BBK DK1410, DK1430, DK1440, DK1450, DK1460SI Service Manual

...

DK1410SI DK1440SI

DK1470SI DK1480SI

service manual

Catalog

Chapter One About Maintenance

1.1 Safety precautions

1.1.1 Power supply

1.1.2 Precautions for antistatic

1.1.3 Precautions for laser head

1.1.4 About placement position

1.2 Maintenance method

1.2.1 Visualized method

1.2.2 Electric resistance method

1.2.3 Voltage method

1.2.4 Current method

1.2.5 Cutting method

1.2.6 Element substitution method

1.2.7 Comparison method

1.3 Required device for maintenance

Chapter Two Functions and Operation Instructions

2.1 Features

2.2 Controls and functions

2.2.1 Front panel controls

2.2.2 Rear panel connections

2.2.3 VFD display general view

2.2.4 Remote control general view

2.3 FUNCTION SETTINGS

2.3.1 Function selection and change

2.3.2 Language settings

2.3.3 Image settings menu

2.3.4 Sound settings menu

2.3.5 Playback settings

2.3.6 Karaoke settings menu

2.3.7 Preference settings

2.3.8 Parental control

2.3.9 Initial setup menu

2.3.10 Reset to defaults

2.3.11 Exit settings menu

2.3.12 Channel delay set-up

Section One Principle of the Player

3.1.1 Function introduction

3.1.2 Block diagram principle of the player

Section Two Unit Circuit Principle

3.2.1 Decode circuit

Chapter Three Principle and Servicing

3.2.2 Servo circuit

3.2.3 Laser power control circuit

3.2.4 Main axis control circuit

3.2.5 Control panel circuit

3.2.6 Power circuit

3.2.7 Audio power amplifying circuit

3.2.8 Output circuit

3.2.9 Video circuit

Section Three Servicing Cases

3.3.1 Servicing cases

3.3.2Troubleshooting flow chart

Section Four Servicing Parameters

3.4.1 Signal waveform diagram

3.4.2 Key point voltage

Section Five Function Introduction to IC

3.5.1 function introduction to MT1389E

3.5.2 Function introduction to SDRAM

3.5.3 Function introduction to FLASH

3.5.4 Function introduction to D5954

3.5.5 Function introduction to 24LLC020

3.5.6 Function introduction to 74HCT125

3.5.7 Function introduction to Cd4052

3.5.8 Function introduction to SAA6588

3.5.9 Function introduction to Cs5340

3.5.10 Function introduction to 4558/4580

3.5.11 Function introduction to TLV272

3.5.12 Function introduction to TAS5508

3.5.13 Function introduction to TAS5112

3.5.14 Function introduction to 5L0380

3.5.15 function introduction to LM431A

3.5.16 Function introduction to Hs817

3.5.17 Function introduction to Pt2579

Chapter Four Disassembly and Assembly Proces

Chapter Cinque

Section One PCB board

Section Two circuit diagram

PCB board & Circuit diagram

106

Chapter six BOM List

112

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 -

Functions and Operation Instructions

2.1 Features Formats:

Digital video playback of DVD-Video, Super VCD and VCD formats.

MPEG-4 compatibility:Playback of Divx 3.11, Divx 4, Divx 5, Divx pro and XviD formats.

Playback of music discs in DVD-Audio format.

Playback of musical compositions in DC-DA and HDCD formats.

Playback of compressed musical files in Mp3 and WMA formats.

Playback of Karaoke-discs in DVD, VCD and CD+G formats.

Playback of photo al bums, recorded in Kodak Picture CD and JPEG digital formats.

Audio:

192 kHz/24 bit audio D/A converter.

Coaxial and optical audio outputs, providing digital sound playback in Dolby Digital/LPCM formats.

Coaxial and optiacl audio inputs, providing connection of external digital signal sources.

Stereophonic audio outputs for connection to TV and amplifier.

Integrated digital multi-channel sound decoders, providing playback of Dolby Digital and DTS

audio tracks.

Integrated Dolby Pro Logic ll decoder, provding transformation of stereophonic signal to multi-

channel one.

Microphone input providing karaoke functions.

Headphones output.

Video:

108 kHz/12 bit video D/A converter.

Progressive scan(Y Pb Pr)video signal output, securing high resolution and absence of image

flicker.

Composite and component(Y Cb Cr)S-video and RGB/SCART video outputs, providing advanced

switching capabilities.

NTSC/PAL transcoder.

Support of many camera angels, dubbed languages and subtitles.

Sharpness, Gamma, Brightness, Contrast, Hue and Saturation adjustment.

Miscellaneous:

Support of CD-R/CD-RO, DVD-R/DVD-RW, DVD+R/DVD+RW

FM/AM tuner with RDS support.

USB port, providing playback of files of supported formats from external flash-memory devices.

KARAOKE+, providing extended karaoke features.

Easy to use on-screen menu in Russian.

Support of Russian file names, ID3 tags and CD-text.

"Memorty” function which can load the last disc position on stop.

"Capture” function, auto loading selected bookmarked image as the wallpaper.

Q-Play function that will bring you to the main movie title and skip unskippable commercials.

Virtual control panel function makes your control of the device much easier when playing the

movie.

Chapter Two

- 4 -

Auto protecion of TV screen.

Child lock, parental control(protection against playing undesirable discs)

Auto voltage selection(~110-250V)and short-circuit protection.

2.2 Controls and functions

2.2.1 Front panel controls

STANDBY/POWER button

Press to switch the device on/into standby.

Disc tray

OPEN/CLOSE button

Press to open/close the disc tray.

PREV button

Press to playback from the previous bookmark

NEXT button

Pres to playback from the next bookmark

REW button

Press to playback fast reverse/radio station

tuning

Button

FWD

Press to playback fast reverse/radio station

tuning

2.2.2 Rear panel connections

SOURCE button

Press to switch between DVD-receiver/Audio

input/Tuner/Digital audio input.

PLAY/PAUSE button

Press to playback/pause

STOP button

Press to stop the playback

Microphone input

VOLUME adjuster

Press to adjust volume.

VFD display window

Headphones input

USB port

AM Antenna input

FM Antenna input

Left front speaker input (output from the build in

amplifier)

Right front speaker input (output from the build-in

amplifier)

- 5 -

Right Surround speaker input (output from the

build-in amplifier)

Audio input

Stereophonic audio output

Component video output Y Cb (Pb) Cr (Pr)

Composite video output

Center speaker input (output form the build-in

amplifier)

Subwoofer input (output from the build-in

amplifier)

Left Surround speaker input (output from the

build-in amplifier)

2.2.3 VFD display general view

MP3-disc

CD-, VCD-or SVCD-disc

DVD-disc

Repeat

AM/FM

Radio tuning mode

Tuner tuning mode

Stereo

S-Video output

SCART-type AV connector

Coaxial digital audio output

Optical digital audio output

Optical digital audio input

Coaxial digital audio input

Dolby Digital

Programmed radio station

Friquency

Playback time

Chapters or tracks

Playback or pause

PBC

2.2.4 Remote control general view

EJECT button

Press to open/close the disc tray.

DVD button

Press to switch to DVD mode

AUDIO button

Press t switch to audio input mode

DISP button

Press to display the disc information

LANG button

Press to change the canuage

SLEEP button

Press to turn the sleep mode on

Q-PLAY button

Press to tum the Q-play mode on

EQ button

Press to adjust the equalizer

BASS+/- button

Press to adjust subwoofer

BOOST button

Press to bass boosting

BROWSER button

Press to turn on/off browser function

JOG DIAL wheel

Functions are set manually. Default function:

zoom

SETUP button

Press to switch to setup mode.

Button

Press to capture and bookmark image for the

wallpaper

Button

Press to start reverse or forward scanning

- 6 -

SKIP/RESET +/-

Press to switch between files on disc/tuned radio

stations

A-B buttons

Press to repeat the selected portion

REPEAT button

Press to repeat playback

CH+/CH- button

Press to change the acoustic channel

MUTE button

Press to change the acoustic channel

VOLUME+/- button

Press to adjust the volume

SLOW button

Press to switch to slow down the playback

PLAY/PAUSE button

Press to play/pause the playback

STOP button

stopped/playback from the previously meorized

point.

HDMI button

Press to switch to HDMI mode.

SUBT button

Press to change the subtitles language

ANGLE button

Press to change the camera angel

RADIO button

Press to switch to radio mode

KARAOKE button

Press to set the karaoke functions

USB button

Press to switch to USB mode

Button

Press to switch the device on/into standby

Press to stop the playback

Button

Press to turn on/off the virtual control panel

CANCEL button

Press to go one level back/cancel current

operation

OK button

Press OK for confirmation of use it like joystick

during navigating in MENU

MENU button

DVD-disc menu/PBC function

GOTO button

Press to playback from the target place

Numeric buttons

ST/5.1 button

Press to switch between STEREO/5.11CH

TREBLE +/- button

Press to adjust the tone

ECHO button

Press to adjust the echo function of the

microphone

MEM button

Press to memorize the point where playback was

- 7 -

2.3 FUNCTION SETTINGS

2.3.1 Function selection and

change

Press the SETUP key to show the setup menu. You will see the following image on the screen, as shown on the figure: Select the desired menu item using the jog Dial; Press OK confirmation.

1.For example, if you wish to change the image

sellings, you have to select the lmage item and press the OK or GIGHT key of the cursor joystick.

2.Using the jog Dial, select the desired item and

press OK or RIGHT key of the cursor joystick. Fox example, select the Sharpness item. Settings will appear on the screen. Then select the desired sharpness level and press OK for confirmation.

3.Press LEFT key of the cursor joystick for exit to

previous menu level.

4.Press SETUP to exit setup menu.

# Default option: English

2.DVD-menu: Selection of disc menu language.

3.Soundtrack selection of translation language #

Options: Russian, English, Estonian,

Lithuanian, Kazakh, Romanian, Belarusian, Ukrainian, Chinese.

Default: English.

Selection of other languages: Select the OTHERS item using the jog Dial and press OK. Enter the language code using the number

buttons and press OK.

If the language you select is not recorded on

the DVD disc, another available language will be used.

4.Subtitles: Selection of subtitles language #

Options: Off, Urssian, English, Estonian,

Lithuanian, Kazakh, Romanian, Ukrainian and Chinese.

Default option: Off. #

Selection of other languages: Select the

OTHERS item using the jog Dial and press OK. Enter the language code using numeric buttons and press OK.

If the language you selected is not relcoded on

the DVD disc, another available language will be displayed.

2.3.3 Image settings menu

1.TV system: TV system selection. #

Options:Auto, PAL, NTSC. #

Default option Auto.

2.TV scan mode: scan mode selection #

Options: Progressive, interlaced. #

Default option: interlaced #

Progressive scan is transferred only via a component video output. #

Before switching to progressive scan, make sure that your TV set supports this operation mode.

2.3.2 Language settings

1.Menu: interface language setup Options: Russian, English, Ukrainian.#

- 8 -

3.TV Format: image ratio settings

Options: 4:3 pan&scan, 4:3 letterbox and 16:9 TV.

Default option: 4:3 pan & scan.

some discs are recorded with support of only one ratio. The selected radio must comply with the TV screen.

4.Video output: selection of video signal.

Options: S-Video, Comp, RGB

Default option: Comp.

6.Gamma: adjustment of image color temperature.

Options: High, Medium, Low, Off.

Default option: Off.

7.Brightness: adjustment of image brightness.

8.Contrast adjustment of image contrast.

9.Hues: adjustment of image hues.

10.Saturation: adjustment of image saturation. Adjustment of image brightness; contrast, hues and saturation.

Select the desired item of the image adjustment section using the jog Dial. Press OK or RIGHT key to start adjustong the relevant option.

Change the option value using the jog Dial.

Upon completion press the LEFT of the cursor joystick to return to image setup menu.

2.3.4 Sound settings menu

1.Mixer

a) Configuration: setting of the mode for

conversion of the 5-channel signal.

Options: Front F, Center C, Surround Sr,

Subwoofer SW.

Default options: Front F, Subwoofer SW.

If you want the low-frequency component of

the sound signal enter only the subwoofer channel, select and confirm the parameter Subwoofer SW.

e) Channel settings: separate adjusting of

volume by channels.

Select the channel you want.

Adjust the sound volume of each channel using

the wheel.

Press the OK to return to sound settings menu.

f) Delay of the channel: Set-up of signal delay in

speaker channels(central, rear and subwoofer)

Options: Stereo, 5.1.

Default option: Stereo

5.1 mode must be supported by the disc.

Number of music accompaniment channels depends on the specific disc.

Adjustment of the central speaker and

surround speakers is available only if the Configuration option is set to 5.1 position.

b) Stereo mix: playback set-up while playing the

disc with two independent audio channels. Options: L+R, L, R.

Default options: L+R.

# c) Surr.mix: set-up of surround oftions while

playing the sereo disc.

Options: Off, Sum, L+R, Virt, Surr.

# d) Low band: distribution of low frequencies

through channels.

Using the jog Dial, select the channel, for

which you want to set up the delay and press OK for confirmation. Using the jog Dial set up the desired distance

from the listener to each speaker(dectiled description of this operation see on page 32)

g) PRO Logic ll: function of stereo sound

conversion to 5-channel sound.

Options: On, Off, Auto.

Default option: Audio.

In Auto position, the DVD receiver determines

itself, when to use the PRO Logic ll decoder. Some discs do not support this function.

2.Digital audio output.

- 9 -

a) SPDIF format: set-up of digital audio output

options.

Options: RAW, PCM

When you select the RAW option, the not

decoded signal is sransferred to the DVD receivers digital outputs, the decode signal is transferred to analog outputs. Decoding is performed by the built-in decoder of the DVD receiver. This feature is meant to ensure that signal decoding at digital outputs is performed by an external device(e.g.an amplifier)

If you select the PCM option, a PCM coded

signal will be transferred to the DVD receivers digital outputs.

b) LPCM: Set-up of digital audio output options

to comply with different amplifiers and receivers.

Options: 48 kHz 16 bit, 96kHz 24 bit.

Defacelt option: 48kHz 16bit.

3.Sound correction

a) Max volume: max volume limiting. #

Using the jog Dial, adjust the max volume level.

Press the LEFT key of the cursor joystick to

return to sound correction setup menu. b) Equalizer: equalizer modes. #

Options: Rock, Pop, Live, Dance, Techno,

Classic, Soft. #

Default option: Off. c) Echo: echo effects #

Options: Off, Concert, Living room, Hall,

Bathroom, Cave, Arena, Church.

Default option: Off. d) Tone balance: adjustment of tone balance

level.

Adjust the tone balance level using the jog Dial. #

Press the LEFT key of the cursor joystick to return to sound correction setup menu.

2.3.5 Playback settings

1.DVD

Advertisment skip: skip the unskippable block while playing a DVD disc. #

Options: Yes, number

Edfault option: number

If on option is set, while reproducing discs, a

menu will appear, in which you can select the or order of playing the disc content. If the off option is wet, the reproducing of content is performed is the order, in which it is recorded of the disc.

3.Flids” Selection of reproduced files on the disc. Options: Audio, Pictures, Video, All types.

Default option: All types.

4.Repeat: file repeat mode. Options: Off, Single, All

Default option: Off.

5.Load effect: type of transition from one JPEG

file to another.

Options: Off, from top, from bottom.

Default option: Off.

2.3.6 Karaoke settings menu.

1.Microphone: MICROPHONE ON/OFF. Options: On, Off.

Default option: Off.

2.Kar. Help: karaoke-disc playback mode Options: L channel, R Channel, No ast, NO vol.

Default option: No vocal mode.

3.Volume:

Microphone: microphone sound volume level.

Using the jog Dial adjust the microphone

volume level.

Press LEFT key to the cursor joystick to return

to karaoke settings menu.

4.Echo: echo level while playing the karaoke-

disc.

Adjust the echo level Using the jog Dial.

Press LEFT key of the cursor joystick to return

to karaoke settings menu.

2.VCD/SVCD PBS menu: PBC menu on/off

Options: On, Off.

Default option: On.

2.3.7 Preference settings

1.Gr.Equalizer: Spectrum analyzer. Options: On, Off.#

- 10 -

# Default option: Off.

Default option: Off.

2.Background: selection of an image as TV screen wallpaper.

Options: Standard, Saved Default option: Standard.

3.Screen saver: Screen saver on/off.

Options: On, Off.

Default optioon: On.

4.Jog Dial

Options: Zoom, Step, Skip, Volume.

Default: Zoom.

2.3.10 Reset to defaults

Resetting all settings and restoring default options, except age restrictions level and password.

2.3.11 Exit settings menu

Select the item using the jog Dial and press the

OK to exit the menu.

2.3.8 Parental control

1.Category: Setup of age restrictions to prevent children from seeing undesirable discs.

Options: Any, Kid, G, PG, PG-B, PGR, R, NC-

Default option: Any.

2.Set password: Setup of a four-digit password to change the level of age restrictions.

Default option: 7890.#

2.3.9 Initial setup menu

Press the RIGHT key of the cursor joystick to

enter the initial setup menu, then select the desired item using the jog Dial and press OK key for confirmation.

While being in this menu section, you cannot

return to the previous level by pressing the LEFT key of the cursor joystick.

2.3.12 Channel delay set-up

Set-up of tine delay in the surround

channel

Usually, time delay in the Dolby Digital decoding system is preset to ensure best offect while installing the Hone Theater. However, in case y you with to adjust your system more precisely, please consult instructions given in this manual. Set up of time delay for this device is possible in both Dolby Digital and Dolby Pro Logic modes.

Fig.1.Take into account the A-B distance; use both figures for setting the desired time delay.

To set the desired delay you have to know the distance from the place where you are to the front speakers and surround speakers as shown in Fig.1: Consult Fig.2(Dolby Por Logic mode) and 3(Dolby Digital mode) in order to determine the distance to Surround Speakers(axis Y in the figure) and the distance to the front speakers(axis X in the figure). Crossing point of those tow Lines on the chart will give the recommended delay value.

- 11 -

Set-up of time delay in the central

Dolby Digital Dolby Por Logic surround

Rear channel Stereo 20 Hz-20kHz

mone channel with limited frequency range(100Hz-7khz)

Low-frequency channel(subowwfer)

Autilable, 20-120Hz N/a

Sound field distribution

Multivariate From left to right from right to left,

from front to rear, from rear to front

Channels

6 independent channels, each reproducing its own signal at a time

4 segmented channels. Only one channel is decoded at a time.

channel

Sometimes several people are listening to the music, and the space is limited. In this case, you can install three speakers(two front ones and a central one) as shown in Fig.1. With the distance to the listener being approximately the same. The central channel delay is to be set at “0”.

Should the central speaker be in close proximity to left and right front speakers as shown in Fig.2,or the central speakers in one line, as shown on Fig.3 with the delay value of the central to be set at “0”. Finally, if it will be necessary to install the central speaker behind the left and right front speakers, the delay value shall be set at “0”.

“Night” mode

The Dolby Digital system provides an extremely broad dynamic range of playback sound-from gentle to roaring. It creates the presence effect, especially while seeing motion pictures. However, at night a powerful sound with a broad dynamic range may give pleasure to you, but disturb and annoy your family and neighbors.If you just decrease the volume, you will immediately notice that you ceased to hear, e.g., dialogues as clear as you do at normal volume, and such sound effects as rustle, whisper etc have merely disappeared. To avoid this, you just have to decrease the volume of “soft” sounds with the volume of “average” sounds left unchanged, i.e. Just decrease the dynamic range of sound accompaniment. Only Dolby Digital system provides for such a method of sound control. It uses the principle of compressing the acoustic signals dynamic range while recording; there fore; while playing an inverse transformation(volume expansion) takes place. This is called “night” mode. The regulation limits are restricted; however, to avoid distortions of resultant signal.

- 12 -

Creates an optimum sound field with illusion of an equal distance from listener to each speaker

The most cost-efficient way to ensure high-quality surround effect

Allows adjusting the decompression dagree of sound information("night" mode)

Surround sound may be received from any signal source.

Possibility of program mable control of the decoder to transfer basses into lowfrequency channel in systems equipped broad-band speakers and a subwoofer

Compatible with existing and future two-channel(stereo) formats

Undoubted progress in sound recording technology, especially important for program directors, film directors, sound engineers and actors

Big progress in comparison whti conventional stereo, the worol's mosst popular surround format.

Miscellaneous

- 13 -

Chapter Three Principle and Servicing

Section One Principle of the Player

3.1.1 Function introduction

This players adopts new-generation DVD decode chip with built-in Dolby decoder, and the vivid

surround system brings you to taste the living cinema effect. It has the following features:

Progressive scanning output to produce steadier and clearer pictures without flickering

Composite video, S-video and component video output

Digital picture adjustment to sharpness, brightness, contrast, chroma and saturation of pictures,

gamma correction

Built-in Dolby digital decoder

Hi-FI stereo headphone output

FM/AM digital tuning function, capable of storing (memorizing) 20 FM/AM radio stations

respectively

Compatible with DIVX, MPEG4 format movie

3.1.2 Block diagram principle of the player

The player is composed of decode & servo board, power amplifier board, input/output board, panel,

headphone board, tuner, power board and loader. Shown in the figure 3.1.2.1, except that power board

is not shown, other signal flow is basically shown in the figure. The main function of loader is to read disc

information and send to MT1389, MT1389 finishes servo function through D5954 on decode board and

other supplementary circuit, other circuits are used to guarantee the normal working of loader. FLASH

on decode board is to store system program, SDRAM is to store program and information of sound and

picture read from disc when the machine is working and guarantee their normal output. The main

function of power amplifier board is to perform audio DA conversion and amplification of analog signal to

output 5.1CH to guarantee the normal working of external speaker. The main function of AV board is to

output various audio and video signals. This player is attached with headphone and microphone to meet

requirements from customers. In addition, there is external sound input, and you may use the power

amplifier board of this player to perform power amplifying to it to facilitate to output to speaker. The tuner

of this player also makes it have tuning function, and it also equipped with SAA6558 chip, so it may

realize RDS function of Europe and RBDS function of US.

- 14 -

ROUTX

L R

LOUTX

SCART

Video S-video

VIDEO COMP

Optial

VEDIOC VIDEOY

Coaxial

Filtering

Front

Rear

L R

SLOUT

Figure 3.1.2.1 Block diagram of the player

Woofer

SROUT

Center

SW+ SW-

CEN

Front

FROUT

FLOUT

CD4052

N13

TAS5112

- 15 N11

RC4580

N10

RC4580

SCL

SDA SCLK LRCK

N12 TAS5508

SDAT A0 SDATA1 SDATA2

N14

TAS51 12

DAVNIN

XS301

D5954

U201

MT1389

Amplifying circuit N8

N9 TLV272

SDA AD

ADC DAT

CS5340

Y1 Y2 Y3 Y4 Y5 Y6

SPDIF

URST#

Filtering

AUXR

AUXL

TUL

TUR

Amplifying circuit

SAA6558

M 4558

Reset circuit

MIC 1

MIC 2

PDS MPX

External audio input

Tuner

Microphone

HDET

Loader

Headphone

VFD

Screen

CLK STB

SDA

N102

SO793

Button

N103

REMOT

IR receiver

U207

FLASH

U208

SDRAM

Section Two Unit Circuit Principle

3.2.1 Decode circuit

1. Decode circuit block diagram is shown as in the following figure 3.2.1.1:

SDCLK

SDCKE

DCS

DRAS

SWE

SDRAM

DQM0

DQM1

DQ0~DQ15

MA0~MA11

FLASH

PWR

PRD

PCE

A0~A20

AD0~AD7

URST

Reset circuit

MT 1389

SDA SCL

EEPROM

24C02

Figure 3.2.1.1 Decode circuit block diagram

Clock

27M

V18

1.8V

voltage

regulating

U206

2. Working principle: this decode circuit is mainly composed of MT1389, SDRAM and FLASH.

Working condition of decode circuit has:

(1) Reset: refer to reset circuit working principle for details.

(2) Clock: this system adopts 27M external clock input, and produces clock signal required by

system inside through internal frequency doubling circuit.

(3) Power: decode chip adopts twp groups power supply of 3.3V and 1.8V, in which 1.8V mainly

supply power for internal logic control circuit and we call it core voltage.

After power on, reset circuit performs reset to MT1389 built-in CPU (8032) and FLASH, decode chip

outputs reset signal at the same time and performs reset to other circuit. After system reset, it firstly

sends out read signal to FLASH to read out in formation saved in FLASH, the machine displays power-

on picture, servo system begins to work to check whether machine closes door to proper position and

- 16 -

Whether detect switch has been closed, if not, the door close action is performed. After detect switch of

door is closed, the machine begins to perform preparations of disc reading and performs panel display

at the same time of working.

Playback process: laser head picks up disc signal from disc, after servo system processing, then

send to decode circuit for decoding, signal after being decoded is saved in SDRAM for the moment.

When machine needs to replay signal, decode circuit calls information inside SDRAM to perform D/A

conversion and then output.

User information storage: information content set by user is saved inside EEPROM, if user does not

refresh or reset this information, it will saved in IC permanently.

Audio, video output circuit: at present, MT1389 all integrates video D/A converter, MT1389E inside

integrates audio D/A converter, manufactures select according to their own needs. Please refer to

circuit principle diagram and audio circuit explanation for details.

3.2.2 Servo circuit

Servo system of this player adopts SANYO loader MTK decode solution (MT1389E+FLASH

(16M)+SDRAM (6

4M)), and its servo circuit is mainly composed of front stage signal processing and

digital servo processing, digital signal processing IC MT1389E and drive circuit D5954, in which

MT1389E is also the main composition of decode circuit at the same time, shown in the figure 3.2.2.1:

IOA

MD11 LDO2 LDO2

MT1389

XS101

Feed electric machine

Main axis electric machine

Main axis control detect circuit

Switch circuit

APC circuit

A B C D E F RFO

TK-

TK+

FC+

FC-

SL+

SL-

SP-

SP+

D5954

FOSO

FMSO

TRSO

DMSO

Open/close circuit

Figure 3.2.2.1 Servo circuit block diagram

- 17 -

2. Working principle:

After powering on or closing to proper position (on loader frame for general DVD player, on PCB

board of below part of card door for PDVD player), loader lens begins to reset; after laser head is on

proper position, detect switch will give a signal to MT1389, MT1389 begins to output focus, main axis

and light emission signals, disc begins to rotate, laser head begins to recognise disc information, and

judges whether disc is CD or DVD according to disc information to facilitate to output level from IOA pin

to control disc switch circuit and laser head PDIC to make the corresponding control acts. At the same

time, Mt1389 adjusts laser output power through laser power control circuit.

After loader reading disc information, through photoelectric conversion, A, B, C, D, E, F signals are

formed to give to MT1389 (DVD only has A, B, C, D signals), and then inputted from pin 2~11, 18, 19 of

MT1389. After being amplified and processed by the pre-amplifier inside MT1389, now signals are

separated to two part s for processing inside MT1389. After being added amplifying and through

subtraction circuit, one part of signals produce servo error signals and form the corresponding servo

control signal after being processed by digital servo signal circuit and output FOO, TRO, DMO, FMO

servo control signals from pin 42, pin 41, pin 37, pin 38 of MT1389 respectively, through the integration

circuit composed by resistor and capacitor, FOSO, TRSO, DMSO, FMSO signals are sent to servo drive

circuit for amplifying and then brings along fucus coil, trace col, main axis electric machine and feed

electric machine after drive amplifying. Among these, focus and trace servo are used to correct objective

position accurately; feed servo is used to bring along laser head to make radial large-scale move which

belongs to the preliminary adjustment to pick-up position; and main axis servo is used to control main

axis electric machine to make it read signals in means of constant linear velocity and bring along disc to

rotate. After processing of amplification by VGA voltage control amplifier and equalization frequency

compensation inside MT1389, another part of signals are changed into digital signals through internal

A/D converter. When loader is reading CD/VCD signals, these signals are conducted EFM demodulation

inside MT1389, and then outputted to latter stage for AV decoding after finishing CIRC (Cross-

Interleaved Reed-Solomon Code) error correction inside. When loader is reading DVD signals, these

signals are conducted ESM demodulation inside MT1389, and then sent to latter stage for decoding

after finishing RSPC error correction inside. General DVD player has a open/close circuit, which controls

the in/out action of door to reach the purpose of conveying discs. PDVD player adopts manual means to

open the door, and you may judge whether door closes to proper position through detect switch.

3. Explanation to servo terms

(1) FOO: because of the error in disc make, when rotating, disc may probably move upwards or

downwards slightly to make the focus of laser emitted by pick-up cannot justly fall on data pit of disc, so

pick-up is required to move upwards or downwards to make focus aim at data pit justly. The main act is

to make object lens move upwards and downwards.

(2) TRO: data information is saved in disc in form of tracks. When disc is rotating, there will be track

- 18 -

Deviation, now laser head is required to adjust. In this process, the object lens moves forwards or

Backwards, and the moving range is very small.

(3) FMO: similar to acts of trace, the acts of feed are larger than those of trace. Feed conducts a

large scale movement firstly, and then trace moves slightly in this range. Feed moves for a while, and

does not move for another while; but trace moves all the time. Feed is rough adjustment and trace is fine.

The acts are obvious when opening and selecting track.

(4) DMO: it is the performance agency for main axis disc rotation. Its rotation speed decides that of

disc. Its rotation is generated by an individual DC electric machine, in which rotation speed of DVD is

twice over that of CD.

3.2.3 Laser power control circuit

1. Laser power control circuit is shown as in the following figure 3.2.3.1:

LDO-AV33

R301

4.7R TC302

47uF/16V

LDO2

Q301

2SB1132-S

XS301

MD1

Q302

2SB1132-S

20/21

MT1389E

LDO1

TC303 47uF/16V

4.7R

R302

Figure 3.2.3.1 Laser power control circuit diagram

2. Working principle

Pin 20/21 of MT1389 is laser power detect signal input pin, pin 21 is DVD laser power strong/weak

detect signal input pin, pin 23 is VCD laser power drive control output pin, pin 22 is DVD laser power

drive control output pin.

When reading VCD disc, laser power becomes weak, voltage of MDII pin decreases, voltage

LDO-AV33

decrease of pin 23 of MT1389 makes voltage of pin 19 of XS301 increase to reach the purpose of raising

laser power. When laser power is too strong, voltage of MDII pin increases to lead to voltage of pin 23 of

MT1389 increase to make voltage of pin 19 of XS301 decrease to reach the purpose of reducing laser

power to form an auto power control circuit.

- 19 -

Name

When reading

disc normally

When disc out When disc in

When no

disc in

TROPEN 0

There is about 1 second 3.3V

pulse when at the moment of disc

out

0 0

TRCLOSE 0 0V

There is about 1 second 3.3V pulse

when at the moment of disc out

TROUT 3.41V

3.3V 0V 0V 3.3V

3.3V

TRIN 0

0V 3.3V 3.3V 0V

OPO 2.61V 2.75V 2.64V 2.61V

ADIN 2.61V 2.76V 2.61V 2.61V

OP+ 1.66V 1.81V 1.27V 1.81V

OP- 1.85V 2.12V 1.47V 2.04V

When reading DVD disc, pin 21 is detect signal input pin, pin 22 is drive control input pin, and the

working principle is the same with that when playing VCD disc.

3. Key point voltage (unit: V) is shown as the following table:

3.2.4 Main axis control circuit

1. Main axis control circuit is shown as in the following figure 3.2.4.1:

SP-

SPL-

2. Function: disc is always in high speed rotation in the course of disc reading, when you need to

open the door to change disc, MT1389 stops the positive direction drive signal which is given to main

axis drive circuit, for the function of inertia disc is still rotating. If disc out order is performed at this time,

disc will be abrasively damaged. Therefore, machine must be baking to main axis, that whether disc has

stopped rotating and whether disc is reversing, decode chip of the machine cannot recognize. So a main

C307 222

OPO

R320 150K

R317 680K

R318

ADIN

OP-

R321 1R

R319

C308 222

OP+

V1P4

150K

R322 680K

Figure 3.2.4.1 Main axis control circuit diagram

MT1389

axis control circuit is added to make decode chip can effective monitor that whether disc has stopped

rotating.

- 20 -

Key point Position Voltage Remark

DV33 (point A) Diode VD201 cathode 3.3V

TC217 may sends out current from this

point after power failure

Point B Diode VD201 anode

3.3V after reset finishes

After reset finishes, voltage increases from

0V to 3.3V

Point C Pin 5 of reverter 0V after reset finishes

After reset finishes, voltage decreases from

3.3V to 0V

URST# (point D)

Connection place of

R256 and R253

3.3V after reset finishes

After reset finishes, voltage increases from

0V to 3.3V

3. Working principle: MT1389 has a comparator inside composed of operational amplifier, in which

OP+ is the in-phase input end of operational amplifier, OP- is reverse input end, OPO is output end,

when playing disc normally, for electric machine is positive direction rotating, voltage of OP+ is higher

than that of OP-, voltage of OPO is more than 1.4V. When disc out is needed, main axis drive signal

stops, for electric machine is permanent magnetic, when in rotating, induced electromotive force

produces in two ends to give to decode chip through R320, R319 sampling to make OPO output less

than 1.4V voltage and transmit to input pin of MT1389 ADIN through R318. When ADIN is high level,

main axis drive output end has not any drive signal output, when ADIN is low level, MT1389 outputs a

reversing drive signal to main axis drive circuit to make main axis electric machine speed down. Thus

circular working goes on until main axis stops rotating. PDVD is manual disc out means, so after disc out,

disc is still rotating, but will stop very son.

4. Key point voltage (unit: V) is shown as the following table:

3.2.5 Control panel circuit

1. Control panel circuit block diagram is shown in the following figure 3.2.5.1:

FL+

FL-

D+5V

-21V

XS 201

DGND

LED1

LED2

Volume knob

Figure 3.2.5.1 Control panel circuit block diagram

VFD screen

Grid1~Grid8

Seg2~Seg16

S0793

DATA

X S401

- 21 -

STB

CLOCK

Seg2

Seg3

Seg4 Seg5 KEY2 KEY1

Remote control receiver

Button

2. Working principle

(1) Realization of button function: when users are operating machine, button matrix circuit will

produce a button information, and recognise button through S0793 to produce button function code to

transmit to the main CPU inside decode chip, CPU performs the corresponding switch to the function

module inside system, and a signal will produce to control OSD and panel display part to make the

corresponding display.

(2) Panel display drive: when the serial data signals conveyed by decode chip is transmitting to

panel IC (S0793), IC performs VFD drive according to the information conveyed by decode and displays

the corresponding content (controlled by software).

(3) Panel light control light: LED2 controls power switch indicator light, and it is high level after

power on; LED1 controls open/close button indicator light, after power on, low level is outputted to

lighten VD105, square wave signal is outputted when disc out and disc reading, VD105 flashes, it is high

level when playing normally, VD105 turns out.

3.2.6 Power circuit

1. Power circuit block diagram is shown in the following figure 3.2.6.1:

filtering circuit

Electromagnetic interference

filtering circuit

Bridge rectification

Transformer

circuit

Switch module

Absorption loop

Filtering

Start-up

Absorption loop

Filtering

Rectification diode

Feedback loop

Rectification circuit

Transformer

Rectification circuit

Rectification diode

Rectification circuit

220V

circuit

Start-up

Switch module

Rectification diode

Filtering circuit

P+28V

5V voltage regulator

Voltage regulating diode

A+5V

A+12V

D+5V

A-12V

-21V

FL+

FL-

D+3V3

Feedback circuit

Figure 3.2.6.1 Power circuit block diagram

- 22 -

2. Working principle: this power circuit is composed of two parts, which use the common

electromagnetic interference filtering circuit and bridge rectification circuit and filtering circuit. The first

part circuit produces P+28V DC used to supply power for power amplifier circuit; the other part is

responsible for the power supply of other module circuit of the player. The working principle of each

composed part is shown as follows:

(1) Electromagnetic interference filtering circuit: various electromagnetic radiation exists in the

surrounding environment, so it will affect the inputted AC, and the function of electromagnetic

interference filtering circuit is to filter these interference to make those that enter bridge rectification

circuit is pure 220V AC.

(2) Bridge rectification and filtering circuit: the function of this circuit is to produce a 310V DC used

for rear stage.

(3)Start-up circuit: when power on, transformer does not begin to work, now the start-up circuit

provides switch module with a power supply voltage to make it work, after transformer begins to work

normally, the voltage provided for switch module by power supply circuit maintains the working of switch

module.

(4)Absorption loop:the switch module performs on/off action in a high frequency, so a strong self-

inductance voltage will produce in transformer primary coil and switch module will probably be damaged.

The function of absorption loop is to form a loop for this self inductance to ensure the normal working of

circuit.

(5) Switch module: that inputted from transformer is 310V DC. To make transformer work, AC shape

voltage must be presented. The function of switch module is to control this 310V DC to make it on for a

while and then off for a while to produce a high/low voltage change in the primary stage of transformer,

thus the transformer can work.

(6) Power supply circuit: provides a power supply voltage for switch module.

(7) Rectification diode: the voltage that outputs from transformer is pulse DC, the function of

rectification diode is to change pulse DC to DC together with the filtering circuit behind.

(8) Feedback loop: the time of “on” and “Off” in the same cycle inside switch module 5L0380R is

decided by feedback loop. Feedback loop perform sampling to +3.3V output voltage, when output

voltage is too high, through feedback loop, the space occupation ratio of pin 4 signal of 5L0380R is

changed, the “on” time decreases, and output voltage begins to decrease. When output voltage is too

low, the voltage sampled is on low side, through feedback loop, space occupation ratio of 5L0380R

increases, output voltage increases to make power board output stable voltage through the function of

feedback loop. LM431 used in this power is a 2.5V comparator, compare sampling voltage with this 2.5V

voltage, when sampling voltage is more than 2.5V (means output voltage is on high side), LM431 is on,

light emission diode in photoelectric coupler begins to emit light to make the other end of photoelectric

coupler begin to be on, the light emission is stronger, the “on” degree is large, the “on” time of switch

module 5L0380R decreases, output voltage begins to decrease. When sampling voltage is less than

- 23 -

2.5V (means output voltage is on low side), LM431 cuts off, the “on” time of VEPR22 increases, output

voltage increases, thus power board outputs stable voltage through the auto control function of

feedback loop.

(9) Filtering circuit: the function is to produce a stable and small-ripple DC voltage. “ “-style filter is

often adopted in filtering circuit. The features of capacitor filtering are: when load resistance is high and

current is small, filtering function is obvious; for inductor filtering, when load resistance is small and

current is large, filtering function is obvious. Constitute capacitor to “ “-type filter, it may have better

filtering effect.

3. Main functions of various voltage outputted by power board:

(1) -21V: supply power for panel main chip N102.

(2) FL+¡¢FL-: supply power for filament of panel display screen.

(3) D+5V: supply power for N102, servo drive chip U302 (D5954) and open/close circuit.

(4) P+28V: supply power for audio power amplifying chip N13, N14 (TAS5112).

(5) A-12V, +12V: supply power for audio power amplifying chip N1 (F4558), N10 (RC4580), N11

(RC4580) on power amplifier board. A+12V: supply power for tuning data processing chip N6 (SAA6558)

and tuner.

(6) D+3V3: supply power for U201 (MT1389), U214 (FLASH), U211 (SDRAM) and U205 (74HCU04).

(7) A+5V (pin 5 of XP203): supply power for loader.

(8) A+5V (pin 1, 2 of XS504): supply power for power amplifier board ADC chip N7 (CS5340), and

digital audio pulse modulating chip N12 (TAS5508).

(9) A+5V (pin 4 of XS504): supply power for power amplifier board data selection chip N5 (CD4052),

and audio power amplifying chip N8, N9 (TLV272).

3.2.7 Audio power amplifying circuit

1. Audio power amplifying circuit block diagram is shown in the following figure 3.2.7.1:

External audio input

MIC signal input

External audio input

Decode board

AU R

AU L

CD4052

TUL

TUR

SDATAO,ADATA1,ADATA2

AINR

AINL

CS5340

SDA

74HCT125

SDA AD

N12

TAS5508PAG

N13

TAS5112

N14

TAS5112

TLV272

4580

N10

Surround left/right channel, subwoofer channel output on power amplifier board

Front left/right channel, centre channel output on power amplifier board

Left channel LD

AV board left/right channel output

Right channel RO

H-R

N11

H-L

4580

Headphone output

Figure 3.2.7.1 Audio power amplifying circuit block diagram

- 24 -

2. Working principle: the system switches DVD signal and external input signal through the control

of N3, N4 by

M0, M1. When M0, M1 is 0, 1, through the selection of DVD signal bu system, N3B, N3C,

N3D, N4A, N4B, N4C of tri state gate buffer open, N3A and N4D close, 1389 sends the digital audio

signals SDA_LR, SDA_SLSR, SDA_SCW, SCLK, LRCK to 5508 directly for formatting, and the system

clock MCLK of power amplifier board is provided by 1389 through pin 6 of XP207, after being converted

by CS5340 AD , MIC signals are directly sent inside 1389 for processing, and overlapped to left/right

channel to output together after processing; when M0, M1 is 1, 0, through the selection of external input

signal (radio set and external audio input) by the system, N3B, N3C, N3D, N4A, N4B, N4C, N3A of tri

state gate buffer close, N4D opens, after being converted by CS5340 AD , external audio signals are

connected to SCLK, LRCK, SDA_AD and sent to 5508 for format conversion, and the system clock

MCLK of power amplifier board is generated by external crystal oscillation Y3.

N5 (CD4052): CD4052 is a select switch, which selects is the three-path signals of external input

tuning signal, MIC signal and left/right channel audio signal. When the player is selecting the state of

playing disc, MIC signal can be gated. Through CS5340, MIC signal converts to digital signal, which

inputs to decode board for processing and then output from pin 217 (ASDATO) of Mt1389 to power

amplifier board. Note: the MIC signal through CS5340 does not pass through N4 (74HCT125).

N7 (CS5340): convert the analog signal sent out from CD4052 into digital signal for processing in

rear stage circuit.

N3, N4 (74HCT125): 74HCT125 is a gating IC with 4-channel in it, which can select the 4-path

signals. N3 carries out the gating for the 4-path signals of clock signal MCLK, audio signal SDATA0,

SDATA1, SDATA2.

N12 (TAS5508): after performing pulse width modulating processing to the 4-path digital audio

signals of SDA, SDATA0, SDATA1, SDATA2, 10-channel output produces: left/right channel output on

input/output board, headphone left/right channel output, front left/right channel output on power

amplifier board, surround left/right channel output, subwoofer channel and centre channel output.

N13, N14 (TAS5112): it is a high-performance amplifying IC, which modulates and amplifies the

front left/right channel, surround left/right channel, centre and subwoofer after being PWM modulated by

N12 (TAS5508).

- 25 -

3.2.8 Output circuit

1. Power amplifier surround left and right channel block diagram is shown in the following figure

3.2.8.1:

Disc

Loader

XC100

MT1389

218

ASDAT1

SROUT

SLOUT

46 47

50 51

TAS5112

R295

N13

SDATA1

XS207

PWMSR+

PWMSR-

PWMSL+

PWMSL-

R56

N12

TAS5508

6DASLSR

N3 74HCT125

Figure 3.2.8.1 Power amplifier surround left and right channel block diagram

2. Power amplifier left/right channel output and non power amplifier left/right channel output block

diagram are shown in the following figure 3.2.8.2:

MIC signal

Tuning signal

Left/right channel input

MIC1

MIC2

AU R

AU L

XS402

XP204

XP401

XS201

XS401

4558

TUR

TUL

AU R

AU L

(CD4052)

R100

SDALR

N3 74NCT125

SDAAD

R99

R101

TAS5508

R29

N4 74HCT125

PWMFL-

PWMFL+

PWMFR-

PWMFR+

PWMRL-

PWMRL+

PWMRR-

PWMRR+

XS207

N14

(TAS5112)

N18

(TLV272)

N19

(TLV272)

SDATA0

R225

40 41

FROUT

FLOUT

TLV272

R294

N18

N19

ASDAT0

217

MT1389

TUR TUL AU R AU L

XC100

XS401

XP401

Figure 3.2.8.2 Power amplifier L/R channel output and non power amplifier L/R channel output block diagram

224

Power amplifier left/right channel output

L100

L102

- 26 -

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