BBK X21 Service Manual

X21(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 INSTALL USB DRIVE PROGRAM

2.2.3 USE MOBILE STORAGE FUNCTION

2.2.4 DISCONNECT USB SAFELY

2.2.5 BROWSE/CANCEL FILE

2.2.6 PLAY MUSIC

2.2.7 PLAY MUSIC

2.2.8 A-B REPEAT FUNCTION

2.2.9 RECORDING

2.2.10 TUNING

2.2.11 TUNING

2.2.12 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 3D

2.3.6 PLAYLIST

2.3.7 PLAYLIST

2.3.8 FM CHANNEL

2.3.9 SCREEN SAVE

2.3.10 ADVANCED

2.4 SPECIFICATION

Chapter Three Principle and Servicing

section One Principle of the Player

3.1.1 Function introduction and principle of the player

3.1.2 Block diagram

3.1.3 Introduction to IC used by the player

Section Two Unit Circuit Principle

3.2.1 FLASH circuit principle

3.2.2 FM module circuit

3.2.3 OLED module circuit

3.2.4 USB jack circuit

3.2.5 Button circuit

3.2.6 Charge management circuit

3.2.7 Low voltage detecting circuit

3.2.8 Battery protection circuit

3.2.9 Power management module

3.2.10 Headphone jack circuit

3.2.11 Reset circuit

3.2.12 ON/OFF control circuit

3.2.13 MIC circuit

Section Three Servicing Cases

3.3.1 Servicing cases

3.3.2 Troubleshooting flow chart

Section Four Servicing Parameters

3.4.1 Key point waveform diagram

3.4.2 Key point voltage list

Section Five Function Introduction to IC

3.5.1 Function introduction to PNX0101

3.5.2 Function introduction to G690

3.5.3 Function introduction to PQ1X281

3.5.4 Function introduction to TC58512FT

3.5.5 Function introduction to SI1912DL

3.5.6 Function introduction to LM2703

3.5.7 TPS79301

3.5.8 Function introduction to TPS62200

3.5.9 Function introduction to ISL6294

3.5.10 Function introduction to S80829

3.5.11 Function introduction to TEA5767HN

Chapter Four Disassembly and Assembly Process

4.1 Whole set

4.1.1 Disassembly process of the whole set

4.1.2 Assembly process of the whole set

4.2 OLED display screen

4.2.1 OLED disassembly process

4.2.2 OLED assembly process

4.3 Li battery

4.3.1 Li battery disassembly process

4.3.2 Li battery assembly process

4.4 FM tuning board

4.4.1 FM tuning board disassembly process

4.4.2 FM tuning board assembly process

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 PNX0101audio decode chip

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

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

# Sennheiser headphone MX400) Build high-quality musical effect. # Support 3D surround stereo sound effect, 9 EQ modes

LifeVibes

You may taste heart quaking bass and vivid surround stereo sound effect. # 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 function Auto scanning and auto/manual memory function may listen to FM radio station programs

more easily.And you may record FM program into WAV files directly.

# 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

1.1

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

1.3

1.1

1.2

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

- 4 -

1.3

1.2

HOLD button: Push towards arrow to lock buttons; and push toward the opposite direction to

# Press in playback mode # Press for long in playback mode # Press in tuning Preset mode # Press in tuning SCAN mode # Press for long in tuning Preset mode # Press for long in tuning SCAN mode # Menu mode # Press in power-off mode # Press for long in power-on mode # Press in playback mode # Press in recording mode # Press in tuning mode # Press in menu mode

# Press for long in menu mode # Press in playback mode # Press for long when playing music file (non recording file) # Press in browsing file mode # Press for long in tuning mode # Press in Play and tune mode # Press in

the next/previous track fast forward/backward select channel manual scanning full auto scanning automanual scanning move cursor or set item power on power off pause playing pause recording pause (mute) enter the selected item or confirm the setup enter recording mode A-B repeat switch sound effect delete file Start FM recording adjust volume adjust dB value

unlock.

Headphone jack

USB jack

2.1.3 MAIN MENU ILLUSTRATION

# 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 last time.

2.1.4 PLAYING INTERFACE ILLUSTRATION

Play State

Sound effect mode

Playback mode

Repeat state

Battery capacity

Song name and Singer

# REC Select "REC"to enter recording mode # FM Radio Select " FM Radio"to enter radio mode. # System Setup Select " System Setup" to set system items. # System Setup Select " System Setup" to set system items.

Time that has been played

Number of tracks

Spectrum display

- 5 -

2.1.5 TUNING INTERFACE

ILLUSTRATION

PRESET mode (normal receiving)

Frequency of the current radio station

Battery capacity

Frequency bar

PRESET channel display

SCAN mode (scanning)

2.1.6 RECORDING INTERFACE

ILLUSTRATION

You only need to find the drive nformation file

on disc according to prompt information to finish the installation of drive program.

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

Shown as the following figure:

2.2.2 INSTALL USB DRIVE

PROGRAM

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 will

automatically indicate that new firmware device has been found, and run the installation guide, shown as the following figure.

2.2.3 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 comer 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 use USB transmission line to connect Mp3 PLAYER, then connect computer.

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

2.2.4 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.

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2.2.5 BROWSE/CANCEL FILE

# BROWSE FILE

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 .

PRESS FOR LONG

# CANCEL FILE

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" to exit.

PRESS

PRESS FOR LONG

CAUTION:

Fast forward and fast backward operation are only for the current track. After fast backward/forward to the beginning/ending of track, it switches into normal playback automatically.

2.2.8 PLAY MUSIC

When playing or tuning, pressing button or for long may adjust volume. The display of adjusting volume in music playback interface is shown as follows:

PRESS

2.2.6 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.

PRESS

# 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.

2.2.7 PLAY MUSIC

# FF and FB

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

PRESS FOR LONG

CAUTION:

# Music playback will be paused when browsing

file.

# In some operating system (such as complex

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 , 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.

2.2.9 A-B REPEAT FUNCTION

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

PRESS PRESS PRESS

2.2.10 RECORDING

When recording, press button to pause and press button for long to exit recording and then make files.

When playing, pressing button for long

may realize fast backward.

- 7 -

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

buttons and the sound of pressing may probably be recorded.

2.2.11 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

PRESS

2.2.13 TUNING

# SAVE RADIO STATION

Select channel in Preset mode firstly, and then switch to SCAN mode to adjust frequency (manually or automanually). After scanning desired frequency, press buttonto save into the current PRESET channel.

PRESS

CAUTION:

In the course of full auto/automanual

scanning, press or button to stop

scanning. # FM RECORDING

In tuning mode, press button for long to

enter FM recording. Press button to stop recording and make recording fil . FM recording makes WAV format file.

1. PRESET mode # ADJUST CHANNEL

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

2.2.12 TUNING

FULL AUTO SCANNING

PRESS FOR LONG

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

2. SCAN MODE # MANUAL/AUTOMANUAL SCANNING

Press button to increase 0.1MHz each time; and press button to decrease 0.1MHz 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.

2.3 SETTINGS

2.3.1 SETTINGS

# Play Mode

Normal Shuffle Playlist Intro REP One REP ALL REP DIR

# EQ Select

Normal 3D PURE POP Clas Jazz Rock Dbass

Disco

My EQ

# Sleep

Disable120Min # 3D Setup

BassBoost ConcertSound

# Playlist

Browse Edit Delete

# FM Channel

Auto Mono

# Screen Save

Disable - 5Min

- 8 -

# Advanced

My EQ REC Set Format Load Default System Info Language

2.3.2 PLAY MODE

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:

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 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.

CAUTION: # It is defaulted to be invalid each time when

power on.

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

have difference.

PRESS

2.3.5 3D

In this menu, "3D “ may be adjusted. BassBoost can strengthen bass effect; and concert can build classical sound field effect. At the same time of confirming clearness, strengthen hearing feeling. Through adjustment, you may feel live and vivid sound field effect no matter where you are.

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 "3D", and correspond with 3D that you have preset in "MAIN MENU->SYSTEM SETUP->3D SETUP. If you have not set it, it is default value.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

PRESS

2.3.6 PLAYLIST

# Browse

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

PRESS

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

PRESS PRESS PRESS

- 9 -

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

2.3.7 PLAYLIST

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.

2.3.8 FM CHANNEL

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

PRESS

“My EQ" interface, you may see the decibel

(dB) of each frequency.

PRESS

If you want to adjust the decibel of mediant (1kHz), 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. Three kinds of recording quality adopt IMA-ADPCM format coding.

PRESS

# Format

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.

2.3.9 SCREEN SAVE

Press 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

2.3.10 ADVANCED

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

PRESS

# My EQ

PRESS

# Load 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:

Estore 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.

- 10 -

In system information menu, press button to

Model X21

Audio dicode chip Philips PNX0101

Continuous playback time The longest time is about 10 hours

Dimensions/weight 57mm×45mm×14mm about 30.7g

Audio SNR

90dB

Headphone out 9mW+9mW(32ohm im pedance)

Frequency range 18Hz~20kHz

FM tuning rang 87.5MHz~108MHz

Working temperature

0~40

Files supported MPEG 1/2 Layer 3(16kbps~320kbps),WMA(8kbps~192kbps),WAV

return to the previous menu.

CAUTION:

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

Russian and English are supported.

PRESS

# Upgrade

Download the latest firmware upgrading file from BBK website firstly, such as "BBK X21RU. ebn" and "X21RU_Resource.bin", copy the two files into MP3 PLAYER at the same time, and then power on again. Find "Upgrade" item in "ADVANCED" of "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.

# 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 about 10 seconds or more,

please try your best not to operate any 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.

2.4 SPECIFICATION

- 11 -

Chapter Three Principle and Servicing

section One Principle of the Player

3.1.1 Function introduction and principle of the player

X21 (RU) portable MP3 player is composed of the following functional modules:

# MP3 main decode chip: main chip adopts PNX0101 decode chip of Philips Company, PNX0101 is

the professional MP3 decode IC of Philips Company, with ARM and DSP integrated inside. The

advantages are good sound quality and low power consumption.

# Power management module: composed of TPS79301, TPS62200 and PQ1X28 and responsible

for the power supply of each part of MP3.

# USB module: USB jack, data exchange, and charge function.

# Lithium battery module: power supply of the player.

# Memory module: data storage of the player.

# OLED module: display of the working state of the player.

# Headphone output: audio output.

# MIC: external audio input, which fulfills recording function.

# Tuningmodle: FM tuning.

3.1.2 Block diagram

Block diagram is shown in the figure 3.2.1.1:

USB jack

module

management

USB power

Charger power

Low voltage detect

Charge management

ISL6294

S80821

Power

TPS79301

TPS62200

3.6V~4.2V

Lithium battery module

LDO

DC-DC

LDO

PQ1X28

G690L263T

12M crystal oscillator

Reset IC

3.3V

1.8V

2.8V

OLED module

PNX0101

MIC

12.1V

DC-DC

LMS2703

Button and switch control circuit

Headphone output

FLASH

Figure 3.1.2.1 Block diagram of X21 (RU)

- 12 -

MEMORY

FM module

TEA5767

3.1.3 Introduction to IC used by the player

PCB board Location IC model Function

U1 TPS79301 Provide 3.3V voltage

U2 G690L263T System reset

U3 TPS62200 Provide 1.8V voltage

U4 ISL6294 Charge management

U5 S80829 Low voltage detect

U6 Philips PNX0101 MP3 decode

U7 PQ1X28 Provide 2.8V voltage

U8 TC58512FT Flash Memory

U9 SI912DL Headphone mute

Tuning board

U1 TEA5767HN Tuning module

Mian board

Introduction to IC used by X21 (RU ) is shown in the following figure:

- 13 -

Section Two Unit Circuit Principle

3.2.1 FLASH circuit principle

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

FLASH3V3

TC58512FT

100K

/RE /CE

CLE ALE /WE /WP

GND

RY/BY

104

D_GND D_GND

R2 100K

FLASH3V3

Vcc

Vss

CLE

ALE

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

FLASH3V3

MPMC_AD3 MPMC_AD2 MPMC_AD1 MPMC_AD0

104

D_GND

Figure 3.2.1.1 Flash circuit schematic diagram

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

must be saved in FLASH. Flash module is composed of FLASH chip TC58512FT and peripheral circuit,

which fulfills the read, write and cancel working of internal files. In whic

h, 601 magnetic L15, 104

capacitor C45 and C46 compose FLASH power filtering circuit and provide FLASH with pure 3.3V

voltage. R38 is p

ull-up resistor of /CE, R40 is pull-down resistor of /WP, Vcc is power supply pin of

FLASH, /CE is chip selection signal, VCC33 provides 3.3V voltage and FLASH begins to work. /RE, /WE

are effective read and effective write signal end respectively to control read and write function of FLASH.

I/O1 I/O8 is 8 data lines to fulfill the exchanges of FLASH and external data.

3.2.2 FM module circuit

1. FM module circuit schematic diagram is shown in the figure 3.2.2.1:

2. Working principle: FM module is composed of microwave digital tuning IC TEA5767HN produced

by Philips Company and the peripheral circuit, in which, L17, C54, C55 is the power supply filtering

circuit of FM module that provides IC with the pure voltage with typical value 2.8V. Cn1 is the socket

between FM module and main board.

- 14 -

C1, C2, C3, C4, L1 is the antenna input matching circuit of FM module; variable capacitance diode

D1, D2 and winding inductor is the frequence selection tuning circuit in FM module. The control of FM

adopts IIC bus control means, 9 and 10 of TEA5767 are two control input ends.

SGND

C6 473

C7 473

10R

FM_3V3

475/X5R/0603

472

SGND

FM_OUTL

C8 473

C9 333

SGND

R2 18K 1%

31 32 33 34 35 36 37 38 39 40

N.C

IFGAI

AGND

AVCC

RFI1

RFGND

RFI2

TCAGC

LOOPSW

N.C

CPOP2VCOT13VCOT24VCOVCC5DGND6DVCC7DATA8CLOCK9N.C

DIFL128DIFL2

FM_OUTR

C12 333

FM_OUTL

FM_OUTR

N.C

LAVO

MPXO25VREF

RAVO

TCIFC

TMUTE

NECTAR-IO603CS

TEA5767HN

N.C

PHLF

PDLF

XTAL2

XTAL1

SWP2

SWP1

BUSEN

BUSM

W/R

33K

C14

102

C18

C17

223

C16

223

SGND SGND SGND

C15

22PF

102

D-GND D-GND

XT1

32.768KHz

FM_3V3

D-GND

IIC_SDA 2

IIC_SCL 2

C10

SGND

C2 27PF

C1 101

FM_ANT

FM_ANT3

47PF

120nH/ 2%

FM_3V3

10K

393

100K

D-GND

C19

104/X5R/0402

BB202

C11 103

33nH 2%

O603CS

22R

BB202

33nH 2%

SGND

C13

104/X5R/0402

dandu

FM_3V3

22R

D-GND

Figure 3.2.2.1 FM module circuit schematic diagram

- 15 -

3.2.3 OLED module circuit

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

CN4

NC1VCOMH

VCC

IREF

D66D48D2

VDD

D/C#

WR#

RES#16RD#

BS2

CS#17GND21BS1

C71

475/X5R/6.3V

P_VDD

L24

601

VCC33

R71 100K

EN1

CDRH3D16-4R7

R73

L25

VIN

GND

U10

TPS61040/LM2703

MBR0520/SOD123

240K 1%

R70

27K 1%

VOLED

C68

22P

L26

GND

Figure 3.2.3.1 OLED circuit schematic diagram

C65

16V/104

C72

106/25V/1206

C63

103

VOLED

R65

LCD_DB72LCD_DB3

LCD_DB62LCD_DB5

R63

R64

4.7K

GND

C67

LCD_DB12LCD_DB4

LCD_DB2

R74 0R*R75

LCD_WR

LCD_D/C2LCD_DB0

LCD_CS

LCD_RD

/RESET

104

LCD_3V3

R72 0R

_RESET

2. Working principle: for 12V high voltage is required to lighten OLED, boosted circuit must be used

togther to fulfill it and the circuit includes two parts: boosted circuit and OLED jack circuit. In which,

boosted circuit is composed of boosted DC-DC LM2703 and peripheral circuit, VIN is power input, EN is

the enable end of LM2703, high level is effective, SW is high voltage output pin, FB is feedback pin, the

voltage value VOLED outputted by high voltage is achieved through selection the two divider resistance

and they satisfy the following relationship:

Seen from the above, VOLED is about, 12.2V. L25, C72 in circuit are energy storage inductor and

output capacitor of boosted circuit.

OLED jack circuit is connected with OLED jack of PNX0101 directly, the internal program of

PNX0101 controls the characters display of OLED, working state information of the player is displayed

through OLED to fulfill man-machine communication.

- 16 -

3.2.4 USB jack circuit

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

USB1

3DU05S-32T-10

Shield Shield

GND

VB+

6 5 4 3

D+

D-

362

GND

L18

GND

R44 1K

680 DCR<100m

SS8550LT

RC LAMP0504FC

USB_VBUS 2

R47 100K

R42 18R

R43 18R

USB_DET 1

SDCW2012-2-900T

USB_DP 2

USB_DM2

180K

R49

C56 104

Figure 3.2.4.1 USB jack circuit schematic diagram

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

D -( cathode data line) and GND (ground line). In the circuit, PNP triode Q8 is reverse insert protection

function to prevent the damage of Mp3 internal circuit because of reverse insert; D5 is TVS diode array

used for anti - static.

3.2.5 Button circuit

1. Button circuit schematic diagram is shown in the figure 3.2.5.1:

R55 300R

D_GND

R56 220R

VCC33

D_GND

R54 1K

C57 104

A-B/REC

KEY_SCAN_2 2

C58 SFI0402-050E100NP

R68 750R

VOL- C70

D_GNDD_GND D_GND

R69 510R

VOL+

VCC33

R67

D_GND

SFI0402-050E100NP

C69 104

KEY_SCAN_1 2

Figure 3.2.5.1 Button circuit sche0matic diagram

2. Working principle: buttons of X21 (RU) include a 3-direction button, a HOLD switch and 4 single

buttons (in which one is ON/OFF and PLAY button and will be introduced in ON/OFF circuit). Button

detection uses partial voltage mode, which utilizes ADC circuit of PNX0101 to check voltage value of the

preset button to determine which button functions, then make the corresponding reaction by internal

program to fulfill function of each button.

To lock button, directly use a IO port of PNX0101 to detect high and low level. When high level is

detected, lock is determined, other buttons do not function. C58, C70 and C73 are voltage dependent

resistor to prevent ESD.

- 17 -

3.2.6 Charge management circuit

1. Charge management circuit mainly charges lithium-ion battery and the circuit schematic diagram

is shown in the figure 3.2.6.1:

USB_VBUS

/STATUS

VCC33

R16 47K

C12

105/X5R

P_GND

U4 ISL6294

PPR

CHG EN4GND

I_SET

BAT

IREF

IMIN

P_GND

R25 10K

8 7 6

R20

510K 1%

P_GND

R21

120K 1%

R26

100K

BAT

R22

120K 1%

SS8050LT

P_GND

3.2.6.1 Charge management circuit schematic diagram

2. Working principle: seen from the circuit, charge circuit is mainly fulfilled by charge control IC

ISL6294 and peripheral circuit. IN pin is power input pin of ISL6294, that is the input end of USB 5V, BAT

is output pin of ISL6294, that is the input end of lithium battery; /CHG is charge state indication end,

when /CHG is in low level, it means the charge is in process, on the contrary it means the charge is

finished; IMIN is minimum charge current setup end, that is, when charge current is less than the

current value set by this end, charge is stopped. The setup of minimum charge current is fulfilled through

selecting external resistor R20. The relationship between Minimum charge current IMIN and R20 is

shown as follows:

(MA)

Seen from the above, minimum charge current is about 20 milliampere.

IREF is setup end of charge current, ISL6294 uses this reference current to charge lithium battery.

The relationship between charge current I and resistor connected externally:

REF

Triode Q6 in circuit is used for charge current selection. When users use computer to charge battery,

PNX0101 outputs I_SET, which is low level, Q6 cuts off, and R21 is connected into circuit. Seen from the

above, I is about 100 milliampere; when users use charger to charge battery, PNX0101 outputs I_SET,

EFR

which is high level, Q6 is Saturated on, R21 and R22 are connected into circuit in parallel, seen from the

- 18 -

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