightlyinthisrange.Feedmovesforawhile,and

doesnotmoveforanotherwhile;buttracemovesallthetime.Feedisroughadjustmentandtraceisfine.

Andactsareobviouswhenpoweronandselectingtrack.

(4)DMO:itisthetopthatholdsupdisc.Itsrotationspeeddecidesthatofdisc.Itsrotationis

generatedbyanindividualDCelectricmachine,inwhichrotationspeedofDVDistwiceoverthatofCD.

-17-

3.2.3Open/closedrivecircuit

1.Open/closedrivecircuitisshownasinthefollowingfigure3.2.3.1:

27K

TRSO

FC+
FC­SP­SP+
LOAD+

LOAD­TK-

TK+
SL+
SL-

AM5888S

Figure3.2.3.1Open/closedrivecircuitdiagram

STBY

V1P4

FMSO

TRCLOSE

TROPEN

DMSO

FOSO

2.Workingprinciple:whenthemachineisreadingdiscsnormally,pin6,7,910ofAM5888Sareall

0V.AfterOPENbuttonispressed,pin6inputshighlevel,pin10LOAD+outputshighlevel,electric

machinerotatestoperformOPENacts.Whenclosing,pin9LOAD-outputshighleveltopin9through

R203

R202

R314

10K

R204

15K

MT1389E

R201

10K

27K

electricmachinetoformloop,electricmachinerotatesreverselytoperformCLOSEacts.Afterclosingto

properposition,allpinsarealllowlevel.ServodriveprincipleisthesamewiththedriveofD5954

scheme,sowewillnotdescribehere.

3.2.4Laserpowercontrolcircuit

Laserpowercontrolcircuitisshownasinthefollowingfigure3.2.4.1:

LDO-AV33

4.7R
TC302

47uF/16V

LDO2

Q301

2SB1132-S

20/21

MT1389E

Q302

2SB1132-S

LDO1

XS301

R301

23

MD1

20

19

TC303
47uF/16V

4.7R

R302

Figure3.2.4.1Laserpowercontrolcircuitdiagram

LDO-AV33

-18-

2.Workingprinciple

Pin20/21ofMT1389islaserpowerdetectsignalinputpin,pin21isDVDlaserpowerstrong/weak

detectsignalinputpin,pin23isVCDlaserpowerdrivecontroloutputpin,pin22isDVDlaserpower

drivecontroloutputpin.

WhenreadingVCDdisc,laserpowerbecomesweak,voltageofMDIIpindecreases,voltage

decreaseofpin23ofMT1389makesvoltageofpin19ofXS301increasetoreachthepurposeofraising

laserpower.Whenlaserpoweristoostrong,voltageofMDIIpinincreasestoleadtovoltageofpin23of

MT1389increasetomakevoltageofpin19ofXS301decreasetoreachthepurposeofreducinglaser

powertoformanautopowercontrolcircuit.

WhenreadingDVDdisc,pin21isdetectsignalinputpin,pin22isdrivecontrolinputpin,andthe

workingprincipleisthesamewiththatwhenplayingVCDdisc.

3.Keypointvoltage(unit:V)isshownasthefollowingtable:

Location number Read DVD disc Read VCD disc Location number Read DVD disc Read VCD disc

V103_E 2.9V 3.2V V104_B 3.2V 2.2V

V103_B 2.2V 3.2V V104_E 3.2V 2.9V

V103_C 2.2V 0 MT1389_20 0.2V 0.2V

V104_C 0 2.2V

3.2.5CD/DVDconversioncircuit

1.CD/DVDconversioncircuitisshownasinthefollowingfigure3.2.5.1:

AVCC

Q305
3904-S

R309

10K
R311

10K

R310

100K

IOA

MT1389E

XS301

17

2SK3018-S

18

R308
100K

Q303

Q304

2SK3018-S

Figure3.2.5.1CD/DVDconversioncircuitdiagram

-19-

2.Workingprinciple

Afterloadingdiscintheplayer,IOAportofMT1389isdefaultedhighleveltomakeQ305saturation

onandformlooptogetherwithCDlaserpowercontrolcircuitonCD.Atthesametime,IOAalsogoesto

loaderPDICtoswitch,discbeginstorotate,whenservomanagementsystemrecognizesthatthedisc

inplayerisnotCDdisc,IQApinoutputslowleveltomakeQ305cutoffandmakeQ303on,andform

looptogetherwithDVDlaserpowercontrolcircuitonloadertoperformdiscreadingacts.Afterdisctray

dooropens,IOAkeepsthestatebeforeopeningdisctraydoor.Iftheplayercannotrecognizewhichdisc

itis,IQApinwillswitchcontinuouslyuntilreadingdiscorsystemjudgesthatthereisnodisc.

Note:Q303andQ304areMOStube

3.Keypointvoltage(unit:V)isshownasthefollowingtable:

Q305 Q303 Q304

State

DVD disc 0 3.86 0 3.81 0.18 0 0 0 0 0

VCD disc 0.64 0.1 0 0 0 0 3.27 0.18 0 3.3

Base

electrode B

Collector C Emitter E

Grid

electrode G

Drain

electrode D

Source

electrode S

G D S IOA

3.2.6Mainaxiscontrolcircuit

1.Mainaxiscontrolcircuitisshownasinthefollowingfigure3.2.6.1:

R328 10K

SL+
SL-

LIMIT#

SP+
SP-

1R

680K/1%

Xs306

6P2.0mm

1
2
3
4
5
6

104

C313

R321

R319
150K

Figure3.2.6.1Mainaxiscontrolcircuitdiagram

2.Function:discisalwaysinhighspeedrotationinthecourseofdiscreading,whenyouneedto

openthedoortochangedisc,MT1389stopsthepositivedirectiondrivesignalwhichisgiventomain

DV33

R320

150K

R318

R315
330

C307

LIMIT

222

R317

680K/1%

C308
101(DNS)

C309
222

R331

0R

OPO

ADIN

OP­OP+

V1P4

axisdrivecircuit,forthefunctionofinertiadiscisstillrotating.Ifdiscoutorderisperformedatthistime,

discwillbeabrasivelydamaged.Therefore,machinemustbebakingtomainaxis,thatwhetherdischas

stoppedrotatingandwhetherdiscisreversing,decodechipofthemachinecannotrecognize.Soamain

-20-

Axiscontrolcircuitisaddedtomakedecodechipcaneffectivemonitorthatwhetherdischasstopped

rotating.

3.Workingprinciple:MT1389hasacomparatorinsidecomposedofoperationalamplifier,inwhich

OP+isthein-phaseinputendofoperationalamplifier,OP-isreverseinputend,OPOisoutputend,

whenplayingdiscnormally,forelectricmachineispositivedirectionrotating,voltageofOP+ishigher

thanthatofOP-,voltageofOPOismorethan1.4V.Whendiscoutisneeded,mainaxisdrivesignal

stops,forelectricmachineispermanentmagnetic,wheninrotating,inducedelectromotiveforce

producesintwoendstogivetodecodechipthroughR320,R319samplingtomakeOPOoutputless

than1.4VvoltageandtransmittoinputpinofMT1389ADINthroughR331.WhenADINishighlevel,

mainaxisdriveoutputendhasnotanydrivesignaloutput,whenADINislowlevel,MT1389outputsa

reversingdrivesignaltomainaxisdrivecircuittomakemainaxiselectricmachinespeeddown.Thus

circularworkinggoesonuntilmainaxisstopsrotating.PDVDismanualdiscoutmeans,soafterdiscout,

discisstillrotating,butwillstopveryson.

4.Keypointvoltage(unit:V)isshownas thefollowingtable:

Key point Position Normal working voltage (V) Volateg change when disc out (V)

SP+

SP-

OP+ Pin 36 of MT1389 1.38

OP- Pin 35 of MT1389 1.53

OPO Pin 34 of MT1389 2.44

ADIN Pin 47 of MT1389 2.44

DMSO Pin 4 of AM5888S 1.42 1.42

VIP4 Pin 30 of MT1389 1.41 1.41

Pin 11 of AM5888S, pin 5 of
XS307

Pin 12 of AM5888S, pin 6 of
XS307

3.79

1.38

3.79→0.70→1.80

1.38→3.40→1.80

1.38→3.10→1.80

1.53→3.08→1.98

2.44→0.40→2.50

2.41→0.41→2.44

3.2.7Decodecircuit

1.Decodecircuitblockdiagramisshownasinthefollowingfigure3.2.7.1:

2.Workingprinciple:thisdecodecircuitismainlycomposedofMT1389,SDRAMandFLASH.

Workingconditionofdecodecircuithas:

(1)Reset:refertoresetcircuitworkingprinciplefordetails.

(2)Clock:thissystemadopts27Mexternalclockinput,andproducesclocksignalrequiredby

systeminsidethroughinternalfrequencydoublingcircuit.

-21-

PWR

SDCLK

SDCKE

DCS

DRAS

SWE

SDRAM

DQM0

DQM1

DQ0~DQ15

MA0~MA11

FLASH

PRD

PCE

A0~A20

AD0~AD7

URST

Reset
circuit

MT1389

SDA
SCL

EEPROM

24C02 27M

Figure3.2.7.1Decodecircuitblockdiagram

Clock

V18

1.8V
voltage
regulating

3.3V
voltage
regulating

(3)Power:decodechipadoptstwpgroupspowersupplyof3.3Vand1.8V,inwhich1.8Vmainly

supplypowerforinternallogiccontrolcircuitandwecallitcorevoltage.

Afterpoweron,resetcircuitperformsresettoMT1389built-inCPU(8032)andFLASH,decodechip

outputsresetsignalatthesametimeandperformsresettoothercircuit.Aftersystemreset,itfirstly

sendsoutreadsignaltoFLASHtoreadoutinformationsavedinFLASH,themachinedisplayspower-

onpicture,servosystembeginstoworktocheckwhethermachineclosesdoortoproperpositionand

whetherdetectswitchhasbeenclosed,ifnot,thedoorcloseactionisperformed.Afterdetectswitchof

doorisclosed,themachinebeginstoperformpreparationsofdiscreadingandperformspaneldisplay

atthesametimeofworking.

Playbackprocess:laserheadpicksupdiscsignalfromdisc,afterservosystemprocessing,then

sendtodecodecircuitfordecoding,signalafterbeingdecodedissavedinSDRAMforthemoment.

Whenmachineneedstoreplaysignal,decodecircuitcallsinformationinsideSDRAMtoperformD/A

conversionandthenoutput.

Userinformationstorage:informationcontentsetbyuserissavedinsideEEPROM,ifuserdoesnot

refreshorresetthisinformation,itwillsavedinICpermanently.

Audio,videooutputcircuit:atpresent,MT1389allintegratesvideoD/Aconverter,MT1389Einside

integratesaudioD/Aconverter,manufacturesselectaccordingtotheirownneeds.Pleasereferto

circuitprinciplediagramandaudiocircuitexplanationfordetails.

-22-

3.2.8Resetcircuit

1.Resetcircuitisshownasinthefollowingfigure 3.2.8.1:

DV33

R251
TC225
106

1N4148

D202

2SC1815-YS

R250

1K

R299
47K

Figure3.2.8.1Resetcircuitdiagram

2.Workingprinciple:afterpoweron,voltageofDV33increasesto3.3V,mainchippowersupplyis

normal.Now,voltageofTC225toDV33cannotchangesuddenlytomakebaseelectrodeofQ221has

currentflowin,Q221issaturationon,URSTislowlevel.DV33chargesTC225intwopathsthrough

10K

Q221

33R

R300

C293
104

URST#

emitterjunctionofR299andQ221makenegativepolevoltageofTC225decreaseslowly.Whenthis

voltagedecreasesbelow0.7V,Q221cutsoff,URSTchangesintohighlevel,theprocessforURSTfrom

lowtohighiscalledeffectiveresetsignaloflowlevelbyus.Afterpoweroff,voltageofDV33decreases,

TC225decreasestogetherwithDV33voltage,D202performssugedischargeandclampingtoTC225.

3.Keypointvoltage(unit:V)

Q221_Bislowlevelwheninnormalcondition,atthemomentofpoweron,itdecreasedto0Vfrom

3.3Vgradually.

Q221_Cishighlevelwheninnormalcondition,atthemomentofpoweron,itincreasesto3.3Vfrom

0V.

3.2.9Videocircuit

1.Videosignalflowchartdiagramisshownasinthefollowingfigure:

2.Workingprinciple:MT1389Ehasbuilt-invideoD/Aconversioncircuit,videooutputhasR/B/G

3.2.9.1

Y/Pb/PrY/Cb/CrCVBSY/Coutputmode,inwhichR/B/GY/Pb/PrY/Cb/CrY/Ccannotoutputatthe

sametimeandneedtheswitchthroughsoftware.CVBSisaseparateoutputmode,4-pathvideosignal

outputtedbyMT1389,throughvideofilteringclamping,outputtoAVboard.

-23-

VIDEO-SY

VIDEO-SC

S-Video

Jk703

AVoutputboard

171

170

168

164

R/Cr

B/Cb

G/Y

CUBS

L225

L226

L228

L227

B/Cb#

D214

D213

D212

R225

R706

VIDEO-RV

VIDEO-B/U

VIDEO-G/Y

VIDEO-CVBS

Jk703

CVBS-Video

5

9

7

11

VIDEO-RV

VIDEO-B/U

Xs206

VIDEO-G/Y

VIDEO#

5

9

XS701

7

11

Pr

Pb

Componentvideo
outputterminal

Y1

VIDEO#

SCART

Figure3.2.9.1Videosignalflowchart

Shownasinthefigure3.2.9.2,capacitorC287,C288andinductorL227composealow-passfilter

tofilterhighfrequencydisturbancesignalexceptusefulsignal;dualdiodeD211composesalimiter

circuit,knownfromfeaturesofdiodethatthemaxamplitudeofcompositevideosignalCVBScannotbe

over5.7,andthemixcannotbelessthan-0.7,thusthehighvoltagesignalfromTVsetcanbeavoided

burningdowntheplayer.

VCC

L227

C287
47pF

1.8uH

C288
47pF

VIDEO_CVBS

VGND

CVBS

R248

75R

VGND

Figure3.2.9.2Videooutputcircuit

3.2.10Audiocircuit

1.Audiosignalflowchartisshownasinthefollowingfigure3.2.10.1:

186

184

SCALK

MIC_IN1

MIC_IN2

AL

AR

TOheadphone

R266

OK

R267

U209

1

7

2

6

Lt

Rt

L705

L706

Jk601

U601A

HR

7

U604

HL

1

67

U601B MICholder

13

14

XS206

Audioterminal

HR

6

HL

2

31

L#

R#

D211
1N4148*2

XS701

XS702XS602

MICboard

L

R

SCART

159

IEC958

R223

SAPDIF

3

XS206

SAPDIF

3

Figure3.2.10.1Audiosignalflowchart

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XS701

SAPDIF

Coaxial

Optical

2.Workingprinciple:MT1389Ehasbuilt-inaudioDACconversioncircuit,whichstimulatesaudio

signalandoutputsfromdecodechipdirectly,throughaudioamplifyingandfilteringcircuit,outputsaudio

signalsdirectly.AudioL,Rchannelsignalsaredividedintotwoways:onewayoutputstoAVboardand

theotherwayoutputstoheadphoneamplifyingcircuitonMICboard,shownasinthefigure3.2.10.2,this

modelusestwochannels.

R2111

30K

C2111 100pF

CH-R

TC246

10uF/16V

+A9V

7

-A9V

Figure3.2.10.2Amplifyingcircuitfigure

U209B

4580

R2117

4.7K

6

5

AGND

R2123
10K

C2117
102

R

TC240

10uF/16V

89_AR

3.ExternalKaraokesignalinputandoutput

Afterbeingamplified,MICsignalsinputtodecodechipforA/Dconversioninside,throughechoand

volumeprocessingcircuit,andoutputtogetherwithaudiosignalsL/RtoreachthepurposeofKaraoke.

3.2.11Mutecircuit

1.Mutecircuitisshownasinthefigure3.2.11.1:

VCC

Q211
1015

VMUTE

R273

100K

89V33

E

TC220
100uF/16V

-9V

2.Workingprincipleofquietingcircuit

Whentheplayerisworkingnormally,showninthefigure3.2.11.1,MT1389Eoutputsanalogaudio

signal,andalowlevelsignalto

VMUTEatthesametimetomakeQ211on,BelectrodeofQ211isabout

R278
1K

R274

G

1K

E

R276
10K

AGND

Figure3.2.11.1Mutecircuit

2SC1815-YS

R275
10K

K

C296

105(DNS)

H

Q212

AGND

R277
10K

Q213
1015

I

D203
1N4148

MUTE-1

J

Q214
1015

D204

1N4148

M

AGND

R279
10K

TC221

100uF/16V

L

VCC

2.7V,collectorelectrodeofQ211isabout3.3V,soQ212isalsoon,voltageofBelectrodeisabout0.7V,

voltageofQ213Eelectrodeisneartozero,Q213cutsoff,MUTE1isnegativevoltage,whichisadded

－

tobaseelectrodeofmutetubeofaudiooutputendtomakemutetubecutoff,andaudiosignaloutputs

afterbeingamplifiedby4558.WhenpressingMUTEbuttononremotecontroller,MT1389hasnoaudio

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