BBK X23 Service Manual

X23(RU)

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 USAGE INTRODUCTION

2.1.1 FUNCTIONS AND FEATURES

2.1.2 BUTTONS AND JACKS ILLUSTRATION

2.1.3 MAIN MENU ILLUSTRATION

2.1.4 PLAYING INTERFACE ILLUSTRATION

2.1.5 TUNING INTERFACE ILLUSTRATION

2.1.6 RECORDING INTERFACE ILLUSTRATION

2.2 BASIC OPERATIONl

2.2.1 INSTALL USB DRIVE PROGRAM

2.2.2 USE MOBILE STORAGE FUNCTION

2.2.3 DISCONNECT USB SAFELY

2.2.4 BROWSE/CANCEL FILE

2.2.5 PLAY MUSIC

2.2.6 A-B REPEAT FUNCTION

2.2.7 RECORDING

2.2.8 TUNING

2.3 SETTINGS

2.3.1 SETTINGS

2.3.2 PLAY MODE

2.3.3 EQ SELECT

2.3.4 SLEEP

2.3.5 PLAYLIST

2.3.6 FM CHANNEL

2.3.7 LOCK SETUP

2.3.8 SCREEN SAVE

2.3.9 ADVANCED

2.3.10 ADVANCED

2.4 SSPECIFICATION

Chapter Three Principle and Servicing

section One Principle of the Player

3.1.1 Function introduction

3.1.2 Block diagram of the player

3.1.3 Introduction to IC of the player

Section Two Unit Circuit Principle

3.2.1 FLASH circuit

3.2.2 FM tuning circuit

3.2.3 OLED module circuit

3.2.4 USB jack circuit

3.2.5 Button circuit

3.2.6 Headphone jack circuit

3.2.7 Power on/off control circuit

3.2.8 Reset circuit

3.2.9 MIC circuit

3.2.10 Low voltage detecting 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 PNX0101ET

3.5.2 Function introduction to K9F2G08U0M

3.5.3 Function introduction to TCM809ZVBN713

3.5.4 Function introduction to PQ1X281M2ZP

3.5.5 Function introduction to Si1912

3.5.6 Function introduction to Lm2713

3.5.7 Function introduction to TEA5767HN

Chapter Four Disassembly and Assembly Process

4.1 Disassembly process of the player

4.2 Assembly process of the player

4.3 Disassembly and assembly process for OLED screen

4.4 Disassembly and assembly process for USB jack

Chapter Cinque PCB board & Circuit diagram

Section One PCB board

Section Two circuit diagram

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 USAGE INTRODUCTION

2.1.1 FUNCTIONS AND FEATURES

#Philips PNX0101 audio decode chip

Adopt famous Plilips PNX0101 audio decode chip, special for Hi-Fi MP3 player, forcefully making

up audio signal loss when compressing MP3 to revert audio signal better.

#Play MP3/WMA/WAV files Support 16kbps ~ 320kbps MP3 file and 8kbps ~ 192kbps WMA file.

#Mobile storage function

Capable of downloading files from Windows resource manager.

#FM tuning

Full-auto, automanual and manual scanning function may listen to FM radio station program more

easily.

#Voice recording function May be used to record in class, meeting and interview.

#USB 2.0 transmission (full speed)

USB2.0 full speed data transmission.

#Support firmware upgrading function

Support upgrading function. You may add new function to the built-in program of this player

conveniently.

2.1.2 BUTTONS AND JACKS ILLUSTRATION

#Press in power off mode #Press for long in power on mode #Press in playback interface #Press when recording #press when tuning #press in tuning SCAN mode #press when operating in menu

#Press in playback interface #Press for long in playback interface #Press in tuning PRESET mode

power on power off switch in pause/play pause recording mute save radio station and switch mode to PRESET enter selected item or confirm setup the previous/next track fast backward/forward select channel

- 4 -

#Press for long in tuning PRESET mode #Press in tuning SCAN mode #Press for long in tuning SCAN mode #When operating in menu #Press or for long in “My EQ”

#Press for long in any mode #Press when tuning #Press for long when recording #Press when operating in menu

Press when playing

# #Press in playback interface or when tuning #Press in "My EQ" #Press "-" button when browsing file #Press "+" button for long when tuning

USB jack

Headphone jack

MIC: microphone

2.1.3 MAIN MENU ILLUSTRATION

full auto scanning manual scanning automanual scanning move cursor or set item select the frequency point you want to set

enter main menu switch in PRESET and SCAN mode quit recording not save the setup and return to the previous menu

Set A-B reread

adjust volume adjust dB value enter cancelling file dialogue box enter FM recording

#My music

Memorize music file.

#My Voice

Memorize microphone recording file, such as meeting, classroom and interview recording, etc.

#Resume Play

Select "Resume Play" and the player begins to play from the position that music stopped playing

ast time.

#REC Select "REC"to enter recording mode.

#FM Radio

Select " FM Radio"to enter radio setmode.

#System Setup

Select " System Setup" to set system items.

2.1.4 PLAYING INTERFACE ILLUSTRATION

Playback state

Serial number of the current track

Number of all tracks

Sound effect mode

Playback mode

Battery capacity

ID3 information/singer/lyrics display

Time that has been played of the current track

Spectrum of the currenttrack

- 5 -

2.1.5 TUNING INTERFACE

ILLUSTRATION

PRESET mode (normal receiving)

Battery capacity

Frequency of the current radio station

PRESET channel display

SCAN mode (scanning)

2.1.6 RECORDING INTERFACE

ILLUSTRATION

3. After installation finishes, restart the computer and you may use the mobile storage function normally.

Shown as the following figure:

Name of recorded file

Battery capacity

Time that has been recorded

The left recordable time

Recording state

As for the name of recorded file"V001.WAV": 001 is serial number of the current recorded track and arranged according to sequence; WAV is file format after recording.

2.2 BASIC OPERATION

2.2.1 INSTALL USB DRIVE

PROGRAM

If your computer is Windows 98, you must install drive program if you want to use the mobile storage function of MP3 player in computer.

1. Place USB drive disc into CD-ROM driver of

computer.

2. Connect MP3 player to computer, and the computer will automatically indicate that new

firmware device has been found, and run the installation guide, shown as the following figure. You only need to find the drive information file on disc according to prompt information to finish the installation of drive program.

2.2.2 USE MOBILE STORAGE

FUNCTION

This player can be used as mobile storage in Windows ME/2000/XP operating system. In Windows 98SE and Mac operating system, drive program must be installed firstly and then used as mobile storage.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.

NOTE: #To avoid abnormality of the player appears, you

are suggested to power off firstly before connecting MP3 PLAYER with computer, and then use USB transmission line to connect MP3 PLAYER, then connect computer.

#In Windows 98 system, there is no “ ”symbol.

2.2.3 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.

2.2.4 BROWSE/CANCEL FILE

#BROWSE FILE

- 6 -

In any case, press button for long to enter "Main Menu". Music fileand recording file are separately saved in the first two items of main menu, "My Music" and "My Voice". Press

button to select upward or downward and then press button to enter files browsing.

are only for the current track. After fast backward/forward to the beginning/ending of track, it switches into normal playback automatically #ADJUST VOLUME

PRESS FOR LONG

PRESS

display of adjusting volume in music playback

#CANCEL FILE

interface is shown as follows:

When browsing files, press button and the cancel dialogue box will pop up.

Press button to select "YES" and

then press button to cancel the file. Select "NO" or press button to exit.

#Music playback will be paused when browsing

PRESS

#In some operating system (such as complex

2.2.5 PLAY MUSIC

#PLAY MUSIC

Press button to select song In "My Music". Press button or select playback in main menu to begin playing music, meanwhile the playback interface displays. #PAUSE PLAYING MUSIC

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

#NEXT and PREV

When playing, pressing button may skip to the next track to play. If playback time of the current track is less than 5 seconds, pressing button may skip to the previous track to play, otherwise the current track will be played again if playback time is more than 5 seconds.

#3FF and FB

When playing, pressing button for long may realize fast forward.

pressing buttons may probably has slow response or has no lyrics display. When playing some non standard songs or songs with special format, noise may probably occur.

certain segment repeatedly, please use A-B repeat function.Press button for the first time to select the beginning point that you desire

PRESS

to repeat play and screen displays " ";press it for the second time to select the ending point that you desire to repeat play and screen displays " “, and system begins to repeat play between A-B segment. Press button for the third time to cancel repeat and continue to play.

and press button for long to exit recording

PRESS FOR LONG

and then make files.

CAUTION: Fast forward and fast backward operation

When playing or tuning or tuning, pressing button or for long way adjust volume. The

CAUTION:

file.

font Windows), the operation of copying lyrics/song file and changing song's name may probably lead to incorrect display.

When playing WMA songs of VBR ,

2.2.6 A-B REPEAT FUNCTION

When playing, if you want to listen to a

PRESS PRESS PRESS

2.2.7 RECORDING

When recording, press button to pause

When playing, pressing button for long may realize fast backward.

PRESS FOR LONG

PRESS

PRESS FOR LONG

CAUTION:#To avoid sudden power-off when recording, you cannot record when in low battery and when disc is fully written.

- 7 -

If you are recording, it indicates "FULL DISC" and exits recording. #When recording with microphone, if you press

buttons and the sound of pressing may probably be recorded.

2.2.8 TUNING

#ENTER TUNING MODE

Select "FM Radio" in main menu and press

button to listen to radio. #EXIT TUNING MODE

When listening to radio, press button for long to return to main menu. #PRESET/SCAN MODE SWITCH

When listening to radio, press button to switch between PRESET and SCAN mode.

PRESS

1. PRESET mode #ADJUST CHANNEL

Press button to enter the next channel, and press button to enter the previous channel.

#FULL AUTO SCANNING

In PRESET mode, press button for long to begin full auto scanning. All scanned radio stations will be saved in PRESET channel automatically.

PRESS FOR LONG

2. SCAN MODE #MANUAL/AUTOMANUAL SCANNING

Press button to increase 0.1MHz each time; and press button to decrease 0.1 Mhz each time. Press button to save radio station.

Press button for long to increase frequency continuously and stop until radio station has been searched. Press button to save radio station.

Press button for long to decrease frequency continuously and stop until radio station has been searched. Press button to save radio station. #SAVE RADIO STATION

Select channel in PRESET mode firstly, and then switch to SCAN mode to adjust fre quency (manually or auto manually). After scanning desired frequency.

press button to save into the current

PRESET channel.

PRESS

CAUTION: In the course of full auto/automanual

scanning, press or button to stop

scanning.

#FM RECORDING

When listening to radio , press button for long to enter FM recording . Press button for long to stop recording and generate into recording file.The generated file of FM recording is wav format.

PRESS FOR LONG

2.3 SETTINGS

2.3.1 SETTINGS

#Play Mode Normal Shuffle Playlist Intro REP One REP ALL REP DIR #EQ Select Normal PURE POP Clas Jazz Rock Dbass Disco My EQ #Sleep Disable~120Min

2.3.2 PLAY MODE

PRESS

#Playlist Browse Edit Delete #FM Channel Auto Mono #Lock Setup Lock Disable Lock Enable #Screen Save Disable~5Min #Advanced My EQ REC Set Format Load Default System Info Language

PRESS

- 8 -

The playback symbol displays on playback

interface is shown as follows:

play according to track sequence. random play any one track. play the track edited in program list. browse play each track for 10 seconds. repeat play single track. repeat play all tracks. repeat play all tracks in this Folder.

CAUTION:

#Play mode is defaulted to "Normal" each time

when power on.

#Files in "My Voice" only support sequence

playback.

#When playing files in "My Voice", there is no

"Play mode" item.

2.3.3 EQ SELECT

Press button to enter "EQ SELECT",

and then use to move cursor, shown

as follows:

PRESS

The corresponding icons of each EQ mode

in playback mode are shown as follows:

NORMAL PURE

POP

CLAS JAZZ ROCK

DBASS DISCO

My EQ

Select "MY EQ", and correspond with the sound effect that you have preset in "MAIN MENU->SYSTEM SETUP->ADVANCED". If you have not set it, it defaults "MY EQ" to NORMAL" sound effect.

When the cursor moves to a certain sound effect mode, the sound effect mode played by MP3 player will switch to that in the cursor for the moment to facilitate you to select your desired sound effect mode. Press button to confirm this sound effect mode.

CAUTION:

When playing files in "REC", there is no”EQ SELECT" item.

2.3.4 SLEEP

Press or button to adjust the timing power-off time. After setup finishes, press

button to save and then exit, and press button not to save and then exit. If timing power off time is 15 minutes, after 15 minutes, MP3 PLAYER will power off automatically.

PRESS

CAUTION:

#It is defaulted to be invalid each time when

power on.

#Timing power-on time is a rough time, and may

have difference.

2.3.5 PLAYLIST

Select "Browse" , and you may check how many songs have been program-med into playlist. When browsing play list. Pressing button may begin playing.

PRESS

Note: Playback will be paused when in "Browse" or "Edit list".

#Edit

PRESS PRESS PRESS

As in the above illustration, enter "Edit" and browse files.The icon before songs in the playlist is " ". Select a song not in the playlist and press button to add it intothe list. Select a song in the playlist ,and press button to cancel it from the playlist

You can add 15 songs into the playlist at most. #Delete

Select "Delete". After dialogue box pops up, select "YES", and press button to confirm and the playlist is cleared.

PRESS

NOTE: #If the operation of adding or cancelling music

files is detected, MP3 PLAYER will clear the playlist automatically.

#You cannot enter "Edit list" and "Clear list"

when in program playback.

2.3.6 FM CHANNEL

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

PRESS

2.3.7 LOCK SETUP

Entering this menu may open or close auto buttons lock function.

- 9 -

If “Lock Enable” is selected and not any button is operated during 30 seconds, all button functions will be locked automatically.

Three kinds of recording quality adopt IMA-

ADPCM format coding.

PRESS

CAUTION:

Lock is only effective in playback, recording and tuning modes.

2.3.8 SCREEN SAVE

Press or button to adjust the screen saver time. After setup finishes, press button to save and then exit, and press button not to save and then exit. If the screen saver setup time is 3 minutes and no operation occurs within 3 minutes, MP3 PLAYER will enter screen saver state automatically.

PRESS

2.3.9 ADVANCED

Advanced items include some other system internal setup, such as user sound effect setup, default setup and system information.

PRESS

2.3.10 ADVANCED

#My EQ

In "My EQ" interface, you may see the decibel (dB) of each frequency.

#Formatting

Enter this menu, and you may format hard

disk. When dialogue box pops up, press

button to move cursor to “YES”, and then press button to confirm to finish formatting operation.

PRESS

#Default

PRESS

If you want to restore MP3 PLAYER to factory setup state (data and song files cannot be cancelled), you may select “Load Default”. After dialogue box pops up, select “YES” , press button to confirm and then exit to restore to default state. Select “NO” or press button to cancel.

CAUTION:

Restore to "Default" state is effective only when power on again.

#System Info

You may find information of firmware version, total disc capacity and left disc capacity. In system information menu, press button to return to the previous menu.

PRESS

If you want to adjust the decibel of mediant (1k HZ), operate according to the below illustration.

PRESS

When adjusting width, take 3dB as a step and the max adjustable range is 15dB. After setup finishes, press button to confirm and exit, and press button to exit with the original setup not being changed. #REC Set

Here to set the recording quality ,The recording quality is higher, the sound quality is better and the used space is more.

CAUTION:

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

#Languages

Russian and English are supported.

PRESS

#Upgrade

Download the latest firmware upgrading file from BBK website firstly, such as "BBK_X23RU. ebn" and "X23RU_Resource.bin", copy the two files into MP3 PLAYER at the same time, and then power on again.

- 10 -

Find "Upgrade" item in "ADVANCED" of

Model

Audio decode chip

Continuous playback time

Dimensions/weight

Audio SNR

Theadphone ou

Frequency range

FM tuning range

Working temperature

Files supported

90dB

The longest time is about 15 hours

80.2mm 28.5mm 14.5mm about 28.5g(without battery),40g(with battery)

X23

Philips PNX0101

9mW+9mW 32ohm impedance )

18Hz 20kHz

MPEG 1/2 Layer 3(16kbps 320kbps) WMA (8kbps 192kbps) WAV

87.5MHz 108MHz

0 40 C

"SETTINGS", and pressing button may start upgrading. After upgrading finishes, MP3 PLAYER will power on again.

PRESS

NOTE:

#Only Mp3 player detects that there is upgrading

file in system when this player power on, “Upgrade" menu will appear in "ADVANCED" item.

2.4 SPECIFICATION

#Make sure Mp3 PLAYER has enough quantity

of electric charge before upgrading.

#To ensure successful firmware upgrading, do

not power off during the course of upgrading.

#Upgrading will last for 10 seconds or more,

please try your best not to operate other buttons during this course.

#After firmware upgrading finishes, some

function or interface may probably be different from user manual, so please take real object as standard.

- 11 -

Chapter Three Servicing and Principle

Section One Principle of the Player

3.1.1

1. Mp3 main decode chip, which adopts professional MP3 decode chip PNX0101 of Philips

company, with integrated ARM and DSP core inside. Sound quality is good and power consumption is

low.

2. USB jack circuit: USB jack, data exchange.

3. Flash circuit: data storage of the player.

4. OLED circuit: display of working state of the player.

5. MIC circuit: external audio input, record function finishes.

Function introduction

3.1.2 Block diagram of the player

Block diagram of the player is shown in the figure 3.1.2.1:

32.768K

CRASTAL

HEADPHONES

ANTI-POP CIRCUIT

IMPEDANCE MATCH

FM MODULE

LDO MODULE

3.0V VOLTAGE

2.8V VOLTAGE

1.8V VOLTAGE

MICROPHONE

USB INTERFACE

3V-12V DC-DC

CONVERTER

PNX 0101

OLED MODULE

Figure 3.1.2.1 block diagram

NAND

FLASH MEMORY

- 12 -

ONE AAA SIZE

DC-DC

INTERNAL

CONVERTER

BATTERY

BUTTON ARRAY

RESET CIRCUIT

12M CRYSTAL

3.1.3 Introduction to IC of the player

Location IC model Function

U1 PNX0101ET MP3 decode

U2 K9F4G08U0M Flas h

U3 TCM809ZVBN713 Reset IC

U4 TPS793285DBVR Precision voltage stabilizer

U5 SI1912 Dual MOS tube

U6 LM2703 12V boos t

FU1 TEA5767HN TuningIC

Introduction to IC of the player is shown as in the following table:

- 13 -

Section Two Unit Circuit Principle

3.2.1 FLASH circuit

1. FLASH circuit schematic diagram is shown in the figure 3.2.1.1:

K9F2G08U0M-YCBO TSOP

NC NC NC NC NC GND RY/BY RE CE NC NC Vcc Vss NC NC CLE ALE WE WP NC NC NC NC NC

NC NC NC

NC I/O8 I/O7 I/O6 I/O5

Vcc Vss

NC I/O4 I/O3 I/O2 I/O1

48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25

MPMC_AD7 MPMC_AD6 MPMC_AD5 MPMC_AD4

MPMC_AD3 MPMC_AD2 MPMC_AD1 MPMC_AD0

VCC33

L13 601

R16 100K

FLASH3V3

C48

104 X5R

D_GND

R17

100K

1 2 3 4 5 6

/CE

/WP

7 8

9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

/RE

D_GND D_GND

CLE ALE /WE

D_GND

FLASH3V3

C19

104 X5R

D_GND

Figure 3.2.1.1 Flash circuit schematic diagram

2. Working principle: Flash Memory is the storage unit of the player, all Mp3 and waveform files

should be stored in FLASH. Flash module is composed of FLASH chip TC58512FT and peripheral circuit

to finish internal files’s working of read, write and delete. 1.5V battery voltage, through PNX0101 internal

boosted circuit, provides 3.3V voltage for working of FLASH. R16 is pull up resistor of /CE, R17 is the

pull down resistor of /WP, Vcc is power supply pin of FLASH, /CE is chip selection signal, high level is

effective, VCC33 provides 3.3V voltage and FLASH begins to work. /RE, /WE are read effective and

write effective signal end respectively to control read and write function of FLASH. I/O1 - I/O8 are 8 data

lines to complete the exchange of FLASH and external data to realize functions of write, delete and edit

of Mp3.

- 14 -

When Mp3 is powered on, 3.3V voltage supplies power for Flash through Vcc, /CE inputs 3.3V high

level signal and Flash begins to work effectively. When Mp3 laying music, /RE is high level, Flash

performs read operation. When writing files in through data line o recording through microphone, /WE is

high level, Flash performs write in operation. Working of read out and write in are performed through

I/O1 I/O8 8 data/address lines.

3.2.2 FM tuning circuit

1. FM tuning circuit diagram is shown in the figure 3.2.2.1;

102

C18

N.C

IFGAI

AGND AVCC

RFI1

RFGND

RFI2

TCAGC

LOOPSW

N.C

CPOP2VCOT13VCOT24VCOVCC5DGND6DVCC7DATA8CLOCK9N.C

SGND

FM_OUTL

FM_OUTR

C12 333

FM_OUTL

FM_OUTR

N.C

LAVO

MPXO25VREF

DIFL128DIFL2

RAVO

TCIFC

TMUTE

NECTAR-I

TEA5767HN

N.C

PHLF

PDLF

XTAL2

XTAL1

SWP2

SWP1

BUSEN

BUSM

W/R

C17

223

C16

33K

C14

223

SGND SGND SGND

C15

22PF

102

D-GND D-GND

XT1

CRYSTAL

32.768KHz

FM_3V3

D-GND

IIC_SDA 2

IIC_SCL 2

SGND

C6 473

C7 473

10R

FM_3V3

475/X5R/0603

472

SGND

C8 473

C9 333

SGND

R2 18K1%

31 32 33 34 35 36 37 38 39 40

C10

SGND

C2 27PF

101

FM_ANT

FM_ANT3

47PF

120nH/2%

FM_3V3

10K

33nH2%

393

100K

D-GND

C19

103

C11

33nH2%

C13

BB202

FM_3V3

SGND

dandu

22R

BB202

22R

104/X5R/0402

D-GND

Figure 3.2.2.1 FM tuning circuit diagram

- 15 -

2. Working principle: tuning circuit is composed of micro digital tuning IC TEA5767HN of Philips

company and peri

pheral circuit. Power supply voltage is supplied by PQ1X28 to provide pure voltage

with value 2.8V for IC. FC1, FC2, FC3, FC4 and Fl1 are antenna input matched circuit of FM module;

variable diode Fd1, Fd2 and winding inductor is tuning circuit in FM module. Control of FM adopts IIC

bus control means, 8, 9 of TEA5767 are data line and control line.

When MP3 player switches to FM tuning state, pin 13 BUSEN of TEA5767HN receives high level

signal, bus control mode is gated, IC begins to work. As antenna, headphone receives FM signals from

nature, through antenna input matching circuit, input TEA5767HN, PNX0101 via RFI1 and RFI2 to

control TEA5767HN to perform intermediate frequency and selected frequency control through IIC_SCL

and IIC_SDA to transform FM signals to sound simulating signals and then is outputted by FM_OUTR

and FM_OUTL to ADC circuit of PNX0101 and then output through headphone after DAC processing.

3.2.3 OLED module circuit

1. OLED module circuit is shown in the figure 3.2.3.1:

GND

CN5

1 2

BS2 BS1

IREF VCOMH VOLED

R43 4.7K R44 4.7K

LCD_CS 1 LCD_RESET 1 LCD_D/C 1 LCD_WR 1 LCD_RD 1 LCD_DB0 1 LCD_DB1 1 LCD_DB2 1 LCD_DB3 1 LCD_DB4 1 LCD_DB5 1 LCD_DB6 1 LCD_DB7 1

3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

LCD_3V3

VOLED1

MBR0520/SOD123

L22 601

L25

CR32NP-10uH

LCD_3V3VCC33

VCC33

L14 601

CON20

C55

104/16V

R47 2M

D_GND

C62

106/25V/1206

C65 22P

R53 27K1%

D_GND

L23

R49 240K1%

Lm2703

VIN

C18

104

100K

C54

475/X5R/6.3V

GND

Figure 3.2.3.1 OLED circuit schematic diagram

2. Working principle: 12V high voltage is required to lighten OLED and matching circuit must be

matched to finish. The circuit includes two parts: boosted circuit and OLED jack circuit, in which boosted

circuit is constituted by boosted DC-DC LM2703 and peripheral circuit, VIN is power input, EN is

Lm2703 enable end, high level is effective, SW is high voltage output pin, FB is feedback pin, voltage

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Value VOLED outputted by high voltage is achieved through selecting two voltage partial resistor on two

ends of FB, and the following relation is met:

Seen from the above, VOLED is about 12.2V. L25, C62 in circuit are energy storage inductor and

output capacitor of boosted circuit.

3.3V voltage inputs LM2703 through Vin, EN receives the high level through current limit by R1 to

make LM2703 effective, 3.3V voltage is outputted by SW pin through LM2703 voltage rise, output to pin

20 of OLED through voltage stabilizing pipe D4 to provide lighting voltage for OLED. During the course

of working, FB feedback to LM2703 through detecting energy storage capacitor C65, output voltage

may be controlled through adjusting resistor R49 and R53.

OLED jack circuit is connected with OLED of PNX0101 directly, through data exchange of

LED_DB0 LED_DB7 and PNX0101, character display is controlled by internal program of PNX0101.

Pin 6 of OLED is reset signal and controlled by one MPMC jack of PNX0101. When power on, high

level outputs and OLED resets.

3.2.4 USB jack circuit

1. USB jack circuit is shown in the figure 3.2.4.1:

USB1

GND

D+

D-

VB+

SFI0402-050E100NP

C60

GND

Q1 SS8550LT

R3 1K

GND

USB_VBUS

R59 100K

USB-VBUS

R77

180K

GND

USB_DET 1

SFI0402-050E100NP

C69

104 X5R

Figure 3.2.4.1 USB jack circuit schematic diagram

2. Working principle: USB jack network is composed of VB+ (USB 5V power), D+ (positive data line),

D- (negative data line) and GND (ground line), in which PNP triode Q1 is used for inverse insert

protection to prevent damaging Mp3 internal circuit because of inverse insert.

D with USB control module of PNX0101 directly. When Mp3 is connected with computer, VB+ high

DM DP

SFI0402-050E100NP

D_GND

R5 18R R7 18R

USB_DP 1 USB_DM1

level of computer USB jack inputs to USB_DET of PNX0101, USB jack is effective, USB jack connects

with PNX0101 through D+ (USB_DP) and D- (USB_DM), then connected with Flash by PNX to realize

information exchange of Flash internal data and computer internal data.

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3.2.5 Buttons circuit

1. Buttons circuit is shown in the figure 3.2.5.1:

VCC33

VOL-

D_GND

DFU

R9 47K

R6 1K

SS8550LT

R4 0R

C14

SFI0402-050E100NP

D_GND

C11

104 X5R

D_GND

R8 51K

Figure 3.2.5.1 Buttons circuit schematic diagram

D_GND

R15 1k

VCC33

D_GND

R10 1K

C12

104 X5R

R14 1K

D_GND

C13

SFI0402-050E100NP

VOL+

D_GND

KEY_SCAN_1 2

VCC33

C66

104 X5R

D_GND

R13 1K

C15

SFI0402-050E100NP

KEY_SCAN_2 2

2. Working principle: buttons of X23 (RU) are composed of 6 single buttons (one is OPEN/CLOSE

and PLAY button, which will be introduced in power on/off circuit). Button detect is to use partial voltage

mode to utilize ADC circuit of PNX0101 to check preset button voltage value to decide which button

functions. When the relevant button is pressed, voltage value of preset point corresponding to this

button will have change, voltage inputs ADC circuit of PNX0101, then the internal program makes the

relevant response to realize function of each button. To lock button.

3.2.6 Headphone jack circuit

1. Headphone jack circuit is shown in the figure 3.2.6.1:

R79

47K

Si1912DL SOT-363/NT4401

R78

104 X5R

4.7K

R501KR51

PHONE_MUTE 1

HP_VOUTL 1

HP_VOUTR 1

1 3 4

2SJ-A382-001(HP-DC)

CN1

FM_ANT

OUT_R

162

GND

601 DCR<350m

L17

OUT_L

601 DCR<350m

L15

601 DCR<350m

L16

RCLAMP0504F/SC-706L

GND

Figure 3.2.6.1 Headphone jack circuit schematic diagram

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