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Service Manual

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Introduction The purpose of this document is to help service workshop technicians to service products. This service

manual must be used only by authorized service suppliers. The content of it is confidential. Please note

that provides other guidance documents for service suppliers. Follow these regularly and comply with the

given instructions. While every effort has been made to ensure the accuracy of this document, some errors

may exist. Please keep in mind also that this documentation is continuously being updated and modified,

so always watch out for the newest version.

CAUTIONS 1、 Please read this service manual carefully and make sure all elements of anti-static are in place before

the repair work is carried out.

2、 Servicing and alignment MUST be undertaken by qualified personnel only.

3、 Please use specified tools and equipments for servicing, in which the parameters need to be calibrated

with specified criteria.

Content

Chapter 1 Product Specification………………………………………………………………………….….3

Chapter 2 Explosive View………………….…………………………………………………………….….4

Chapter 3 Tools…………………………..……………………………………………………………….….5

Chapter 4 Guidance of Disassembly/Assembly.......................................................................................6～8

Chapter 5 Pictures of PCBA…………………………………………………………………………….9～10

Chapter 6 System block diagram……………………………………………………………………...…...11

Chapter 7 Circuit diagram for each unit………………………………………………………….......12～18

Chapter 8 Troubleshooting Guide…………………………………………………………………....19～24

Chapter 9 Guidance of Firmware Upgrading & Write IMEI………………………….……..............25～33

Chapter 10 CIT Testing…………………………………………...……………………………………….34

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Chapter 1 Product Specification

Specification： Network: GSM/GPRS 900/1800 or 850/1900MHz Display: 1.8“TFT QQVGA Radio：FM radio FM Record to T-Flash Talking time:570Min＊ Standby time:289H＊ Lithium Battery: Standard（1000mAh） USB Charging：USB 1.1 ＊The actual time shall vary depending on the network situation

Main features and functions

Dual SIM Dual Standby Single Connection

FM Radio

Multi-Media

USB 1.1 data transfer

T-Flash（Support 8G T Card）

1.8“TFT QQVGA

MP3/ AVI

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Chapter 2 Explosive View

5

Chapter 3 Tools

Voltage regulator

Multi-meter

lron

850 heater

Solder wire, soldering paste

Computer and software download cable

tweezers、screwdriver、pick、wrist strap

pick

Screw tweezers

Wrist strap

Writ strap

Software

Solder wire

Soldering paste

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Chapter 4 Guidance of Disassembly/Assembly 4.1 Disassembly

Unfasten the 6 screws by screwdriver 2

Take out the front cover 4

Stick LCM protection film 5

Prize up the middle housing 3

Stick lens protection film 6

Push out the battery cover from left 1

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4.2 Assembly

Prize up the PCBA by tweezers 7 Take out the microphone by tweezers 8

Install the back cover 4

Install main PCBA in back cover 2Install the microphone by tweezers 1

Tighen the main PCBA 3

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Finish……….

fasten the 6 screws by screwdriver 6Tighen the back cover 5

Install the battery cover 7

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Chapter 5 Pictures of PCBA 5.1 Pictures 5.1.1 Instruction & location of main components on side A.

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A 面图

5.1.2 Instruction & location of main components on side B.

U101 CPU

MT6252

U502 PA RF7170

Keypad connector

U301 Flash IC

J302 I/O Connector

J201 battery Connector

X201 crystal

32.768K

J502 SIM Connector

J503 SIM Connector

LCD Connector

J301 T-FLASH Connector

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5.2 Layout 5.2.1 Layout of PCBA side A

5.2.2 Layout of PCBA side B

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Chapter 6 System Block Diagram

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Chapter 7 Circuit Diagram for each unit

7.1.1 CPU & Baseband

Audio process

Keypad interface

O/I Interface

JAVA Process

CAMERA Interface

BT Module

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7.1.2 Keypad input interface

7.1.3 32.768KHZ clock crystal circuit

Clock Signal I/O

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7.1.4 Data line of CPU and Flash

7.1.5 Output of SIM

SIM 2 Clock

SIM 2 Reset

SIM 2 Data SIM 1 Clock

SIM 1 Reset SIM 1 Data

FLASH data transfer

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item voitage current Vcore 1.2v 200ma

Vio 2.8v 100ma Vadd 2.8v 150ma Vtcxo 2.8v 20ma Vrtc 1.2v 200ma

Vmem 2.8v 150ma Vsim 2.8v 20ma Vcs 2.8v 200ma

vcs 1.8v 150ma

7.2 Power output of MT6252 CPU

Charging Temperature

Detector

Positive Voltage

Supply

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7.3 Audio Amplifier U201

7.4 I/O Interface (10PIN)

7.7 Power Amplifier

Data

Transfer

Firmware

Downloading

Charging

Voltage Input

Audio Signal Output

3.7V Power

Supply

Audio Start Signal

Audio Signal Input

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7.5 FM Radio Modules The AR1216 processes the FM broadcasting signal that received from antenna (FM/ANT) ,produces and sends audio signals (FM-INL, FM-INMR) to the audio process module of CPU for decoding, where the electrical signals of audio are made.

Frequency Band

Selection

Power Supply

RF Signal Input

Receive Signal Output

Antenna

RF7170

32KClock signal input

Antenna Audio output

Data Communication Port

2.7V Power Supply

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7.6 SIM Circuit

SIM 1Clock

SIM 1 Reset

SIM 1 Power Supply

SIM 1 Data

SIM 2 Power Supply SIM 2 Clock, Reset SIM 2 Data

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Chapter 8 Troubleshooting Guide Cannot Download Firmware

Replace or Re-solder I/O connector

Check if CPU has power

output and open circuit

Cannot download

Check software

configuration, cable,

power supply, software,

C

Can power

on?

NO

NO

NO

NO

YES

YES

YES

YES

YES OK

Change or reconfigure Check if I/O connector

is false weld or

damaged

Plug the cable and

check if the current is

high(normally 30mA）

Unplug the cable and

check if the chipset is

overheated

Check VCORE、VDD、VADD、

VTCXO、VRTC、VMEM、test

26MHZ、32KHZ Clock signal

Replace U101

NO

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SIM cannot be recognized

Change SIM

MT6252 is broken

SIM is not recognized

Clean or change SIM slot

Are SIM contacts

broken?

NO

NO

NO

NO

YES

YES

YES

YES OK

Problem Solved

Is SIM invalid?

Use power regulator

to test if the current

is normal.

CPU MT6252 is possibly false

soldered or damaged.

Change U101 MT6252

NO

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Change battery

MT6252 is broken

Cannot Power On

Re-solder or change

J201 Check battery

Contacts J201

NO

NO

NO

NO

YES

YES

YES

YES YES

Problem Solved

Try to power on when

connect to the power

regulator

Check if the current

is around 30～40MA

Firmware upgrading

Change U101 MT6252

NO

Cannot Power On

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Change

receiver

Test if LS401 with

Oscillograph when on

the call.

Receiver no sound

Check if LS401 is

broken.

NO

NO

NO

NO

YES

YES

YES YES

Clean or Re-solder

LS401

Check if the receiver

is broken.

Test receiver by

using power supply,

if there is sound of

Change receiver.

Change CPU MT6252

NO

NO

Check hand free mode

(Speaker) is ok

Receiver No Sound

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No Incoming Ring

Cancel mute.

Test the LS401 when

ringing is on by using

oscillograph.

No incoming ring

Remove receiver and

test with power

supply to see if there

NO

NO

NO

YES

YES

YES YES

Change speaker

Check if handset is

set to mute.

Check if the volume is set to lowest level.

Turn up the volume

Change U101 or U401

NO

*#84666*#, Option7, test ringtone

NO

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Display Problem

Clean or Re-solder J705

t t

Check if the pin13 of

J705 has signal and the

connector is normal.

Display problem

NO

NO

NO

YES

YES

Check the LCD

contacts.

Change LCD

Problem solved

Change or re-solder U101 MT6252

Check if the LCD is

broken or liquid

leaked.

NO

YESFirmware upgrading

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Chapter 9 Firmware Upgrading Guide 9.1 Firmware Upgrading 9.1.1 Install USB driver The maximum downloading speed can be up to 921600bit/s when using USB-Serial cable. The driver needs to be installed before using the USB cable.

Please keep the USB cables unplugged when installing the driver. Plug the USB cable when installing is completed. And check device manager of the PC.

9.1.3 Please select “Options”-“COM port”-Choose the port which is same as the one in “Device Manager”

9.1.2 Run “FlashTool_v3.2

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9.1.4 Select “Options”-“Format FAT (DISABLED)…” and please do NOT select “validation”.

9.1.5 Please select “Do Not Format FAT”.

Select this one

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9.1.6 Click “Download Agent” and select “MTK-ALLInOne.bin” 9.1.7 Click “Scatter-loading” and select “scatX11-23.txt” file.

Double click

Double click.

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9.1.8. Click “ROM” and select “X11-23_PCB00_gprs_MT6226_S01. Bin” file. Note: Please use the latest version.

Double click

双击

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9.1.9 Power off the handset, remove the battery, click “Download”, and connect the cable with handset, then insert the battery, press the power on button, the red and blue progress bar shall appear. .

9.1.10 Downloading is in process.

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9.1.11 Downloading is completed.

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9.2 IMEI Writing Guide

How to use IMEI_Writer to write IMEI General The IMEI_Writer software should be used in a Windows XP operation system. The pictures in this document help to understanding, and thy may not be exactly the same as showed in your computer. 1. Write IMEI to the slave phone of MGSM 41B phone to give an example. 1.1 firstly, plugs the correct upgrade cable to the computer. This is necessary, or the software will not be run normally. 1.2 double-clicks the logo in figure 1-1 to run the IMEI Writer in a Windows XP operation system.

Figure 1-1

For the first time you run IMEI_Writer in the computer, figure 1-2 occurs. Choose the right database file for the slave phone of MGSM 41B phone referring to figure 1-3.

Figure 1-2

Figure 1-3

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1.2 input the IMEI of the slave phone referring to figure 1-4, click “Restart”, after 3 seconds plug the slave phone cable connector to the phone and power on the phone.

Figure 1-4 1.3 after several seconds, figure 1-5 occurs to show the slave phone is written to the phone successfully.

Figure 1-5

2. Write the IMEI of the master phone. If necessary, you can also use IMEI_Writer to write IMEI to the master phone conveniently.

Input the IMEI here

Click here to change the database file

Showing writing IMEI successfully

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2.1 Change the database file to be for the master phone, referring figure 1-4. 2.2 Input the IMEI of the master phone, click “Restart”, after 3 seconds plug the master phone cable connector to the phone and power on the phone. 2.3 after several seconds figure 1-5 occurs to show the slave phone is written to the phone successfully. 3 write the IMEI of another phone If the right database file has already been chose, click the “restart”, input the IMEI of the phone, click “Restart”, after 3 seconds plug the phone cable connector to the phone and power on the phone. After several seconds, figure 1-5 occurs to show the slave phone is written to the phone successfully.

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Chapter 10 CIT Testing

Input “*#84666*#” when in the standby mode:

1、Version: Confirm the firmware version.

3、Echo Loop: Receiver shall produce sound when blowing over the mic.

4、Keypad: Press every button on the handset until the screen is clear.

5、Vibrator：Press “start” then the vibration shall start.

6、Lond SPK: Press “start” the speaker shall work.

7、Ringtone: Press “start” the ringtone shall be played.

8、LED：Press “OK” to test the LED.

9、LCD: Select “Auto Display” LCD shall perform the self-testing.

11、Receiver：Press “start” the receiver shall produce sound.

Camera: Menu- Camera, test the capture and shooting, no need to save.