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FLY EZZY 3 Скачать руководство пользователя страница 6

Chapter 3: Explanation of Schematic

MTK6253

MT6253

MTK6253

Picture 3.1 MT6253 principle picture

3.1 Principle of RF circuit

3.1.1 Principle of receiver circuit

3.1.1.1Rx signal flow chart:

Picture 3.1.1 Receive signal flow frame

3.1.1.2 Main function of RF

RF part generally means the analog RF and IF process system ,including Antenna system

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TX path

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RX path

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Analog modem and Frequency Synthesizer

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SKY77542

CPU

MT6253

Transceiver

MT6253

bring

UnRegister

ed

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Содержание EZZY 3

Страница 1: ... FLY EZZY 3 SERVICE MANUAL U n R e g i s t e r e d ...

Страница 2: ...CONTEANT LIST Chapter 1 Summary Chapter 2 Exploding Diagram Chapter 3 Explanation of Schematic Chapter 4 Failure Analysis Chapter 5 Manual of tool software Chapter 6 Tools List U n R e g i s t e r e d ...

Страница 3: ...itate your work and entertainment In order to support technicians to be familiar with FLY EZZY 3 handset please master the method of servicing In addition we provide corresponding technical data including CKT base band RF and software There are also many base band and RF test reference points and description of circuit You can refer to maintaining examples Hope it could give you some help Main spe...

Страница 4: ...U n R e g i s t e r e d ...

Страница 5: ...The main board placement U n R e g i s t e r e d ...

Страница 6: ...inciple of receiver circuit 3 1 1 1Rx signal flow chart Picture 3 1 1 Receive signal flow frame 3 1 1 2 Main function of RF RF part generally means the analog RF and IF process system including Antenna system TX path RX path Analog modem and Frequency Synthesizer SKY77542 CPU MT6253 Transceiver MT6253 bring U n R e g i s t e r e d ...

Страница 7: ... meets the GSM specification And then the bursts are transmitted to Base station through The antenna The signal interface between RF Circuit and Baseband is analog baseband I Q signal The Performance of RF Circuit can directly affects the signal transmission quality of the mobile phone The schematic of RF block for MTK GSM Dual band RF solution is show below From the chart we can see that the RF p...

Страница 8: ...X VCO and tank External TX filters eliminated Integrated Loop filter components Transmit Path AD6548 uses only a single VCO source to derive the local oscillator signal for both the Feedback Down Converting Mixer and the Quadraturemodulator TX PA SKY77542 U n R e g i s t e r e d ...

Страница 9: ...al N dividers sigma delta compensation charge pump and loop filters are fully integrated The only external component is the frequency reference 26MHz Clock Reference circui 3 1 5 High performance multi band PLL system Fast Fractional N Synthesizer U n R e g i s t e r e d ...

Страница 10: ...ntegrated LDOsallow direct battery supply connection 3 1 7 Frequency ranges The frequency ranges of the synthesizer for RX mode RX mode E GSM 900 DCS 1800 925 2MHz 959 8MHz 1805 2 MHz 1879 8MHz The frequency ranges of the synthesizer for TX mode TX mode EGSM900 DCS1800 880 2MHz 914 8MHz 1710 2 MHz 1784 8MHz U n R e g i s t e r e d ...

Страница 11: ...3 1 3 MT6253 Function Block Diagram MT6253 U n R e g i s t e r e d ...

Страница 12: ...put Range Charger input up to 8V Seven LDOs optimized for specific GSM Sub systems One LDO for RF transceiver High operation efficiency and Low stand by current Li Ion battery charge function SIM Card interface Two open drain output switches to control the LED and vibrator Three NMOS switches to control RGB LEDs Thermal Overload Protection Under Voltage Lock out Protection Over Voltage Protection ...

Страница 13: ... Power 1 8V 1 5V 2 8V 2 8V 2 8V 1 8V 2 8V 1 8V 3 3V 2 8V 2 power on off circuit Function Digital core voltage LDO output Digital I O voltage LDO output Analog LDO output Crystal or VCTCXO LDO output External memory LDO output LDO output to SIM card LDO for RF transceiver U n R e g i s t e r e d ...

Страница 14: ...lection MT6253 is available to control the pulsed charging current The pin CHRIN is to detect the Charger The pins ISENCE BATSENES can calculate the battery voltage by detect the voltage of R400 and calculate the charge current by the voltage of the resistance R400 In different charge mode Baseband chip sent the different PWM pulse signal to MT6253 so the MT6233Acan control the process of charge T...

Страница 15: ...ERAPHONE and HANDFREE MIC There are 4 speakers each speaker is drove by an AF amplifier The baseband chip sends the AF Signal to the AF amplifier though MP3_OUT port After the AF signal is amplified it goes to the Speaker The RECIEVER is drove by the baseband chip directly As an electrets tone arm the MIC Needs power support when working The MICBIASP N port of the baseband chip supports bias Volta...

Страница 16: ...1 Receiver Figure 3 2 5 Circuit of receiver 2 Louder speaker Figure 3 2 6 Circuit of louder speaker U n R e g i s t e r e d ...

Страница 17: ...Handset microphone Earphone Figure 3 2 7 Circuit of MIC bias voltage circuit of mobile phone 4 Hands free microphone Figure 3 2 8 Circuit of Hands free microphone 3 2 5 LCD circuit U n R e g i s t e r e d ...

Страница 18: ...nd four control bus LPCEOB_MAIN_LCM is chip select signal LPA0 is select bus for register and commend LWRB is LCD writes strobe LRDB is LCD read strobe LRSTB is reset signal LCD is controlled by baseband IC Display data is transferred to video RAM in LCD driver by I O port in DMA mode So system Can response quickly and multimedia runs fluently without mosaic or picture feeling Three Common anode L...

Страница 19: ...3 2 8 T Flash circuit T Flash card interface VDD is supplied by MT6253 3 2 10 FM U604 is the FM chip to supply the function of FM radio U n R e g i s t e r e d ...

Страница 20: ...y interface When key is pressed down the matrix KCOLX status is pulled down to low Interrupt occurs Then Baseband can judge the key s location so system implements corresponding function U n R e g i s t e r e d ...

Страница 21: ...ltage For RF signal we usually use spectrum analyzer to check signal Spectrum and amplitude in frequency domain We provide a useful phone maintain software META Some introduction about META will be Showed below 4 1 Analysis of base band failures 4 1 1 The handset can not be power on Interrelated components are mainly as below PMIC Baseband chip MT6253 MCP Flash RF Transceiver MT6253 26MHZ VC TCXO ...

Страница 22: ... good one Second you go to the test item echo and test MIC Huff at MIC then there will be an echo at receiver that shows the microphone is ok Otherwise you must check the microphone bias circuit test bias voltage and output signal Microphone resistance should be 2 2k OHM 4 1 6 No voice in speaker First you can check if the audio source can output from baseband chip with a headset Then check speake...

Страница 23: ...saw filters matching circuit etc You need to check if one of them is bad soldering or damaged If power received is too low maybe the RF circuit is cut off you need to check saw filter matching circuit and antenna Switch and control signal etc If the bit error is too high it may be because the saw filter is not Qualified RF transmitting circuit associated components is mainly as below base band MT6...

Страница 24: ...e window as below 2 Click File first click Open Download Agent choose CUSTOM_AllInOne_DA in a Pop up window then click Open Scatter loading file choose scat At last click ROM Then you can select the software usually saved as a bin file which you want to download U n R e g i s t e r e d ...

Страница 25: ...oose Auto Format FAT in a pop up window Other settings you can leave them as software default 5 Download Then connect cable with handset and power on the phone The progress bar will move and begin downloading You need to wait for a few minutes picture as below 6 Downloading succeeds when the below picture occurs U n R e g i s t e r e d ...

Страница 26: ...are please save all information and phone numbers in the handset After the software is downloaded the handset will delete all the information and restore to the factory default software environment 5 3 CKT maintain software introduction META 5 3 1 META RF TOOL Step 1 Open Maui META and select correct COM port META status window shows Please reset target otherwise if it is in Connect with target st...

Страница 27: ...5 3 2 The features of META RF Tool PM PM is used for measuring the receiver Rx level at a given RX channel U n R e g i s t e r e d ...

Страница 28: ...result of Power At first you should configure the Universal wireless communication tester such as Agilent 8960 or R S CMU200 please follow the below picture for your configuration guide U n R e g i s t e r e d ...

Страница 29: ... If you have not loaded the correct database file yet META will notice you to open a database Please follow it and then you will see the target RX path loss parameters for different channels in the AGC path loss window Please note that all the RX loss values should be in the tolerance range of 5dB otherwise it Should be a hardware failure U n R e g i s t e r e d ...

Страница 30: ...le should be about 70dbm tolerance 5dB Otherwise it means there is some defect with RX path Please Check the GSM RX SAW and the surrounding circuit like ASM and RF test connector For DCS PCS band do the same operation except for the band select and the 8960 band settings Note that the ARFCN should be the same setting as the 8960 Broadcast chan U n R e g i s t e r e d ...

Страница 31: ...file TX level and profile is intended for checking the Transmitter s output power ramping profile at a given channel and power control level TX level and profile TSC 为 5 Set the 8960 to non signal mode U n R e g i s t e r e d ...

Страница 32: ...Set Expect burst TSC code of 8960 the same as META indicated CONFIDENTIAL Set 8960 Traffic band for EGSM Traffic Channel to 20 MS TX Level 5 and wait for receiving U n R e g i s t e r e d ...

Страница 33: ...the MS burst Press GMSK level and ramp setting button into GMSK APC profile setting page U n R e g i s t e r e d ...

Страница 34: ...Follow below setting page the set the corresponding TX parameters ARFCN TSC PCL DAC etc Then click Start button to start transmitting burst U n R e g i s t e r e d ...

Страница 35: ...If the Target MS TX function is OK you may see a TX PVT profile from the 8960 as follows U n R e g i s t e r e d ...

Страница 36: ...ndow please follow below debug wizard to check and remove all the failure about TX path 1 First of all we use oscilloscope to check PA TX enable control signal waveform PA_EN The normal case shows below Otherwise please check Baseband circuit U n R e g i s t e r e d ...

Страница 37: ...GSM LEV5 Chapter 6 Tools List 5 1 Downloading Operation Manual Reference Flash_tool exe 5 2 Write SN Operation Manual Reference Maui META ver 6 0952 0 5 3 Calibration Operation Manual Reference Maui META ver 6 0952 0 U n R e g i s t e r e d ...

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