Fly F241 Service Manual
F241
Service Manual
Document Type : Maintenance Training
Document Name : X55 Service Manual
Version : 1.0
Date：2015/05/12
1 PRODUCT CHARACTERISTIC.............................................................................................................. 1
1.1 OVERVIEW............................................................................................................................................... 3
1.2 FUNCTIONS..............................................................................................................................................3
1.4 MAIN-BOARD PLACEMENT...................................................................................................................... 4
2 CIRCUIT......................................................................................................................................................5
2.1 SYSTEM OVERVIEW................................................................................................................................. 5
2.2 AUDIO CIRCUIT..................................................................................................................................... 7
2.3 LCD MODULE......................................................................................................................................... 9
2.4 BATTERY AND CHARGER......................................................................................................................... 9
2.5 RF MODULE.......................................................................................................................................... 10
2.6 BLUETOOTH AND FM............................................................................................................................12
3 TROUBLESHOOTING............................................................................................................................ 13
3.1 LCD MODULE....................................................................................................................................... 13
3.2 RING AND VIBRATOR.............................................................................................................................15
3.3 CHARGE CIRCUIT.................................................................................................................................. 17
3.4 KEYPAD AND BACK LIGHT.................................................................................................................... 18
3.5 CALLING............................................................................................................................................... 20
3.6 POWER ON FAILURE.............................................................................................................................. 22
3.7 DOWNLOAD FAILURE............................................................................................................................ 23
3.8 DETECT EARPHONE FAILURE................................................................................................................. 24
3.9 ADC FAIL AND ADC SLOPE FAIL.................................................................................................... 25
3.10 RF TROUBLESHOOTING....................................................................................................................... 26
3.11 BLUETOOTH TROUBLESHOOTING........................................................................................................ 28
3.12 FM TROUBLESHOOTING......................................................................................................................29
2
1.Product Characteristic
GSM900/DCS1800;
Supports 2.40QVGA
Supports digital camera;
Supports MP3 music;
Supports MPEG4 format movies;
Extensible Memory: T_FLASH card;
Supports longtime sound record;
Earphone connector;
Electric torch;
Supports MMS;
64-chord ring;
Short message;
Many games integration;
Rings, volume, desktop individuation setup.
1.1 Overview
FF241
is dual-frequency mobile main-board. It supports 2.4.0QVGA LCD module,
digital camera and MMS module, 64-chord ring, MP3, USB and many kinds of
useful functions – multi-language input, phone note, ck/alarm clock,
calculator, games，FM radio，Bluetooth.
1.2 Functions
FF241
main-board system overview:
3
1.4 Main-board placement
MB_
Bottom
Battery
connector
CPU
MT6261
26MHZ
RF PA
3.5 earphone
connector
SIM,T-Card
5PIN USB
connector
TOP
Camera
LCM
4
2 Circuit
2.1 System Overview
MT6261A is a monolithic chip integrating leading edge power management unit,
analog baseband and radio circuitry based on the low power CMOS process.
MT6261A is a feature rich and extremely powerful single chip solution for
high end GSM/GPRS capability. Based on the 32 bit ARM7EJ-S RISC processor,
MT6261A superb processing power, along with high bandwidth architecture and
dedicated hardware support, provides a platform for high-performance GPRS
Class 12 MODEM application and leading-edge multimedia applications.
5
A power management is embedded in MT6261 to provide the rich features that
a high-end feature phone supports, including Li-ion battery charger, high
performance and low quiescent current LDOs, and drivers for LED and
backlight.MT6261 offers various low-power features to help reduce system
power consumption.MT6261 is also fabricated in an advanced low-power CMOS
process, hence providing an overall ultra-low Leakage solution
6
2.2 AUDIO circuit
Speaker:
Receiver:
7
MIC:
8
Earphone
TFT mode: 2.4”QVGA
Resolution: 240×320Dot
Back light mode: Write LED
：
2.3 LCD module
9
2.4 Battery and charger
(1) Battery
The Li-on battery is advised, 3pin.
Dimension and capacity is decided by mechanism solution.
(2) Charge process
The switch charger is recommended for X55 with USB cable can be used too.
The charge process is optimized for Li-on battery specially that include
pre-charge, constant current charge and constant voltage mode. It can protect
battery and extend usage life of battery.
10
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