BBK V7N, V7H service manual

V7N V7H

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 PLAYING

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 RESET

2.1.11 CHARGE

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

2.2.5 USE MOBILE STORAGE

2.2.6 DISCONNECT USB SAFELY

2.2.7 VIDEO CONVERSION TOO

2.3 OTHER INFORMATION

2.3.1 ADDITIONAL INFORMATION

2.4 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

Section Two Unit circuit principle

3.2.1 Video decode circuit principle

3.2.2 Audio decode circuit principle

3.2.3 FLASH CIRCUIT PRINCIPLE

3.2.4 FM tuning circuit

3.2.5 Display screen boost circuit

3.2.6 Headphone output jack circuit

3.2.7 USB jack ciircuit

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 Troubleshooting diagram

3.3.2 servicing cases

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 MCP73832

3.5.5 Function introduction to TEA5767HN

3.5.6 Function introduction to XC6206P152MR

3.5.7 Function introduction to K9G8G08U0M

Chapter Four Assembly and disassembly process

4.1 Disassembly process of the player

4.2 Assembly process of the player

Chapter CinquePCB board & Circuit diagram

Section One Circuit diagram

Section Two PCBboard

Surface layer of Main Board

Bottom layer of Main Board

Chapter six BOM List

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

- 1 -

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.

- 2 -

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

- 3 -

Chapter Two

Functions and Operation Instructions

2.1 QUICK OPERATION

2.1.1 BUTTONS AND JACKS ILLUSTRATION

Press in power-off state

Press for long in power-on state

Press in playing interface

Press when recording

Press when tuning

#Press when in menu operation

#Press when recording #Press when in music playing, tuning, e-book browsing, picture browsing and recording preparation interface #Press for long when in music playing interface #Press for long when in file browsing interface #Press when in file browsing interface #Press when in menu operation

#Press when playing or tuning #Press when in "My sound effect setting" #

Press when browsing e-book

#Press when in menu operation

Press when playing

Press for long when playing

Press when in tuning preset state

Press when in tuning search state

power on power off pause/play switch pause recording mute enter the item or confirm the setting save record files

On-line menu pops up A-B repeat delete file return to the previous directory Not save the setting and then exit from menu adjust volume adjust dB value

turn lines

move cursor

the previous/next track fast backward/forward select channel auto search

- 4 -

Press for long when in tuning search state

Press when in "My sound effect setting"

Press when browsing picture

# #Press when browsing e-book

Press when in menu operation

USB jack

automanual search select the frequency that you want to set switch pictures turn pages move cursor

Headphone jack

MIC: microphone

2.1.2 POWER ON/OFF

#Power on

Press button to power on, the

PUSH

power-on motion picture displays and 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

#FF and FB

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

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.

PRESS

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.

- 5 -

2.1.4 VIDEO PLAYING

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

PRESS

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

2.1.6 E-BOOK BROWSING

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.

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".

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.

CAUTION:

#In order to avoid sudden power-off in the

# When recording with microphone, if you press

PRESS

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.

buttons and the sound of pressing may probably be recorded.

- 6 -

2.1.8 TUNING

PRESS

In main menu, select "Radio " 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.

PRESS

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.

2.2 USAGE INTRODUCTION

2.2.1 MAIN MENU ILLUSTRATION

#Play music Save audio files.

#Browse picture

Save picture files.

#Record Select “Record” to enter recording mode.

Setup

Select "Setup" item to set system options.

2.1.10 RESET

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

2.1.11 CHARGE

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.

Video

Save video files.

#E-book

Save text files.

#FM Radio

Select to enter radio mode.

#Resume playing

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

- 7 -

2.2.2 PLAYING INTERFACE ILLUSTRATION

1. Song name

2. Song name/singer/lyrics display

3. Volume

4. Current playback time

5. Total track time

6. Playback progress bar

7. Playback state

8. Bit rate

9.Sampling rate

10. EQ mode

11. Playback mode

12. Music file format

13. Battery capacity

14. Current track serial number

15. total track number

2.2.3 RECORDING INTERFACE ILLUSTRATION

1.Name of recorded file

2. Time that has been recorded

As for the name of recorded file “V00001. Wav”: 00001 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

3.The left recordable time

4. Battery capacity

ILLUSTRATION

1. Volume

2. Frequency of the current radio station

3. Scanning progress bar

4. Radio station serial number

5.Preset mode

6.Battery capacity

7.Scanning mode

2.2.5 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.

2.2.6 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.

2.2.7 VIDEO CONVERSION TOO

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.

- 8 -

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.

2.4 SPECIFICATION

Model

Lithium battery

Continuous playback time

Size/weight

Audio SNR

Headphone output

Frequency range

FM tuning range

Working temperature

Audio file

Picture file

#Design and specifications of product are

subject to change without notice.

3.7V 600mAh

Longest continuous playing time for MP3 is 11 hours

Size: 85.0mm 43.5mm 12.3mm weight: 54g

85dB

5mW+5mW 32 ohm (10mW+10mW when headphone impedance is 16-ohm)

18Hz~20kHz

87MHz~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

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

2.3 OTHER INFORMATION

2.3.1 ADDITIONAL INFORMATION

#Longest playing time

When playing MP3 musical files with 128kbps bit rate and 44.1kHz sampling rate in sate of proper volume, "Normal"sound effect and screen saver, the longest playing time of this player is about 11 hours . Playing time in other cases will be different.

#Accessories

1)Headphone

2)User manual

3)USB transmission line4)Warranty card

5)Hanging strip

6)Protection case #The lowest computer configuration Requirements

1)Above Windows98SE/2000/XP/ME,Mac8.5

2)Pentium 200MHz centre processor or above

3)CD-ROM drive

4)40MB spare hard disc space

5)32MB memory

6)USB jack

- 9 -

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:

V7 Block Diagram

USB POWER

ADAPTOR POWER

CHARGE

MANAGEMENT

USB INTERFACE

24M CRYSTAL

LI-ION BETTERY

HEADPHONE

MICROPHONE

3.3V

1.8V

SDRAM

BUILT-IN LDO

CIRSUIT

BUILT-IN DC-DC

CIRCUIT

AUDIO&VEDIO CODEC

FLASH MEMORY

QVGA LCD

LDO BACKLIGHT

RT9284

SWITCH CIRCUIT

RK2606

RESET CIRCUIT

BUTTON ARRAY

FM MODULE

TEA5767

Figure 3.1.1.1 Block diagram of the player

3.1.2 Principle of the player

V7 portable MP4 player is mainly composed of following functional modules :

1. Decode parts : main decode chip adopts Rk2606 of Rockchip company with built-in ROM and

RAM, which can directly drive TFT LCD screen;

- 10 -

2. Lithium battery part: composed of lithium battery and charge managing circuit, which supply

power for the player.

3. Periphery interface periphery interface is composed of earphone output, MIC input and USB

interface. Earphone interface is the audio output interface of the player, MIC is audio input of periphery

recording, USB jack finishes internal and external data switch of the player to realize charge function.

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

5.Display module:1.8 inch high-bright LCD screen.

6. Tuning module: FM tuning.

- 11 -

Section Two Unit circuit principle

3.2.1 Video decode circuit principle:

Video decode circuit is mainly composed of main decode chipRK2606,SDRAM and peripheral circuit.RK2606

can realize MPEG-4 format in low frequency and power consumption with clear and smooth picture. Meanwhile,

Rk2606 integrates large amounts of I/O control jacks which may provide a max flexibility. Internal principle block

diagram of RK2606 is shown in picture3.2.1.1

Figure 3.2.1.1 Internal principle block diagram of Rk2608

Figure 3.2.1.1 Internal principle block diagram of Rk2606

1.Video decode circuit is mainly composed of main decode chipRK2606,SDRAM and peripheral

circuit.RK2606 can realize MPEG-4 format in low frequency and power consumption with clear and

smooth picture. Meanwhile, Rk2606 integrates large amounts of I/O control jacks which may provide a

max flexibility. Internal principle block diagram of RK2606 is shown in picture3.2.1.1. Low power

consumption function of Rk2606 can prolong battery usage time for portable player and its integrated

lithium battery charger supports voltage control (AVC) and its integrated power management unit

includes a DC-CD switch on high effective plate, which support ,multiple battery configuration, such as

1×AA,1×AAA, Li-ion battery. What is more, compared with traditional voltage control system, AVC

enables chip to operate with higher peak value CPU working frequency to make the highest running

- 12 -

speed up to 100 MIPS. Rk2606 supports DRM 10 digital copyrght management technology based on

Microsoft.. Rk2606 has multi-mission dealing function, which can realize functions that listening to

music when viewing e-book or playing e-games. Rk2606 chip integrates USB 2.0 High Speed/Full

Speed PHY, which realizes a faster transmission speed. It also integrates controller that supports

TFT/CSTN/OLED colourful screen.

2.When the player power on, reset circuit keeps high level reset signal. After Rk2606 completes

reset through reset pin 115, reset signals output from pin 43 to enable end of Rt9284 to make boost

circuit work and the screen is lighten. Meanwhile, 1.8Vand3.3V circuit begin to output, 24M crystal

oscillator Y1 oscillates and decode chip begins to work and read data saved in Flash. After Rk2606

decoding, video signals are sent to LCD display screen to display.

3.2.2 Audio decode circuit principle

Audio decode chip is mainly composed of main decode chip Rk2606 internal audio decode CODEC

and periphery circuit. RK2606 internal CODEC adopts I2C bus controlling format. After the audio files

inside FLASF being processed through DSP, audio signals are sent to RK2606 internal audio decode

CODEC to decode and output from pin 75, 80 of Rk2606 and output from earphone jack at last.

When the machine is recording, external analog audio signals are sent to pin 70 of Rk2606 through

microphone. After processed by Rk2606 internal audio decode CODEC and conversed through AD

conversion unit, the digital audio signals are saved in FLASH.

When the machine is in FM mode, FM digital audio signals input from pin68,69 of Rk2606 and

directly output to earphone OUTPUT pin interface after digital filter and echo process.

3.2.3 FLASH CIRCUIT PRINCIPLE

1.FLASH circuit is shown in picture 3.2.3.1

VCC

R37 47K

VCC

R38 47K

FCE0 FCE1

C63 104

GND

R39 10K

RD/BY

FREN

FCLE/A2

FALE/RS/A1

FWEN FWP

R49 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

R43 0R

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

D7 D6 D5 D4

VCC

C64 104

D_GND

D3 D2 D1 D0

Figure 3.2.3.1 Flash circuit principle

- 13 -

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

are saved in FLASH. FLASH modules are composed of two groups FLASH chip K9G8G08U0M with the

specification2G H model is4G .Flash chip and main decode Rk2606 are connected through eight

data lines to complete the read, write and delete works. VCC provides 3.3V voltage for FLASH working.

R37,R38 is pull-up resistor of /CE and R49 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 to work. /RE /WE are read-effective and write-effective signal ports to control read and write

function of FLASH.I/O1 I/O8 are eight data lines to complete external data exchange of FLASH and

realize function of write, delete and edit of Mp3.

There is firmware of the player’s working in Flash, all tasks are completed by CPU to send relevent

order after 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 signals and Flash begins an effective work.

When playing AV files,/RE is high level, Flash performs the operation of read out. When files are written

through USB data line or recording through microphone, /WE is in high level and Flash performs the

operation of write in. The operation of read out and writing in are performs through I/O1 I/O8 eight

data/address line.

3.2.4 FM tuning circuit

1.FM tuning circuit is shown in picture 3.2.4.1:

2. Working principle: tuning circuit is composed of mini digital tuning IC TEA5767 of Philips and

peripheral circuit. C68, C69, C70, C71 and L21 input matching circuit for antenna of FM module; Varicap

diode D3, D4 and winding inductor L22, L23 is frequency selection tuning circuit in FM module. The

control of FM adopts two-line IIC bus method and 9, 10 of TEA5767 are date and control line.

When Mp3 player switches into FM tuning state, antenna is sent to RF band-pass filter (87.6MHz

108MHz and 76MHz 87.5MHz) composed of L21, C69, C71 through C68 coupling and then to pin 35,

37 of TEA5767 for amplifying inside TEA5767. Pin 2, 3, 4 of TEA5767 is connected with internal VCO,

and connected with diode D3, D4 externally. Pin 2 is tuning voltage output pin and voltage changes in

1V when in auto search. VCO power supply is sent to pin 5 of TEA5767 by FM 3V3 through R56 limit and

C81 filter. The built-in I2C jack is controlled through pin 8, 9 of TEA5767 and CPU performs operations

of channel search and selection through I2C bus. Digital power supply is sent to pin 7 of TEA5767 by FM

3V3 throughR58 limit, C90 filter. XT1 32.768 produces basic clock of 32.768 and inputs to TEA5767

from pin 17. Analog audio signals after processed by TEA5767 output to rear stage power amplifying

from 23 (right channel), 22( left channel ) and then output through earphone jack.

3.2.5 Display screen boost circuit

1.Display screen boosts circuit is shown in picture 3.2.5.1

- 14 -

FM_3V3

R56 22R

C81 104

FM_ANT

FM_3V3

SGND

FM_ANT

L22 33nH 2%

L23 33nH 2%

C68 101

C78 103

R58 22R

BB202

FM_3V3

SGND

C90 104

L21 120nH

C69 27PF

SGND

C71 47PF

R70 100K

SGND

R68 10K

C65 393

L27 601 DCR<350m

L28

C70 472

N.C

CPOP

VCOT1

VCOT2

VCOVCC

DGND

DVCC

DATA

CLOCK

N.C

SGND

601 DCR<350m

N.C

W/R11BUSM12BUSEN13SWP114SWP215XTAL116XTAL217PDLF18PHLF19N.C

RFI2

TCAGC

RFGND

LOOPSW

TEA5767HN

NECTAR-I

FM_3V3

I2C_SCL

I2C_SDA

RFI1

AVCC

AGND

R52 18K

N.C

IFGAI

DIFL2 DIFL1

TCIFC

VREF MPXO

TMUTE

RAVO

LAVO

C72 475/X5R

N.C

R51 10R

C73 473

C74 473

C75 473

C77 333

SGND

30 29 28 27 26 25 24 23 22 21

32.768KHz

L24

L25

XT1

C79 333

601 DCR<350m

C85 102

SGND

C87 22PF

SGND

C80 105

C82 105

SGNDSGND

R57 33K

C88 223

SGND

FM_OUTR

FM_OUTL

C86 223

SGND

C89 102

L18 601/0603

C52

106/X5R

BACK_EN

Figure 3.2.4.1 FM module circuit diagram

R30 100R

R33 10K

L19

CDRH3D16-100

VCC

OVP

GND

RT9284B

MBR0520/SOD123

Figure 3.2.5.1 Display screen boost circuit

C51

102

R34

12R 1%

LED-

D_GND

L20 0R/0603

C53

106/16V/1206

LED+

- 15 -

2.12V 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, FB is feedback pin.

After power on, voltage divide detect circuit sends detected voltage to pin 3 of RT9284. When

voltage detected by pin 3 is lower than reference voltage1.235V this IC has a1.235 V reference

voltage comparator inside ), the internal switch is saturated and internal boost circuit of L19 and

RT9284 begin to boost and store energy. When current of L19 reaches to750mA, the internal switch of

Rt9284 turns off and power is supplied to rear circuit through external diode D2 until feedback voltage is

lower than reference voltage again. As for this PFM peak current control scheme adopted by convertor

discontinuous conduction means (DCM), the frequency depands on output current and makes the

frequency of entire load very high. Pin 4 of Rt9284 is working enable pin and connect with pin43 of

Rk2606 to control level exchange through software to complete control of Rt9284 to realize screen-

save function.

When machine power on, display screen performs data communication through rear CPU, and

restores driving current signals sent by CPU onto display screen. Signals sent by CPU are different and

display screen makes different displays, so we can see different displays and also CPU controls

screen-save function through software setup.

3.2.6 Headphone output jack circuit

1.Headphone output circuit is shown in picture 3.2.6.1:

2.The left/right channel audio signals directly output from Rk2606 to earphone jack, D1 in the

circuit is TVS diode array used for ESD protection. Ground wire of headphone is also used for antenna

input of FM module.

OUTL

HP_OUTR

HP_OUTL

R2 10R

R1 10R

1 3 4 5

2SJ-A382-001(HP-DC)

CN1

OUTR

L1 601

L2 601

FM_ANT

R102 0R*

GND

AOM

AOMS

162

RCLA MP0504F/SC-70

104

Figure 3.2.6.1 Headphone output jack circuit

- 16 -

104

L3 601

L4 601

FM_ANT

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BBK V7N, V7H service manual

Specifications and Main Features

Frequently Asked Questions

User Manual