Techfaith ROCK Repair Manual

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General -------------------------------------------------------------------------------------------------------- 3

1.1

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

1.2

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

Summarize ---------------------------------------------------------------------------------------------------- 4

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

GSM 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

ROCK 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

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

6.1

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

6.2

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

ROCK

REPAIR MANUAL

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Summary of Contents for Techfaith ROCK

Page 1: Table Of Contents
General -------------------------------------------------------------------------------------------------- 5 The general concept of honeycomb------------------------------------------------------------------- 5 GSM introduction--------------------------------------------------------------------------------------- 5 Servic area----------------------------------------------------------------------------------------------- 7 GPRS introduction-------------------------------------------------------------------------------------- 8 ROCK detail schematic circuit introduction ----------------------------------------------------------- 9 RF circuit introduction --------------------------------------------------------------------------------- 9 Baseband circuit introduction------------------------------------------------------------------------ 11 Power management circuit introduction------------------------------------------------------------12 Peripheral driver circuit ------------------------------------------------------------------------------13 5.4.1...
Page 2 DCS measurement step--------------------------------------------------------------------------------21 PCS measurement step --------------------------------------------------------------------------------22 Test point ----------------------------------------------------------------------------- 错误！未定义书签。 Trouble shooting --------------------------------------------------------------------------------------------23 Attentions -----------------------------------------------------------------------------------------------23 Repair equipments and tools -------------------------------------------------------------------------24 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...
Page 3: General
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.
Page 4: Summarize
2 Summarize 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...
Page 5: Gsm System Theory
4 GSM 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.
Page 6 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.
Page 7: Servic Area
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.
Page 8: Gprs Introduction
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...
Page 9: Rock Detail Schematic Circuit Introduction
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.
Page 10 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.
Page 11: Baseband Circuit Introduction
5.2 Baseband circuit introduction Baseband circuit is mainly composed of U200 CPU chip, U306 memory chip, OSC400 32.768KHz crystal. The baseband processing tasks are divided between the DSP and ARM9 processor cores. Many RF controlling signals come from CPU and the working states of a phone lie on these signals .
Page 12: Power Management Circuit Introduction
5.3 Power management circuit introduction U401(power management IC) is an integrated circuit used to provides all the power to the mobile and management of charging circuit. It is completely solution for power supply generation ,battery management including charging and a subscriber identity module card interface including supply generation .The device is controlled by a host controller via a 400KHz I2C serial interface .
Page 13: Peripheral Driver Circuit
5.4 Peripheral driver circuit ROCK mobile has many additional functions, These functions need further hardware driver support. 5.4.1 Display and camera Camera and LCD controlled by the U1101 chip(MV3020SNK). Its working frequency is 24MHz . The MV3020SNK is a highly integrated IC, dedicated to embedded camera applications (mobile phones).
Page 14: Lcd Backlight And Leds
32kbytes of program memory is used to control the interfaces. The LCDC chip is in BGA package 5.4.2 LCD backlight and LED There are 4 LEDs in LCD backlight circuit in series .The IC RT9284 provides power for these LED and it converts the voltage of main battery to 18.5V if the enable signal GND_LED is high .We can set the duty of GND_LED to different value to change the lightness of the LCD backlight.
Page 15: Switches (Keypad)
5.4.3 Switches (keypad) The keypads LEDs are powered by the main battery and controlled by the GPO3 of PMU. When GPO3 is high ,the keypad LEDs are off and low then on. 5.4.4 Audio Subsystem a) MIC ,Receiver and Speaker The MIC converts the sound signals to analog signals and...
Page 16 input them to CPU . These signals are processed in CPU and then sent out by the RF circuit. The RF circuit receives the RF signals ,these signals are processed in transiver and CPU ,then drive the receiver to phonate. When the preset midis and mp3 are played ,the audio signals are outputted from HFR1 and HFR2 .The signals are amplified by FU1 ,then drive the speaker.
Page 17: Radiogram System
b) Earphone The earphone detecting depends on the changing of the voltage of AUDIO_DETECT. The voltage of MIC_BIAS_AUX is about 2.1V, if the earphone is plugged out , the voltage equals to that of MIC_BIAS_AUX .If the earphone is plugged in , the voltage of AUDIO_DETECT is about one of two of that of MIC_BIAS_AUX .
Page 18: Sim Interface
5.4.6 SIM Interface SIM interface circuit is suitable for the SIM card of 3V , the connector CN502 is SIM card holder .SIM_CLK is the clock signal of SIM card ,SIM_RST is the reset signal of SIM card provided the PMU .The data is transmitted by SIM_I/O between SIM card and PMU .SIM_VCC and CCGND are the power supply signals for the SIM card provided by PMU .
Page 19: Mobile Measurement Fundamentals Introduction
6 Mobile measurement fundamentals Introduction The below equipments are needed for the general measurement of the GSM mobile: GSM wireless communications test set: such as AGILENT 8960, CMU200 etc. Antenna adaptor (SKN4870A), and the additional RF 50 ohm cable and connector Test SIM card (8102430z01) Full charged battery.
Page 20: Equipment Configuration
6.1 Equipment configuration First, insert the SIM card into the SIM card socket in the back of the mobile, and then put the battery on the back. Last, use RF cable to connect the adaptor and the input and output port of the wireless communications test set, and power on the test set and the mobile.
Page 21: Dcs Measurement Step
Power level 10 (23 dBm) transmit power error CH62 -3db +3db Power level 15 (13 dBm) transmit power error CH62 -3db +3db RES II (-103 dBm) receive BER (bit error rate) RES II (-103 dBm) receive FER (frame erase rate) 0.12% RX_LEV indicate on -100 dBm -104 dB...
Page 22: Pcs Measurement Step
RMS phase error (max power and smallest power) 0° 5° Peak phase error (max power and smallest power) 0° 20° Average frequency error -171Hz +171Hz Power level 5 (20 dBm) transmit power error CH700 -2db +2db Power level 10 (10 dBm) transmit power error CH700 -3db +3db Power level 15 (0 dBm) transmit power error CH700...
Page 23: Trouble Shooting
Legend 3: Pcs test items Lower limit Upper limit RMS phase error (max power and smallest power) 0° 5° Peak phase error (max power and smallest power) 0° 20° Average frequency error -171Hz +171Hz Power level 5 (20 dBm) transmit power error CH700 -2db +2db Power level 10 (10 dBm) transmit power error CH62...
Page 24: Repair Equipments And Tools
7． HAKO851 – Temperature controlled electric dryer 8． Computer ( with GPIB card) 9． 50 Ohm cable line 、N160 back plug line 10． Level shifter box — Provided by Techfaith Electric iron temperature/time Normal weld spot： 350°±10°，<= 5 seconds： Big weld spot： 400°...
Page 25: Phone Repair
serial cable, and the level shift box connect with mobile through back plug line, connect with the wireless communications test set through 50 Ohm RF cable. 7.3 Phone repair The whole phone repair mainly repair the phone which can’t pass the CIT function test and call test and antenna test.
Page 26: Lcd Abnormal Display
shorted please check the board. If the “+” pole is not grounded then use a good LCD module to do the replace experiment, if the mobile can power on now, then should change the LCD module. If the mobile still can’t power on then there must something wrong with the pcb, please retest the PCB board, if the test pass then redownload software can get rid of it, if the test fail, then should repair the PCB as the following chart introducing methods.
Page 27 connector CN801 on main board whether it is broken or bad solder, then resolder it or change it. If it is not the problem, according to the following chart introducing methods, it can resolve these problems.
Page 28: Speaker No Sound
7.3.4 Speaker no sound First enter the CIT test mode, if the speaker is ok, then you should reinitialize the software. If the speaker has no sound, then use a good speaker to do the replace experiment, if the new speaker has sound, then change speaker is ok, if the new speaker is also no sound, then should check the solder of speaker and resolder can resolve the problem.
Page 29: Mobile Can't Identify The Sim Card
7.3.6 Mobile can’t identify the SIM card First make sure the SIM card is not damaged, use a good SIM card to test if the problem still exist. If still exist, then check if it is the problem of the SIM card socket, change it or resolder it. If it is not the problem of the socket, then it is always the problem of U401(PMU) chip, resolder it or change it can always resolve it.
Page 30: Key Press No Function
7.3.8 Key press no function ROCK mobile just have 21 keys. If only one key no function, please disassemble the mobile back housing, check if the metal dome damaged or the corresponding pad is dirty. If there are 4 or 5 or multiple key no function, the root cause is CPU unsoldered or fault.
Page 31: Schematics
check the output power of C151 and C153,if the power is abnormity then should check OSC100 clock circuit and U110,resold or change it ,the problem will be resolved ,if can’t,U200 CPU should be checked. For the method checking the RX path, it’s the same with checking Tx path. And also accoding to the following chart introducing methods to repair.