BBK DV727SI User manual

service manual
DV727SI

Catalog
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 Control Button Locations and Explanations
2.2.1 Front Panel Illustration
2.2.2 Rear Panel Illustration
2.2.3 LED Display Window Illustration
2.2.4 Remote Control Illustration
2.3 Accessories
2.4 FUNCTION SETUP
2.4.1 Function Setup
2.4.2 Language
2.4.3 Image
2.4.4 Sound
2.4.5 Playback
Chapter One About Maintenance
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2.4.6 Karaoke
2.4.7 Preference
2.4.8 Parental control
2.4.9 Initial setup
2.4.10 Rest to defaults
2.4.11 Exit
2.5 Specifications
Chapter Three Principle and Servicing
Section One Principle of the Player
3.1.1 Function and features
3.1.2 Block diagram of the player
3.1.3 Introduction to IC used by this player
Section Two Unit Circuit Principle
3.2.1 Servo circuit
3.2.2 Audio/video output circuit
3.2.3 Mute circuit and power-off quieting circuit
3.2.4 Reset circuit
3.2.5 Power supply circuit
Section Three Servicing Cases
3.3.1 Servicing cases
3.3.2 Troubleshooting flow chart
Section Four Waveform diagram
Section Five Function Introduction to IC
3.5.1 function introduction to MT1389HD
3.5.2 function introduction to AT24C02
3.5.3 function introduction to CS5340
3.5.4 function introduction to 74HCU04
3.5.5 function introduction to FLASH
3.5.6 function introduction to SDRAM
3.5.7 function introduction to 4580
3.5.8 function introduction to D5954
3.5.9 function introduction to Pt6961
3.5.10 function introduction to VIPer22ADIP
3.5.11 function introduction to Ph817
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3.5.12 function introduction to LM431A
3.5.13 function introduction to 4558
3.5.14 function introduction to TDA1308
Chapter Four Disassembly and Assembly Process
Chapter Cinque PCB board & Circuit diagram
Section One PCB board
Section Two circuit diagram
Chapter six BOM List
3.5.14 function introduction to MT1392E
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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.
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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.
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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
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Chapter Two
Functions and Operation Instructions
2.1 Features
This player has employed the new generation DV decode chip with built-in Dolby Digital decoder
which will bring you to a brand-new AV entertainment world. The 2-laser super error-correction
mechanism supports CD-R.
Brand-new AVEffects
#Compatible with DivX, MPEG4 discs to produce wonderful pictures.
#108MHz/12bit video DAC, with more vivid and brilliant pictures.
#Progressive-scan video outputs to eliminate the flickers hardly overcome by interlacing scan and
therefore your eyesight will be well-protected. At the same time, the pictures definition Is sharply
enhanced and the pictures will be finer, smoother and stabler
#Brightness, chroma and contrast adjustment functions to render your eyes more comfortable.
#Digital echo Karaoke to enable your singing easier.
#Composite Video, S-Video and Component Video outputs.
#Bullt-In Dolby Digital decoder, separate 5.1Ch Outputs.
#Dolby output for 2channel(DOWNMIX)
#DVD-Audio decoding output to reproduce original and realistic sound effects.
#Smoothly read SACD.
High Quality Digital Audio
#Optical and coaxial outputs for Digital audio.
#DTS, Dobly Digital, PCM Digital audio outputs to satisfy the Fans’S acoustic requirements.
Many Convenient Features
#Screen saver protects your TV set carefully.
#The novel Mp3 playback window GUI provides you a new way to appreciate Mp3 music.
#Multi-angle playback function makes it possible for you to view a scene from different camera angles.
#It’s possible to select the desired beginning, development and ending of a story.
#Direct entry into desired scenes(title/chapter/track search).
#Zooming function to zoom up any playing picture.
#Capable of playing PAL/NTSC discs.
#Multiple aspect ratios to fit TV sets of various screen ratios.
#Parental lock function to prevent children from watching unsuitable discs.
#Multiple dubbing languages and subtitle languages bring you the best entertainment status all the time.
Super Compatibility with super VCD, VCD, CD , CD-R , MP3,HDCD, KODAK PICTURE CD etc.
NOTE: DivX version is still upgrading continuously and the latest version of this unit is DivX 5.1.
Some discs labelled with MPEG4 on the market actually are others, with which are incompatible .
Please take care when buying discs.
#Compatible with USB equipment, capable of reading the audio/video data in the USB through USB
port.
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2.2 Control Button Locations and Explanations
2.2.1 Front Panel Illustration
Headphone Jack
MIC Jack
POWER switch
IR SENSOR
Display window
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5
Power indicator
Disc tray
OPEN/CLOSE button
PLAY button
STOP button
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Push button
PREV button
PAUSE button
NEXT button
Slot flap for USB
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4237
5689
2.2.2 Rear Panel Illustration
HDMI Out jack
Mixed Audio out jack
5.1CH Audio Out jack
Video Out jack
S-Video
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2
3
4
5
Video Component /Y Pb Pr out jacks
Digital Audio Coaxial Out jack
Digital Audio Optical Out jack
SCART out jack
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2.2.3 LED Display Window Illustration
647
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23
Play
Playback time
DVD disc
Pause
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CD disc
Mp3 disc
VCD disc
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2.2.4 Remote Control Illustration
Button
Open or close the disc tray.
LANG Button
Change the audio language or audio channel.
MEMORY Button
Save the playing point or jump to the saved point .
DISP Button
Display or hide disc information.
NUMBER Buttons
BROWSE Buttons
switch new user interface.
CURSOR Buttons
SETUP Button
Function Setup.
Button
Open/close the virtual keyboard function.
KARAOKE Button
Karaoke operation menu.
Button
Fast backward play.
Button
Skip backward.
PEPEAT Button
Repeat play.
A-B Button
Repeat the select.
Button
Press once to stand by, Press twice to play.
SUBT Button
Change subtitle language, Switch JPEG display mode.
HDMI Button
Switch output mode of HDMI.
Q-PLAY Button
Skip the advertisement/warning and play the DVD
directly.
MENU Button
Display DVD menu or open/close PBC.
OK Button
Cancel Button
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ZOOM Button
Zoom in/out the displayed frame.
Button
Play or pause playback.
Button
Fast backward play.
Button
Stop playback.
Button
Skip forward.
USB DVD Button
VOL +/- Button
Increase/decrease volume level.
MUTE Button
Press once to mute, twice to unmate.
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2.3 Accessories
AUDIO/VIDEO CORD
REMOTE
AAA SITE BUTTERIES
WARRANTY CARD
USER MANUAL
KARAOKE DISC
1PCS
1PCS
2PCS
1PCS
1PCS
1PCS
Setup menu
DVD menu
Soundtrack
Subtitle Off
Language
Image
Sound
Playback
Karaoke
Preference
Parental control
Initial setup
Reset to defaults
Exit
Setup menu
DVD menu
Soundtrack
Sbutitles Off
Russian
English
Ukrainian
High
Medium
Low
TV system
TV scan mode
Video out.
TV format
Sharpness
Gamma
Brightness
Contrast
Hue
Saturation
AUTO
IS
S-Vid.
LB
L.
Off
0
0
0
0
TV system
TV scan mode
Video out.
TV format
Sharpness
Gamma
Brightness
Contrast
Hue
Saturation
AUTO
IS
S-Vid.
LB
L.
Off
0
0
0
0
AUTO
PAL
NTSC
2.4 FUNCTION SETUP
2.4.1 Function Setup
1.Press the [SETUP] button and the screen
displays the selection menu of function setup.
2.Press the [CURSOR] button to select the menu
to be entered and press the [OK] or button to
confirm. Or press the [CURSOR] button to
Exit item and then press the [OK] button to exit .
3.Press [UP/DOWN] arrow to select the desired
item you want to set and press [OK].
For example, press [UP/DOWN] arrows to
select IMAGE and press [OK]. The Image setting
page appears on the screen.
4.Press [UP/DOWN] arrow to select the
SHARPNESS item. Press [OK] to confirm it.
And then press [UP/DOWN] arrow to select
the desired valus.For example: Press[ UP/
DOWN] arrow to select “Medium” ,then press
[OK], the TV screen display.
5.Press [LEFT] button if you want to return to the
previous setup page.
6.Press [SETUP ]to exit the setup menu.
2.4.2 Language
1.Setup menu: This item is used to set the
prompts language on the screen.
#Optional setting: Russian, English, Ukrainian.
#Default: English.
2.DVD menu: To set the preference discmenu
lang when playing.
#Optional setting:
#Default: English.
3.Sountrack:To set the preference audio
language when playing.
#Optional setting:
#Default: English.
4.Subtitles: To set the preference subtitle
language when playing.
#Optional setting: Off,
#Default: Off.
2.4.3 Image
Russian, English, Estonian,
Latvian, Kazakh, Romanian, Byelorussian,
Ukrainian, Chinese, Others.
Russian, English, Estonian,
Latvian, Kazakh, Romanian, Byelorussian,
Ukrainian, Chinese, Others.
Russian, English,Estonian,
Latvian, Kazakh, Romanian, Byelorussian,
Ukrainian, Chinese, Others.
TV system
TV scan mode
Video out.
TV format
Sharpness
Gamma
Brightness
Contrast
Hue
Saturation
AUTO
IS
S-Vid.
LB
L.
Off
0
0
0
0
AUTO
PAL
NTSC
1.TV system: This item is used to the video
output system of this unit.
#Optional setting: Auto, PAL, NTSC.
#Default: AUTO.
2.TV scan mode: To set
.
3.Video output: To set the types of SCARTout
connector.
Progressive scan,
Interlaced scan mode
#Optional settings: Progressive , Interlaced .
#Default: Interlaced.
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Mixer...
Digital output
Tuning
HDMI Audio On
Configuration
Stereo mix
Surr. Mix
Low band
Channels
Delays
PRO Logic II
St.
L+R
sum
FSW
Off
Stereo
5.1
Configuration
Stereo mix
Surr. Mix
Low band
Channels
Delays
PRO Logic II
St.
L+R
sum
FSW.
Off
#Optional setting: S-Video,Component , SCART.
#Default: Component.
#When using RGB outputs from the SCART
interface,please select RGB. Other wise ,
please select Com-ponent,and when using S-
Video output please select S-Video.
4.TV format: To set the aspect ratio of this
player’s output image.
#Optional setting: 4:3 Pan-scan, 16:9 letterb.,
16:9 TV,16:9 Wideo/SQZ.
#Default: 16:9 TV.
5.Sharpness:Used to set the sharpness of video
outputs.
#Optional setting: High, Medium, Low.
#Default: Medium.
#Optional setting: High, Medium, Low, Off.
#Default: Off.
7.Brightness:Used to set the brightness of video
outputs.
8.Contrast:Used to set the contrast of video
outputs.
9.Hue: Used to set the hue of video outputs.
10.
A.
B.
2.4.4 Sound
6.Gamma emendation:This item is used to setup
the Gamma value of video output.
Saturation: Used to set the saturation of video
outputs.
#Brightness, contrast, hue and saturation
adjusting means:
Press [UP/DOWN] arrow in the video setup
menu to select the desired item you want to
adjust. Press [OK] or [RIGHT] button to enter
the item's adju-stment.
Press [UP/DOWN] arrow to adjust the setting
value.
1.Mixer...
#Optional setting: Stereo, 5.1.
#Default: Stereo.
B.Stereo mix: To set the output means of the
left or right audio when playing a Dolby disc
with separate two-channel audio.
#Optional setting: L+R, L, R.
#Default: L+R.
C.Surr. Mix: To set output means of the surround
left and right audio when playing a stereo disc.
#Optional setting: Off, sum, Virt.Surr.
#Default: Off.
D.Low band: select the channel that you desire
to output low frequency signal.
#Optional setting: Front F, Center C, Surround Sr,
Subwoofer SW.
#Default: Front F, Subwoofer SW.
E.Channels: To set volume of each individual
channel.
a.Press [UP/DOWN] navigation keys to select
CHANNEL TRIM, then press the [OK] or
[RIGHT] navigation key to select ENTER
SETUP PAGE as shown in the TV screen:
16
Volume L
FRONT surround
Rl r Center SW
16 16 16 16 16 16
Subwoofer
Center
LS/RS
0cm
0cm
180cm
b. Press [LEFT/RIGHT] navigation keys to select
the desired channel to adjust.
c. Press [UP/DOWN] navigation keys to raise or
lower volume of the channel.
d. Press [OK] or [LEFT] to return to the Mix.
setup page.
F. Delays: To set delay time of the Center/
Surround/ Subwoofer Speaker.
a. Press [UP/DOWN] navigation keys to select
Delays in Channels item, then press [OK] or
[RIGHT] navigation key select ENTER SETUP
PAGE as shown in the TV screen.
A.Configuration: To set this player’s DOWNMIX
mode to change multi-channel audio into two
channel audio.
b.Press [UP/DOWN] navigation keys to Select
the desired item oup Press [OK] or [RIGHT]
button to enter setting.
c.Press [UP/DOWN] navigation keys to raise or
lower volume.
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d. Press [OK] or [LEFT] to return to the Delays in
channels setting page.
#Optional setting: AUTO, On, Off .
#Default: AUTO.
2. Digital output: select to set the format and
stream form of digital audio output.
A. SPDIF format:
#Optional setting: RAW format, SPDIF/PCM.
#Default: RAW format.
B. LPCM
#Optional setting: 48 kHz 16 bit, 96 KHz 24 bit.
192kHz 24bit.
#Default: 48 kHz 16 bit.
3. Tuning:
A. Max volume: set the maximum volume.
B.Equalizer: To set Equalizer modes.
#Optional setting: Off, Rock, Pop, Live, Dance,
Techno, Classic, Soft.
#Default: Off.
C. Echo: To set different sound field effects.
#Optional setting: Off, Concert, Living room, Hall,
Bathroom, Cave, Arena, Church.
#Default: Off.
D.Tone balance
#Optional settings: On, Off.
#Default: On.
2.4.5 Playback
G. PRO Logic II: To set PRO Logic II to ON or
OFF. If the TITLE does not support this
function, we recommend that you set this item
to AUTO because it would become worse if the
processing effects were added forcibly.
: to set the tone level to match
your diapason when you're singing
#Method to adjust tone control:
a. Press [UP/ DOWN] cursor buttons to select
"tone" item in Audio Setting page, and then
press [OK] or [RIGHT] button to enter
Adjustment Menu.
b. Press [UP/DOWN] cursor button to adjust
setting value.
c. Press [OK] or [LEFT] button to return to Audio
Setting page after adjustments are done.
4.HDMI Audio: This item is to set whether the
HDMI Audio output is allowed.
DVD
VCD/SVCD
Files
SACD Priority
Repeat
Load effect
Advertisemenu No
A. P. V
MCH
Off
Off
1. DVD:set whether information of advertisement
and warnings at the beginning of DVD disc is
skipped to play the movie directly.
Always skip ads
#Optional setting: Yes, NO
#Default: Number
2.VCD/SVCD: To set the PCB status.
#When playing Super VCD or VCD2.0 discs, if
the PCB is ON, the menu image displays.
#Optional setting: On, Off.
#Default: On.
SACD Priority: Set SACD Mode
#Optional settings: Multi-Channel, 2-Channel,
CD Mode.
#Default: Multi-Channel.
NOTE: This setup item is valid only when
no disc in or disc tray opens.
4.Files:data disc may probably includes Mp3,
JPEG and MPEG4 format files in which you
may select DVD player to read the file type.
#Optional setting: Audio, Picture, Video.
#Default: Audio, Picture, Video.
5. Repeat : select the repeat playback mode.
#Optional setting: Off, Single, all.
#Default: Off.
6. Load effect: set the may to play JPEG image.
#Optional setting: Off, from top, from bottom.
#Default: Off.
2.4.6 Karaoke
3.
Microphone
Kar. help
Volume
Echo
On
Off
On
No ast.
5
5
1.Microphone: switch on or off microphone.
#Optional setting: On, Off.
#Default: Off.
2.Kar. help: select accompany singing means.
#Optional setting: Channels L, Channels R,
Channels No ast, Channels No voc.
#Default: Channels No ast.
3.Volume:
A.In microphone setup page, press [UP/DOWN]
cursor to select “Volume” item, and then press
[OK] button to enter the adjustment menu.
B.Press [UP/DOWN] cursor to adjust the setup
value.
C.After adjustment finishes, press [OK] button
to return to microphone setup page.
Microphone
Kar. help
Volume
Echo
On
No ast
4
4
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Microphone
Kar. help
Volume
Echo
On
No ast.
4
LED Control
Gr. equalizer
Screen saver
On
Off
Off
On
4.Echo:
A.In microphone setup page, press [UP/DOWN]
cursor to select “Echo” item, and then press
[OK] button to enter the adjustment menu.
B.Press [UP/DOWN] cursor to adjust the setup
value.
C.After the adjustment finishes, press [OK]
button to return to microphone setup page.
2.4.7 Preference
Auto
PAL
NTSC
any
Kid
G
PG
PG-13
PGR
R
NC-17
Allowed..
Set password
Any
Old password
New password
Verify
OK Cancel
Load factory settings
OK Cancel
Language
Image
Sound
Playback
Karaoke
Preference
Parental control
Initial setup
Reset to defaults
Exit
1.LED Control:This item is used set color of led
on the front panel.
#Optional setting: On, Off.
#Default: On.
2.Gr. equalizer: This item is used to set wether
the Dynamic Spectrum is allowed.
#Optional setting: On, Off.
#Default: Off.
#Dynamic Spectrum display is invalid in Data
disc DVD AUDIO playback.
3.Screen saver: Open or close the screen saver
function.
#Optional setting: On, Off.
#Default: On.
2.4.8 Parental control
1.Allowed..: To set the parental control ratings to
prevent children from watching the restricted
contents.( In case the disc supports this
function.)
#Optional setting: any, Kid, G, PG, PG-13, PGR,
R ,NC-17.
#Default: any.
2.4.9 Initial setup
Press [UP/DOWN] arrow to select the
desired option and Press [OK] button to confirm
it.
NOTE
2.4.10 Rest to defaults
In this setup state, you may not press [LEFT]
button to return to the previous menu.
Reset to defaults: To restore all settings to
the default value except for the parental control
and password settings.
2.4.11 Exit
Press [UP/DOWN] arrow to select the Exit
item. Press [OK] button to exit the setup menu.
2. Set password: To set four digit password to
enable you to change the parental control
ratings.
#Default: 7890.
2.5 Specifications
Playerable discs DVD-Video, Super VCD, VCD, DivX 3.11, DivX 4,DivX 5, Divx Pro, XviD, CD-DA,
CD+G, DVD-Audio,HDCD, MP3, WMA, Kodak Picture CD, JPEG,SACD
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Inputs
Audio outputs
Video outputs
Video Characteristics
Audio characteristions
Operating voltage
Power consumption
General Specifications
Operating Temperature
Operating Humidity
Composite, S-Video, component Y Cb Cr, progressive scan
output Y Pb Pr, RGB/SCART
Headphones output
Outputs
15~75%(no condensation)
MIC input,USB
Video amplitude 1.0Vp-p(75 )
S-Video amplitude Y:1.0Vp-p(75 ) C:0.286Vp-p(75 )
Component Video amplitude Y:1.0Vp-p(75 )
Cb/Cr:0.7Vp-p(75 )
Frequency response 20~20KHz(±1 dB)
Slgnal-to-noise ratio >100(dB)
THD <0.01%
Dimensions: 420mm 236.5mm 39mm
Mass: 2.3kg
~110V-250V, 50/60 Hz
14W
5~35
Analog audio output: Stereo, output 5.1CH
Digital audio output: Coaxial,Opcical
#Design and specifications are subject to change without notice.
#We do not guarantee that all discs can be played smoothly due to the disc quality, disc recording quality
and recording format.
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3.1.1 Functionandfeatures
This model adopts new generation DVD decode chip, with built-in Dolby decoder and realistic
surround system, which brings you vivid and real movie effect. It has the following features:
Progressive scanning output to produce steadier and clearer pictures without flickering.
5.1CH output.
Composite video, S-video, component video output..
Digital picture adjustment to the sharpness, brightness, contrast, chroma and saturation of
pictures, gamma correction.
Built-in Dolby digital decoder.
Karaoke function.
Hi-Fi stereo headphone output.
Compatible with DIVX, MPEG4 format disc.
3.1.2 Block diagram of the player
Its internal structure is mainly composed of decode & servo board, power amplifier board,
input/otuput board, panel, headphone board, tuner, power board and loader. The principle block diagram
is shown as the figure 3.1.2.1. All other signal flow is shown in figure except power board. The function
of loader is to read disc information and transmit it to MT1389, which performs servo function through
D5954 on decode board and other supplementary circuit, and ensues the normal working of loader.
FLASH on decode board is to store system program, SDRAM is the saved software and sound/picture
information read from disc to ensure its smooth output. Main function of AV board is to output various
video signals. This player is also with headphone and microphone, which can meet the demands of
customers.
Chapter Three Principle and Servicing
Section One Principle of the Player
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Power
board
ACIN
+9V
-9V
DV33
AVCC U216 V18
M
M
M
Feed
electric
machine
Main axis
electric
machine
VIP4
Reset
27M clock EEPROM
24C02
U202
Mt1389 B
U201
D5954
U301 FOSO
FMSO
DMSO
TRSO
FC-
FC+
TK+
TK-
SL+
SL-
SP+
SP-
Open/close
door control
circuit
UREST
SCL
SDA
XI XO
DVD:A/B/C/D/RFO
CD:A/B/C/D/E/FRFO
MDI
LD02
LD01
Laser power
control
CD/DVD switch
IOA
PICK-UP
VR-DVD
VD-CD
LD-DVD
LD-CD
Panel SDRAM 64M
FLASH16M
U208 U207
MIC board
MIC
CS4340
Audio
amplifying
filtering
Video
filtering
clamping
AV
output
terminal
U209
U210
U211
AL
AR
ALS
ARS
SW
CTR
L
R
LS
RS
SW
C
CVBS
Y/G
CB/B
CR/R
ASPDIF
SY
SC
CVBS
B/U
R/V
G/Y
Y1
Y2
Y0
Y3
Y4
Y5
Y6
Y7
SLRCK
SBCLK
SACLK
SDATA0
SDATA1
SDATA2
SDATA3
ASPDIF
SCL
SDA
INT0#
PWDN#
MT 1392
DVI jack
HDMI jack
ROUT#
GOUT#
BOUT#
TX 0-
TX 2+
TX 1-
TX 2-
TX 0+
TX 1+
TXC-
TXC+
HPD
HSYNC#
VSYNC#
HDMI SCL#
HDMI SDA#
HPD
Figure 3.1.2.1 Block diagram of the player
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PCBsemi-finished
product name IC model Location Function
MT1389B U201 Decode chip
24C02 U202 EEPROM
MT1392C U203 HDMI control
HCU04 U205 Phase inverter
RT9701 U206
CS4360 U207 AD conver sion
LM1117 U209 Precision voltage stabilizer
FLA SH U207 16M FLASH
SDRA M U211 64M SDRAM
4580 U219, U220, U221 Operational amplifier (audio amplifying)
D5954 U302 Servo driv e
PT6961 U401 Panel control IC
HS0038B3V U402 Remote control rec eiver
V IPER2 2 U501 Power sw itch IC
PH817 U502 Photoelectric coupler
LM431A U503 Precision voltage stabilizer
4558 U601 Operational amplifier (audio amplifying)
TDA1308 U603 Operational amplifier (headphone audio amplifying)
MIC board
Main panel
Power board
Decode board
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3.1.3 Introduction to IC used in this player
Introduction to IC used in DV727SI is shown in the following table:

Section Two Unit Circuit Principle
3.2.1 Servo circuit
1. DV727SI adopts SANYO 62 decoder and MTK decode solution (MT1389+FLASH(16M)+SDRAM
(64M)). The servo circuit is mainly composed of front signal processing, digital servo processing, signal
processing IC T1389 and drive circuit D5954, in which MT1389 is the main component of decode circuit
at the same time.
Figure 3.2.2.1 Servocircuit diagram
Loader
DVD laser powercontrol
VCD laser powercontrol
Disc identification circuit
Disc in/out electric
machine and
detecting switch
Disc in/out circuit
Feed electric
machine on loader
Main axis
braking circuit
Main axis electric
machine on loader
Integration circuit
Integration circuit
Integration circuit
Integration circuit
- 15 -

2. Working principle: after powering on or disc in, according to IOA signal, disc identification circuit
decides through which path of variable resistor the laser detecting diode gets path to the ground,
meanwhile MT1389 decides whether DVD laser or VCD laser is emitted according to IOA signal, which
can be fulfilled through laser power control circuit. When IOA is high level (3.3V), Mt1389 pulls LOD1 of
V302 base electrode in laser tube power control connected to VCD down to about 2.2V to make V302 on
and to make VCD laser tube emit beam; then decides whether to pull up or pull down LOD1 according to
voltage after the feedback from MDI1 to control the power of light emission diode. Similarly, when IOA is
low level (0V), MT1389 pulls LOD2 of V301 base electrode in laser tube power control connected to
DVD down to about 2.2V to make V301 on and to make DVD laser tube emit beam; then decides
whether to pull up or down LOD2 according to the voltage after the feedback from MDI
After loader reading disc information, A, B, C, D, E, F signals are sent out 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 processed by digital servo signal circuit inside MT1389, one part of signal form
corresponding servo control signals and output FOO, TRO, DMO, FMO digital servo control signals from
pin 42, pin 41, pin 37, pin 38 of Mt1389 respectively, then change into analog servo control signal FOSO,
TRSO, DMSO, FMSO through integration circuit composed by resistor capacitor, and send to driver
circuit BA5954 for amplification to bring along focus coil, trace coil, main axis electric machine and feed
electric machine after drive amplification. 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 readingDVD signals,
these signals are conducted ESM demodulation inside MT1389, and then sent to latter stage for
decoding after finishing RSPC error correction inside.
The other part of servo is open/close disc tray circuit. After panel or remote controller emits
open/close disc tray signal toMT1389, in usual conditions, TROPEN and TRCLOSE sent out by pin 39,
51 of Mt1389 are both low level, when signal of “open” comes, after Mt1389 makes disc stop rotating
through main axis braking circuit, TRCLOSE is set high to make open/close electric machine on loader
frame run to bring along dist tray to eject. After disc tray ejecting to proper Signal of opening to proper
position (TR_OUT) is set high level (0V) through the detecting switch on loader frame, MT1389 pulls
down TRCLOSE and open/close electric machine stop running. When MT1389 receiving “close” signal,
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