FLY EZZY Manual de usuario

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FLY EZZY

SERVICE MANUAL

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

ction of practical

ort). It also supports MMS and increment service which facilitate your work and

description of circuit. You can refer to maintaining

Main specification and technique standards of FLY EZZY are as below:

Standbytime:

Styleofnetwork

160-240 hours-

GSM900, DCS180

Chapter 1: Summary

This streamline and comfortable handset is a perfect combination of humanized design and

Excellent craft. Besides the basic call function, FLY EZZY provides you with a colle

Functions including sweet ring tone, cartoon incoming-call animation, File manager

(T-Flash card supp

entertainment.

In order to support technicians to be familiar with FLY EZZY 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

examples. Hope it could give you some help.

Talking time: 160-200min

Chapter 2: Exploding Diagram

The main board PCB

The main board placement

Chapter 3: Explanation of Schematic

MTK6223A

AD6548

MTK6223A

Picture 3.1 MT6223A 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、

TX path、RX path、Analog modem and Frequency Synthesizer.

nal

he

Perfo ile phone!

mplifier,

nd the matching components between each other...

ion Receiver

n Baseband Amplifiers

–Th receive path

RF Circuit deals with the RX and TX of wireless signal, with responsibility for the bidirectio

Transmission of speech and data between the MS and BS through the air interface. In detail RX part

Accomplishes the AGC amplifying, mix and demodulation of RF weak signal received from BS, The

Final signal output from RX part is the analog baseband I/Q signal. The final RX I/Q will be sent to

Baseband Circuit for later disposal. On the other hand TX part deals with the signal modulation,

Up-conversion mix and power amplifying of analog I/Q signal received from baseband, generating

Burst which 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. T

rmance of RF Circuit can directly affects the signal transmission quality of the mob

The schematic of RF block for MTK GSM Dual-band RF solution is show below:

From the chart we can see that the RF part is mainly composed of a highly integrated CMOS

Transceiver chip (AD6548), some RX Saw filters, reference crystal oscillator, power a

Antenna switch module, antenna a

3.1.2 Direct Convers

–Differential LNA RX Channel Select Filters–Integrated Active

–Programmable Gai

e

RX Saw filter Circuit

3.1.3 Translation Loop Direct VCO Modulator

–Integrated TX 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

CO, tank, fractional N dividers, sigma delta compensation, charge pump and

The only external component is the frequency reference.

26MHz Clock Reference circui

d PLL system

TX PATH:

3.14 26MHz Clock:

–The entire system including V

loop filters are fully integrated.

–

3.1.5 High performance multi ban

–Fast Fractional-N Synthesizer

Integrated Local Oscillator VCO

ters

.1.6 Po

Integrated LDOsallow direct battery supply connection

3.1.7 Frequency ranges

The frequency

TX mode

EGSM900 880.2MHz ~ 914.8MHz

DCS1800 1710.2 MHz ~ 1784.8MHz

–

–Fully Integrated Loop fil

–Crystal Reference Oscillator & Tuning System

3 wer Management

–

The frequency ranges of the synthesizer for RX mode:

RX mode

E-GSM 900 925.2MHz ~ 959.8MHz

DCS 1800 1805.2 MHz ~ 1879.8MHz

ranges of the synthesizer for TX mode