BBK DV725SI SERVICE MANUAL

DV725SI

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

2.2.2RearPanelIllustration

2.2.3LEDDisplayWindowIllustration

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

2.5Specifications

ChapterThreePrincipleandServicing

SectionOnePrincipleofthePlayer

3.1.1Blockdiagramoftheplayer

3.1.2PCBboardblockdiagramoftheplayer

3.1.3IntroductiontoICusedbythisplayer

SectionTwoUnitCircuitPrinciple

3.2.1Briefintroductiontoloader

3.2.2Servocircuit

3.2.3Laserpowercontrolcircuit

10
10
10
10
11

12
12
12
12
14
15
15
17
19

3.2.4CD/DVDconversioncircuit

3.2.5Discin/outcircuit

3.2.6Mainaxiscontrolcircuit

3.2.7Decodecircuit

3.2.8Resetcircuit

3.2.9Videocircuit

3.2.10Audiocircuit

3.2.11Mutecircuitandpower-offquietingcircuit

3.2.12Cardreadcircuit

3.1.13AVoutputboardcircuit

3.2.14MICcircuit

3.2.15Headphonecircuit

3.2.16Controlpanelcircuit

3.2.17Powercircuit

SectionThreeServicingCases

20
21
22
24
25
26
27
28
29
30
31
32
32
33
34

3.3.1Servicingcases

3.3.2Troubleshootingflowchart
SectionFourWaveformdiagram
SectionFiveFunctionIntroductiontoIC

34
39
51
59

3.5.1functionintroductiontoMT1389HD

59

3.5.2functionintroductiontoFLASH

3.5.3functionintroductiontoSDRAM

3.5.4functionintroductiontoD5954

3.5.5functionintroductiontoCs4360

3.5.6functionintroductiontoCs5340

3.5.7functionintroductiontoU209(LM1117MP-1.8)

3.5.8functionintroductiontoHS0038A2

3.5.9functionintroductionto4558/4580

3.5.10functionintroductiontoTDA1308

3.5.11functionintroductionto24LLC020

3.5.12functionintroductiontoFDSH321

3.5.13functionintroductiontoLM431A

3.5.14functionintroductionto2501

ChapterFourDisassemblyandAssemblyProcess

75
75
76
77
78
79
80
80
80
81
82
82
83

84

ChapterCinquePCBboard&Circuitdiagram
SectionOnePCBboard
SectionTwocircuitdiagram

ChaptersixBOMList

85
85
94

101

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,DoblyDigital,PCMDigitalaudiooutputstosatisfytheFans’Ssacousticrequirements.

ManyConvenientFeatures

1.Screensaverprotectsyour TVsetcarefully.

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.

NOTE:DivXversionisstillupgradingcontinuouslyandthelatestversionofthisunitisDivX5.1.
SomediscslabelledwithMPEG4onthemarketactuallyareothers,withwhichareuncompatible.
Pleasetakecarewhenbuyingdiscs.

2.2ControlButtonLocationsandExplanations

2.2.1FrontPanelIllustration

-4-

2

3

44 5

6 7 8 9

1

POWERswitch

2

IRSENSOR

3

Displaywindow

4

Powerindicator

5

Disctray

2.2.2RearPanelIllustration

1

MixedAudiooutjack

2

5.1CHAudioOutjack

3

VideoOutjack

4

S-Video

6

OPEN/CLOSEbutton

7

PLAYbutton

8

STOPbutton

9

Pushbutton

5 6

42 3

10 11 12 13

10

PREVbutton

11

PAUSEbutton

12

NEXTbutton

13

SlotflapforUSB

7

5

VideoComponent/YPbProutjacks

6

DigitalAudioCoaxialOutjack

7

DigitalAudioOpticalOutjack

8

SCARToutjack

8

2.2.3LEDDisplayWindowIllustration

ＣＤ

1

Play

2

Playbacktime

3

DVDdisc

4

Pause

2.2.4RemoteControlIllustration

1

[]

Button

Openorclosethedisctray.

2 3

ＶＣＤ
ＭＰ３

5

CDdisc

6

Mp3disc

7

VCDdisc

2

LANGButton
Changetheaudiolanguageoraudiochannel.

64 75

-5-

10

12
13
14

MEMORYButton

3

Savetheplayingpointorjumptothesavedpoint.

4

1

2
3
4

15
16

17
18

5

DISPButton
Displayorhidediscinformation.

5

NUMBERButtons

6

BROWSEButtons
switchnewuserinterface.

6

7

8
9

11

19

20

21
22
23

24
25

26
27

7

CURSORButtons

8

SETUPButton
FunctionSetup.

[]

9

Button

Open/closethevirtualkeyboardfunction.

10

KARAOKEButton
Karaokeoperationmenu.

[]

11

Button

[]

24

Button

Fastbackwardplay.

[]

25

Button

Stopplayback.

[]

26

Button

Skipforward.

27

USBDVDButton

28

VOL+/-Button
Increase/decreasevolumelevel.

29

MUTEButton
Pressoncetomute,twicetounmate.

28

29

Fastbackwardplay.

[]

12

Button

Skipbackward.

13

PEPEATButton
Repeatplay.

14

A-BButton
Repeattheselect.

[]

15

Button

Pressoncetostandby,Presstwicetoplay.

16

SUBTButton
Changesubtitlelanguage,SwitchJPEGdisplay
mode.

17

Q-PLAYButton
Skiptheadvertisement/warningandplaytheDVD
directly.

18

ANGLEButton
Changecameraangle,MP3/JPEGplaybackmode
switch.

19

MENUButton
DisplayDVDmenuoropen/closePBC.

20

OKButton

21

CancelButton

22

ZOOMButton
Zoomin/outthedisplayedframe.

23

[]

Button

Playorpauseplayback.

-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

Off

IS

LB

L.

Off

L.

0
0
0
0

0
0
0
0

Setupmenu
DVDmenu
Soundtrack
Subtitle

AUTO
PAL
NTSC

High
Medium
Low

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].TheImage
settingpageappearsonthescreen.

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

S-Vid.

5.Press[LEFT]buttonifyouwanttoreturnto
theprevioussetuppage.

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

TVsystem
TVscanmode
Videoout.
TV

format
Sharpness
Gamma
Brightness
Contrast
Hue
Saturation

AUTO

S-Vid.

1.TVsystem:Thisitemisusedtothevideo
outputsystemofthisunit.

Optionalsetting:Auto,PAL,NTSC.

◆

Default:AUTO.

◆

2.TVscanmode:Toset
Interlacedscanmode

Optionalsettings:Progressive,Interlaced

◆

Default:Interlaced.

◆

3.Videooutput:TosetthetypesofSCARTout
connector.

AUTO
PAL

IS

NTSC

LB

L.

Off

0
0
0
0

Progressivescan,

.

-7-

◆

Optionalsetting:S-Video,Component,SCART.

◆

Default:Component.

◆

WhenusingRGBoutputsfromtheSCART

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

4.TVformat:Tosettheaspectratioofthis
player’soutputimage.

◆

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

16:9TV.

◆

Default:16:9letterb.

5.Sharpness:Usedtosetthesharpnessofvideo
outputs.

◆

Optionalsetting:High,Medium,Low.

◆

Default:Low.

6.Gammaemendation:Thisitemisusedtosetup
theGammavalueofvideooutput.

◆

Optionalsetting:High,Medium,Low,Off.

◆

Default:Off.

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'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
sum

FSW

Off

1.Mixer...

channelaudio.

Optionalsetting:Stereo,5.1.

◆

Default:Stereo.

◆

B.Stereomix:Tosettheoutputmeansoftheleft

orrightaudiowhenplayingaDolbydiscwith
separatetwo-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

16

surround

R l r Center SW

16 16 16 16 16 16

b.Press[LEFT/RIGHT]navigationkeystoselect

thedesiredchanneltoadjust.

c.Press[UP/DOWN]navigationkeystoraiseor

lowervolumeofthechannel.

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

page.

F.Delays:TosetdelaytimeoftheCenter/

Surround/SubwooferSpeaker.

A.Press[UP/DOWN]navigationkeystoselect

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

Configuration
Stereomix
Surr.Mix
Lowband
Channels

Delays

PROLogicII

L+R
sum

FSW.

St.

Off

Stereo

5.1

A.Configuration:Tosetthisplayer’sDOWNMIX

modetochangemulti-channelaudiointotwo

Subwoofer 0cm
Center
LS/RS

0cm

180cm

b.Press[UP/DOWN]navigationkeystoSelect
thedesireditemoupPress[OK]or[RIGHT]
buttontoentersetting.

-8-

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,96KHz24

◆

bit.192kHz24bit.

Default:48kHz16bit.

◆

3.Tuning:

A.Maxvolume:setthemaximumvolume.
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:

◆

a.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

1.DVD:setwhetherinformationofadvertisement

andwarningsatthebeginningofDVDdiscis
skippedtoplaythemoviedirectly.
Alwaysskipads

Advertisemenu No

A.P.V

Off

◆

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.

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.

C.Afteradjustmentfinishes,press[OK]buttonto

returntomicrophonesetuppage.

Microphone
Kar.help
Volume
Echo

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

On

Off
5
5

On

Noast

4
4

On

Noast.

4

-9-

2.4.7Preference

Off
On

On
Off

LEDControl
Gr.equalizer
Screensaver

1.LEDControl:Thisitemisusedsetcolorofledonthefrontpanel.
Optionalsetting:On,Off.

◆

Default:On.

◆

2.Gr.equalizer:ThisitemisusedtosetwethertheDynamicSpectrumisallowed.
Optionalsetting:On,Off.

◆

Default:Off.

◆

DynamicSpectrumdisplayisinvalidinDatadiscDVDAUDIOplayback.

◆、

3.Screensaver:Openorclosethescreensaverfunction.
Optionalsetting:On,Off.

◆

Default:On.

◆

2.4.8Parentalcontrol

any
Kid
G

Allowed..
Setpassword

Any

PG
PG-13
PGR
R
NC-17

1.Allowed..:Tosettheparentalcontrolratingstopreventchildrenfromwatchingtherestrictedcontents.(

Incasethediscsupportsthisfunction.)

Optionalsetting:any,Kid,G,PG,PG-13,PGR,R,NC-17.

◆

Default:any.

◆

2.Setpassword:Tosetfourdigitpasswordtoenableyoutochangetheparentalcontrol

ratings.

Default:7890.

◆

Oldpassword
Newpassword

Verify

OK Cancel

2.4.9Initialsetup

Press[U/DOWN]arrowtoselectthedesiredoptionandPress[OK]buttontoconfirmit.
NOTE
Inthissetupstate,youmaynotpress[LEFT]buttontoreturntothepreviousmenu.

2.4.10Resttodefaults

Loadfactoryseeings

OK Cancel

-10-

2.5Specifications

Playable dlscs

Inputs
Outputs

Video characteristice

Audio characteristice

Operation voltage

DVD-Video,Super VCD,VCD,DlvX 3.11,DlvX 4,DlvX 5,DlvX Pro,XvlD,
CD-DA, CD+G,DVD-Audio,HDCD,MP3,WMA,Kodak Plcture CD,JPEG

MIC Input,USB
Audio Outputs

Analog audio output: Stereo,Output 5.1CH
Dlgltal audio output: Coaxlal,Optlcal

Video Outputs

Composlte,S-Video,Conponent Y Cb Cr,Proglesslve
scan output Y Pb Pr,RGB/SCART

Heedphones 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(±1 dB)
Slgnel-to-nolse ratlo >100(dB)
THD <0.01%

~110-250V,50/60Hz
Power consumption
General specification

14W

Dlmenslons: 420×236.5×39mm

Mass: 2.3Kg
Operating temperature

Operating humidity

◆◆Designandspecificationsaresubjecttochangewithoutnotice.

Wedonotguaranteethatalldiscscanbeplayedsmoothlyduetothediscquality,discrecording

qualityandrecordingfomnat.

5-35℃

15-75%(no condensatlon)

-11-

ChapterThreePrincipleandServicing

SectionOnePrincipleofthePlayer

3.1.1Blockdiagramoftheplayer

DV725SIiscomposedofdecodecircuit,servocircuit,audiocircuit,videocircuit,MICcircuitand

powercircuit.Blockdiagramoftheplayerisshowninthefollowingfigure3.1.1.1:

Feed
electric
machine

Main
axis
electric
machine

ACIN

VR-DVD
VD-CD

LD-DVD

LD-CD

M

M

M

Powerboard

CD/DVDswitch

TK-

TK+
FC+
FC-

SL+

SL­SP+

SP-

Laserpower
control

DVD:A/B/C/D/RFO

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

AM5888

U301

+9V

-9V

Dv33

AVCC

LD01

MDI

VIP4

FOSO
FMSO
DMSO

TRSO

U206

EEPROM

U202

24C02

SDA
SCL

LD02

IOA

Card
board

V18

SDRAM64M

U208

FLASH16M

U207

MT1389HD

U201

Reset

Open/close
controlcircuit

SDA
SCL

UREST

MICboard

CS5340

XI

27Mclock

XO

MIC

Video
filtering
catching

Panel

RT

Audio

LT

amplifying

SR

filtering

SL

U209

LFE

U210

CC

U211

VIDEO_SY
VIDEO_SC
VIDEO_CVBS
VIDEO_G/Y
VIDEO_B/U

VIDEO_R/V

AV
output
board

Figure3.1.1.1Blockdiagramoftheplayer

-12-

3.1.2PCBboardblockdiagramoftheplayer

PCBboardblockdiagramoftheplayerisshowninthefollowingfigure3.1.2.1, DV725SIisaslot-in
loadermachine,withUSBreadfunction.Powerboard,AVoutputboardandMICboardisthesamewith
thatofDV516SI,pleasereferto“DV516SIservicemanual”.

Cardboard
A725SI-1

VCC
USBM
USBP
GND

XS901

Mainpanel

4977-3

XS401

Loadercomponents

boardison
toppartof
loader

Photoelectric
detectboardis
onbottompart
ofloaderClosedetect

XS305

VCC
USBM
USBP
GND

XS205

Fs0
SDA
SCK
STB
GND
VCC
IR

XS402

XS304

XS201

Discin/out
electric
machine

XS302

Smallbracket

XS307

Decodeboard

2521S-0

XS203

Laserhead

XS301

PDAT2

PDAT1
SPDIF

VCC

Y

C

Pr

Y1

Pb
VIEDO
PDAT0

L
R

SL

SR

CC

LFE

+10V

AVboard

7969-5

XS702

XS901

Subsidiary

panel

9997-1

Cn502

Powerboard

5977K-5

Figure3.1.2.1PCBboardblockdiagramoftheplayer

-13-

CN501

-9V
+9V

AGND

OK

DET

XS603

XS601

AGND

L

R

MICboard

6977K-0

3.1.3IntroductiontoICusedbythisplayer

IntroductiontoICusedbythisplayerisshowninthefollowingtable:

Semi-finished PCB

name

Power board 5977K-

5

Main panel 4997-3

OK board 6977K-0

Decode board

2521S-0

IC model name Location Function

AZ431 U503 Precise voltage regulator
HS817 U502 Photoelectric coupler

VIPER22A U501 Power switch IC

PT6312 U401 Control panel IC

HS0038B3V U402 Remote control receiver

KA4558 U601

TDA1308 U603 Headphone amplifying

NJM4558 U209,U210,U211

HCU04 U205 Phase inverter

HY57V641620HGT-7 U208 SDRAM

LM1117 U206 1.8V voltage regulator IC

24C02 U202 EEPROM

MT1389HD version U201 Decode chip

Operational amplifier (MIC

amplifying)

Operational amplifier (audio

amplifying)

D5954 U302 Servo drive
CS4360 U204 D/A inverter
CS5340 U203 A/D inverter

29LV160BE U207 FLASH

-14-

SectionTwoUnitCircuitPrinciple

3.2.1Briefintroductiontoloader

1.V725SIadoptsphototonusdualslot-inandall-sealedwholesteelloaderwithcompactstructure.
Awhole-steeldiscpresssystemisinsideloadertotightlypressthediscthroughthreesmallsteelplates
tobebettersuitabletoreadthosemal-fabrictaedandfakediscs.Itisreallyfullycompatible,notonly
readlargediscwith12cm,butalsosmalldiscwith8cm.Discreadingofthemachineadoptsphototonus,
youonlyneedtoplacethediscatthedoorandtheloaderwillabsorbthediscinautomatically.This
loaderemploysSANYOlaserheadwiththeprinciplesimilartoloaderofHD62.

Vcc

GND

PICK_UP

DISC

DESCEJT

Q2

GND

Figure3.2.1.1Discdetectillustration

Q1

TROUT

Vcc

2.Workingprinciple:showninthefigure3.2.1.1,therearetwoemissionpipesontoppartofdisc
entryofslot-inloader,andtwophotoelectricpipesarearrangedintwoendsofdiscentry.Afterloading
onedisc,thedischoldsupthelightemittedfromemissionpipetomakethecorrespondingphotoelectric
diode(Q2)ofthisemissionpipecannotreceivethelightirradiation.ThedetectsignalDISCEJTon
loaderoutputshighleveltodecodeboard,whenDISCEJTdetectpinofMT1389detectsthatDISCEJT
signalishighlevel,itoutputsdiscincontrolsignal.Afterdiscisintotheproperposition,themechanic
structureofloadertouchesthediscinswitch,TRINchangesfromhighleveltolowlevel,decodechip
stopsoutputtingdiscinsignal,andmachinebeginstoreaddisc.Whenopendiscdoor,transmission

-15-

Structuresendsthediscout,discdetectsthroughthephotoelectricpipe(Q1)insideloader,afterdiscis
inthespecifiedposition,TROUTchangesintolowlevel,andmachinestopsopeningthediscdoor.To
makeunderstandingeasy,wecanrefertoprincipletheillustration(irrelevanttotheactualcircuitandfor
referenceonly).

2.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

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

-16-

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

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.

3.2.2Servocircuit

ServosystemofthisplayeradoptsSANYOloader+MTKdecodesolution(MT1389E+FLASH(16M)
+SDRAM(64M)),anditsservocircuitismainlycomposedoffrontendsignalprocessing,digitalservo
processing,digitalsignalprocessingICMT1389EanddrivecircuitD5954,inwhichMT1389Eisalsothe
maincomposedpartofdecodecircuit.Servocircuitblockdiagramisshownasinthefollowingfigure

3.2.2.1:

Xs101

Feedelectricmachine

Mainaxiselectricmachine

Mainaxiscontrol
detectcircuit

Switchcircuit

APCcircuit

ABCDEFRFO

TK-

15

TK+

16

FC+

14

FC-

13

SL+

17

SL-

18

SP-

12

SP+

11

D5954

23
26

IOA
MD11

LDO2
LDO2

FOSO

1

FMSO
TRSO
DMSO

6

Discin/out
circuit

MT1389

Figure3.2.2.1Servocircuitblockdiagram

2.Workingprinciple

Afterpoweron,machinedisplaysOPEN,afterloadingdisc,loaderlensbeginstoreset,whenlaser
headisintheposition,detectswitchwillgiveasignaltoMT1389,MT1389beginstooutputfocus,main
axisandlightemissionsignals,discbeginstorotate,laserheadbeginstoidentifydiscinformation,and
judgewhetherdiscisCDorDVDaccordingtodiscinformationtofacilitatelevelfromIOApinandcontrol
discswitchcircuitandlaserheadPDICtomakethecorrespondingcontrolacts.Atthesametime,
MT1389controllaseroutputpowerthroughlaserpowercontrol circuit.

-17-

Afterloaderreadsdiscinformation,A,B,C,D,EandFsignalareformedthroughphotoelectric
conversiontoMT1389(DVDonlyhasA,B,C,Dsignals)andRFsignalandoutputfrompin2~11,18,19
ofMT1389respectively,afteramplifyingprocessingofpre-amplifierinsideMT1389,nowsignalsare
dividedinto2waysinsideMT1389:onepart,throughsummationamplifyingandsubtractioncircuit
insideMT1389,producesservoerrorsignal,afterdigitalservosignalcircuitprocessing,forms
correspondingservocontrolsignals,outputsFOO,TRO,DMOandFMSOservocontrolsignalfrompin
42,41,37and38ofMT1389respectivelyandthensendtoservodrivecircuitfordriveamplifying
throughtheintegrationcircuitcomposedbyresistorandcapacitorandbringalongfocuscoil,tracecoil,
mainaxiselectricmachineandfeedelectricmachineafterdriveamplifying.Amongthese,focusand
traceservoareusedtocorrectobjectivepositionaccurately;feedservoisusedtobringalonglaser
headtomakeradiallarge-scalemovewhichbelongstothepreliminaryadjustmenttolaserheadposition;
andmainaxisservoisusedtocontrolmainaxiselectricmachinetomakeitreadsignalsinmeansof
constantlinearvelocityandbringalongdisctorotate.AfterprocessingofamplificationbyVGAvoltage
controlamplifierandequalizationfrequencycompensationinsideMT1389,anotherpartofsignalsare
changedintodigitalsignalsthroughinternalA/Dconverter.WhenloaderisreadingCD/VCDsignals,
thesesignalsareconductedEFMdemodulationinsideMT1389,andthenoutputtedtolatterstageforAV
decodingafterfinishingCIRC(Cross-InterleavedReed-SolomonCode)errorcorrectioninside.When
loaderisreadingDVDsignals,thesesignalsareconducted ESMdemodulationinsideMT1389,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.

-18-

3.2.3Laserpowercontrolcircuit

Laserpowercontrolcircuitisshownasinthefollowingfigure3.2.3.1:

LDO-AV33

R301

4.7R
TC302

47uF/16V

LDO2

23

Q301

2SB1132-S

XS301

20

19

MD1

Q302

2SB1132-S

20/21

MT1389E

LDO1

TC303
47uF/16V

R302

4.7R

Figure3.2.3.1Laserpowercontrolcircuitdiagram

2.Workingprinciple

Pin20/21ofMT1389islaserpowerdetectsignalinputpin,pin21isDVDlaserpowerstrong/weak
detectsignalinputpin,pin23isVCDlaserpowerdrivecontroloutputpin,pin22isDVDlaserpower
drivecontroloutputpin.

WhenreadingVCDdisc,laserpowerbecomesweak,voltageofMDIIpindecreases,voltage

LDO-AV33

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

-19-

3.2.4CD/DVDconversioncircuit

1.CD/DVDconversioncircuitisshownasinthefollowingfigure3.2.4.1:

AVCC

Q305
3904-S

R309
10K

R311
10K

R310
100K

IOA

XS301

2.Workingprinciple

R308
100K

Q303

17

2SK3018-S

18

Figure3.2.4.1CD/DVDconversioncircuitdiagram

Q304

2SK3018-S

MT1389E

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

State

DVD disc 0 3.86 0 3.81 0.18 0
VCD disc 0.64 0.1 0 0 0 0

State

Base electrode

B

G D S IOA

Collector C Emitter E

Q304

Grid electrodeGDrain electrode

D

Source

electrode S

DVD disc 0 0 0 0
VCD disc 3.27 0.18 0 3.3

-20-

3.2.5Discin/outcircuit

1.Discin/outcircuitisshownasthefollowingfigure3.2.5.1:

MO_VCC

R327
100R

TC309

47uF/16V

TRCLOSE

TROPEN

R328
10K

LOAD+

MT1389

TC308

47uF/16V

LOAD-

TROPEN

R323
220R

R325
100R

Q306
8550D

Q308

8050D

R326

2.2R\1/4W

Figure3.2.5.1Discin/outcircuitdiagram

Q307
8550D

Q309
8050D

R324
220R

Q310
9014-S

2.Workingprinciple:INDISC,OUTDISIarediscin/outcontrolsignalsandareconnectedtopin39,
54ofU201(MT1389)respectively.LOAD+,LOAD-connectwithtwoendsofelectricmachinetocontrol.
Whenusersareperformingdiscoutoperation,servocontrolchipU201(MT1389)sendsoutcontrol
signalthroughpin39,54andchangeslevelofLOAD+,LOAD-tochangetherotationdirectionofelectric
machinetorealizediscin/outfunction.Theworkingprocessofdiscin/outcircuitisshownasfollows:

OUTdisc:VCCQ306CEelectrodeonLOAD+ElectricmachineLOAD-Q309CEelectrode

onR326Ground

→→

→→→→→

Whennotopeningdisctray,pin39and54ofU201(MT1389)arelowlevel.Whenopeningdisctray,
pin39ofU201(MT1389)sendsahighlevel;Q309ison;Q309collectorelectrodechangesintolow
level;LOAD-changesintolowlevel;Q306baseelectrodechangesintolowlevel;Q306ison.Q306
collectorelectrodechangesintohighlevelandLOAD+changesintohighlevel.

INdisc:VCCQ307CEelectrodeonLOAD-ElectricmachineLOAD+Q308CEelectrode
onR326Ground

→→

→→→→→

Whenclosingdisctray,pin54ofU201(MT1389)sendsahighlevel;Q308ison;collectorelectrode
changesintolowlevel;LOAD+is lowlevel;baseelectrodethroughR230andQ307islowlevel;Q307is
on;Q307collectorelectrodechangesintohighlevel;LOAD-changesintohighlevel.

ThefunctionofQ310isinterlockINDISCandOUTDISCsignaltoensurethetwoarenothighlevel
atthesametime.Whenthetwoarehighlevelinput,baseelectrodeofQ309ismadetolowlevelthrough
Q310ontoensurethenormalworkingofdiscin/outcircuit.ThefunctionofelectrolyticcapacitorTC308
andTC307istoavoidthesuddenchangeofthevoltageontwoendsofdiscin/outelectricmachineto
makediscin/outactssmooth.

-21-

3.Keypointvoltage(unit:V)isshownasthefollowingtable:

Q307Q306

State

Base electrode B Collector C Emittor E Base electrode B Collector C Emittor E

Read disc 5.06 5 5.06 5.01 5.03 5.06

Open disc tray to

proper position

Open disc tray

Close disc tray

State

Read disc 0 5 0 0 5.03 0

Open disc tray to

proper position

Open disc tray
Close disc tray 0

State

Read disc 0 0 0 0 0

Open disc tray to

proper position

4.79 4.77 5.06 4.77 4.79 5.06

4.74→5.05→4.74 4.76→0.2→4.76

4.74→4.33→4.74 4.76→5.05→4.76
Q308

Base electrode B Collector C Emittor E Base electrode B Collector C Emittor E

0 4.77 0 0 4.79 0

0→0.93→0 4.76→0.2→4.76

4.76→5.05→4.76
Q310

Base electrode B Collector C Emittor E

0 0 0 0 0

5.06

5.06

0 0
0

4.76→4.33→4.76 4.76→5.02→4.76

4.76→5.03→4.76 4.79→0.2→4.79

0→0.93→0 4.79→0.2→4.79

Q309

4.79→5.02→4.79

OUT IN

5.06

5.06

0
0

Open disc tray
Close disc tray 0

0→0.63→0

0 0

0→0.93→0

0→3.12→0

0 0

3.2.6Mainaxiscontrolcircuit

1.Mainaxiscontrolcircuitisshownasinthefollowingfigure3.2.6.1:

SP-

SPL-

R320
150K

R321
1R

R319
150K

C307 222

R318

R317680K

C308 222

R322 680K

0R

OPO
ADIN

OP-

OP+

V1P4

0

0→3.12→0

MT1389

Figure3.2.6.1Mainaxiscontrolcircuitdiagram

-22-

2.Function:discisalwaysinhighspeedrotationinthecourseofdiscreading,whenyouneedto
openthedoortochangedisc,MT1389stopsthepositivedirectiondrivesignalwhichisgiventomain
axisdrivecircuit,forthefunctionofinertiadiscisstillrotating.Ifdiscoutorderisperformedatthistime,
discwillbeabrasivelydamaged.Therefore,machinemustbebakingtomainaxis,thatwhetherdischas
stoppedrotatingandwhetherdiscisreversing,decodechipofthemachinecannotrecognize.Soamain
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
than1.4VvoltageandtransmittoinputpinofMT1389ADINthroughR318.WhenADINishighlevel,
mainaxisdriveoutputendhasnotanydrivesignaloutput,whenADINislowlevel,MT1389outputsa
reversingdrivesignaltomainaxisdrivecircuittomakemainaxiselectricmachinespeeddown.Thus
circularworkinggoesonuntilmainaxisstopsrotating.PDVDismanualdiscoutmeans,soafterdiscout,
discisstillrotating,butwillstopveryson.

4.Keypointvoltage(unit:V)isshownasthefollowingtable:

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

SP+ Pin 11 of D5954, pin 5 of XS307 3.79

SP- Pin 2 of D5954, pin 6 of XS307 1.38

OP+ Pin 36 of MT1389 1.38

OP- Pin 35 of MT1389 1.53

OPO Pin 34 of MT1389 2.44

ADIN Pin 50 of MT1389 2.44

DMSO Pin 5 of D5954 1.42 1.42

VIP4 Pin 30 of MT1389 1.41 1.41

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

-23-

3.2.7Decodecircuit

1.Decodecircuitblockdiagramisshownasinthefollowingfigure3.2.7.1:

SDCLK
SDCKE
DCS
DRAS

SWE

SDRAM

DQM0
DQM1

DQ0~DQ15

MA0~MA11

FLASH

PWR
PRD

PCE

A0~A20

AD0~AD7

URST

Reset
circuit

MT1389

SDA
SCL

EEPROM

24C02

Figure3.2.7.1Decodecircuitblockdiagram

Clock

27M

V18

1.8V
voltage
regulating

U206

2.Workingprinciple:thisdecodecircuitismainlycomposedofMT1389,SDRAMandFLASH.
Workingconditionofdecodecircuithas:

(1)Reset:refertoresetcircuitworkingprinciplefordetails.
(2)Clock:thissystemadopts27Mexternalclockinput,andproducesclocksignalrequiredby

systeminsidethroughinternalfrequencydoublingcircuit.

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

supplypowerforinternallogiccontrolcircuitandwecallitcorevoltage.

Afterpoweron,resetcircuitperformsresettoMT1389built-inCPU(8032)andFLASH,decodechip
outputsresetsignalatthesametimeandperformsresettoothercircuit.Aftersystemreset,itfirstly
sendsoutreadsignaltoFLASHtoreadoutinformationsavedinFLASH,themachinedisplayspower­onpicture,servosystembeginstoworktocheckwhethermachineclosesdoortoproperpositionand
whetherdetectswitchhasbeenclosed,ifnot,thedoorcloseactionisperformed.Afterdetectswitchof
doorisclosed,themachinebeginstoperformpreparationsofdiscreadingandperformspaneldisplay
atthesametimeofworking.

Playbackprocess:laserheadpicksup discsignalfromdisc,afterservosystemprocessing,then
sendtodecodecircuitfordecoding,signalafterbeingdecodedissavedinSDRAMforthemoment.
Whenmachineneedstoreplaysignal,decodecircuitcallsinformationinsideSDRAMtoperformD/A
conversionandthenoutput.

Userinformationstorage:informationcontentsetbyuserissavedinsideEEPROM,ifuserdoesnot
refreshorresetthisinformation,itwillsavedinICpermanently.

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Audio,videooutputcircuit:atpresent,MT1389allintegratesvideoD/Aconverter,MT1389Einside
integratesaudioD/Aconverter,manufacturesselectaccordingtotheirownneeds.Pleasereferto
circuitprinciplediagramandaudiocircuitexplanationfordetails.

3.2.8Resetcircuit

1.Resetcircuitisshownasinthefollowingfigure3.2.8.1:

DV33

100K

C271
105

R220
100R

D201
1N4148R219

5

C272
103

U205C
HCU04

Figure3.2.8.1Resetcircuitdiagam

6

U205D

HCU04

C273
102

89

R221
10K(DNS)

URST#

R222

33R

2.Workingprinciple:afterpoweron,voltageofDV33increasesto3.3Vfast,mainchippower
supplyisnormal.Now,forC271,C272voltagetogroundcannotchangesuddenlytomakenongate
inputendofU205C(thatis74HCU04TTLnongateICpin5)presentslowelectricpotential,nowreset
signalURSTkeepsinlowleveltoperformresetactstomainchip.DV33chargesC271throughR219,
andchargesC272throughR220atthesametimetomakethenongateinputendelectricpotential
increaseslowly.Whenvoltageinthisplaceincreasesto1.4V,resetsignalURSTchangesintohighlevel
fromlowlevel tofulfilresetacts.

Afterpoweroff,voltageofDV33decreases.Accordingtodecreasedwaveform,wecanseethatthe
frontsegmentdeceasesquickly,andbacksegmentdecreasesslowly.InthedecreasecourseofDV33,
nongateinputendelectricpotentialofU205CdischargestogetherwithDV33throughD201diode
1N4148.

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3.2.9Videocircuit

1.Videosignalflowchartdiagramisshownasinthefollowingfigure3.2.9.1:

XS204

YUV1

YUV2

L225

L226

R252

R253

VIDEO-SY

VIDEO-SC

Y

5

C

7

5

Y

C

7

S-Video

Jk703

AVoutput
board

YUV3

YUV4

YUV5

YUV6

L227

L228

L230

L232 L233

R254

L229

L231

Figure3.2.9.1Videosignalflowchart

VIDEO-CVBS

VIDEO-G/Y

VIDEO-B/U

VIDEO-RV

15

11

13

9

VIDEO

Y1

Pb

Pr

15
XS701

11

13

9

VIDEO

Y1

Pb

Componentvideo
outputterminal

Pr

JK703Video

SCART

2.Workingprinciple:MT1389Ehasbuilt-invideoD/Aconversioncircuit,videooutputhasR/B/G
Y/Pb/PrY/Cb/CrCVBSY/Coutputmode,inwhichR/B/GY/Pb/PrY/Cb/CrY/Ccannotoutputatthe
sametimeandneedtheswitchthroughsoftware.CVBSisaseparateoutputmode,4-pathvideosignal
outputtedbyMT1389,throughvideofilteringclamping,outputtoAVboard.

Shownasinthefigure3.2.9.2,capacitorC287,C288andinductorL214composealow-passfilter
tofilterhighfrequencydisturbancesignalexceptusefulsignal;dualdiodeD211composesalimiter
circuit,knownfromfeaturesofdiodethatthemaxamplitudeofcompositevideosignalCVBScannotbe
over5.7,andthemixcannotbelessthan-0.7,thusthehighvoltagesignalfromTVsetcanbeavoided
burningdowntheplayer.

CVBS

R248

75R

VGND

5VV

L227

1.8uH

C287
47pF

Figure3.2.9.2Videooutputcircuit

R254

0R

C288
47pF

3906-S(DNS)

VGND

R260
75R(DNS)

VIDEO_CVBS

Q217

R283

75R(DNS)

VGND

5VV

D211
1N4148*2

VGND

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