BBK DV717SI, DV721SI Service Manual

DV717&DV721SISI

servicemanual

Catalog

ChapterOneAboutMaintenance 1

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

2

2

2

2

2

2

2

3

3

3

ChapterTwoFunctionsandOperationInstructions

2.1Features

2.2ControlButtonLocationsandExplanations

2.2.1FrontPanelIllustration

2.2.2RearPanelIIIustration

2.2.3VFDDisplayWindowIllustration

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

7

7

7

7

7

8

9

2.4.6Karaoke

9

2.4.7Preference

2.4.8Parentalcontrol

2.4.9Initialsetup

2.4.10Resttodefaults

2.4.11Exit

2.5Specifications

ChapterThreePrincipleandServicing

SectionOnePrincipleofthePlayer

3.1.1Blockdiagramoftheplayer

3.1.2PCBboardblockdiagramoftheplayer

3.1.2PCBboardblockdiagramoftheplayer

3.1.3IntroductiontoICoftheplayer

SectionTwoUnitCircuitPrinciple

3.2.1Laserheadpinintroduction

10

10

10

10

11

11

12

12

12

12

13

14

15

15

3.2.2Discidentificationcircuit

3.2.3Laserpowercontrolcircuit

3.2.4Resetcircuit

3.2.5Clockcircuit

3.2.6Discin/outcircuit

3.2.7Mainaxisbraking circuit

3.2.8Mutecircuitandpower-offquietingcircuit

3.2.9Servocircuit

3.2.10Decodecircuit

3.2.11Videocircuit

3.2.12Audiocircuit

3.2.13Powercircuit

3.2.14MICcircuit

3.2.15Headphonecircuit

3.2.16panelcontrolcircuit

16

17

18

19

19

20

22

23

26

27

28

30

31

32

32

3.2.17AVoutputcircuit

SectionThreeServicingCases

3.3.1Servicingcases

3.3.2Troubleshootingflowchart

33

35

35

38

SectionFourWaveformdiagram

57

SectionFiveFunctionIntroductiontoIC

3.5.1functionintroductiontoMt1389

3.5.2functionintroductiontoFLASH

3.5.3functionintroductiontoSDRAM

3.5.4functionintroductiontoD5954

3.5.5functionintroductiontoCs4360

3.5.6FunctionintroductiontoCS5340

3.5.7FunctionintroductiontoLM1117MP-1.8

3.5.8FunctionintroductiontoHS0038A2

3.5.9Functionintroductionto4558/TDA1308

3.5.10FunctionintroductiontoU501(FDSH321)

3.5.11Functionintroductiontoncp1200

3.5.12FunctionintroductiontoU503(LM431A)

3.5.13FunctionintroductiontoU502

65

65

75

75

77

78

78

79

79

80

80

81

81

82

ChapterFourDisassemblyandAssemblyProcess

ChapterCinquePCBboard&Circuitdiagramt

SectionOnePCBboard

SectionTwocircuitdiagram

ChaptersixBOMList

DV721SIServiceManual

7.1.1Features

7.2.1PCBboardblockdiagramoftheplayer

7.3.1MICcircuit

7.3.2Controlpanelcircuit

7.3.3Powercircuit

7.4.1Troubleshootingflowchart

83

84

84

93

100

110

110

111

112

112

113

117

7.5.1PCBboard

7.5.2circuitdiagram

120

127

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 -

ChapterTwo

FunctionsandOperationInstructions

2.1Features

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

Brand-newAVEffects

1.CompatiblewithDivX,MPEG4discstoproducewonderfulpictures.

2.108MHz/12bitvideoDAC,withmorevividandbrilliantpictures.

3.Progressive-scanvideooutputstoeliminatetheflickershardlyouvercomebyinterlacingscan
andthereforeyoureyesightwillbewell-protected.Atthesametime,thepicturesdeflnltionIssharply
enhancedandthepictureswillbefiner,smootherandstabler

4.Brightness,chromaandcontrastadjustmentfunctionstorenderyoureyesmorecomfortable.

5.DigitalechoKaraoketoenableyoursingingeasier.

6.CompositeVideo,S-VideoandComponentVideooutputs.

7.Bullt-InDolbyDigitaldecoder,separate5.1ChOutputs.

8.Dolbyoutputfor2channel(DOWNMIX).

9.DVD-Audiodecodingoutputtoreproduceoriginalandrealisticsoundeffects.

HighQualityDigitalAudio

1.OpticalandcoaxialoutputsforDigitalaudio.

2.DTS,DolbyDigital,PCMDigitalaudiooutputstosatisfytheFans’Ssacousticrequirements.

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

2.2.1 FrontPanelIllustration

-4-

2

3

5

4

6

1

POWERswitch

2

Disctray

3

OPEN/CLOSEbutton

4

PLAYbutton

2.2.2RearPanelIIIustration

1

MixedAudioOutjack

2

5.1CHAudioOutjacks

3

DigitalAudioCoaxialOutjack

4

DigitalAudioOpticalOutjack

7

5

PAUSEbutton

6

STOPbutton

7

IRSENSOR

8

Displaywindows

5

VideoComponent/YPbPrOutjacks

6

S-Video

7

VideoOutjack

8

SCARTOutjack

8

8

2.2.3VFDDisplayWindowIllustration

6 119

1

DVDdisc

2

PBC

3

ChapterorTrack

4

Playbacktime

ＳＶＣＤ

MP3

7 8 10

2

ＰＢＣ

ＡＬＬ

5

6

7

8

3

DTS

VCDCDSVCDDisc

、、

MP3Disc

Playbackstatusindication

2.2.4RemoteControlIllustration

4

5

12

9

PLAY

10

Repeat

11

PAUSE

12

DOLBYDigital

-5-

10

12
13
14

1

[]

1

2
3
4

5

6

15
16

17
18

19

Button

Openorclosethedisctray.

2

LANGButton

Changetheaudiolanguageoraudiochannel

3

MEMORYButton

Savetheplayingpointorjumptothesavedpoint

7

8
9

11

20

22
23

24
25

26

27

28

21

4

DISPButton

Displayorhidediscinformation.

5

NUMBERButtons

6

BROWSEButtons

switchnewuserinterface.

7

CURSORButtons

8

SETUPButton

DisplayDVDmenuoropen/closePBC.

20

OKButton

21

CancelButton

22

ZOOM+/-Button

Zoomin/outthedisplayedframe.

23

[]

Button

Playorpauseplayback.

24

[]

Button

Fastforwardplay.

[]

25

Button

Stopplayback.

29

FunctionSetup.

9

[]

Button

Open/closethevirtualkeyboardfunction.

10

KARAOKEButton

Karaokeoperationmenu.

11

[]

Button

Fastbackwardplay.

[]

12

Button

Skipbackward.

13

PEPEATButton

Repeatplay.

14

A-BButton

Repeattheselect.

15

[]

Button

Pressoncetostandby,Presstwicetoplay.

16

SUBTButton

26

[]

Button

Skipforward.

27

CAPTUREButton

Settheplayedimageasthepower-onlogo.

28

VOL+/-Button

Increase/decreasevolumelevel.

29

MUTEButton

Pressoncetomute,twicetoturnoff.

Changesubtitlelanguage,SwitchJPEG

displaymode.

17

Q-PLAYButton

Skiptheadvertisement/warningandplaythe

DVDdirectly.

18

ANGLEButton

Changecameraangle.

19

MENUButton

-6-

2.3Accessories

AUDIO/VIDEOCORD
REMOTE
AAASITEBUTTERIES
WARRANTYCARD
USERMANUAL
KARAOKEDISC

1PCS
1PCS

2PCS
1PCS
1PCS
1PCS

2.4FUNCTIONSETUP

2.4.1FunctionSetup

1.Pressthe[SETUP]buttonandthescreen

displaystheselectionmenuoffunctionsetup.

IS

LB

L.

Off

0
0
0
0

Setupmenu
DVDmenu
Soundtrack
Subtitle

AUTO
PAL
NTSC

Off

Language
Image
Sound
Playback
Karaoke
Preference
Parentalcontrol
Initialsetup
Resettodefaults
Exit

2.Pressthe[CURSOR]buttontoselectthemenu

tobeenteredandpressthe[OK]orbuttonto
confirm.Orpressthe[CURSOR]buttontoExit
itemandthenpressthe[OK]buttontoexit

3.Press[UP/DOWN]arrowtoselectthedesired

itemyouwanttosetandpress[OK].

Forexample,press[UP/DOWN]arrowsto
selectIMAGEandpress[OK].TheImagesetting
pageappearsonthescreen.

TVsystem
TVscanmode
Videoout.
TV

format
Sharpness
Gamma
Brightness
Contrast
Hue
Saturation

AUTO

S-Vid.

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:Tosetthepreferencediscmenu

langwhenplaying.

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,

◆

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

Default:Off

◆

Russian
English
Ukrainian

Russian,English,

2.4.3Image.

LB

Off

AUTO
PAL

IS

NTSC

L.

0
0
0
0

TVsystem
TVscanmode
Videoout.
TV

format
Sharpness
Gamma
Brightness
Contrast
Hue
Saturation

AUTO

Com.

-7-

1.TVsystem:Thisitemisusedtothevideo
outputsystemofthisunit.

Optionalsetting:Auto,PAL,NTSC.

◆

Default:AUTO.

◆

2.TVscanmode:Toset
Interlacedscanmode

Optionalsettings:Progressive,Interlaced.

◆

Default:Interlaced.

◆

Progressivescan,
.

3.Videooutput:TosetthetypesofSCARTout

connector.

Optionalsetting:S-Video,Component,SCART,

◆

Default:Component

◆

WhenusingRGBoutputsfromtheSCART

◆

interface,pleaseselectRGB.Otherwise,
pleaseselectCom-ponent,andwhenusingS­VideooutputpleaseselectS-Video.

4.TVnformat:Tosettheaspectratioofthis

player’soutputimage.

Optionalsetting:4:3Pan-scan,16:9letterb.,

◆

16:9TV.

Default:16:9letterb.

◆

5.Sharpness:Used tosetthesharpnessof

videooutputs.

Optionalsetting:High,Medium,Low.

◆

Default:Medium.

◆

6.Gammaemendation:Thisitemisusedtosetup

theGammavalueofvideooutput.

Optionalsetting:High,Medium,Low,Off.

◆

Default:Off.

◆

7.Brightness:Usedtosetthebrightnessofvideo

outputs.

8.Contrast:Usedtosetthecontrastof

videooutputs.

9.Hue:Usedtosetthehueofvideooutputs.

10.

Saturation:Usedtosetthesaturation
ofvideooutputs.

Brightness,contrast,hueandsaturation

◆

adjustingmeans:

A.

Press[UP/DOWN]arrowinthevideosetup
menutoselectthedesireditemyouwantto
adjust.Press[OK]or[RIGHT]buttontoenter
theitem'sadju-stment.

B.

Press[UP/DOWN]arrowtoadjustthesetting
value.

2.4.4Sound

Mixer...
Digitaloutput
Tuning

Configuration
Stereomix
Surr.Mix
Lowband
Channels
Delays
PROLogicII

St.

L+R

off

FSW

Off

1.Mixer...

Configuration
Stereomix
Surr.Mix
Lowband
Channels

Delays

PROLogicII

L+R

FSW.

Auto

A.Configuration:Tosetthisplayer’sDOWNMIX

modetochangemulti-channelaudiointotwo
channelaudio.

Optionalsetting:Stereo,5.1

◆

Default:Stereo.

◆

B.Stereomix:Tosettheoutputmeansofthe

leftorrightaudiowhenplayingaDolbydisc
withseparatetwo-channelaudio.

Optionalsetting:L+R,L,R.

◆

Default:L+R.

◆

C.Surr.Mix:Tosetoutputmeansofthesurround

leftandrightaudiowhenplayingastereodisc.

Optionalsetting:Off,sum,Virt.Surr.

◆

Default:Off.

◆

D.Lowband:selectthechannelthatyoudesire

tooutputlowfrequencysignal.

Optionalsetting:FrontF,CenterC,Surround

◆

Sr,SubwooferSW.

Default:FrontF,SubwooferSW.

◆

E.Channels:

Tosetvolumeofeachindividual

channel.

a.Press[UP/DOWN]navigationkeystoselect

CHANNELTRIM,thenpressthe[OK]or
[RIGHT]navigationkeytoselectENTER
SETUPPAGEasshownintheTVscreen:

FRONT

Volume L

R l r Center SW

20

0 0 0 0 0 0

b.Press[LEFT/RIGHT]navigationkeystoselect

thedesiredchanneltoadjust.

c.Press[UP/DOWN]navigationkeystoraiseor

lowervolumeofthechannel.

d.Press[OK]or[LEFT]toreturntotheMix..

setuppage.

F.Delays:TosetdelaytimeoftheCenter/

Surround/SubwooferSpeaker.

St.

off

Stereo

5.1

surround

-8-

a.Press[UP/DOWN]navigationkeystoselect

DelaysinChannelsitem,thenpress[OK]or
[RIGHT]navigationkeyselectENTERSETUP
PAGEasshownintheTVscreen.

c.Press[OK]or[LEFT]buttontoreturntoAudio

Settingpageafteradjustmentsaredone.

2.4.5Playback

Subwoofer 0cm
Center
LS/RS

0cm

180cm

b.Press[UP/DOWN]navigationkeystoSelect

thedesireditemoupPress[OK]or[RIGHT]
buttontoentersetting.

C.Press[UP/DOWN]navigationkeystoraiseor

lowervolume.

d.Press[OK]or[LEFT]toreturntotheDelaysin

channelssettingpage.

G.PROLogicII:TosetPROLogicIItoONor

OFF.IftheTITLEdoesnotsupportthis
function,werecommendthatyousetthisitem
toAUTObecauseitwouldbecomeworseifthe
processingeffectswereaddedforcibly.

Optionalsetting:Auto,On,Off.

◆

Default:Auto.

◆

2.Digitaloutput:

selecttosettheformatand

streamformofdigitalaudiooutput.

A.SPDIFformat:

Optionalsetting:RAWformat,SPDIF/PCM.

◆

Default:RAWformat.

◆

B.LPCM

Optionalsetting:48kHz16bit,96kHz24bit,

◆

192kHz24bit.

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

a.Press[UP/DOWN]cursorbuttonstoselect

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

Methodtoadjusttonecontrol:

◆

B.Press[UP/DOWN]cursorbuttontoadjust

settingvalue.

DVD
VCD/SVCD
Files
Repeat
Loadeffect

A.P.V

Advertisemenu No

Off
Off

1.DVD:setwhetherinformationofadvertisement
andwarningsatthebeginningofDVDdiscis
skippedtoplaythemoviedirectly.

Alwaysskipads

Optionalsetting:Yes,NO

◆

Default:Number

◆

2.VCD/SVCD:TosetthePCBstatus.

WhenplayingSuperVCDorVCD2.0discs,if

◆

thePCBisON,themenuimagedisplays.

Optionalsetting:On,Off.

◆

Default:On.

◆

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.

◆

2.4.6Karaoke

Microphone
Kar.help
Volume
Echo

Noast.

1.Microphone:switchonoroffmicrophone.

Optionalsetting:On,Off

◆

Default:Off.

◆

2.Kar.help:selectaccompanysingingmeans.

Optionalsetting:ChannelsL,ChannelsR,

◆

ChannelsNoast,ChannelsNovoc.

Default:ChannelsNoast.

◆

3.Volume:

A.Inmicrophonesetuppage,press[UP/DOWN]

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

B.Press[UP/DOWN]cursortoadjustthesetup

value.

Off

On

Off
5
5

-9-

C.Afteradjustmentfinishes,press[OK]buttonto

returntomicrophonesetuppage.

◆

Optionalsetting:On,Off.

◆

Default:On.

2.4.8Parentalcontrol

Microphone
Kar.help
Volume
Echo

On

Noast

4
4

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

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

B.Press[UP/DOWN]cursortoadjustthesetup

value.

C.Aftertheadjustmentfinishes,press[OK]

buttontoreturntomicrophonesetuppage.

Microphone
Kar.help
Volume
Echo

On

Noast.

4

2.4.7Preference

LEDControl
Gr.equalizer
Background
Screensaver

std.

On
Off

On

On
Off

any
Kid
G

Allowed..
Setpassword

Any

PG
PG-13
PGR
R
NC-17

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
Newpassword

Verify

OK Cancel

1.LEDControl:Thisitemisusedsetcolorofled
onthefrontpanel.

Optionalsetting:On,Off.

◆

Default:On.

◆

2.Gr.equalizer:Thisitemisusedtosetwether
theDynamicSpectrumisallowed.

Optionalsetting:On,Off.

◆

Default:Off.

◆

DynamicSpectrumdisplayisinvalidinData

◆

discDVDAUDIOplayback.

、

3.Background:Thisitemisusedtisetupthesort
ofPower-inLogo.

Optionalsetting:Standard,saved.

◆

Default:Standard.

◆

NOTE

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

4.Screensaver:Openorclosethescreensaver
function.

2.4.9Initialsetup

Auto
PAL
NTSC

Press[UP/DOWN]arrowtoselectthe
desiredoptionandPress[OK]buttontoconfirm
it.

NOTE

Inthissetupstate,youmaynotpress[LEFT]
buttontoreturntothepreviousmenu.

2.4.10Resttodefaults

Loadfactorysettings

OK

Cancel

-10-

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

Vidio characteristics

Audio characteristics

Operating voltage
Power consumption

General specification

Operating temperature

DVD-Video,Super VCD,VCD,DivX 3.11,dIVx 4,DivX 5,DivX Pro,XviD,DVD-Audio,
CD-DA, CD+DG, HDCD, MP3,WMA,Kodak Picture CD,JPEG

MIC input

Audio outputs

Video outputs

Analog audio output: Stereo,output 5.1CH
Digital audio output: Coaxial,Optical

Composite,S-Video,component 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 20-20000Hz(±dB)
Signal-to-noise ratio >100(dB)
THD <0.01%

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

Dimensions: 380×258×41.5 mm
Mass: 2 kg

5-35℃

Operating humidity

◆

Designandspecificationsaresubjecttochangewithoutnotice.

◆

Wedonotguaranteethatalldiscscanbeplayedsmoothlyduetothediscquality,discrecording

15-75(no condensation)

qualityandrecordingformat.

-11-

ChapterThreePrincipleandServicing

SectionOnePrincipleofthePlayer

3.1.1Blockdiagramoftheplayer

DV717SIiscomposedofdecodecircuit,servocircuit,audiocircuit,videocircuit,MICcircuitand

powercircuit.Blockdiagramisshownasinthefollowingfigure3.1.1.1:

Remote
control

Microphone

Loader

U205(HCU04)

KEY

U403(HS0038A2)

U6014558

U210(Cs5340)

U302(D5954)

URST#

U401(Pt6961)

Headphone

outputjack

U207(Cs4360)

U201(Mt1389)

U214(FLASH)

U211(SDRAM)

L

R

I C

2

U603

TDA1308

U219
U220
U221

4580

1.8V

U209(LM1117MP-1.8)

H_L

H_R

RT

LS
RS
LFT

CC

LED

LT

A/V

2

I C

OUTPUT
BOARD

2

I C

U202(24LLC02)

Audio
output

Videooutput

Figure3.1.1.1Blockdiagramoftheplayer

-12-

Mainpanel

4973-21

XS401

Xs403

XS402

IR

GND

VFDST

VFDCK

VFDAT

Loaderframe Smallbracket

XS307 Xs306 XS301

Decodeboard

2521S-0

XS201

XS203

Laserhead

XS203

PDAT2

PDAT1

SPDIF

VCC

Y
C

Pr

Y1
Pb

VIEDO

PDAT0

L

R
SL
SR

CC

LFE

+10V

AVboard

7717-0

XS702

Subsidiary

panel

9973-2

CN502

CN502

Powerboard

5DV717-0

AC220V

XS601

MICandheadphoneboard

6717-0

XS603

3.1.3IntroductiontoICoftheplayer

IntroductiontoICoftheplayerisshownasinthefollowingtable:

Semi-finished PCB

name

Power board

5DV717-0

Main panel 4973-2

OK board 6717-0

Decode board

2521S-0

IC model name Location Function

AZ431 U503 Precise voltage regulator

HS817 U502 Photoelectric coupler

FSDH321 U501 Power switch IC

PT6312 U401 Control panel IC

HS0038B3V U402 Remote control receiver

KA4558 U601

TDA1308 U603 Headphone amplifying

NJM4558 U219,U220,U221

HCU04 U205 Phase inverter

HY57V641620HGT-7 U211 SDRAM

LM1117 U209 1.8V voltage regulator IC

24C02 U202 EEPROM

MT1389 C version U201 Decode chip

Operational amplifier (MIC

amplifying)

Operational amplifier (audio

amplifying)

D5954 U302 Servo drive

CS4360 U207 D/A inverter

CS5340 U210 A/D inverter

29LV160BE U214 FLASH

-14-

SectionTwoUnitCircuitPrinciple

3.2.1Laserheadpinintroduction

Laserheadpinintroductionisshowninthefollowingtable:

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

-15-

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

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

High frequency overlapping signal produces

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

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.

3.2.2Discidentificationcircuit

1.Thecircuitschematicdiagramisshownasthefollowingfigure3.2.2.1:

AVCC

R308
100K

V305

R309

10K
R311

10K

IOA

3904-S

R310

100K

R311R0

DQSO

Loader

V303

2SK3018-S

16
17

7

V304

2SK3018-S

Figure3.2.2.1Discidentificationcircuit

2.Workingprinciple:whenreadingCDdisc,theloaderoutputsahighlevel(3.3v)toIOA;when

readingDVDdisc,theloaderoutputsalowlevel(0V)toIOA.

U201

MT1389

114

WhenreadingCDdisc,IOAishighlevel;V304andV305areon;V305collectorelectrodeislow

level;V303drainelectrodeisequaltohangintheair(laserreceiverpipeinsideloaderselectsCD

channel).WhenreadingDVDdisc,IOAislowlevel;V304andV305cutoff;V303ison;V304drain

electrodeisequaltohangintheair(laserreceiverpipeinsideloaderselectsCDchannel).

Note:V303andV304areMOSpipe.

-16-

3.2.3Laserpowercontrolcircuit

1.Thecircuitschematicdiagramisshownasthefollowingfigure3.2.3.1:

A

B

U201

C

Loader

G

D

E

F

Figure3.2.3.1Laserpowercontrolcircuitdiagram

2.Workingprinciple:Pin20ofMT1389isVCDlaserpowerstrong/weaksignalinputcheckingpin;

pin21isDVDlaserpowerstrong/weaksignalinputcheckingpin;23pinisVCDlaserpowerdrivecontrol

outputpinandpin22isDVDlaserpowerdrivecontroloutputpin.

WhenreadingVCDdisc,ifpin20ofU201(MT1389)hasdetectedthatthelaseroutputpowerittoo

strong,afterbeingprocessedbyU201(MT1389)internalcircuit,pin23outputvoltageincreasesandthe

on-statedegreeofV302decreasestomakethevoltagesuppliedforpick-updecreaseandthelight

emittingoflaserheadbecomeweak.Ifpin20hasdetectedthatthelaseroutputpoweristoolow,pin23

outputvoltagedecreases;on-statedegreeofV302increasesandthelightemittingoflaserhead

becomestrongtoreachthepurposeofautomaticallyadjustinglaseroutputpower.

WhenreadingDVDdisc,pin21issignalinputcheckingpinandpin22isdrivecontroloutputpin.

TheworkingprincipleisthesamewiththatwhenplayingVCDdisc.

3.Keypointvoltage(unit:V),shownasthefollowingtable:

Key point Position Voltage when reading DVD Voltage when reading VCD

A Emitter electrode of V301 2.9 3.2

B Base electrode of V301 2.2 3.2

C Collector electrode of V301 2.2 0

-17-

D Collector electrode of V302 0 2.2

E Base electrode of V302 3.2 2.2

F Emitter electrode of V302 3.2 2.9

G one end of R228 0.2 0.2

3.2.4Resetcircuit

1.Thecircuitschematicdiagramisshownasthefollowingfigure3.2.4.1:

Ｕ２０７（ＣＳ４３６０）

U201

Ｕ２１０（ＣＳ５３４０）

Figure3.2.4.1Resetcircuitschematicdiagram

2.Workingprinciple:ThetwoendsvoltageofcapacitorT217cannotchangesuddenly,anodeofthe

capacitorbeginschargingfrom0VandnowtriodeQ204ison.Pin5ofphaseinverterU205(HCU04)

outputportishighvoltageandpin6ofitislowvoltagetoresetchipU201(MT1389)andchipU214

(FLASH).Whenchargeofthecapacitoriscloseto3.3V,triodeQ204cutoff;pin5ofphaseinverter

inputportislowlevel;phaseinverteroutputshighvoltagefrompin6andMT1389resetfinishes.After

resetofMT1389,resetsignalisalsogiventosoundD/AconversionchipCS4360andsoundA/D

conversionchipCS5340Vfortheirresetting.

3.Keypointvoltage(unit:V),shownasthefollowingtable:

Key Point Position Voltage Remark

DV33 (pointA) Cathode of diode VD201 3.3V

Point B Anode of diode VD201 After resetfinishes, 3.3V

Point C Pin 5 of phase inverter After reset finishes, 0V

-18-

After power-off, TC217 dischargecurrent from
this point

After reset finishes, voltage rises from0V up to

3.3V.
After reset finishes, voltage decreases from

3.3V down to 0V.

3.2.5Clockcircuit

1.Thecircuitschematicdiagramisshownasthefigure3.2.5.1.

Figure3.2.5.1Clockcircuit

Note:Elementsmarkedwith“X”symbolarethoseunusedinpractice.

2.Workingprinciple:27MHZclockprovidesworkingclockforsystem.Whenpoweringon,capacitor

C275andC276willgenerateaconcussion,soavibrationoccursoncrystaloscillator.Afterseveral

timesoffeedback,astable27MHZclocksignalisfinallygeneratedoncrystaloscillator.Thefunctionof

phaseinverteristoincreasefeedbackcoefficientandforisolation.

3.Thiscircuitmayprobablycausethesetroubles:powersupplynotconnected;notreaddisc;

colourdistortionofpictureandnocolourofpicture.

Note:DCvoltageofpointAandBis1.47Vwheninnormalworking.

3.2.6Discin/outcircuit

1.Thecircuitschematicdiagramisshownasthefollowingfigure3.2.6.1:

2.Electriccurrentwhendiscin/out

Opendisctray:VCCV306CEelectrodeonLOAD+ElectricmachineLOAD-V308CE

electrodeonR326Ground

Whennotopeningdisctray,pin51and39ofU201(MT1389)arelowlevel.Whenopeningdisctray,

pin51ofU201(Mt1389)sendsahighlevel;V308ison;V308collectorelectrodechangesintolowlevel;

→→

→→→→→

-19-

Figure3.2.6.1Discin/outcircuit

LOAD-changesintolowlevel;V306baseelectrodechangesintolowlevel;V306ison.V306collector

electrodechangesintohighlevelandLOAD+changesintohighlevel.

Closedisctray:VCCV309CEelectrodeonLOAD-ElectricmachineLOAD+V307CE

electrodeonR326Ground

→→

→→→→→

whenclosingdisctray,pin39ofU201(Mt1389)sendsahighlevel;V307ison;collectorelectrode

changesintolowlevel;LOAD+islowlevel;baseelectrodethroughR324andV309islowlevel;V309is

on;V309collectorelectrodechangesintohighlevel;LOAD-changesintohighlevel.

3.2.7Mainaxisbrakingcircuit

1.Thecircuitschematicdiagramisshownasthefollowingfigure3.2.7.1:

Ｒ３１７

Ｒ３２０

２２００ｐＦ

６８０Ｋ

Ｃ３０８
ＤＮＳ

Ｒ３１８

Ｒ３２２
６８０Ｋ

０Ｒ

ＯＰＯ

ＡＤＩＮ

ＯＰ＋

Ｃ３１０
２２００ｐＦ

Ｖ１Ｐ４

ＳＰ－

ＯＰ－

ＳＰ＋

Ｒ３１９
１５０Ｋ

Ｒ３２１

Ｒ３４０

Ｃ３０７

１５０Ｋ

１Ｒ

１Ｒ

Figure3.2.7.1mainaxisbrakingcircuitdisgram

-20-

Theequivalentcircuitisshownasthefollowingfigure:

Ｒ３１７

Ｒ３２０

２２００ｐＦ

６８０Ｋ

Ｃ３０８
ＤＮＳ

３４

４７

３５
３６

１２

Ｄ５９５４

１１

ＭＴ１３８９

A/D

ＤＭＯ

３７

５

ＯＰＯ

０Ｒ

Ｒ３１８

Ｒ３２２
６８０Ｋ

Ｍ

ＡＤＩＮ

ＯＰ－

ＯＰ＋

Ｃ３１０
２２００ｐＦ

Ｖ１Ｐ４

ＳＰ－

ＳＰ＋

Ｒ３１９
１５０Ｋ

Ｒ３２１

Ｒ３４０

Ｃ３０７

１５０Ｋ

１Ｒ

１Ｒ

2.Workingprinciple:

Toprolongtheservicelifeofelectricmachineanddecreasetheinfluenceofstart-upconcussion

currenttothemachine,whenthereisdiscin,thedevelopmentpersonneldesignthemainaxiselectric

machineinrunningstatealways.Eventhough“STOP”buttonispressed,discwillnotstoprunning

immediately.Thuswhenpressing“OPEN”button,abrakingsignalisrequiredtomakethemainaxis

electricmachinestoprunningtofulfillthecompletionofopeningdisctrayinashortperiod.Inthecourse

ofplayback,

Press“OPEN"buttonandmainaxisdrivesignaldisappears.Forthereasonofinertia,themainaxis

electricmachineisstillinrunningstate,andnowtheinducedvoltageachievedbytheinduced

electromotiveforcewhichisgeneratedbyelectricmachine'srunningonsamplingresistorR321and

R340outputsfrompin34throughresistorE319,R320andpin36ofMT1389afterbeingprocessed

insideMT1389andmagnified,thensendstopin47ofMT1389throughR13;afterA/Dconversionand

thecorrespondingprocessinginsideMT1389,aninstantelectricmachinereversalbrakingsignalis

outputtedfrompin37ofMT1389tomakethemainaxiselectricmachinedecreasespeed.When

MT1389detectsthediscstopsrunning,disctraywillopentoensurethatdiscwillnotrunwhendisctray

opens.

3.Keypointvoltage(unit:V),shownasthefollowingtable:

Key point Position Normal working voltage (V)

Voltage change when door is

opened (V)

SP+ pin 11 of D5954, pin 5 of XS303 3.79

SP- pin 12 of 5954, pin 6 of XS303 1.38

OP+ pin 36/B of MT1389 1.38

OP- pin 35/A of MT1389 1.53

-21-

3.79→0.70→1.80

1.38→3.40→1.80

1.38→3.10→1.80

1.53→3.08→1.98

OPO pin 34/C of MT1389 2.44

2.44→0.40→2.50

ADIN pin 47/D of MT1389 2.44

2.41→0.41→2.44

DMSO pin 5 of D5954 1.42 1.42

VIP4 pin 30 of MT1389 1.41 1.41

3.2.8Mutecircuitandpower-offquietingcircuit

1.Thecircuitschematicdiagramisshownasthefollowingfigure3.2.8.1:

MUTE1

A

MUTE2

B

MUTE3

C

VD207
1N4148

VD208
1N4148

VD209
1N4148

VCC

R2101

10K

D E

R2102
1K

TC238
100uF/10V

Q211
1015-S

-9V

MUTEA

+9V

F

R2105

10K

R2103

1K

R2104
1K

G

R2106
10K

k

R21070R(DNS)

Q218

H

1015-S

Q212
2SC1815-YS

AGND

I

VD205
1N4148

J

R2108
10K

VOICE-DET

MUTE-1

Q219
1015-S

L

M

AGND

R2109
10K

VD206
1N4148

VCC

TC235

100uF/10V

Figure3.2.8.1Muteandpower-0ffquietingcircuit

2.Workingprinciple:underthecontrolofICtoMT1389,CS4360sends3mutecontrolsignals,

2

MUTE1,MUTE2,MUTE3frompin28,25and18whichisaddedtomutecircuit.Thegeneratedmute

controlsignalMUTE-1isaddedtothebaseelectrodeofeachswitchingtubeQ205-Q210of6-path

analogchanneltomaketheswitchingtubeandmakeaudiosignalbypassintogroundtoreachthe

purposeofmute.Theworkingmechanismisthatwhennoaudiosignalcomestoacertainpath,CS4360

changesthemutecontrolsignalcorrespondingwiththispathtohighlevel.AfterpressingMUTEbutton,

3-pathmutesignals allchangetohighlevel.

Whenworkingnormally(playingdiscs),onlyonepathsignalofthe3-pathsignals,MUTE1,MUTE2

andMUTE3changesintolowlevel,nowQ211ison.ThecollectorelectrodeofQ211ishighlevel;Q212

isalsoonanditscollectorelectrodeislowlevel;Q218iscutoff;MUTE-1islowlevelandsoundoutputs

normally.

Whenmuting,MUTE1,MUTE2andMUTE3outputtedbyCS4360allchangeintohighlevel.Atthis

time,forthebaseelectrodeofQ211ishighlevel,Q211iscutoffandQ212isalsocutoff.Theemitter

electrodeofQ218changesintohighlevelandalsoison.+9Vvoltageis addedtoMUTE-1through

EmitterCollectorofQ218,theoutputtedhighlevelisaddedtothebaseelectrodeofswitchingtube

Q205~Q210.Theswitchingtubeisonandsoundisbypassedtoground.

-22-

Power-offquieting:whenworkingnormally,becausethereisnoforwardbias,Q219isincutoffstate.

Whenpoweringoff,+9VdisappearsandthebaseelectrodeofQ219changesintolowlevel.For

capacitorTC235dischargeishighleveltotheemitterelectrode,Q219ison.ThedischargeofTC235

makesMUTE-1outputshighlevelandaddtoeachswitchingtubethroughEmitter-CollectorofQ219to

maketheswitchingtubeonandsoundisbypassedtogroundtorealizethefunctionofpower-offquieting.

Power-onquieting:whenpoweringon,VCCisconnectedtopowersupply,voltageofthetwoends

of Tc238cannotchangesuddenly.ThebaseelectrodeofQ211changesintoabout5VandthenQ211is

cutoff,Q212iscutoffandMUTE-1changesintoabout1.68toperformpower-onquietingfunction.

Thefunctionof-9Vvoltageinthefigureistoensurethesecurecutoffofeachswitchingtubewhen

circuitisworkingnormally.

3.Keypointvoltage(unit:V),shownasthefollowingtable:

KEY POINT

NO MUTE

MUTE

INSERT

MICROPHO

NG

Ａ Ｂ Ｃ Ｄ Ｅ Ｆ Ｇ Ｈ Ｉ Ｊ Ｋ Ｌ Ｍ
０．０２ ０．０２ ０．０２ ０．５３ ４．５５ ５．２ ０．８４ ０．１２ －０．１５ －４．２７ －４．２７ ５ ５
５．０２ ５．０２ ５．０２ ５．１８ ５．２３ －３．８６ －３．８７ １．６７ ０．８１ １．６３ －３．８７ ５ ５

０．０２ ５．０２ ０．０２ ０．５３ ４．５２ ５．２ ０．６４ ０．１２ －０．１５ －４．２７ －４．２７ ５ ５

3.2.9Servocircuit

1.DK1005SadoptsSANYO62decoderandMTKdecodesolution(MT1389+FLASH(16M)+

SDRAM(64M)).Theservocircuitismainlycomposedoffrontsignalprocessing,digitalservo

processing,signalprocessingICT1389anddrivecircuitD5954,inwhichMT1389isthemain

componentofdecodecircuitatthesametime.

2.Thecircuitfunctionalblockdiagramisshownasfigure3.2.9.1.

TheExplanationtotheblockdiagram:Afterpoweringonordiscin,discidentificationcircuit

identifiesthediscinsertedintoloader,andjudgeswhetherthediscisCDorDVDtoconductthe

correspondingcontrol.Atthesametime,MT1389adjustslaseroutputpowerthroughlaserpower

controlcircuit.Pin20ofMT1389isVCDlaserpowerstrongness/weaknessdetectingsignalinputpin,

pin21isDVDlaserpowerstrongness/weaknessdetectingsignalinputpin,pin23isVCDlaserpower

drivecontroloutputpinandpin22isDVDlaserpowerdrivecontroloutputpin.WhenreadingVCDdisc,

ifpin20detectslaseroutputpoweristoostrong,outputvoltageofpin23ofMT1389increasesandon-

stateofV302decreasestomakethevoltageprovidedforpick-updecreaseandlightemissionoflaser

headbecomestrong.

-23-

Discin/outelectric
machineand
detectingswitch

Discin/outcircuit

ＴＲＯＵＴ
ＴＲＩＮ

ＴＲＯＰＥＮ

ＴＲＣＬＯＳＥ

３９

５１

４８

４９

Loader

Feedelectric
machineonloader

２３

２０

１９

１８

１７

７

２

１
４

ＳＬ＋

３

ＳＬ－

DVDlaserpowercontrol

VCDlaserpowercontrol

Discidentificationcircuit

１５

１７

１７

１８
２３

２６

２８

Ｕ６０２
Ｄ５９５４

１４

１３

ＳＰ－

１２

ＳＰ＋

１２

５

１

ＩＯＡ

Ａ、Ｂ、Ｃ、Ｄ、Ｅ、Ｆ（ａ、ｂ、ｃ、ｄ）

Mainaxis
brakingcircuit

Mainaxiselectric
machineonloader

Integrationcircuit

Integrationcircuit

ＯＰＯ

ＡＤＩＮ

ＯＰ－
ＯＰ＋

２２

２０
２１

２３

１１４

４７
３４

３５
３６

ＭＴ１３８９

Integrationcircuit

Integrationcircuit

Figure3.2.9.1Servocircuitdiagram

Afterloaderreadingdiscinformation,A,B,C,D,E,FsignalsaresentouttoMt1389(DVDonly

hasA,B,C,Dsignals),andtheninputtedfrompin2~11,18,19ofMT1389.Afterbeingamplifiedand

processedbythepre-amplifierinsideMT1389,nowsignalsareseparatedtotwopartsforprocessing

insideMt1389:

AfterbeingprocessedbydigitalservosignalcircuitinsideMT1389,onepartofsignalform

correspondingservocontrolsignalsandoutputFOO,TRO,DMO,FMOdigitalservocontrolsignalsfrom

pin42,pin41,pin37,pin38ofMt1389respectively,thenchangeintoanalogservocontrolsignalFOSO,

TRSO,DMSO,FMSOthroughintegrationcircuitcomposedbyresistorcapacitor,andsendtodriver

circuitBA5954foramplificationtobringalongfocuscoil,tracecoil,mainaxiselectricmachineandfeed

electricmachineafterdriveamplification.Amongthese,focusandtraceservoareusedtocorrect

objectivepositionaccurately;feedservoisusedtobringalonglaserheadtomakeradiallarge-scale

movewhichbelongstothepreliminaryadjustmenttopick-upposition;andmainaxisservoisusedto

controlmainaxiselectricmachinetomakeitreadsignalsinmeansofconstantlinearvelocityandbring

alongdisctorotate.

-24-

AfterprocessingofamplificationbyVGAvoltagecontrolamplifierandequalizationfrequency

compensationinsideMT1389,anotherpartofsignalsarechangedintodigitalsignalsthroughinternal

A/Dconverter.WhenloaderisreadingCD/VCDsignals,thesesignalsareconductedEFMdemodulation

insideMT1389,andthenoutputtedtolatterstageforAVdecodingafterfinishingCIRC(Cross

InterleavedReed-SolomonCode)errorcorrectioninside.WhenloaderisreadingDVDsignals,these

signalsareconductedESMdemodulationinsideMT1389,andthensenttolatterstagefordecoding

afterfinishingRSPCerrorcorrectioninside.

Theotherpartofservoisopen/closedisctraycircuit.Afterpanelorremotecontrolleremits

open/closedisctraysignaltoMT1389,inusualconditions,TROPENandTRCLOSEsentoutbypin39,

51ofMt1389arebothlowlevel,whensignalof“open”comes,afterMt1389makesdiscstoprotating

throughmainaxisbrakingcircuit,TRCLOSEissethightomakeopen/closeelectricmachineonloader

frameruntobringalongdisttraytoeject.AfterdisctrayejectingtoproperSignalofopeningtoproper

position(TR_OUT)issethighlevel(0V)throughthedetectingswitchonloaderframe,MT1389pulls

downTRCLOSEandopen/closeelectricmachinestoprunning.WhenMT1389receiving“close”signal,

TROPENissethighlevelbyMT1389,open/clodeelectricmachinetunsconverselytobringalongdisc

traytoclose.Afterdisctrayclosingtoproperposition,signalofclosingtoproperposition(TR_IN)isset

lowlevelthroughthedetectingswitchonloaderframe,MT1389pullsdownTROPENandelectric

machinestopsrunningtofinish“close”process.

3.Explanationtoservoterms

FOO:whenrotating,discmayprobablymoveupwardsordownwardsslightlytomakethefocusof

laseremittedbypick-upcannotjustlyfallondatapitofdisc,sopick-upisrequiredtomoveupwardsor

downwardstomakefocusaimatdatapitjustly.Whenpick-upismovingupwardsordownwards,it

meansthatpick-upismakingfocusacts.

TRO:datainformationissaveindiscinformoftracks.Theprocesswhenpick-upmovesfromone

tracktoanotheronetoreaddataistrace.Inthisprocess,itisobjective,buttheentirepick-up,that

movesforwardsorbackwards,andthemovingrangeisverysmall.

FMO:similartoactsoftrace,theactsoffeedarelargerthanthoseoftrace.Feedconductsalarge

scalemovementfirstly,andthentracemovesslightlyinthisrange.Feedmovesforawhile,anddoes

notmoveforanotherwhile;buttracemovesallthetime.Feedisroughadjustmentandtraceisfine.

DMO:itisthetopthatholdsupdisc.Itsrotationspeeddecidesthatofdisc.Itsrotationisgenerated

byanindividualDCelectricmachine,inwhichrotationspeedofDVDistwiceoverthatofCD.

Hint:Inordertoobservetheseprocesses,youmaytakedownuppercoverofthemachine,and

thentheloadercoverboard.Whenpoweronwithnodiscinordiscinafterdiscout,youmayobserve

thatpick-upreturnstoinnerringfirstlyandthenspringsbackforalittledistance,whichisfeedprocess.

Thenpick-upwillemitlightandyoumaynoticetheobjectivemovesupwardsanddownwards,whichis

focusprocess.Inface,inthesametimeoffocus,theobjectivealsomovesupwardsandbackwardsto

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Maketraceacts.Becausetherangeissmall,itisnoteasytoobserve,andmeanwhileDEMOdisctray

alsorotatesslightly,whichisDEMOacts.

3.2.10Decodecircuit

1.Decodecircuitblockdiagramisshowninthefollowingfigure3.2.10.1:

FLASH

PWR

PRD

PCE

A0~A20

AD0~AD7

URST

Reset
circuit

MT1389

SDA
SCL

EEPROM

24C02

Figure3.2.10.1Decodecircuitblockdiagram

27M

Clock

V18

1.8Vvoltage
regulating

U206

SDCLK

SDCKE

DCS

DRAS

SWE

SDRAM

DQM0

DQM1

DQ0~DQ15

MA0~MA11

2.Workingprinciple:thisdecodecircuitismainlycomposedofMt1389,SDRAMandFLASH.The

importantconditionsfordecodecircuitworking:

(1)Reset:refertoresetcircuitworkingprinciplefordetails.

(2)Clock:thissystemadopts27Mexternalclockinputandproducestheclocksignalrequired

insidesystemthroughinternalfrequencydoublingcircuit.

(3)Power:decodechipadoptstwogroupsofpowersupply:3.3Vand1.8V,inwhich1.8Vis

providedforinternallogiccontrolcircuit,sowecallcarevoltage.

Afterpoweron,resetcircuitperformsresettoCPU(8032)andFLASHinsideMt1389,decodechip

outputsresetsignalatthesametimetoperformresettoothercircuit.Aftersystemreset,readsignalis

sentouttoFLASHtoreadtheinformationsavedinFLASHandmachinedisplayspoweronpicture.

Servosystembeginstoworktocheckwhethermachineclosestoproperpositionandwhetherswitchis

turnedoff,ifnot,closeactionisperformed.Afterdoordetectswitchisturnedoff,themachinebeginsto

carryoutthepreparationworkforreadingdiscandpaneldisplayatthesametime.

Playbackprocess:laserheadpicksupdiscsignalfromdisc,afterbeingprocessed byservo

system,andsendsittodecodecircuitfordecoding,andsignalafterbeingdecodedissavedinSDRAM

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