FLY EZZY Manuel utilisateur
.
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
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