Techfaith ROCK Instrucciones de funcionamiento

ROCK

REPAIR MANUAL

1General -------------------------------------------------------------------------------------------------------- 3

1.1 The purpose of the manual ---------------------------------------------------------------------------- 3

1.2 General safty notice ------------------------------------------------------------------------------------ 3

2Summarize---------------------------------------------------------------------------------------------------- 4

3Identity and safety------------------------------------------------------------------------------------------- 4

4GSM system theory ----------------------------------------------------------------------------------------- 5

4.1 General -------------------------------------------------------------------------------------------------- 5

4.2 The general concept of honeycomb------------------------------------------------------------------- 5

4.3 GSM introduction--------------------------------------------------------------------------------------- 5

4.4 Servic area----------------------------------------------------------------------------------------------- 7

4.5 GPRS introduction-------------------------------------------------------------------------------------- 8

5ROCK detail schematic circuit introduction----------------------------------------------------------- 9

5.1 RF circuit introduction--------------------------------------------------------------------------------- 9

5.2 Baseband circuit introduction------------------------------------------------------------------------11

5.3 Power management circuit introduction------------------------------------------------------------12

5.4 Peripheral driver circuit------------------------------------------------------------------------------13

5.4.1 Display and camera --------------------------------------------------------------------------------13

5.4.2 LCD backlight and LEDs--------------------------------------------------------------------------14

5.4.3 Switches (keypad)----------------------------------------------------------------------------------15

5.4.4 Audio Subsystem-----------------------------------------------------------------------------------15

5.4.5 Radiogram system----------------------------------------------------------------------------------17

5.4.6 SIM Interface ---------------------------------------------------------------------------------------18

5.4.7 System Connector ----------------------------------------------------------------------------------18

6Mobile measurement fundamentals Introduction----------------------------------------------------19

6.1 Equipment configuration -----------------------------------------------------------------------------20

6.2 EGSM measurement step -----------------------------------------------------------------------------20

6.3 DCS measurement step--------------------------------------------------------------------------------21

6.4 PCS measurement step--------------------------------------------------------------------------------22

7Test point-----------------------------------------------------------------------------错误！未定义书签。

8Trouble shooting--------------------------------------------------------------------------------------------23

8.1 Attentions -----------------------------------------------------------------------------------------------23

8.2 Repair equipments and tools -------------------------------------------------------------------------24

8.3 Phone repair--------------------------------------------------------------------------------------------25

8.3.1 Receiver no sound, microphone no voice -------------------------------------------------------25

8.3.2 Incapable power on---------------------------------------------------------------------------------25

8.3.3 LCD abnormal display-----------------------------------------------------------------------------26

8.3.4 Speaker no sound-----------------------------------------------------------------------------------28

8.3.5 Camera abnormal function ------------------------------------------------------------------------28

8.3.6 Mobile can’t identify the SIM card---------------------------------------------------------------29

8.3.7 No vibration-----------------------------------------------------------------------------------------29

8.3.8 Key press no function------------------------------------------------------------------------------30

8.3.9 RF trouble shootin----------------------------------------------------------------------------------30

8.4 schematics ----------------------------------------------------------------------------------------------31

ATTENTION

The product must be repaired by the experienced engineers, we will not responsible for the

damage caused by any other person using this manual as instruction to repair products.

The manual owned by Techfaith Beijing, no part may be reproduced except as authorized

by written permission. the copyright and the foregoing restriction extend to reproduction in all

media.

Whilst every care has been taken in the preparation and publication of this document, errors in

content, typographical or otherwise, may occur. If you have comments concerning its accuracy,

please write to:

Beijing Techfaith R&D CO.,LTD.

NO.10A,Tower D2,IT Park, Electronic Town ,Jiu Xian Qiao North Road, Chao Yang

District.

Beijing, China.

P.C: 100015

1General

1.1 The purpose of the manual

The manual is just used for the experienced engineer not the general publication, providing

basic reference for electric and mechanic repairing.

1.2 General safety notice

Products with power should be repaired by the experienced engineer any other

person use this manual to repair product may

cause damage to it. Products have many

capacitors with polarity, which should not

be short and in reverse connected. For fear

damage the ESD sensitive components, Pay

attention to ESD protection during

repairing. Don’t use mobile phone on the

airplane. Don’t use mobile phone near

flammable gas or oil.

2Summarize

ROCK mobile phone for Russia support Tri-band, the mobile phone can automatic switch in

GSM900 network and DCS1800 、PCS1900 network. Inter antenna reduce the radiation to body

and more easy to take as well as providing good signal. And it has fashionable 65K double color

screen 、inter antenna 、1.3M inter camera 、MP3 、MP4、MMS and GPRS high speed data

transfer、Bluetooth、FM radio 、color motive game etc functions. There are several difference

between selling in Chinese and Russia. For the detail product feature, please see the Product

Feature document.

3Identity and safety

Each ROCK mobile phone has one identification number IMEI.

IMEI(international mobile station equipment identities) number is saved in the mobile

memory. One IMEI number exclusively represent one mobile equipment, so if changing

mainboard , IMEI number should changed together.

IMEI composition

TAC: type approval code

FAC: final assembly code

SNR: serial number

SVN: software version number

4GSM system theory

4.1 General

Below is the basic introduction of Global System for Mobile communications (GSM) cellular

network, which is just a brief introduction. If you want to know the detail technology, please refer

to the GSM_SPEC_PHASE 2+ .

4.2 The general concept of honeycomb

The cellular systems are now using in the EGSM and DCS frequency bands to provide

wireless telephone services. Comparing with the ordinary wireless telephone system, the

cellular networks have more calling service and system capacity. Ordinary wireless telephone

system’s each working channel should cover all the area, but the “honey comb” systems just

need to cover the several adjacent cells or just one cellular cell.

Each cellular cell has one Base Station (honeycomb station), with transmitting and receiving

equipment for a pair of frequencies (one channel). Because each cellular cell is much smaller, then

the Base Station and operating wireless telephone all have smaller power consumption than

ordinary system. Then the power of a specific channel is just confined in the cellular cell area,

sometimes extending to the direct adjacent cellular cells.

Because the a specific channel in one cellular cell just confined in the small area, then the

channel can be used in another cellular cell area beyond the first cell. Then several users can use

one channel in a big area, and don’t interfere with each other.

4.3 GSM introduction

Other than the analog cellular system, GSM system use digital wireless technology, which

have below advantages:

International roaming --- because the international agreement and standardization, then the

GSM equipment can be used in any other country using GSM system.

Digital air interface --- There are all digital connections between the GSM telephones and

the Base Stations, and the Base Station also digitally connect to switching system and PSTN.

ISDN compatibility --- ISDN is a kind of digital communication standard which will be

adopted by almost country all over the world and using the existing PSTN system to transmit the

digital voice data. GSM telephone is compatible to the ISDN.

Security and Secrecy --- The analog system is easy to eavesdrop using specific

radio receiver, but the GSM system gets a big improvement because the data was digital

coding before transmitting.

Better voice quality --- The digital system is more effective to deal with the co-channel

interfere, transmission interrupt and multi-path fading, and voice quality can be improved by error

correct coding.

Efficiency --- GSM system is more efficient in using frequency spectrum than analog

system.

As figure 1 shows, bold line area indicate a overall area covered by a GSM system. The area

was divided into several small cellular cells, each cell has a cellular base station, each base station

occupies a group of given channel.

Figure 1：Cellularsketchmap Figure2：Channel division sketch map

For example, suppose cell A occupies 1 - 8 channels, cell B occupies 9 - 16 channels, cell C

occupies 17 – 24 channels, then cell D can also use 1 – 8 channels same as the cell A, because

they are not close to each other. Then cell E can also occupies 9 – 16 channels and cell F occupies

17-24 channels. As figure 1 shows.

Because the telephone can work on any channel in system, then it can also work in any

cellular cell. Although the mobile just need small power to communicate with base station in a

specific cell, but if the same frequency used in a small area, it may also arouse the problem

co-channel interfere. Through using the digital modulation, front error correct and equilization

technologies, GSM system can contain more co-channel interfere. This indicate that in GSM

system, the cells occupy the same frequency can get more closer than analog system. Then the

GSM system has better frequency usage and has bigger user capacity.

GSM system adopts TDMA and FDMA modulations, and the whole frequency band is

divided into two bands (uplink band and downlink band). Mobile use the uplink channel to

transmit signal, and base station use the downlink channel to transmit signal. Each channel

occupies 200KHz bandwidth, and is identified by one number as ARFCN. Other than frequency

division, GSM also use time division technology. Each ARFCN is shared by 8 time slots. Each

mobile just occupies one time slot in one ARFCN, then waiting for the corresponding time slot in

the next frame. As figure 2 shows, there are 4 TCH channel, each channel occupies one specific

ARFCN and time slot, 3 TCH channel in one ARFCN, but the time slot is different, the other TCH

channel is on another ARFCN. The data is modulated into the carrier using GMSK methods.

The continuous signal bursts can be transmitted in different frequencies, which is called

frequency hopping. Frequency hopping reduces the influence of RF fading, and improves the

security and secrecy of data link. GSM mobile just need transmit one burst in each frame, doesn’t

need to transmit continuously, so it makes the mobile more effective to save power.

The GSM system can automatically hand over the mobile from one cell to another cell,

which the user doesn’t feel unconvenience. The mobile can detect the signal strength of the

neighbor cell, and if the signal of the neighbor cell is bigger, it will inform the base station, and

the base station will switch it to the neighbor cell. All the procedure is done automatically, so the

user can’t fell it.

4.4 Service area

The GSM operator determine the area in which the user can send and receive call, if the

mobile exceed the area, signal (no operation) appear then the user can not send or receive call,

if the situation appear when talking, then the call will be interrupted.

The mobile phone’s identity information is stored in the HLR and the VLR of the local GSM

system. The VLR include all the identity information of the local mobile. If mobile roam to

another place, area or country, the identity information will send to the new system’s VLR, which

will verify the information with its original system, if it is right, then the phone can be used in the

new area.

4.5 GPRS introduction

Comparing the GSM system’s telephone service, GPRS provide the LAN and WAN service,

which provide GSM operator a new market, and provide user new function. GPRS support wide

applications, such as small data irregular transfer, surfing internet and large amount of data

transfer.

GPRS was designed for multipurpose service, which include following character:

1.4.0 Data rate can change from several bit/s to 120Kbit/s, then it is low speed, and also high

speed.

1.4.1 User can long time attach and connect to the GPRS server, the cost occur just when the

data transfer. GPRS operation just like using the office pc, powered on in the morning

and powered off in the afternoon.

1.4.2 The initial response time is faster than the circuit exchange, because the service is

continuous but the user only irregularly uses it. The GPRS server is waiting a hit to

activate, and the user don’t need to reconnect when use it.

1.4.3 GPRS is covering area just like GSM is seamless, and it permits simultaneous several

connections.

5 ROCK detail schematic circuit

introduction

mobile telephone According to the schematics，there are four parts in ROCK circuit ：RF Circuit、

Base band Circuit、Functions Circuit、Connecters Circuit。

5.1 RF circuit introduction

ROCK RF circuit mainly include U106 transceiver chip, U105 power amplifier chip, U102

GSM saw filter, U103 DCS saw filter, U104 PCS saw filter,U101 RF switch module, CN102RF

test connector etc. components. According to function RF circuit can divided to receive path

circuit, transmit circuit and coupling feedback control circuit three parts.

Receive path circuit is mainly composed by U102 GSM saw filter, U103 DCS saw filter,

U104 PCS saw filter,U101 RF switch module, CN102 RF test connector etc. components, U106

transceiver chip. The RF signal first received by the antenna, is sent into the mobile, Then the

signal passes through RF test connector CN101, then passes through the matching circuit

composed of R101, C101 and C102, which used for matching the antenna to the 50 Ohm RF strip

line. enters into the U101 RF switch module which cotroled by the software when it work for

receiving or transmitting, if it work for receiving, then the signal enters into the U102 GSM saw

filter through the RX1 port or into the U103 DCS saw filter through the RX2 port or into the U104

PCS saw filter through the RX3 port filtering the wanted signal. Then the signal enters into the

U106 transceiver chip through its GSM-RF-IN port or DCS-RF-IN port and PCS-RF-IN,

demodulated into the IQ signal to the U200 baseband chip.

Transmit path circuit is mainly composed of U106 transeiver chip, U105 power amplifier

chip, U101 RF switch module, CN102 RF test connector. The IQ signal generated by the U200

first is modulated into the RF signal in U106 transeiver chip, then it enters the U105 amplifier chip

through the TX900 (GSM) or TX1800 (DCS) or TX1900(PCS) port and matching circuit, then the

amplified signal enter the U101 RF switch module , and then controlled by software transmitted

through antenna.

The function of power control circuit is control the power accord with the GSM specification

transmitted from U105 power amplifier chip.

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