BBK X31 Service Manual

X31(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

1

1

1

1

1

1

2

2

2

2

2

2

3

4

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

2.2 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

4

4

4

5

5

6

6

6

6

6

7

7

7

7

2.3 SETTINGS

8

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

2.4 SPECIFICATION

Chapter Three Servicing and Principle

section One Principle of the Player

3.1.1 Function introduction

3.1.2 Block diagram of the player

8

8

9

9

9

9

9

10

10

11

12

12

12

12

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 tuning circuit

3.2.3 OLED module circuit

3.2.4 Buttons circuit

3.2.5 Headphone jack circuit

3.2.6 Charge control circuit

3.2.7 Battery protection circuit

3.2.8 Power circuit

3.2.9 Reset circuit

3.2.10 Power on/off circuit

3.2.11 Microphone circuit

Section Three Servicing Cases

3.3.1 Servicing cases

13

14

14

15

16

17

18

19

20

21

22

23

23

25

25

3.3.2 Troubleshooting flow chart

Section Four Waveform diagram

Section Five Function Introduction to IC

3.5.1 Function introduction to PNX0102AEX

28

33

40

40

3.5.2 Function introduction to K9F4G08U0M

51

3.5.3 Function introduction to TPS79301

3.5.4 Function introduction to G690L263T71

3.5.5 Function introduction to TPS62200

3.5.6 Function introduction to Lm2713

3.5.7 Function introduction to TEA5767HN

3.5.8 Function introduction to ISL6294IRZ

3.5.9 Function introduction to PIC10F200T

3.5.10 Function introduction to PQ1X281M2ZP

3.5.11 Function introduction to Si1912

Chapter Four Assembly and Disassembly Process

4.1 Disassembly process of the player

4.2 Assembly process for the player

Chapter Cinque PCB board & Circuit diagram

54

55

56

57

57

60

61

62

63

64

64

65

68

Section One PCB board

Section Two circuit diagram

Chapter six BOM List

68

70

74

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 PNX0102 audio decode chip

Adopt famous Plilips PNX0102 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~192kb0s WMA file.
#Mobile storage function

Capable of downloading files form 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(high speed)

USB 2.0 high 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

2

#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

3

#Press in playback interface
#Press for long in playback interface

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

- 4 -

#Press in tuning PRESET mode
#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”

M

4

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

#

Press when playing

5

6

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

7

USB/headphone jack

8

MIC:microphone

2.1.3 MAIN MENU ILLUSTRATION

select channel
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
last 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

1

Playback state

6

Serial number of the current track

2

Number of all tracks

3

Sound effect mode

4

5

Playback mode

Battery capacity

7

Id3 information/singer/lyrics display

8

Time that has been played of the current track

9

Spectrum of the currenttrack

- 5 -

1

2

5

3

4

1

PRESET mode (normal receiving)

2

Battery capacity

3

Frequency of the current radio station

4

PRESET channel display

5

SCAN mode (scanning)

5

1

2

3

1

Name of recorded file

2

Battery capacity

3

Time that has been recorded

4

The left recordable time

5

Recording state

4

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.

3. After installation finishes, restart the computer

and you may use the mobile storage function

normally.

Shown as the following figure:

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

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".

- 6 -

Press button to select upward or

/

downward and then press button to enter
files browsing .

PRESS
FOR LONG

PRESS

PRESS

#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" or press button to exit.

PRESS

PRESS

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.
#FF and FB

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

/

PRESS

track, it switches into normal playback
automatically.

#ADJUST VOLUME

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:

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.

2.2.6 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

2.2.7 RECORDING

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

PRESS
FOR LONG

When playing, pressing button for long

may realize fast backward.

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

PRESS

PRESS
FOR LONG

#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 "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

- 7 -

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.

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

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:

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

#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

2.3.2 PLAY MODE

PRESS

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.

PRESS

- 8 -

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.

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

have difference.

2.3.5 PLAYLIST

#Browse

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

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

PRESS

PRESS

CAUTION:

#It is defaulted to be invalid each time when

power on.

2.3.7 LOCK SETUP

Entering this menu may open or close auto
buttons lock function. If “Lock Enable”is selected
and not any button is operated during 30
seconds, all button functions will be locked
automatically.

- 9 -

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

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

#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

PRESS

#Default

PRESS

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

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

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_X31RU.
ebn" and "X31RU_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.

- 10 -

PRESS

Model

Audio decode chip

Lithium battery

Continuous playback
time

Dimensions/weight

Audio SNR

Headphone out

Frequency range

FM tuning range

Working temperature

Files supported

57.4mm 36.5mm 12.5mm about 23.1g

3.7V 170mAh

The longest time is about 7 hours

X31

Philips PNX0102

90dB

9mW+9mW(320hm impedance)

0~40

18Hz~20kHz

87.5MHz~108MHz

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

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.

2.4 SPECIFICATION

#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 Function introduction

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.

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

MICROPHONE

USB INTERFACE

3V-12V DC-DC

CONVERTER

OLED MODULE

FM MODULE

PNX 0102

NAND

FLASH MEMORY

LDO MODULE

2.8V
VOLTAGE

1.8V

VOLTAGE

BUTTON ARRAY

RESET CIRCUIT

12M CRYSTAL

3.0V VOLTAGE

1.8V

DC-DC

POWER

MANAGEMENT

LI-ON BATTERY

RECHARGE

CIRCUIT

USB INTERFACE

3.3V

DC-DC

Figure 3.1.2.1 block diagram

- 12 -

3.1.3 Introduction to IC of the player

IC model IC model Function

TPS79301 U1 Precision voltage stabilizer

G690L263T71 U2 Reset IC

TPS62200 U3 Precision voltage stabilizer

ISL6294IRZ U4 Charge management

PIC10F200T U5 Voltage detect

PNX0102AEX U6

MP3 decode

PQ1X281M2ZP U7 Precision voltage stabilizer

K9F4G08U0M U8 Flash

SI1912 U9, U10

Dual MOS tube

LM2703 U11

12V boost

TEA5767HN FU1

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:

K9F2G08 U0M-YCBO

U8

1

VCC33

L13 601

C47

104 X5R

R38 100K

D_GND

NC

2

NC

3

NC

4

NC

5

NC

6

GND

7

/RE

FLASH3V3 FLASH3V3

D_GND

CLE
ALE
/WE
/WP

R48
100K

/CE

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

8
9

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

NC

NC

NC

Vcc
Vss

NC

NC

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

NC

NC

NC

NC

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

D_GND

MPMC_AD3
MPMC_AD2
MPMC_AD1
MPMC_AD0

C48
104 X5R

D_GND

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 K9F2G08U0M and peripheral

circuit to finish internal files’s working of read, write and delete. 3.3V volatge circuit provides 3.3V

voltage for FLASH working. R38 is pull up resistor of /CE, R48 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;

SGND

FC6 473 X5R

FC7 473 X5R

FR1

10R

FM_3V3

FC5

475/X5R/6.3V

FC3

472 X7R

SGND

SGND

FC8 473 X5R

FR2 18K 1%

SGND

SGND

SGND

FM_OUTR

FM_OUTL

FC9 333 X5R

SGND

FU1

N.C

31
32
33
34
35
36
37
38
39

N.C

40

FR3

10K

FC12 333 X5R

27

29

30

N.C

DIFL128DIFL2

IFGAI

AGND

AVCC

RFI1

RFGND

RFI2

TCAGC

LOOPSW

N.C

CPOP2VCOT13VCOT24VCOVCC5DGND6DVCC7DATA8CLOCK9N.C

1

FC10

393 X5R

21

22

23

24

26

N.C

LAVO

MPXO25VREF

RAVO

TCIFC

TMUTE

NECTAR-I

TEA5767HN

N.C

20

PHLF

19

PDLF

18

XTAL2

17

XTAL1

16

SWP2

15

SWP1

14

BUSEN

13

BUSM

12

W/R

11

10

FC18

102 X7R

FC17

223 X7R

SGND SGND

FC16

FR6

33K

FC14

102 X7R

FM_3V3

223 X7R

SGND

FC15

22PF

D-GND

D-GND

XT1

CRYSTAL

OR 13MHz

32.768KHz

601

D-GND

FR61

2

2

IIC_SDA

IIC_SCL

601

FR60

FR5

100K

FC2 27PF NPO

FC1 101 NPO

FM_ANT

FM_ANT3

FC4 47PF NPO

FL1

120nH 2%

BB202

MURATA

O603CS

TOKO SMD

COILCRAFT

LLQ1608-AR10G

FM_3V3

FD1

FC11

FL2

33nH 2%

FR4

22R

D-GND

FC19

104 X5R

BB202

FD2

103 X7R

FL3

33nH 2%

SGND

FC13

104 X5R

FM_3V3

dandu

FR7

22R

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:

R66

2M

CN5

GN D1VDD2BS13BS24RES#6D/C#7WR#8RD#9D010D111D212D313D414D616D717IREF18VCOMH19VCC

D5

15

2

2

LCD_DB52LCD_DB62LCD_DB42LCD_DB3

LCD_DB7

CS#

5

GND

R46 4.7K

R47 4.7K

R72

0R

2

2

2

2

LCD_CS

LCD_WR

LCD_DB02LCD_DB22LCD_DB1

LCD_D/C

LCD_RD

2

LCD_RESET2

LCD_3V3

C62

104 X5R

C65

475/X5R/6.3V

P_VDD

L23

601

EN2

2

VCC33

R69 100K

R74 0R

L24

CDRH3D16-4R7

5

VIN

GND

4

EN

TPS61040/LM2703

SW

FB

MBR0520/SOD123

1

2

3

U11

D8

R70

240K 1%

R76

27K 1%

VOLED

L30

GND

C63

22PF NPO

0R

C64

106/25V/1206

16V/104/X5R

C67

NC

21

20

C60

103 X7R

VOLED

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,

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

on two ends of FB, and the following relation is met:

- 16 -

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 Buttons circuit

1. Buttons circuit is shown in the figure 3.2.4.1:

VCC33

R71
1K

KEY_SCAN_2 2

C66
104 X5R

SFI0402-050E100NP

D_GND

KEY_SCAN_1 2

C71

MENU

R16
47K

D_GND

R24 1K

VCC33

Q3

SS8550LT

S2

MENU

C73

SFI0402-050E100NP

D_GND

R21 51K

D_GND

S1

NEXT

R65 1k

S4

VOL+

D_GND

R73 1K

S5

VOL-

VCC33

R19
1K

D_GND

DFU

R22 0R

C72
104 X5R

D_GND

D_GND

S3

PREV

D_GND

C59
104 X5R

C70
SFI0402-050E100NP

Figure 3.2.4.1 Buttons circuit schematic diagram

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 detecting uses voltage division

mode, which uses ADC circuit of PNX0102, through scanning KEY_SCAN_1_2 and KEY_SCAN_2_1

voltage variation, detects preset voltage value of buttons to decide which button functions; when the

relevant button is pressed, the voltage value of the relevant preset point of this button will change;

voltage inputs to ADC circuit of PNX0102, and the internal program makes the corresponding response

to realize function of each button.

- 17 -

3.2.5 Headphone jack circuit

1. Headphone jack circuit is shown in the figure 3.2.5.1:

USB_VBUS

L

R

R55 18R

R57 18R

R59 100K

3

1

SDCW2012-2-900T*

2 4

R77

180K 1%

T1

USB_DET 2

C69
104 X5R

USB_DM 2

USB_DP 2

PHONEJACK
CN2

OUT_L

OUT_R

L15

L18 60

4
2
5
6
3
1

FM_ANT4

60

608

1/1

6

5

4

608

1/1

L16 601

FM_ANT

L17

601/1608

U9

Si1912DL

D1

G2

S2

S1

G1

D2

FM_ANT

1

2

3

R52 10k

OUT_L

OUT_R

Q8

SS8550LT

C54

C55
6PF*

5

1 623 4

6

5

R501KR51

4

PHONE_SEL 2

6PF*

HP_VOUTL 2

HP_VOUTR 2

1K

1

R40
1K

D7

U10

Si1912DL

1

S1

2

G1

3

D2

D1

G2

S2

Figure 3.2.5.1 Headphone jack circuit schematic diagram

2. Working principle: headphone audio output jack of X31 (RU), USB jack and charge jack are all

integrated on headphone socket, so headphone jack circuit fulfills 3 functions of audio output, USB data

change and charge, in addition, ground wire of headphone is also used as antenna input of FM tuning

circuit.

Left and right channel audio signals that output from PNX0102 are being coupled by 220uF

capacitor (C31, C32) and then output to headphone jack circuit. Headphone jack circuit is composed of

the dual MOS tube SI1912DL that controls sound output and the socket Cn2; pin 2 and 5 of SI1912DL

are connected with mute circuit; when MUTE button is pressed, dual MOS tube is cut off to cut output of

headphone left and right channel; D1 in circuit is TVS diode array used for ESD protection to prevent

external static damaging internal circuit through headphone jack.

USB jack line is composed of USB_VBS, USB_DP, USB_DM and GND. PNP triode Q8 in circuit has

reverse insert protection function to avoid damaging MP3 internal circuit because of reverse insert. USB

jack is directly connected with USB control module of PNX0102; after MP3 is connected with computer,

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

with PNX0102 through USB_DP and USB_DM and then connects with flash by PNX01021 to fulfill the

exchange of Flash internal data and computer internal data.

Meanwhile, USB_VBUS is connected with pin 1 IN of charge management IC ISL6294 to realize the

charge to lithium battery. Charge management circuit will be introduced in the next section.

- 18 -

3.2.6 Charge control circuit

1. Charge control circuit fulfills the charge function to lithium-ion battery and circuit diagram is

shown in the figure 3.2.6.1:

R8
1K

8
7
6
5

P_GND

P_GND

D1
BAT43WS

R9
100

R18
510K

G

R20

120K 1%

Q2
SI2305D SS

D S

BAT+

C13
105 Y5V

BAT+

P_GND

1
2

BAT-

CN1
BAT

USB_VBUS

USB_VBUS3

VCC33

/STATUS2

CHGEN2

C11

105 Y5V

R17
47K

P_GND

R5 10K *

VBUS

1

IN

2

PPR

3

CHG
EN4GND

U4 ISL 6 294

P_GND

BAT

IREF

IMIN

Figure 3.2.6.1 Charge control circuit diagram

2. Working principle: charge circuit is composed of charge control IC ISL6294 and peripheral circuit.

Pin IN is ISL6294 power input pin, that is input end of USB 5V power; BAT is output pin of ISL6294, that

is input end of lithium-ion battery; /CHG is charge state indication end; when /CHG is low level, it means

machine is in charge, or else it means the charge finishes; IMIN is min charge current setup end, that is,

when charge current is lower than the current set by this end, charge is terminated. Setup of min charge

current is realized through selecting external resistor R18. The relation between min charge current I

MIN

and R18 is shown as follows:

(mA)

From the above, we know that min charge current is 20 mA.

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

Relation between charge current I and external resistor is shown as follows:

REF

- 19 -

3.2.7 Battery protection circuit

1. Battery protection circuit board is installed on lithium battery and used to prevent lithium battery

from damage of short-circuit, over discharge and over charge. Lithium battery and battery protection

circuit board are together called lithium battery core components. Battery protection board circuit

diagram is shown in the figure 3.2.7.1:

VCC

C2
104

1

BAT+

1

BAT-

S8261AAJMD-G2J-T2 SOT23-6

1

DOUT

2

3

1

2
3

4

U1

V-

COUT

ECH8601 2206A

U2

D1
D1
D2
D2

S1

G1

S2

G2

VSS

VDD

Ct

8

7

6

5

4

6

5

R1
470

C1
104

C3
104

Figure 3.2.7.1 Battery protection circuit diagram

Equivalent circuit diagram of battery protection circuit is shown in the figure 3.2.7.2:

P+

R1

Lithium battery

C1

5

Ct

Vss

VDD

U1

Dout

1

V-

Cout

3

C3

2

R2

4

B

6

C2

U2

P-

Figure 3.2.7.2 Battery protection circuit equivalent diagram

2. Working principle: battery protection circuit is mainly composed of battery protection IC S8261

and internal dual N groove MOSFET ECH8601. S8261 is the protection IC of the lithium-ion polymer

chargeable battery of internal high precision voltage detect circuit and delay circuit. DOUT and COUT

pin are over discharge (when lithium battery voltage is lower than 2.4V) protection output end and over

charge (when lithium battery voltage is higher than 4.2V) protection output end. The two pins are high

level when working normally; MOSFET is on and lithium battery voltage outputs to the player through

protection board; when in protection, the two pins output low level to control MOSFET to cut off power.

Over current detect (short-circuit protection) is fulfilled through the control of DOUT and COUT output by

V- pin when detecting short-circuit state; when battery is in short-circuit, voltage on V- external resistor

R1 will have a sudden change, V- detects that voltage on R2 increases immediately and then outputs to

control DOUT and COUT and outputs low level at the same time to control MOS tube to cut off battery to

protect battery.

- 20 -

3.2.8 Power circuit

1. 3.3V power circuit is shown in the figure 3.2.8.1:

P_VDD

C7

106/X5R

P_GND

R2
68K

EN

U1

TPS7

1

VIN

2

GND
EN3BYPASS

P_GND

9301SO

C6
102

Figure 3.2.8.1 3.3V power circuit

T23-

VOUT

FB

6

6
5
4

C5
103

P_GND

R3
20K 1%

R1

C2 22PF

33K1 %

VCC33

VCC33

C3
106/X5R

P_GND

3.3V power is supplied by IC TPS79301 and peripheral circuit. TPS79301 is linear voltage

stabilizing module (also called LDO), EN pin is the enable pin that controls normal working and high

level is effective; BYPASS has resistor onside and constitutes low-pass filter with external 103 capacitor

C5 to decrease output noise; setup of TPS79301 output voltage is decided by two external resistors of

FB pin and he relation is shown as follows:

From the above, we know that VOUT is 3.2V.

2. 2.8V power circuit is shown in the figure 3.2.8.2:

VCC33

U7

PQ1X281M2ZP

1

VI

2

C36
106/X5R C46

GND
EN3BYPASS

VOUT

5

4

C42
104

P_GND D_GND

Figure 3.2.8.2 2.8V power circuit diagram

D_GND

2.8V

106/X5R

- 21 -