BBK DL370D Service Manual

DL370D

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

2.3RemoteControlIllustration

2.4Accessories

2.5FUNCTIONSETUP

2.5.1FunctionSetup

2.5.2GeneralSettings

2.5.3AudioSetup

2.5.4InitialSetup

2.5.5Usefulnotes

2.6Specifications

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

ChapterThreePrincipleorServicing

10

SectionOnePrincipleofthePlayer

3.1.1Blockdiagramoftheplayer

3.1.2PCBcompositionblockdiagramoftheplayer

3.1.3FunctionintroductiontoICoftheplayer

SectionTwoUnitCircuitPrinciple

3.2.1Servoprocessingcircuit

3.2.2CD/DVDswitchcircuit

3.2.3Laserpowercontrolcircuit

3.2.4Mainaxiscontrolcircuit

3.2.5DC-DCswitchcircuit

3.2.6Batteryvoltagedetectingcircuit

3.2.7Audiooutputcircuit

3.2.8Screenoffdetectcontrolcircuit

3.2.9VideocodingandLCDTFTdrivecircuit

3.2.10Chargecircuitandprotectioncircuit

10
10
11
11
13
13
15
16
17
17
19
20
21
22
25

3.2.11Controlpanelcircuitandremotecontrolcircuit

3.2.12Decodecircuit

3.2.13Resetcircuit

3.2.14Mutecircuit

SectionServicingCases

3.3.1Servicinginstances

3.3.2Troubleshootingflowchart

SectionFourServicingParameters

3.4.1Signalwaveformdiagram

SectionFiveFunctionIntroductiontoIC

3.5.1functionintroductiontoMT1389E

3.5.2functionintroductiontoAM5898N

3.5.3functionintroductiontoHWD4863

3.5.4functionintroductiontoS3C9454

3.5.5functionintroductiontoT102

26
26
28
29
30
30
34
44
44
51
51
62
62
63
65

ChapterFourDisassemblyandAssemblyProcess

70

ChapterCinquePCBboard&Circuitdiagram

76

SectionOnePCBboard
SectionTwocircuitdiagram

ChaptersixBOMList

upgradeboardunit

6.1

batteryboard

6.2
batterycase

6.3
batterychargeboard

6.4

6.5

batteryconnectingboard
batteryprotectboard

6.6

6.7

decodeboard
driveboard

6.8

mainpanel

6.9
powersocketboard

6.10

76
85

94
94
94
94
95
96
96
97
101
102
103

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

ThisplayerutilizescolorTFTLCDandnewgenerationDVDdecodingchipwithbuilt-inDolbyDigital
decoderswhichcanbringyoutoabrand-newAVentertainmentworld.The2-lasersupererrorcorrection
mechanismsupportsCD-R

Brand-newAVEffects.

1.7”colorTFTLCD.
CompatiblewithMPEG4discstoproducewonderfulpictures.

2.

3.Built-inDolbyDigitaldecoder.

4.Built-instereospeakers.

5.Hi-Fistereoheadphoneoutput.

HighQualityDigitalAudio

1.Built-inDolbyDigitalandDTSdigitalsurrounddecoder

NumerousConvenientFunctions

1.ScreensaverfunctioncautiouslyprotectsyourLCDandTV.

2.LargecapacitysolidLi-Ionbattery,electronicanti-shockcircuits,convenientforyoutowatchmovies

outdoors.

3.Easy-to-usebrand-newGUIandvirtualkeyboard.

4.Multi-angleplaybackfunctionmakesitpossibleforyoutoviewascenefromdifferentcameraangles.

5.Directentrytodesiredscenes(title/chapter/time/tracksearch).

6.MultipleaspectratiostofitvariousTVsets.

7.Parentalcontrolfunctiontoprotectchildrenfromwatchinginappropriatediscs.

8.Multipledubbinglanguagesandsubtitlelanguageskeepyouinthebestentertainingstatusanytime.

SupportsSVCD,VCD,CD,MP3,HDCD,KODAKPICTURECD,DVD-R/RW.

:SomediscslabelledwithMPEG4onthemarketactuallyare*.rm/*.ram/*.rmm/*.raandothers

NOTE

whichareimcompatible.Pleasetakecarewhenbuyingdiscs.

2.2ControlButtonLocationsandExplanations

1

2

3
4
5

6
7

8
9

10

11

-4-

19

18
17

16
15
14
13

12

1

ColorTFTLCD

11

Powerindicator

2

Speakers

3

PICTUREButton

4

DVD/AUXINButton

5

SETUPButton

6

FWDButton/UPdirectionarrow

7

PREV/LEFTButton

8

OPEN/CLOSEButton

9

PLAY/SELECTbutton

10

PAUSEbutton

12

IRsensor

13

STOPButton

14

Keyboard/SWITCHButton

15

REWButton/

16

NEXT/RIGHTButton

17

MENUButton

18

TITLEButton

19

Q-PLAYButton

DOWNdirectionarrow

1 2 3

5 6

7

4

1

VideoInjack

2

HeadPhonesjack

3

AudioInjack

4

DC5VOut

-5-

5

Powerswitch

6

Speakervolumeknob

7

DC9VIn

2.3RemoteControlIllustration

1

2

3

4

5

6
7

8

9

10

1

NUMBERButtons

2

GOTObutton
Playfromthedesiredlocation.

3

PLAYButton
Normalplayback.

4

STOPButton

19

18

17
16

15

14

13

12

Stopplayback.

5

SUBTITLEButton
Changesubtitlelanguages/SwitchJPEG
displaymodes.

6

CURSORButtons

7

SELECTButton

8

TITLEbutton
DVDtitles.

11

9

REWButton
Fastbackwardplay.

10

FWDButton
Fastforwardplay.

11

PREVButton
Skipbackward.

12

NEXTButton
Skipforward.

13

SETUPButton
Functionsetup.

14

REPEATButton
Repeatplay.

15

ANGLEButton
Changecameraangles,MP3/JPEGplayback
modesswitch.

16

MENUButton
DisplayDVDmenuoropen/closePBC.

17

OSDButton

19

PAUSEButton
Pauseframebyframe.

-6-

Displayorhidediscinformation.

18

AUDIOButton
Changetheaudiolanguageoraudiochannel.

2.4Accessories

AVCords
RemoteControl
AAASizeBatteries
InstructionManual
BatteryPack
PowerAdapter
WarrantyCard

2.5FUNCTIONSETUP

2.5.1FunctionSetup

1.PressSETUPbutton,TheTVsetscreen
displays:

1PCS
1PCS

2PCS

1PCS
1PCS

1PCS
1PCS

4.PressUP/DOWNarrowtoselectthedesired
value.PressSELECTtoconfirmit.

Forexample:PressUP/DOWNarrowtoselect
"LT/RT",thanpressSELECT,theTVscreen
Display:

————AudioSetupPage

AudioMode
EQType
SoundField
Tone
DolbyDigitalSetup

LT/RT
Stereo
VSURR
00

5.PressSETUPtoexitthesetupmenu.

————GeneralSetupPage

TVDisplayWide
OSDLangEnglish
ScreenSaverOn
Spectrum

Off

2.PressLEFT/RIGHTarrowtoselectthe
desiredchanneltobechanged.

Forexample,ifyouwanttosetthisplayer's
Audio,pleasepressLEFT/RIGHTarrowsto
selectAUDIOSETUPPAGE.PressSELECTfor
verification.Theaudiosetuppagedisplays
Onthescreen.

————AudioSetupPage

AudioMode
EQType
SoundField
Tone
DolbyDigitalSetup

LT/RT
Stereo
VSURR

3.PressUP/DOWNarrowtoselectthedesired
itemyouwanttosetandpressSELECT.

Forexample,pressUP/DOWNarrowsto
selectAUDIOMODEandpressSELECT.The
AUDIOMODEappearsonthescreen.

————AudioSetupPage

AudioMode
EQType
SoundField
Tone
DolbyDigitalSetup

LT/RT
Stereo
VSURR

CURSOR

SETUP

SELECT

2.5.2GeneralSettings

————GeneralSetupPage

TVDisplayWide
OSDLangEnglish
ScreenSaverOn
Spectrum

1.TVDisplay

:Tosettheaspectratioofthis

player'soutputimage.

Optionalsettings:NORMAL/PANSCAN,

◆

NORAM/LETTERBOX,WIDE.

Default:WIDE.

◆

NOTES

Theplayingeffectsarecontingentuponthe

◆

disc'srecordingaspectratio.Somediscsmay
notbeplayedaccordingtoyourselected
aspectratio.

16:9isonlyapplicabletothe16:9TV.

◆

Pleaseselecttheaspectrationinaccordance

◆

withthatofyourTV.

TheLCDscreenisutilizing16by9aspect

◆

ratioonly.

2.

OSDLang:Thisitemisusedtosetthe
promptslanguageonthescreen.

Optionalsettings:English,Russian.

◆

Default:English.

◆

3.

Screensaver:Openorclose thescreensaver

Function.

Optionalsettings:OFF,ON

◆

Off

-7-

◆Default:ON

4.Spectrum:Thisitemisusedtosetwhetherthe

DynamicSpetrumisallowed.
Selectablevalue:ON,OFF.

◆

Default:OFF

◆

2.5.3AudioSetup

————AudioSetupPage

AudioMode
EQType
SoundField
Tone
DolbyDigitalSetup

1.

Audiooutputmode:Tosettheaudiooutput
modetomakethemulti-channelaudiointo
two-channeloutputs.
Optionalsettings:LT/RT,STEREO,VSURR.

◆

Default:STEREO

◆

2.

EQtype:TosetEQmodes.

Optionalsettings:Off,ROCK,Pop,Live,Dance,

◆

Techno,Classic,Soft.
Default:Off

◆

3.SoundField

Optionalsettings:Off,Concert,Livingroom,

◆

:Tosetdifferentsoundfieldeffects.

Hall,Bathroom,Cave,Arena,Church.
Default:Off.

◆

4.TONEcontrol:Thisitemisusedtosetthetone

leveltomatchyourdiapasonwhenyouare
singing.
Methodtoadjusttone:

◆

A.PressUP/DOWNcursorbuttontoselect

TONEiteminAUDIOSETUPPAGE,andthen
pressSELECTbuttontoentertheadjustmenu

B.PressLEFT/RIGHTcursorbuttontoadjustthe

settingvalue.

C.PressSELECTbuttonto returntoAUDIO

SETUPPAGEafteradjustmentarewelldone.

5.

DolbyDigitalsetup:

A.

L+R:Tosettheoutputmeansoftheleftor
rightaudiowhenplayingaDolbydiscwith
separatetwo-channelaudio
Optionalsettings:Stereo,L-Mono,R-Mono,

◆

Mix-Mono.
Default:Stereo.

◆

B.

Dynamiccompression:Tosetthelinear
compressionratiotogetdifferentcompression
result.
Optionalsettings:OFF1/81/43/81/2

◆、、、、、

5/83/47/8FULL

、、、。

Default:OFF.

◆

Stereo
Off
Off
00

2.5.4InitialSetup

————PreferencePage

PBC
Audio
Subtitle
DiscMenu
Parental
Password
Default

1.PBC:TosetthePBCstatus.

◆

WhenplayingSVCDorVCD2.0discs,ifthe

PBCisON,themenuimagedisplaysonthe
screenandthisplayerenterthePBCmode;if
thePBCisOFF,thisplayerplaysthediscby
itssequence.

◆

Optionalsettings:On,Off.

◆

Default:On.

2.AUDIO

:Tosetthepreferenceaudiolanguage

whenplaying.

3.

SUBTITLE:Tosetthepreferencesubtitle
languagewhenplaying.

◆

Optionalsubtitlelanguages:English,French,

Spanish,Chinese,Japanese,korean,Russian,
Thai,others,Off.

◆

subtitlelanguagedefault:Off

4.

DISCMENULANGUAGE:Tosetthe
preferencediscmenulanguagewhenplaying.

◆

Optionalaudio/discmenulanguages:English,

French,Spanish,Chinese,Japanese,korean,
Russian,Thai,others.

◆

Audio/discmenulanguagedefault:English.

NOTES

◆

Audio/subtitle/discmenulanguagesare

effectivetoDVDonly.

◆

Ifthediscdoesnotrecordyourdesired

language,theplayerwillselectthedisc­specifiedlanguagestoplay.

◆

Selectingotherlanguages:PressUP/DOWN

ARROWtomovethecursortoOTHERitem,
pressSELECT.PressNUMBERbuttonsto
enteryourdesiredlanguagecodes,thenpress
SELECT.

5.

Parental:Tosettheparentalcontrolratingsto
preventchildrenfromwatchingtherestricted
contents.(Incasethediscsupportsthis
function.)

◆

Optionalsettings:KID,G,PG,PG-13,PGR,R,

NC17,ADULT,OFF.

◆

Default:OFF.

NOTE

On
English
Off
English
Off

-8-

◆◆Whenchangingtheparentalcontrolratings,apasswordisneeded.Refertothefollowingpassword

itemfordetailedsettings.

PASSWORD:Tosetafourdigitpasswordtoenableyoutochangetheparentalcontrolratings.

6.
Default:7890.

OLDPASSWORD
NEWPASSWORD
CONFIRMPWD

OK

7.

DEFAULT:Torestoreallsettingstothedefaultvalueexceptfortheparentalcontrolandpassword

settings.

2.5.5Usefulnotes

Inordertoprolongtheservicelifeofyourplayer,itisrecommendedtowaitatleast30secondsbefore

◆

youturnitonagainafterswitchingitoff.
Turnoffpowerafteroperation.

◆

Onlyusethepowersupplyofthenominalvoltage,otherwisetheplayerwillnotbeoperationaloreven

◆

bedamaged.
Somefunctionsoftheplayermaynotbeapplicabletosomediscs.

◆

Incaseofoccasionalplayerhalt,pleaseturnitoffandturnitonagain.

◆

ThisplayercannotplaysomeSVCDdiscswiththeCVDformat.

◆

WhentousetheAudioOutputofthisunit,pleaseminimizethephonevolumefirst.

◆

2.6Specifications

DVD VIDEO
SVCD,MPEG4

Disc Types

Output

Video

Characteristics

Audio

Characteristics

General

Specifications

Operating

Temperature

Operating

Humidity

VCD1.0,1.1,2.0
CD-DA
MP3

Analog audio output Stereo output,

Video Output
Video Amplitude 1.0Vp-p(75Ω)

Frequency 20Hz~20kHz(±1dB)
Signal-to-noise Ratio >90dB
Total harmonic distortion <0.01%

Power Supply DC 9V 2A
Power Consumption 12W
Dimensions 205mmX149mmX39.5mm
Mass 735g

5℃~35℃

15%~75%(no condensation)

Headphone output

◆◆Specificationsaresubjecttochangewithoutnotice.

Wedonotgraranteethatalldiscscanbeplayedsmoothlyduetothediscquality,discrecordingquality
andrecordingformat.

-9-

ChapterThreePrincipleorServicing

SectionOnePrincipleofthePlayer

3.1.1Blockdiagramoftheplayer

DL370Discomposedofdecodecircuit,servocircuit,audiocircuit,videocircuitandpowercircuit.

Theblockdiagramoftheplayerisshownasinthefollowingfigure3.1.1.1:

Loader

Feed,
mainaxis
drive

+9VIN

Discswitchand
APCcircuit

Focus,
trace
drive

conversioncircuit

DC-DC

+9VIN

U204

AT24C02

Servodrive
signalinput

VCC
Dv33

FLASH(16M)

Chargecontrolcircuit

Sw601

Screenoff
detectcontrol
circuit

BL_CLT#

STBT

MT1389E

Resetcircuit

components

Battery

BL_CLT

Ht6222

Buttonscontrol

VSAD

SDRAM()64M

Boostboard

IR

AL LOUT
AR

27MHz

LCDdrive

T102

ALIN

Audiofiltering/

amplifying

Headphone/

speaker

amplifying

LM4863

ARIN

ROUT

LSOUT

RSOUT

CVBS1

Figure3.1.1.1Blockdiagramoftheplayer

-10-

3.1.2PCBcompositionblockdiagramoftheplayer

PCBcompositiondiagramoftheplayerisshownasinthefollowingfigure3.1.2.1:

VOUT+

Battery
components

TEMP

Jk602

Chargeboard

GND

DCsocketboard

Loader

Jk603

VIN+9V

COUT-

9VIN

PGND

BATTY_LED

CHECK

COVER_SW

SP­SP+
SL+

SL-

LIMIT

Mainpanel

GND
STV1
STV2

CKV

U/D

OEV

VCOMO

GND

OEH
STH2
STH1

GND

CPH1

GND

VR

VG

VB

GND

VSDA

Xs801

Xs701

BLGND
BLCLT
BL+9V
+5V
+5V
GND
SR­SR+
SL­SL-

GND

Jk101

Xs101

A/B/C/D/E/F

Xs102

Figure3.1.2.1PCBcompositionfigureoftheplayer

V33

Xs501

BL9V

Loudspeaker

Jp2

Jp1

Driveboard

Jp3

Jp6

BL
CTL

Boostboard

BL
GND

TFT

LCD

GND
5VA
VGL
VGH
STV1
STV2
CKV
U/D
OEV
VCOM
VCOM
L/R
STH2
STH1
CPH1
CPH1
CPH1
5VA
GND
VR
VG
VB
VDD2
GND

3.1.3FunctionintroductiontoICoftheplayer

FunctionintroductiontoICoftheplayerisshownasinthefollowingfigure:

PCB board Location IC model Function
Main panel U401 PT2222A Buttons coding control

Drive board

Protection board QB1 S8232 Battery charge protection

Charge board

Boost board IC1 MP1026 Boost control

Decode board

U1 NJM3414AM VCOM signal amplifying
U2 G5105TBU DC-DC conversion

U601 S3F9454 8-bit single chip, charge control

U602 TL431

Three-end adjustable distributary reference
source

U603 LM358 Operational amplifier

U301 C4558 Audio amplifying (operational amplifier)
U803 AZ1117 Voltage regulating IC
U202 HY57V641620ET 64M SDRAM
U801 T102 Video coding, LCD drive

-11-

U204 24C02 EEPROM
U201 MT1389FE/E Decode chip
U901 AM5898 Servo drive, DC-DC control

Decode board

U502 LM393

Battery electrical charge detect (operational
amplifier)

U701 HWD4863 Headphone amplifying

U206,U802 LM1117H Voltage regulating IC (U206 1.8V/U802 2.5V)

U501 HS0038B3V Receiver
U203 29LV160BE 16M FLASH

-12-

SectionTwoUnitCircuitPrinciple

3.2.1Servoprocessingcircuit

1.DL370DadoptsSANYO62loaderandMTKdecodesolution(MT1389E+FLASH(16M)+SDRAM
(64M)).Theservocircuitiscomposedoffrontendsignalprocessing,digitalsignalprocessingIC
MT1389EanddrivecircuitAm5898,inwhichMT1389Eisalsothemaincompositionofdecodecircuit.

XS101

Feedelectricmachine

Mainaxiselectricmachine

Mainaxiscontrol
detectcircuit

Switchcircuit

APCcircuit

ABCDEFRFO

TK­TK+

FC+

FC-

SL+
SL-

SP-

SP+

D5898

FOSO

FMSO
TRSO

DMSO

IOA
MD11

LDO2
LDO2

MT1389

Figure3.2.2.1Servoprocessingcircuitblockdiagram

2.Workingprinciple:afterpoweronorturningoffdoor(doordetectswitchSW601/SW602on
chargeboardshoutsoff),loaderlaserheadbeginstoreset,focusandmainaxisbegintorotate,laser
headbeginstoidentifydiscinformationtojudgethediscisCDorDVDtofacilitatetomakethe
correspondingacts.Atthesametime,Mt1389alsoadjustslaseroutputpowerthroughlaserpower
controlcircuit.Whenloaderreadsdiscinformation,afterphotoelectricconversion,A,B,C,D,E,F
signalsareformedtogivetoMt1389(DVDhasA,B,C,Dsignalsonly)andTereforesignalandthe

h
inputfrompin2~11,18,19ofMT1389.AfterMT1389internalpre-amplifyingprocessing,nowsignalare
dividedintotwopartsinsideMT1389:

-13-

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.AfterprocessingofamplificationbyVGAvoltagecontrolamplifierandequalization
frequencycompensationinsideMT1389,anotherpartofsignalsarechangedintodigitalsignalsthrough
internalA/Dconverter.WhenloaderisreadingCD/VCDsignals,thesesignalsareconductedEFM
demodulationinsideMT1389,afterCIRC(Cross-InterleavedReed-SolomonCode)errorcorrectionis
finishedinside,itoutputstorearstateforaudio/videodecoding;whenloaderisreadingDVDsignals,
thesesignalsareconductedESMdemodulationinsideMT1389,andthensenttolatterstagefor
decodingafterfinishingRSPCerrorcorrectioninside.ComparedwithgeneralDVDplayers,this
machinehasnodiscin/outcircuitandmanualopeningmethodisadopted.Whenpin148ofMT1389Eis
highlevel,systemrecognisesthatthedoorhasbeenopened,when itislowlevel,themachine
recognizesthatthedoorhasbeenclosed.

3.Loadersignalsintroductionisshownasfollows:

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

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

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

-14-

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

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.

3.2.2CD/DVDswitchcircuit

1.CD/DVDswitchcircuitisshownasinthefollowingfigure3.2.2.1:

R103
10K

R104
10K

3904-S

R105
100K

Xs101

2SK3018-S
17
18

R102
100K

V101

VD101

VD102

2SK3018-S

Figure3.2.2.1CD/DVDswitchcircuit

AVCC

IOA

MT1389E

-15-

2.Workingprinciple:afterdiscisloadedinmachine,IOAportisdefaultedhighleveltomakeVd102
saturationonandformloopwithCDlaserpowercontrolcircuitonloader,atthesametimeIOAalso
reachesloaderPDICforswitch,discbeginstorotate;whenservoprocessingsystemrecognisesthat
thediscinsidemachineisnotCD,IQApinoutputslowleveltomakeVd102cutoff,Vd101onandform
loopwithDVDlaserpowercontrolcircuitonloadertocarryouttheactionofreadingDVDdisc.After
doorisopened,IOAstillkeepsthestatebeforedoorisopened.Ifmachinecannotrecogniseswhichthe
discis,IQApinwillswitchalwaysuntilnodiscisreadoutorjudgedbysystem.

Note:V303,V304areMOSpipes(pressuredropissmallwhensaturationon).

3.2.3Laserpowercontrolcircuit

1.Laserpowercontrolcircuitisshownasinthefollowingfigure3.2.3.1:

LDO-AV33

R106

4.7R

23DVD

XS101

19CD

Figure3.2.3.1Laserpowercontrolcircuitdiagram

VD103
2SB1132-S

VD104

2SB1132-S

R107

4.7R

C106
106

LDO2

LDO1

C107
106

L104
601

LDO-AV33

DV33

22

20/21

MT1389

23

2.Workingprinciple:pin20/21ofMT1389islaserpowerdetectsignalinputpin,pin21isDVDlaser
powerstrong/weakdetectsignalinputpin,pin23isVCDlaserpowerdrivecontroloutputpin,pin22is
DVDlaserpowerdrivecontroloutputpin.

WhenreadingVCDdisc,laserpowerbecomesweak,voltageofMDIIpindecreases;whenvoltage
ofMT1389decreases,voltageofpin19ofXS101increasestoreachthefunctionofboostlaserpower;
whenlaserpoweristoostrong,voltageofMDIpinincreasestomakevoltageofMT1389increaseand
voltageofpin19ofXS101decreasetoreachthepurposeofloweringlaserpowertoformaautomatic
powercontrolcircuit.WhenreadingDVDdisc,pin21isdetectsignalinputpin,pin22isdrivecontrol
outputpinandtheworkingprincipleisthesamewiththatwhenplayingVCDdisc.

-16-

3.2.4Mainaxiscontrolcircuit

1.Mainaxiscontrolcircuitisshownasinthefollowingfigure3.2.4.1:

C113
222

R108
680K

104/DNS

C114

OPO

R109
0R

ADIN

OP­OP+

MT1389E

R111

DNS

R112
1R

R113
150K

C115
222

R114
680K

V1P4

6
5
4
3
2
1

XS102

PH-6

R110

150K

SP­SP+
SL+
SL-

LIMIT

Figure3.2.4.1Mainaxiscontrolcircuitdiagram

2.Workingprinciple:MT1389Ehasacomparatorcomposedofoperationalamplifierinside.When
doorisopened,discisalwaysrotating,soabrakingsignalisrequiredtomakemainaxiselectric
machinestoprotatingimmediatelytorealizethepurposethatdisccanstoprotatingduringashort
periodafterdoorisopened.Inthecourseofplaying,if“OPEN”buttonispressed,mainaxisdrivesignal
disappears,butmainaxiselectricmachineisstillinrotatingstatebecauseofinertiafunction.The
inducedvoltageachievedbyinducedelectromotiveforceproducedbyelectricmachinerunningon
samplingresistorR321,R340,aftersamplingthroughresistorR112/R110/R113,inputtopin35,36of
MT1389,andoutputfrompin34afterMt1389amplifyingprocessinginside,afterD/Aconversionand
relevantprocessinginsideMt1389,aninstantelectricmachinereversebrakingsignalisoutputtedto
makemainaxiselectricmachinespeeddown.Thismachineismanualopen/closemeans,sodiscisstill
rotatingafterdoorisopenedbutitwillstopverysoon.

3.2.5DC-DCswitchcircuit

1.DC-DCswitchcircuitisshownasinthefollowingfigure3.2.5.1:

PGND

PGND
+9VIN

EN

1

SGND

2
3
4
5
6
7
8

9
10
11
12
13
14
15
16
17
35

CT2
COMP2

C906

SW2

68pF

IPK2
+9VIN

F+
F­VCC
FOSO

R905

FMSO

10K

SL+
SL- SP+

R906

T- T+

10K

EN2
CT2
COMP2
SW2
IPK2
PVCC1
PVCC2
VOFC+
VOFC­VCC1
VINFC
VINSL
MGND
VOSL+
VOSL­MGND
VOTK+
MGND

AM5898N

COMP1

PGND2
PGND1

VOSP+

BIAS

MUTE

EN1
CT1

SW1
IPK1

PGND

VCC2
VINTK
VINSP

VOSP-

MGND
VOTK­MGND

34

SBIAS

33

SELECT

32
31
30

COMP1

29

SW1

28

IPK1

27
26
25
24

VCC

23

TRSO

22
21

SP-

20
19
18
36

PGND

R1
10K

C907
68pF

DMSO

SW2

PGND

Figure3.2.5.1DC-DCswitchcircuitdiagram

R910

0R

1.2K

R911

750

R914

R913
680k

C908
102

R915
10K

R912

0.1

COMP2

QB902
AO3419

PGND

L902 47uH

1

D904
MBRS340

R916

3.6K

C909

104

2

100uF/16V

VCC

TC907

-17-

2.Workingprinciple:whenswitchisclosed,AM5898islowlevel,DC-DCcircuithasno

EN1EN2of
function,machineisinpoweroffstate,butafterSw901isdisconnected,ENendishighlevel,DC-DC
circuitbeginstowork.TakeVCCforinstance,wegiveexplanationtovoltageregulatingofcircuit:

DC-DCcircuitbeginstooscillate,itsworkingfrequencyisin240khz,Swpinoutputson/offsignal.
WhengridelectrodeofQB902ishighlevel,MOSpipeison,+9VpowerreachesL902TC907through
MOSpipetosaveenergyforinductorandchargecapacitor,D904freewheelingdiode,whenMOSpipe
iscutoff,Ldischargesenergyanditsinducedelectromotiveforcemakesdiodeon,atthesametime
TC907dischargestheloadwithcurrentdirectionunchangedtoformaseriesconnectionswitchvoltage
regulatingcircuit.Whenoutputvoltageisonhighside,ithasthefollowingchanges:VCCincreases
COMP2increasesSW2on/offfrequencyturnslowVCCdecreases.Whenvoltageisonlowside,the

―

―

courseisoppositetothatofincrease.R912isover-currentprotectioncircuitsamplingresistor.(DV3.3
circuitprincipleisthesamewiththatofVCC)

Asshowninthefigure3.2.5.2,whenmachineisinDVD,SELECTpinofdecodechipoutputsahigh
leveltomakeservodrivecircuitenterworkingstateandreachVd1saturationonatthesametime,
VD901iscutoff,Qb904iscutoff,DCOUThasnopoweroutput.Whenmachineisswitchedtoexternal
input,SELECTpinofdecodechipoutputsalowleveltomakeservodrivercircuitnotwork,VD1iscutoff,
VD901issaturated,QB904issaturated,DCOUToutputsVCCtoprovideforTVbox.(CON3isDC
outputsocket)

JK901

1
2
3

CON3

VCC

R3

100R

R902
10K

QB904
AO3419

R903
0R

TC905
106

SELECT

R904
1K

Figure3.2.5.2DCOUTcontrolcircuit

VD1

3904

GND

VD901
3904

3.RelationshipofeachcontrolpinofAM5898

AM5898hasbuilt-inDCDCpowermanagerandcollaboratewithperipheralcircuittoprovideload

－

withtherequiredvoltage.Thiscircuitiswithover-voltageprotection,over-currentprotectionand
stabilityprotectionfunction,inwhichAM5898isalsowithservodrivefunction,whichhasbeen
introducedinservocircuitsection.Therelationshipofeachpinof

AM5898isshownasinthefollowing

table:

Truthtable(:active:inactive:dontcare)

○×－’

-18-

MUTE EN1 EN2 MOTORCHANNEL DC-DCCTRL1 DC-DCCTRL2

H

—

— —

L L L × × ×

— — ○ — —

H

— — ○ —

H

— — ○

3.2.6Batteryvoltagedetectingcircuit

1.Batteryvoltagedetectingcircuitisshownasinthefollowingfigure3.2.6.1:

U502A
LM393

1

7

VCC

DV33

R509

4.7K

R510

4.7K

R511

33R

R512

33R

POWER_OFF

LOW_BAT

+9VIN

R504
27K

R505

1.2k

R506
18k

R507
47K

R508
47K

106

TC501

GND

6
5

L503
10UH

2
3

GND

U502B

LM393

Figure3.2.6.1Batteryvoltagedetectingcircuit

2.Workingprinciple:U502isanoperationalamplifierandusedasacomparatorincircuit.Reverse
inputterminalinputsaVCC5V,throughtworesistorspartialpressure,thereferencevoltage(2.5V)is
achieved;throughpartialpressurebyR504R505R506of

+9VIN,twogroupsofvoltageareachievedto

supplyforthein-phaseinputendofoperationalamplifier;whenvoltageofin-phaseinputendisless

2.5V,theoutputpinofoperationalamplifieroutputsalowleveltodecodechiptoperformthe

than
correspondingacts.Inthismachine,aftercalculation,weconcludethatwheninputvoltageislessthan

6.5V,pin7ofoperationalamplifieroutputslowlevelandmachinescreendisplayslowbattery;when
inputvoltageislessthan6.1V,pin1ofoperationalamplifieroutputslowlevelandmachinescarriesout
power-offaction.

-19-

3.2.7Audiooutputcircuit

1.Audiooutputcircuitblockdiagramisshownasinthefollowingfigure3.2.7.1:

HP_L
HP_R

JK701

186

AL

LOUT

6

7

6

16

5

RSOUT-

U201

MT1389E

184

AR

U301
4558

ROUT

2

1

15

U701

LM4863

3

18

LSOUT-

LSOUT+

RSOUT+

Drive
board

JP3

ALIN ARIN

AUDIO_INJk301

Figure3.2.7.1Audiooutputcircuitblockdiagram

2.Workingprinciple:signalreadoutbydisc,throughaudioandvideodecoding,converseaudio
signalinMT1389Ebuilt-inDACcircuittoanalogaudiosignalandoutputleftandrightchannelanalog
signalsfrompin186,184ofMT1389E,throughTc301,Tc302,coupledtopin6,2ofU301andthen
outputfrompin1,7ofU301throughbeingfilteringandamplifyingbytheactivefiltercomposedofU301
andsendtoaudiooutputterminalandheadphoneamplifyingoutputcircuit.

(1)Headphoneamplifyingoutputcircuit

Asshowninthefigure3.2.7.2,aftervolumeadjustmentoftheaudiosignalsoutputtedfromU301
throughVR701,inputfrompin6,15ofU701respectively;audiosignalsafterbeingamplifiedoutput
frompin5,16ofU701toheadphonesocketforperformconversebetweenheadphoneandspeaker.

LOUT
ROUT

VR701

50K*2

R701
20K

C701 105

C702
105

R702
20K

R703
DNS

R704
DNS

R70536K

SPGND

C705
225

R706
36K

SP5V

C706

R712

104

1K

SPGND

TC703
100uF/16V

LM4863MTE
U701

R713

TC704

100uF/16V

100K

C707
104

SPGND

L701

TC701
100U/16V

HPL

R707
1K

SPGND

HPR

SP5V

10UH

GND

R709

R710

R711
100K

HP-V1

D701
1N4148

VCC

TC702
100U/16V

0R

0R

HP-L
HP-R

JK701

4
3
2
1

SPGND

HP

Figure3.2.7.2Headphoneamplifyingoutputcircuitdiagram

-20-

(2)Outputmodeswitchinheadphoneandspeaker

LM4863drivespeakeradoptsbridgeconnection.Thatdrivesheadphoneissingleendingworking
modeanditsswitchbetweenthemisfulfilledbyHP-INpin.Asshowninthefigure3.2.7.2,when
headphoneisinsertedintoajack,a4V~VDDvoltageisaddedtoHP-IN,whichmaycutoffinternal
operationalamplifyingmoduleAmp2AandAmp2Btomaketheloadconnectedbybridgeinvalid.NowIC
liesinsingleendingworkingmodeandspeakerhasnosoundoutput.Whennoheadphoneisconnected
tojack,partialpressureresistanceofR711,R707makesthevoltagesuppliedtopinHP-IN(pin16)close
to50mV,driveAmp2AandAmp2Bareinworkingstatetomake4863workinbridgemodeandtransmit
tospeakerthroughdriveboardtomakespeakerhassoundoutput.

3.2.8Screenoffdetectcontrolcircuit

1.Screenoffdetectcontrolcircuitisshownasinthefollowingfigure3.2.8.1:

R602
10K

VCC

GND

R601
1K

SW601

SW2

升压板

BL_CTL

VCC

GND

8050

VD602

R604

1K

R605

1K

BL_CTL#

R603
1K

VD601
8050

Figure3.2.8.1Screenoffdetectcontrolcircuit

STBT

45

MT1389E

158

2.Workingprinciple:whenswitchisoff,pin45ofMT1389detectslevel,pin158outputslowlevelto
makeBL_CTLlowlevel,boostboardstopsworking;whenswitchisdisconnected,STBTishighlevel,
pin158ofMT1389outputshighleveltomakeBL_CTLhighlevel,boostboardbeginstoworkandlighten
backlightboard(whenswitchisinpanelposition,screencloseisoff,screenopenisdisconnected).

-21-

3.2.9VideocodingandLCDTFTdrivecircuit－

1.VideocodingandLCDTFTdrivecircuitblockdiagramisshownasinthefollowingfigure3.2.9.1:－

U201

MT1389E

YUV0

YUV1
YUV2
YUV3
YUV4
YUV5
YUV6
YUV7

T102_RESET

MT1389_CLK

SDA/SCL

IOR

RGBsignal

IOG

amplifying

IOB

circuit

STV1

U801

STV2

T102

Externalvideoinput

Figure3.2.9.1VideocodingandLCDTFTdrivecircuitblockdiagram－

CKV

U/D

VCOM

OEV

L/R

OEH

STH1

STH2

CPH1

VR

VG
VB

Jp2

VCOMsignalamplifying

-10V

DC-DCconversion
Voltagedoubling
rectificationcircuit

Boostboardcomponents

Jp1

Driveboard

VGH
VGL

+15V

-10V

2.Workingprinciple:decodechipoutputsdigitalvideosignalanddirectlyinputstoT102forcoding
inthemeansofdatainparallel(8bit),andrestoredigitalsignalto3basecoloursignalthroughinternal
DACcircuitandareoutputtedbypin62,65,68andsenttoaamplifyingcircuitcomposedofsingletriode.
Shownasinthefigure3.2.9.2,conversesmallcurrentsignalofRGBintovoltageoutputmeanstodrive
LCDscreentodisplay.

VCOMsignalamplifyingcircuit:VCOM,afterU1(NJM2414)amplifying,outputsfrompin6,7to

displayscreenandisusedasthecolourfulfilteringplateof displayscreen.

BIAS

C845

104

+5VA

GND

IOR

R828

150

R831

39K

C841

106

Figure3.2.9.2Amplifyingcircuit

R834

10K

1

R840

100

GND

R837
430

C842

VD801
2N3904

R843

10K

106

C844

100pF

GND

C843

104

VR

-22-

3.Voltagedoublingcircuit
Workingofdisplaydrivecircuitrequireshighvoltage,so+5Vvoltageisvoltagedoubled,shownas

inthefollowingfigure3.2.9.3:

D1
BAT54S

LX

C16
474

C17

474

3

3

D2
BAT54S

2

1

2

C20

C19

VOUT1

1

Figure3.2.9.3Voltagedoublingrectificationcircuit

C18
104

105

105

GND

R11

5.1K

C21

105

Q1
8050

D5

BZT52C16V

C22
106

C23
104

L5

560R

R15
10K

VGH

+5Vpower,throughDC-DCconversionconductedbyU2,istransmittedtothetwogroupsofvoltage
doublingrectificationcircuitcomposedofD1-D4toperformrectificationtopowersentfrompin1ofU2.
WhenLXinputisnegativehalfcircle,about-14VvoltageisformedincollectorelectrodeofQ2,-10VGL
voltageoutputtedafterD6voltageregulatingisprovidedtoVCOMsignalamplifyingcircuitanddisplay
screen.WhenLXinputispositivehalfcircle,thevoltagedoublingrectificationcircuitcomposedbyD1,
D2,C19cannotbeuptovoltagerequiredbyVGH,so7VDCcurrentachievedafterD7rectificationis
overlappedinpin1oftovoltageregulatingcircuitQ1,D5forvoltageregulatingandthenoutput+15V
DCpowertoprovidefordisplayscreen.+15VisoutputtedbyJP1todisplayscreenthroughsocketJP2
todriveboard.InwhichJP3ondriveboardmainlytransmitthesignalandpowerrequiredby
loudspeakerandboostboard.

4.Boostboard(ifthisPCBboardisdamaged,itwillnotbeservicedbutchangeitdirectly):howtojudgethe
boostboard:1)Makedetectingheadofoscillographclosetohighvoltageoutputline(payattentionnottotouchthe
line),asinewavewithabout60Kwillbeviewedfromoscillograph,whichmeansthatboostboardhasACoutput.
Themainfaultofboostboardisthatthereisnobacklightorbacklightisdark.

5.Functionintroductiontodisplayscreenpinisshownasinthefollowingtable:

Pin Symbol I/O description

1 GND - Ground
2 VCC P Power line for logic
3 VGL P Gate driver negative voltage
4 VGH P Gate driver positive voltage
5 STV1 I/O Gate driver START PULSE 1
6 STV2 I/O Gate driver START PULSE 2

-23-

7 CKV I Gate driver scanning clock
8 U/D I Up/Down scanning change
9 OEV I Gate driver output enable

10 Vcom I

HORIZONTAL SYNCHRONIZATION SIGNAL(Voltage applied to color filter
substrate)

11 Vcom I Voltage applied to color filter substrate
12 L/R I Right / Left scanning change
13 MOD I Sampling mode change (H: Simultaneous, L: Sequential)
14 OEH I LATCH PULSE FOR COLUMN DRIVER
15 STH2 I/O Source scanning start signal 2
16 STH1 I/O Source scanning start signal 1
17 CPH1 I INPUT DATA CLOCK
18 CPH1 I INPUT DATA CLOCK
19 CPH1 I INPUT DATA CLOCK
20 Vcc P Power line for logic
21 GND P Ground
22 VR I Red video signal
23 VG I Green video signal
24 VB I Blue video signal
25 AVdd P Power
26 AVss P Ground

6.Scanningmodeselectionisshownasinthefollowingtable:

Scan control input setup

U/D L/R STVR STVL STHR STHL

GND Vcc O I O I

Vcc GND I O I O

GND GND O I I O

Vcc Vcc I O O I

Start up pulse I/O state

Scan mode

Up→down Left→right
Down→up Right→left
Up→down Right→left
Up→down Left→right

-24-

3.2.10Chargecircuitandprotectioncircuit

1.Battery:Lithium-ionpolymerchargeablebatteryalwaysfollowsthemethodofconstantcurrent
firstlyandthenconstantvoltage,andthenchargeinconstantvoltagestate.

2.Lithiumbatteryprotectionpart(thisPCBboardwillnotbeservicedinsidebatterycomponents)is
dividedintothreetypes:A)Over-voltageprotection,thatischargeprotection;B)Undervoltage
protection,thatisdischargeprotection;C)Currentprotection(shortcircuitprotectionincluded).The
protectiondelayanddelaytimeoftheabove3itemsaredifferent,from1secondto0.1secondandto
10mswithdelayadjustable.Twolithiumbatteriesprotection,nomatteovervoltageprotectionorunder
voltageprotection,theyaretherelationshipof“or”.Onlyoneofthetwocoreshasthecondition,the
protectionisavailable,whichrequiresthatthetwocoresofagroupofbatteryarebalancedonthewhole,
orelsethewholecapacitywillbeseverelydamaged(wheninovervoltageprotection,thecoreofhigh
voltagecausesovervoltageprotectionfirstly;wheninundervoltageprotection,thecoreoflowvoltage
causesprotectionfirstly).

3.Chargepart(chargeboardisaindividualPCBinsidemainunit):coreofchargepartissinglechip
thatadoptsA/Dconversionwith10-bit.8-bitsinglechip(S3F9454))ofPWM(12bits)SAMSUNG
companyhasthefollowingfeatures:

(1)Singlechipiswith10-bitA/Dconversionitself,theprecisionofA/Dconversionis1/1024,the

negativevoltageofgeneralNI-MHis3-6mv(6mv/1500mv=1/250),whichcanmeetthedemandsgreatly.

Theprecisionoflithiumbatterymaybeupto5mv.Consideringthetesterror,itmaybeupto20mv,

thatis4.2V+/-0.02v.Thehighprecisionandstrongpointareobvious.

(2)UsePWM(pulsewidthmodulator)ofsinglechipitselftodirectlycontrolDC/DCconversion.The
controlmethodisprovidedbysoftwaretoachievedifferentconstantcurrentandconstantvoltagecurve
(differentchargemeansmaybedesignedaccordingtoclients’requirements),sothewholelineissimple,
withlowcost,highreliability,highefficiencypowerconversionandlessheatradiation.

(3)MaychargeNI-MH,NI-CD,LI-IONbatterywell.Howtojudgewhetheritisfullycharged:A)max
voltage;B)maxtemperatureincrease;C)negativevoltage;D)longestchargetime.Itcanbetested
quicklyafterbatteryisfullychargedandloadedagain(within15minutes)andstopcharging(thispointis
veryimportanttoNIMHandNICD,whichcanpreventoverchargetodamagebattery),whenbattery
voltageislow,usesmallcurrenttochargetoresumethedamagedbattery.

±

4.Workingprinciple:whenexternalpoweradapterisadoptedtosupplypower,powerarrivesatVIN
pinthroughsocketboardandisdividedintotwoways:A)arriveatdecodeboard(VOUT+)directly
throughVD602;B)providedforchargecircuit.Aftervoltageregulating,thevoltageregulatingcircuit
composedbyV601,U602providesworkingvoltageforU601.U601ischargemanagementcontrol
singlechip.

-25-

PowersupplyofCPUadoptsTl431andanNPNtriode.Therearemanyelements,butprecisionis
high,easytocorrectandupto1%,andtestworkisless.ThepowersupplycircuitiscomposedofU602
andV601,etc.

V605,V604,V603,QB602composeswitchDC/DCcircuit;V603andV604composestandardpush

pullcircuittodriveQB602tomakeQB602hasgoodswitchwaveformtodecreaseheatradiation.

QB602,L601,TC603andVD601composeclassicSTEPDOWNcircuit.WhenQB602ison,current
suppliespowerforbatteryononehandandsaveenergyforinductorontheotherhand.WhenisQB1cut
off,theelectric energyininductordischargesthroughVD601tochargebattery.

LM358isclassicin-phaseamplifyingcircuit.Thereasonofaddingamplifyingcircuitistodecrease
resistancetestandheatradiation.

ThefunctionofQB603istheexternalpowersupplycontrolend.WhenVINislowlevel,QB603ison,
batterysuppliespowerforload;whenVINishighlevel,adaptersuppliespowerforload.

QB601andV602composeprotectioncircuit.Whenchargecircuitorbatteryhastrouble,MOS_SW
outputshighlevel,QB601cutsoff,9Vstopssupplyingpowerforbattery.

3.2.11Controlpanelcircuitandremotecontrolcircuit

PanelcontrolcircuitadoptsHT6222 controlcircuittocontrolanditsworkingpoweris3.3V.Afterwe
inputbuttonsinformation,serialdatasignalareachievedthroughHT6222internalprocessingandsent
todecodeboardthroughVSDApinandtoIRpin(102)ofdecodechipthroughaseparationdiodeVd201.
Thefunctionofseparationdiodeistopreventthemutualinterferenceofbuttonsfunctionandremote
controlfunctionandincorrectorderbeingcarriedout.

3.2.12Decodecircuit

1.Decodecircuitblockdiagramisshownasinthefollowingfigure3.2.12.1:

AL

AR

YUV0~YUV7

T102_RESET

MT1389_CLK

SDA/SCL

Audioamplifying

U301

27M

T102
U801

Loadercomponents

AM5898

Resetcircuit

FOSO
FMSO
TRSO

DMSO

URST#

101

186

184

MT1389E

93/94

U203
FLASH

Figure3.2.12.1Decodecircuitblockdiagram

U202
SDRAM

-26-

U204

24C02