Fly EZZY 5 Service manual

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FLY EZZY5

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

Chapter 1: Summary

Standby time: 150~200 hours

Talking time: 300~450 mins

Style of network

GSM900, DCS1800

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

Excellent craft. Besides the basic call function, FLY Ezzy5 provides you with a collection of
practical Functions including sweet ring tone, cartoon incoming-call animation, File manager

(T-Flash card support). It also supports MMS and increment service which facilitate your
work and entertainment.

In order to support technicians to be familiar with FLY Ezzy5 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 specification and technique standards of FLY Ezzy5 are as below:

Chapter 2: Exploding Diagram

The main board placement

Chapter 3: Explanation of Schematic

Picture 3.1 MT6260 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 .

RF Circuit deals with the RX and TX of wireless signal, with responsibility for the bidirectional
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. 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 part is mainly composed of a highly integrated CMOS

Transceiver chip (MT6260), some RX Saw filters, reference crystal oscillator, power amplifier,
Antenna switch module, antenna and the matching components between each other...

3.1.2 Direct Conversion Receiver

-Differential LNA

-Integrated Active RX Channel Select Filters -

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 Quadrature modulator

TX PA: RF7176

TX PATH:

3.14 26MHz Clock:

-The entire system including VCO, tank, fractional N dividers, sigma delta compensation, charge
pump and loop filters are fully integrated.

-The only external component is the frequency reference

26MHz Clock Reference Circuit

3.1.5 High performance multi band PLL system

-Fast Fractional-N Synthesizer

Integrated Local Oscillator VCO -Fully Integrated Loop filters

-Crystal Reference Oscillator & Tuning System

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3.1.6 Power Management

-Integrated LDO sallow direct battery supply connection

3.1.7 Frequency ranges

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

The frequency ranges of the synthesizer for RX mode

TX mode

EGSM900 880.2MHz ~ 914.8MHz
DCS 1800 1710.2 MHz ~ 1784.8MHz

3.1.3 MT6260 Function Block Diagram

3.2Principle of base band circuit

3.2.1 Whole introduction of base band circuit

3.2.2 Explanation of power circuit and in-and-out circuit

Power source is provided by MTK MT6260 and periphery components, main function as below:

A. 2.8V-5.5V Input Range
B. Charger input up to 8V
C. Seven LDOs optimized for specific GSM Sub-systems

D. One LDO for RF transceiver
E. High operation efficiency and Low stand-by current

F. Li-Ion battery charge function
G. SIM Card interface
H. Two open-drain output switches to control the LED and vibrator
I. Three NMOS switches to control RGB LEDs
J. Thermal Overload Protection
K. Under Voltage Lock-out Protection
I. Over Voltage Protection
M. Power-on Reset and Start-up Timer

1． power supply

high. At that time, the power

MT6260 power supply:

2、power on/off circuit

After the handset power off, the pin PWRKEY is pulled high. The pull-up resistance is

Charge Circuit

inside the chip .When the power key is pressed, the pin PWRKEY is pull low, then the
MT6260 turn on all the Power supply function and the baseband chip enter working status.
So the pin BBWAKEUP is pulled high. At that time, the power key can be released; the
CPU-baseband chip can control the MT6260 .

MT6260 charge

management function:
1、Charger detection

2、Battery voltage measurement
3、Charging current measurement

4、Over voltage Protection
5、Charge mode selection

MT6260 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.

The charge process include three states: pre-charging mode, constant current
mode and constant voltage Mode. If the battery voltage is bellow 3.2V, the
handset enter pre-charging mode; If the battery voltage is over 3.2V, it enter the
constant current mode.

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3.2.3 SIM interface

SIM interface circuit

The power management chip supply the interface between the SIM card and

baseband chip, the Key signal is: SIM_CLK (the clock signal), SIM_RST (the reset signal),
SIM_I/O (I/O signal), VSIM (SIM power supply).

3.2.4 Principle of audio frequency circuit

The Audio Frequency (AF) circuit includes three parts: RECEIVER and SPEAKERs,

HANDSET MIC, ERAPHONE and HANDFREE MIC.

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

Voltage for Mic. The EARPHONE port is dual-used with the USB port. For more details Please
refer to "communication ports" in later part.

There are 4 speakers; each speaker is drove by an AF amplifier. The baseband chip sends

1、Receiver

Figure 3.2.5 Circuit of receiver

2、Louder speaker

Figure 3.2.6 Circuit of louder speaker