BBK V3H, V5N, V5H Schematic

V3N V3H

V5N V5H

service manual

Catalog

Chapter One About Maintenance

1.1 Safety precautions

1.1.1 Precautions for antistatic

1.1.2 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 QUICK OPERATION

2.1.1 BUTTONS AND JACKS ILLUSTRATION

2.1.2 POWER ON/OFF

2.1.3 PLAY MUSIC

2.1.4 VIDEO

2.1.5 PICTURE BROWSING

2.1.6 E-BOOK BROWSING

2.1.7 RECORDING

2.1.8 TUNING

2.1.9 RESUME PLAYING

2.1.10 CALENDAR

2.1.11 CHARGE

2.1.12 RESET

2.2 USAGE INTRODUCTION

2.2.1 MAIN MENU ILLUSTRATION

2.2.2 PLAYING INTERFACE

2.2.3 RECORDING INTERFACE

2.2.4 TUNING INTERFACE

2.3 BASIC OPERATION

2.3.1 USE MOBILE STORAGE FUNCTION

2.3.2 DISCONNECT USB SAFELY

2.3.3 VIDEO CONVERSION TOOL

2.3.4 BROWSE/CANCEL FILE

2.3.5 PLAY MUSIC

2.3.6 A-B REPEAT FUNCTION

2.3.7 PLAYING MODE

2.3.8 EQ MODE

2.3.9 EQ MODE

2.3.10 MY EQ SETUP

2.3.11 WALLPAPER SELECT

2.3.12 RECORD

2.3.13 TUNING

2.3.14 E-BOOK

2.3.15 CALENDAR

2.4 SYSTEM SETUP

2.4.1 LANGUAGE

2.4.2 TIMING POWER-OFF

2.4.3SCREEN SAVER TIME

2.4.4 BRIGHTNESS

2.4.5 FM CHANNEL

2.4.6 SOUND OF PRESSING

2.4.7 DEFAULT SETTINGS

2.4.8 FIRMWARE UPGRADING

2.4.9 SYSTEM INFORMATION

2.4.10 FORMAT

2.5 SPECIFICATION

Chapter Three Principle and Servicing

Section One Principle of the Player

3.1.1 Block diagram of the player

3.1.2 Principle of the player

3.1.3 Introduction to IC used by the player

Section Two Unit Circuit Principle

3.2.1 Video decode circuit principle

3.2.2 Audio decode circuit principle

3.2.3 FLASH circuit

3.2.4 FM tuning circuit

3.2.5 Display screen boost circuit

3.2.6 USB jack circuit

3.2.7 Headphone output jack circuit

3.2.8 Button circuit

3.2.9 Charge management circuit

3.2.10 Battery voltage detect circuit

3.2.11 Battery protection circuit

3.2.12 Power management module

3.2.13 Reset circuit

3.2.14 Power on/off control circuit

3.2.15 MIC circuit

Section Three Servicing Cases

3.3.1 Servicing cases

3.3.2 Troubleshooting diagram

Section Four Signal waveform diagram

Section Five Function Introduction to IC

3.5.1 Function introduction to HY57V641620E

3.5.2 Function introduction to Rk2608

3.5.3 Function introduction to RT9284B

3.5.4 Function introduction to TPS62200

3.5.5 Function introduction to MCP73832

3.5.6 Function introduction to TEA5767HN

3.5.7 Function introduction to M41T62

3.5.8 Function introduction to WM8750BL

3.5.9 Function introduction to XC6206P152MR

Chapter Four Assembly and Disassembly Process

4.1 Disassembly process of the player

4.2 Assembly process of the player

Chapter Cinque PCB board & Circuit diagram

Section One PCB board

5.1.1 Surface layer of Main Board

5.1.2 Bottom layer of Main Board

Section Two Circuit diagram

Chapter six BOM List

Chapter Seven V5 Assembly and Disassembly Process

7.1 Disassembly process of the player

7.2 Assembly process of the player

Chapter Eight V5 PCB board & Circuit diagram

Section One PCB board

8.1.1 Surface layer of Main Board

8.1.2 Bottom layer of Main Board

Section Two Circuit diagram

Chapter One About Maintenance

1.1 Safety precautions

1.1.1 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.

1.1.2 About placement position

1. Audio power amplifier cannot be installed in places with high temperature and humidity.

2. 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

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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.

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.

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1.3 Required device for maintenance

Audio Generator

Digital oscillograph ( 100MHE)

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 QUICK OPERATION

2.1.1 BUTTONS AND JACKS ILLUSTRATION

V3 video:

Push in power-off state

Push for long in power-on state

Push in playing interface

Push when recording

Push when tuning

Push when timing with stopwatch

Press when in menu operation

Press when recording

Press when in stopwatch timing interface

Press when in music playing interface

Press when in music playing, tuning, e-

book browsing, picture browsing and recording preparation interface

Press when playing or tuning

Press when in "My sound effect setting"

Press when setting clock

# #Press when browsing e-book

Press when in menu operation

#Press when playing #Press for long when playing #Press when in tuning preset state

power on power off pause/play switch pause recording mute record time enter the item or confirm the setting save record files Time/pause timing Exit and enter into main menu interface

On-line menu pops up adjust volume Adjust dB value set time

turn lines

Move cursor

the previous/next track fast backward/forward Select channel

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Press when in tuning search state

Press for long when in tuning search state

Press when in "My sound effect setting"

auto search Automanual search select the frequency that you want to set

Press when browsing picture

# #Press when browsing e-book

Press when in menu operation

#Press for long when in music playing

interface

switch pictures turn pages move cursor

A-B repeat #Press for long when in file browsing interface #Press when in file browsing interface

Delete file

return to the previous

directory #Press when in menu operation

not save the setting and then

exit from menu Hanging rope hole USB jack MIC: microphone Headphone jack HOLD button: lock buttons when pushing towards arrow direction and unlock when push towards the opposite direction.

2.1.2 POWER ON/OFF

#Power on

Press button to power on, the power-on motion picture displays and

PUSH

system enters main menu.

NOTE:

If functions of playing, tuning or recording are not used during a specified period, this player will power off automatically.

#Power off

PUSH FOR LONG

Push button for long to power off.

2.1.3 PLAY MUSIC

#Play/Pause

When playing music, pushing this button may switch between "Play" and "Pause".

#FF and FB

When playing music, press this button for long and you may enter fast forward or backward playback.

#NEXT and PREV

When playing music, press this button to skip to the previous or next track.

# Adjust volume

When playing music, press this button or for long and you may adjust volume.

#Play music

In "Music playing" menu, press button to enter Interface of browsing musical files. Press button to select songs and press button to begin playing this song. When playing music, pushing button may pause music playing, press button to return to the previous directory and press button

to exit and enter main menu interface.

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After pressing button to exit from on-line menu, pictures will be played in the means of

PRESS

slide.

2.1.6 E-BOOK BROWSING

CAUTION: #When the length of song's full path name is too

long, this song may probably not be played. #When playing music, use picture browsing functions and music will stop playing.

2.1.4 VIDEO

In main interface, select "Video" item and press button to enter. After selecting movie files through pressing button, press button to play movie and push button to pause. When playing, pressing button may skip to the previous or next movie, pressing button to enter fast forward/backward; pressing button to adjust volume and pressing button may return to the previous directory.

PRESS

After entering "E-book" item, press button to select text file and press button to browse e-book. Pressing button may turn pages; pressing button may turn lines and pressing button may enter on-line menu. When browsing e-book, press button to return to the previous directory.

PRESS

NOTE:

If some e-book format is not supportable, please switch to TXT file with ANSI encoding format

#Switch of ANSI encoding format

1. Select "Save" in "File" item.

2. After dialogue box pops up, select "ANSI" in the pop-up options of encoding and then click "Save".

NOTE:

As for movie files with large capacity, you need wait for several seconds to enter playing after pressing button.

2.1.5 PICTURE BROWSING

After selecting picture file, press button to

enter picture browsing, press button to switch pictures and press button to return to the previous directory.

PRESS

When browsing picture, press button to enter "On-line menu". In on-line menu, you may set slide, rotate leftwards, rotate rightwards and rotate 180 . Press button to enter "Slide"; after pressing button to select your desired slide interval time, press button to confirm.

2.1.7 RECORDING

In main menu, select "Record" item and press button to enter recording preparation stage. Press button to enter recording/ pause recording. When recording, pressing button may generate recording files and exit to recording preparation state. Press button to save recording files and exit to main menu. Recording files are saved in "RECORDER" file folder of "Music Playing" menu.

PRESS

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CAUTION:

#In order to avoid sudden power-off in the course of recording, you cannot record when battery is low and when disc is fully written; if recording is in process, it indicates “FULL DISC” and exits from recording.

#When recording with microphone, if you press

buttons and the sound of pressing may probably be recorded.

2.1.8 TUNING

PRESS

In main menu, select "Radio set" item and

press button to enter tuning mode. Now,

insert headphone and you may listen to radio program. After entering tuning mode, pressing button may enter "On-line menu".

Press button to exit from tuning interface and enter main menu, but tuning still proceeds.

2.1.9 RESUME PLAYING

In main menu, after selecting "Resume playing" item, press button to enter. In this menu, you may select "Music resume", "Movie resume" and "E-book resume". For instance, select "Music resume" option, after pressing button, this song begins playing

from the position where playing stopped last time.

This player adopts lithium-ion battery to supply power. In any case, connect MP4 player to computer with USB line, it will power on and begin to charge automatically. After fully charged, the player will stop charging automatically.

CAUTION:

When charging, the player body is slightly hot,

and this belongs to normal phenomenon, so please take it easy to use it. #

When electric charge of battery is too low, and when USB power supply is less than 100mA, it begins to charge, screen may probably have no display, and even battery charge is unavailable. #It takes 3 hours to charge battery with computer . #Before unplugging USB line, please stop using USB memory function firstly. Data may be lost or the player may be damaged if you unplug it directly.

2.1.12 RESET

When this player cannot be operated, please reset it. Method for reset: Push button for about 10 seconds. After reset finishes, power on again and you may use it normally.

2.2 USAGE INTRODUCTION

2.2.1 MAIN MENU ILLUSTRATION

PRESS

2.1.10 CALENDAR

In "Calendar" menu, you may set "Clock", "Calendar" and Stopwatch".

PRESS

2.1.11 CHARGE

#Play music Save audio files.

#Browse picture

Save picture files.

#Record Select “Record” to enter recording mode.

#Calendar

Select "Calendar" item to enter this mode.

#Resume playing

Play from the position where the music, movie and e-book stopped last time.

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#Video

Save video files.

#E-book

Save text files.

#FM Radio

Select to enter radio mode.

#Setup

Select "Setup" item to set system options.

2.2.2 PLAYING INTERFACE ILLUSTRATION

As for the name of recorded file “REC0001.wav”: 0001 is serial number of the current recorded track and arranged according to sequence; WAV is the file format after recording.

2.2.4 TUNING INTERFACE ILLUSTRATION

1. Current track serial number

2. total track number

3.Clock

4. Battery capacity

5. Song name

6. Song name/singer/lyrics display

7. Total track time

8. Playback progress bar

9. Playback state

10. Current playback time

11. Volume

12. Playback mode

13. EQ mode

14. Music file format

15. Sampling rate\Bit rate

2.2.3 RECORDING INTERFACE ILLUSTRATION

1.Clock

2. Battery capacity

3. Name of recorded file

4. Time that has been recorded

5. The left recordable time

6. Recording quality

1.Clock

2. Battery capacity

3. Preset mode

4. Frequency of the current radio station

5. Scanning progress bar

6. Radio station serial number

7. Volume

8. Scanning mode

9.Mono channel

2.3 BASIC OPERATION

2.3.1 USE MOBILE STORAGE

FUNCTION

This player may be used as mobile storage in Windows ME/2000/XP operating system. Under Windows 98SE operating system, the player may be used as mobile storage after drive program is being installed (please download it from BBK official website). Connect MP3 player and computer with USB transmission line. After the bottom right corner of desktop appears “ ”symbol, the mobile storage function of MP3 player may be used normally.

NOTES:

#To avoid abnormality of the player appears, you are suggested to power off firstly before connecting MP4 player with computer, and then use USB transmission line to connect Mp4 player, then connect computer. #In Windows 98 system, there is no “ ” symbol.

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2.3.2 DISCONNECT USB SAFELY

After operation finishes, click “ ” symbol on bottom right corner of Windows desktop with right button of mouse, and disconnect USB safely according to the computer prompt.

#Cancel file

When browsing files, press button for long and the cancel dialogue box will pop up. Press button to select "YES" and then press button to cancel the file.

PRESS FOR LONG

2.3.3 VIDEO CONVERSION TOOL

1. Brief introduction before use, please download video conversion tool and installation program “BBK MINIMP4 conversion tool” from BBK website and then install to computer.

2. Basic operation

1) After program runs, click “Add conversion file” button on the bottom left corner and a dialogue box pops up, shown in the following figure:

2) According to the position indicated by finger, click to select the source file required to converse and the saving target path of new file after conversing. Click "Save" button to add this conversion into conversion list. Multiple conversion tasks may be added.

NOTE:

When in playing state, files cannot be cancelled.

2.3.5 PLAY MUSIC

#PLAY MUSIC

In “music”, press button to select song,

press button to begin playing music, and the playback interface displays at the same time.

#Pause music

When playing music, press button to switch to pause playing state, and press button again to continue playing.

PUSH

#NEXT and PREV

When playing, pressing button may skip to the next track to play; and pressing button may skip to the previous track to play.

# FF and FB

When playing, pressing button for long without loose may realize fast forward.

3) Click "Begin to converse file" button to start conversing, shown in the above figure:

2.3.4 BROWSE/CANCEL FILE

#Browse file

In main menu, audio files are saved in "Music playing" item. Press or button to select files to browse upwards or downwards.

PRESS

PRESS FOR LONG

When playing, pressing button for long

without loose may realize fast backward.

#ADJUST VOLUME

When in playback interface or listening to radio set, pressing button or for long may both adjust volume.

NOTE:

#In some operating system (such as complex font Windows), the operation of copying lyrics/song file and changing song's name may

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Probably lead to incorrect display. When playing non-standard songs or songs with special format, noise may probably occur.

2.3.6 A-B REPEAT FUNCTION

When playing, if you want to listen to content of a certain segment repeatedly, please use A-B repeat function. Press button for long for the first time to select the beginning point that you want to play repeatedly and screen displays“A”; press button for long for the second time to select the end point that you want to play repeatedly and screen displays “A-B”and system begins to repeat during“A-B”period; press button for long for the third time to cancel A-B repeat and playing continues.

PRESS FOR LONG

2.3.7 PLAYING MODE

2.3.9 EQ MODE

The corresponding icons of each EQ mode

in playback interface are shown as follows:

NORMAL

ROCK

POP

CLASSIC

DBASS

JAZZ

MY EQ

Select “MY EQ”, and correspond with the sound effect that you have preset in “On-line menu” in playback mode. If you have not set “MY EQ”, it is defaulted “NORMAL” sound effect,

When cursor moves to a certain sound effect, press button to confirm the selection of this EQ mode.

2.3.10 MY EQ SETUP

In "My EQ setup" interface, the range value (dB) of each frequency range may be increased or decreased.

PRESS

The playback mode icons displayed on playback interface are shown as follows:

: Repeat playing all tracks.

: Play according to track sequence.

: Repeat file folder.

: Repeat playing single track.

: Play any track at random.

: Browse play each track for 10

seconds.

2.3.8 EQ MODE

When playing music, press button to enter “On-line” menu, press button to enter “EQ Select”, and then move cursor through pressing button to select proper EQ mode.

If you want to adjust the range of mediant (1K), you may operate according to the following diagram:

PRESS

Press button to select the frequency range that you want to adjust, and press button to adjust the range value. When adjusting the range, take 2dB as a step, and the max adjustable scope is 6dB. After setup finishes,

press button to confirm and exit; press button not to save and then exit.

2.3.11 WALLPAPER SELECT

When playing music, you may select wallpaper in“On-line” menu. Press button to enter “On-line”menu and press button to move cursor to "Wallpaper select" item. Select your favourite wallpaper and then press button to confirm.

PRESS

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2.3.12 RECORD

In main menu, after selecting “REC”, press button to enter recording ready state. In recording ready state, press button to pop up

on-line menu.

# Recording quality

If recording quality is higher, sound quality is better and space occupied is more. The two kinds of recording quality both adopt ADPCM format encoding, which is only effective to MIC recording.

#Preset

In preset mode, pressing button may adjust to the next channel and pressing button may adjust to the previous channel. #Save

In manual or automanual scanning mode, after radio station is searched, press button

to enter on-line menu. After selecting "Save", press button to confirm.

PRESS

2.3.13 TUNING

#Enter radio set mode

Select "Radio set" in main menu and press

button to listen to radio program.

#Quit radio set mode

When listening to radio program, press

button to exit and enter main menu.

#Search

When listening to radio program, press

button to enter on-line menu.

There are two kinds of scanning mode of

“Manual” and “Auto”.

1. Manual scanning Pressing button may add 0.1MHZ each

time and pressing button may decrease

0.1MHz each time. Pressing / button for long may

increase or decrease frequency continuously and will stop until radio station is searched.

#Delete

In tuning interface, press button to enter

on-lin menu, select “Delete” item, move cursor to the frequency point that you want to delete and press button to confirm.

PRESS

#FM recording

When listening to radio set, press button to pop up “On-line” menu and select “Record” item to enter FM recording. Press button to

generate recording file and exit to tuning state. Format of file generated from FM recording is WAV format and this file is saved in“FM REC” file folder of “Music playing”.

PRESS

2. Auto scanning In on-line menu, after selecting "Auto" item,

full auto scanning starts and all radio stations searched will be saved automatically.

NOTE:

During the course of (full-auto/automanual)

scanning, pres button and scanning will be stopped.

2.3.14 E-BOOK

When browsing e-book, pressing button may enter "On-line" menu. In on-line menu, you may set jump pages, save bookmark, extract bookmark, delete bookmark, auto page down, music playing, style select and font size. #Jump pages

You may press and button to set page by using this function, shown in the figure:

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After setup finishes, press button to confirm.

#Save bookmark

In on-line menu, select “Save bookmark” item

and press button to enter. Pressing button

may select th position to save and pressing button may set the current page as bookmark.

PRESS

#Extract bookmark

In on-line menu, select Extract book

mark" item and press button to enter.

Press button to select your desired bookmark and then press button to confirm.

#Delete bookmark

After selecting "Delete bookmark" item, press button to make dialogue box pop up. Select "OK" item and then press button to

delete bookmark. #Auto page down

After pressing button to enter on-line

menu, select "Auto page down" item and press

button to enter interval time setup of page down. After selecting your desired interval time, press button and the E-book will turn pages

Automatically. #Music playing

After setting "Music playing" item in "ON", you may browse E-book while listening to music. #Style select

In "Style display" item, you may set your favourite style according to your own likes.

2.3.15 CALENDAR

#Clock

In "Calendar" menu, press button to enter "Clock" item and you may set the current time.

Press button to select time format: 12hour or 24-hour system.

PRESS

Use and button to set the current time and then press button to confirm.

#Calendar

Press button to enter "Calendar" setup. Use and button to set date. #Stopwatch

In "Stopwatch" menu, press button to start

Timing. When timing, Push button to save record and press

button to stop timing

PRESS

2.4 SYSTEM SETUP

2.4.1 LANGUAGE

#Language

Press button to enter the setup, press button to select language and press button to confirm. After setup is ok, press button to return to the previous content.

2.4.2 TIMING POWER-OFF

#Timing power-off

Press button to adjust timing power-off time. After setup is ok, press button to confirm. If the timing power-ff time is set in 15-min, after 15 minutes this player will power off automatically.

CAUTION:

#Invalid is defaulted each time when power on.

#Timing power-off time is rough time and it may probably have deviation. #When recording, please do not set timing power-ff, otherwise the recording files cannot be played normally.

2.4.3

#Screen saver time

After pressing button to select screen saver time, press button to confirm. If screen saver time is set in 15 seconds and no operation happens within 15 seconds, this player will enter screen saver state automatically.

SCREEN SAVER TIME

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CAUTION:

#Screen saver time is rough time and it may have difference when playing songs with different formats. #Screen saver function is not available when in video playing, stopwatch, Ebook and pictures.

2.4.4 BRIGHTNESS

#Brightness

Press button to select proper

brightness and then press button to confirm.

2.4.5 FM CHANNEL

# FM Channel

You can select the FM channel in settings. When select Auto, it changes the channel Automatically. When select Mono, it tunes atMono channel all the time.

CAUTION:

“General radio station" is the default value

each time when power on.

2.4.6 SOUND OF PRESSING

BUTTON

#Sound of pressing button

After entering this menu, you may set "On" or "Off" for the sound of pressing buttons. When dialogue box pops up, press button to move cursor to "On" and then press button to confirm.

2.4.7 DEFAULT SETTINGS

#Default settings

If you want to restore this player in factory settings state (material and song file will not be deleted), you may select "Default settings". Press button to enter this menu, after dialogue box pops up, select "Yes" and then press button to restore in "Default settings".

2.4.8 FIRMWARE UPGRADING

# Firmware upgrading

This player supports firmware upgrading. Please refer to the description on BBK website for details.

CAUTION:

After upgrading, disk will be formatted, so please pay attention to backup materials before upgrading.

2.4.9 SYSTEM INFORMATION

#System information

In this item, you may check information of memory, remained memory and version number.

CAUTION:

Because firmware will use some space, the displayed content capacity may probably be different from the actual capacity.

2.4.10 FORMAT

#Format

When using computer to format this player, please select FAT32 file system, otherwise this player will work abnormally.

2.5 SPECIFICATION

Model

Audio decode chip

Lithium battery

Continuous playback time

Size/weight

Audio SNR

Headphone output

Frequency range

FM tuning range

Working temperature

Audio file

Picture file

V3 video

WOLFSON WM 8750

3.7V 650mAh

Longest continuous playing time for MP3 is 11 hours

Size: 85.5mm 50mm 10mm weight: 66.2g

90dB

12mW+12mW 32 ohm (25mW+25mW when headphone impedance is 16-ohm)

18Hz~20kHz

76MHz~108MHz

0 C~35 C

MPEG 1/2 Layer 3(32kbps~320kbps), WMA(32kbps 320kbps), WAV

Support DCF standard JPEG format, 6~8 million pixel at most is supportable, BMP

V5 video

WOLFSON WM 8750

3.7V 900mAh

Longest continuous playing time for MP3 is 15 hours

Size: 87mm 54mm 11mm weight: 76g

#Design and specifications of product are

subject to change without notice.

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Chapter Three Principle and Servicing

Section One Principle of the Player

3.1.1 Block diagram of the player

Block diagram of the player is shown in the picture 3.1.1.1:

POWER

MANAGEMENT

MODULE

POWER

ADAPTOR

CHARGE

MANAGEMENT

SDRAM

LDO CIRCUIT

TPS79333

DC-DC CIRCUIT

TPS62200

USB INTERFACE

AUDIO&VEDIO CODEC

USB POWER

24M CRYSTAL

LI-ION BETTERY

HEADPHONE

MICROPHONE

AUDIO CODEC

WM8750

RK2608

FLASH MEMORY

FM MODULE

TEA5767

QVGA LCD

LDO BACKLIGHT

RT9284

SWITCH CIRCUIT

RESET CIRCUIT

TOUCH-BUTTON

CONTROL

CY8C21434

TOUCH-BUTTON

ARRAY

Figure 3.1.2.1 Block diagram of the player

3.1.2 Principle of the player

V3/V5 portable Mp4 player is mainly composed of the following functional modules:

1. Decode part: main video decode chip adopts Rk2608 decode chip of Rockchip Company with

built-in ROM and RAM, which may directly drive TFT LCD screen. Main audio decode chip adopts

Wm8750 decode chip of Wolfson Company.

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2. Power supply part: composed of lithium battery, TPS79333, TPS62200 and XC6206, which is

Location number Chip Function

U1 HY57V641620ETP-7 SDRAM

U2 RK2608 Main video decode board

U3 RT9284B 12V voltage DC-DC conversion

U4, U5 K9G8G08U0M FLASH

U6 TPS62200 1.8V voltage DC-DC conversion

U8 MCP73832 Charge management

U9 TEA5767HN Tuning chip

U10 M41T62 Real-time clock

U11 WM8750BL Audio encode/decode

U14 XC6206P152MR 1.8V voltage stabilizing

U15 CY8C21534 Touch button control

U16 TPS79333DBVR 3.3V voltage DC-DC conversion

Location number Chip Function

U1 WM8750BL Audio encode/decode

U2 HY57V641620ETP-7 SDRAM

U3 RK2608 Main video decode

U4, U5 K9G8G08U0M FLASH

U6 M41T62 Real-time clock

U7 TEA5767HN Tuning chip

responsible for power supply circuit of each part of the entire MP3.

3. Peripheral jack” composed of headphone output port, MIC input port and USB jack. Headphone

jack is the audio output jack of the player, MIC is the audio input jack of external recording and USB jack

fulfills internal and external data exchange of the machine to realize charge function.

4. Data storage module: composed of Flash and peripheral circuit to fulfill data storage of the player.

5. Display module: V3 adopts 2.4” high-bright QVGA screen and V5 adopts 3” high-bright 16:9 LCD

screen.

6. Tuning module: FM tuning.

3.1.3 Introduction to IC used by the player

1. IC used by the main board of V3 is shown in the following picture:

2. IC used by the main board of V5 is shown in the following picture:

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U8 SSD1928QL9 LCD drive

U10 RT9284B 12V voltage DC-DC conversion

U11 TPS79333DBVR 3.3V voltage DC-DC conversion

U12 TPS62200 1.8V voltage DC-DC conversion

U13 MCP73832 Charge management

U14 XC6206P152MR 1.8V voltage stabilizing

U15 CSTCR4M00G55 SMD ceramic resonance

U1 CY8C21534 Touch button control

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Section Two Unit Circuit Principle

3.2.1 Video decode circuit principle

1. Video decode circuit is mainly composed of main decode chip Rk2608, SDRAM and peripheral

circuit. Rk2608 may realize video file decode playing of MPEG-4 format in low frequency and power

consumption with clear and smooth picture quality, meanwhile, Rk2608 integrates large amount of I/O

control jacks which may provide the max flexibility. The internal principle block diagram of Rk2608 is

shown in the picture 3.2.1.1. Low power consumption function of Rk2608 may prolong battery usage

time for portable player and its integrated intelligent lithium battery charger supports voltage control

(AVC) and its integrated power management unit includes a DC-DC converter on high effective plate,

which supports multiple battery configuration, such as 1×AA, 1×AAA and Li-ion battery. What’s more,

compared with the traditional voltage control system, AVC enables chip to operate with higher peak

value CPU working frequency to make the highest running speed up to 100 MIPS. Rk2608 supports

DRM10 digital copyright management technology based on SOFTWARE. Rk2608 with multi-function

management function, which may realize the function that listening to music while viewing e-book or

playing e-games. Rk2608 chip integrates USB 2.0 High Speed/Full Speed PHY with hugher

transmission speed and integrates the controller that supports TFT/CSTN/OLED colorful screen.

Figure 3.2.1.1 Internal principle block diagram of Rk2608

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2. Working principle: when the machine power on, reset circuit keeps high level reset signal. After

RK2608 completes reset through reset pin 113, reset signals output from pin 56 to pin 42 of SSD1928 to

enable SSD1928 to finish reset (V3 screen need no SSD1928 drive, so there is no this reset process), at

the same time reset signals are sent to enable end of RT9284, boost circuit begins to work and screen is

lightened. Meanwhile, 1.8V and 3.3V power circuit begins to supply power for RK2608, 24M crystal

oscillator Y1 oscillates and decode chip begins to work and read data saved in Flash. After RK2608

decoding, video signals are sent to SSD1928 to drive LCD screen to display through SSD1928.

3.2.2 Audio decode circuit principle

1. Audio decode circuit is mainly composed of decode chip WM8750 and peripheral circuit. WM8750

is a stereo coder/decoder with low power consumption and high quality, specially designed for portable

digital audio application. WM8750 adopts I2C bus mastering means and its internal principle block

diagram is shown in the picture 3.2.2.1.

Figure 3.2.2.1 WM8750 internal principle block diagram

2. Working principle: the digital audio signals that output after being decoded by the internal decode

circuit of RK2608 are sent to WM8750 inside for DA conversion through pin 6 of WM8750 and the analog

audio signals after conversion are sent to headphone jack for output through HP_OUTR and HP_OUTL.

When the machine is recording, external analog audio signals pass through microphone and an

INPUT pin (pin 24) of WM8750 and then are sent to AD conversion unit of WM8750 for AD conversion

and then for digital filtering, volume control and echo processing inside. The digital audio signals after

being processed are sent to main decode chip RK2608 for processing and then saved in Flash.

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When machine is in FM state, FM digital audio signals input from INPUT pin (pin 27, 28) of

WM8750, after digital filtering and echo processing inside WM8750, and then output to headphone jack

directly.

3.2.3 FLASH circuit

1. FLASH circuit schematic diagram is shown in the figure 3.2.3.1:

VCC

R35 47K

VCC

R36 47K

FCE0 FCE1

C39 104

GND

R37 10K

RD/BY

FREN

FCLE/A2

FALE/RS/A1

FWEN FWP

R40 47K

D_GND

RES#

R/B2

R/B1

CE1

CE2

VCC

VSS

CLE

ALE

NAND FLASH

NC NC NC

NC I/O7 I/O6 I/O5 I/O4

PRE

VCC

VSS

NC I/O3 I/O2 I/O1 I/O0

48 47 46 45 44 43 42 41 40 39

R32 0R

38 37 36 35 34 33 32 31 30 29 28 27 26 25

D7 D6 D5 D4

D3 D2 D1 D0

VCC

C40 104

D_GND

Figure 3.2.3.1 Flash circuit schematic diagram

2. Working principle: Flash Memory is the storage unit of the player and all AV and image files must

be stored in FLASH. Flash module is composed of two groups of FLASH chip K9G8G08U0M with the

specification 2G (H model is 4G). Flash chip and main decode RK2608 are connected through 8 data

lines to complete the read, write and delete of inside files. VCC provides 3.3V voltage for FLASH

working. R35, R36 are pull-up resistor of /CE and R40 is pull-down resistor of /WP. VCC is power supply

pin of FLASH. /CE is chip-selection signal, effective when in high level. VCC supplies 3.3V voltage and

FLASH begins working. /RE, /WE are read-effective and write-ettective signal ports to control rear and

write function of FLASH. I/O1 I/O8 are 8 data lines to fulfill the exchange of FLASH and outside data to

realize the function of write, delete and edit of Mp3.

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There is firmware of the player’s working inside Flash and all tasks are completed by CPU to send

out relevant order after the data exchange between CPU and Flash. When the player power on, 3.3V

voltage supplies power for Flash through VCC, /CE inputs 3.3V high level signal and Flash begins to work

effectively. When playing video files, /RE is high level, Flash performs the operation of read out. When

files are written in through USB data line or recording through microphone, /WE is high level and Flash

performs the operation of writing in. The operation of read out and writing in is performed through

I/O1~I/O8 dateladdress lines.

3.2.4 FM tuning circuit

1. FM tuning circuit diagram is shown in the figure 3.2.4.1

FM_3V3

R69 22R

C68 104

FM_ANT

FM_3V3

FSGND

FM_ANT

L17 33nH 2%

L18 33nH 2%

C66 103

C56 101

R73 22R

D10

BB202

D11

BB202

FM_3V3

FDGND

C76 104

L16 120nH

C57 27PF

FDGND

C59 47PF

R70 100K

FSGND

R68 10K

C65 393

L23 601 DCR<350m

L24

C58 472

N.C

CPOP

VCOT1

VCOT2

VCOVCC

DGND

DVCC

DATA

CLOCK

N.C

FDGND

601 DCR<350m

N.C

W/R11BUSM12BUSEN13SWP114SWP215XTAL116XTAL217PDLF18PHLF19N.C

RFI2

TCAGC

RFGND

LOOPSW

TEA5767HN

NECTAR-I

FM_3V3

I2C_SCL

I2C_SDA

RFI1

AVCC

AGND

R67 18K

N.C

IFGAI

DIFL2 DIFL1

TCIFC

VREF MPXO

TMUTE

RAVO

LAVO

C60 475/X5R

N.C

R66 10R

C61 473

C63 473

C67 333

601 DCR<350m

C73 22PF

FDGND

FSGND

FDGND

FSGND

R72 33K

C74 223

FDGND FDGND

C72 223

5767R

5767L

C75 102

C62 473

XT1

32.768KHz

C64 333

C71 102

FDGND

FSGND

30 29 28 27 26 25 24 23 22 21

Figure 3.2.4.1 FM tuning circuit diagram

2. Working principle: tuning circuit is composed of the micro digital tuning IC TEA5767 of Philips

Company and peripheral circuit. C56, C57, C58, C59, L16 is the antenna input matching circuit of FM

module; variant diode D10, D11 and winding inductor L17, L18 is frequency selection tuning circuit in FM

module. The control of FM adopts IIC bus control means and 9, 10 of TEA5767 are data and control

lines.

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When MP3 player switches in FM tuning state, antenna is sent to the RF band-pass filter

(87.6MHz~108MHz and 76MHz 87.5MHz) composed of Li6, C57 and C59 through C56 coupling and

then to pin 35, 37 of TEA5767 for amplifying through TEA5767 inside. Pin 2, 3, 4 of TEA5767 is

connected with the internal VCO and with variant diode D10, D11 externally. Pin 2 id tuning voltage

output pin and voltage changes within 1V when in auto search. VCO power supply is sent to pin 5 of

TEA5767 by FM 3V3 through 69 limit and C68 filtering. The built-in I2C jack is controlled through pin 8, 9

of TEA5767 and CPU performs operation of channel search and selection through I2C bus. Digital power

is sent to pin 7 of TEA5767 by FM 3V3 through R73 limit and C76 filtering. XT1 (32.768) produces basic

clock of 32.768 and inputs to TEA5767 from pin 17. Analog audio signals after being processed by

TEA5767 output to rear stage power amplifying circuit from 23 (right channel), 22 (left channel) for

amplifying and then output through headphone jack.

3.2.5 Display screen boost circuit

1. Display screen boost circuit diagram is shown in the picture 3.2.5.1:

L9 601/0603

C35

106/X5R

BACK_EN

BACK_L

R61 0R*

R59 1K

R60 10K

L10

CDRH3D16-100

R63

0R*

Figure 3.2.5.1 Display screen boost circuit

VCC

GND

RT9284B

OVP

MBR0520/SOD123

102

R30

12R¡À1%

LED-

D_GND

L11 601/0603

C36

106/16V/1206

LEDP

LED+

2. Working principle: 12V high voltage is needed for lightening display screen, so the boost circuit

must be matched to fulfill. This circuit includes two parts: boost circuit and display screen jack circuit.

Boost circuit is composed of DC-DC control IC Rt9284 and peripheral circuit; VIN is power input; EN is

enable end of Rt9284, effective when in high level; SW is high voltage output pin and FB is feedback pin.

After power on, the internal boost circuit of L10 and Rt9284 begins to boost and storage energy.

When current of L10 reaches 750mA, RT9284 internal switch turns off, and supplies power for the rear

circuit through external diode D3 at the same time when the switch is off. Voltage divide detect circuit

sends the detected voltage in pin 3 of RT9284. When detect voltage of pin 3 is lower than 1.235V

reference voltage (this IC has a 1.235V reference voltage comparator inside), the internal switch is on,

the internal boost circuit of L10 and RT9284 begins to boost and store energy. When current of L10

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