FLY G1 Service Manual
Service Manual
Version：V1.0 Effect date：2009-12-17 NO. internal：V1.0
Security level： High Edition：V1.0 Department：HW
Pages： 38 Text： Addenda：
Made by： Checked by： Approval：
Document NO.：
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AMENDMENT HISTORY
S/N Rev Description of Change Date Originator Check Approval DCR No.
1
2
3
4
5
6
7
8
9
10
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CONTENTS
．PREFACE…………………………………………………………….……………………………….. 5
1
1.1 Purpose and scope……………………………………………………………………………………5
1.2 safety regulations……………………...………………………………………………...…………….5
2.Characteristics………………………………………………………………………………...…. …...5
2.1 Production description………………………………………………………….……..………………5
2.2 Characteristic &function introduction…………………………………………….….………………6
．Reference parameter ………………………………….…………………..….….…. ……………7
3
．Mark and security……………………………………………………………………………….…….8
4
4.1 Mark…………………………………………...…….…………………………………………….……8
4.2 SIM card……………………………………………………………………………………….…...…10
5
．GSM system introduction………………………………………………………………..………..10
5.1 The History and Development of GSM System………………………………….……….……....11
5.2 GSM system configuration…………………………………………...………………........….……12
5.3 GSM air interface………………………………………………………….…......……………...…..13
5.4 Subscriber Identify
……………………………………………………………………………...……..15
5.5 Voice coding and transmission………….…………………………………………………………16
5.6 Logical channel………………………………………………………..……………………………..17
5.7 Calling establishing procedure……………………………………………………..……..………..18
5.8 GPRS introduction……………..……………………………………………………….……………18
6. G4 Circuit………………….…………………………………………………....….....….18
6.1 Receiver Circuit…………………….…………………….…………………….………...………….18
6.2 Transmitter Circuit…………………………………………………………………………………...21
6.3 CPU.………..…...…………………………………………………………...……………………….22
6.4 Memory…. …………………………………………………………………………………………...23
6.5 Power management、battery monitor and SIM card interface……………………………….…23
6.6 Display.………......……………………………….…………………………….…….…….………...27
6.7 keyboard backlight……………………………..……….…………………….…...………..……….27
6.8 Vibrator..……………………….…………………………………………….….…...………………..28
6.9 audio interface………………………...………………………….………………….....…………....28
6.10 power on/off and hang up…………………………………………………………..……………...29
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6.11 Motion sensor circuit…………………………………………………………..…………………...29
7
．PCB failure………………………………………………………………….……....…….…….……30
7.1 Phone malfunction repair……………………………………...………………..…………...…..….30
7.2 PCB failure………………………………………………………………………..…..…..………….32
8
．Reference information ……………………….……………………………………………...….….33
8.1 Reference Value……………………….………….…………………………...……….....…………33
8.2 Analysis equipment and tools …………………………………………………………………..35
8.3 Caution……………………………………….…………………………………………..…………...35
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1. PREFACE
1.1 Purpose and scope
Only experienced technical person can use this manual, it is reference for G4 servicing.
1.2 Safety regulations
For personal and public safety
Avoid to contact with bareness part of the body directly, especially eyes and face. Please
hold the mobile above shoulders, the efficiency will be higher.
Strictly prohibit used on plane, for disturbing aviation communication and navigation
system.
Strictly prohibit in explode field for radio signal disturbing, please pay attention to no
wireless launch circumstance.
Strictly prohibit used in gas station or explode gas area, for electromagnetism resonance
disturbing.
Strictly prohibit used in hospital or around electrical medical treatment equipment, for
disturbing instrument.
Strictly prohibit used when driving. If use hands free function, there should be a antenna
outside of the car.
Strictly prohibit used by babyhood. Some human being such as pregnant woman、
serious neurasthenic person、 heart pacemaker patient should pay more attention to use
mobile phone.
2. General characters
2.1 Production description
G4 is controlled by micro controller, full duplexer, digital demodulation wireless mobile phone.
It is compatible with both 900MHz and 1800MHz system. When it is working, the handset
communicate with single base station, all the base stations are controlled by a central controller.
Main IC of G4: (sorted by package)
BGA：MT6225－CPU，
TV00670002ADGB －FLASHROM&SRAM.
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MT6318－PMU
QFN：， MT6139－transceiver.
The RF and BB parts of G4 are sepa rated by individual met al shielding, SIM card connector
is covered by battery.
G4 RF power level is same as traditional GSM mobile phone.
2.2 Characteristic &function introduction
Feature:
G4 is mobile phone of automatic switch dual band, which could switch freely between
GSM900/DCS1800, choosing the best channel to communicate. Customer would not feel the
switch between 2 bands even in calling. Connecting successful rate is improved for mobile phone
chooses the best channel. This automatic switch mode relax es the task of wireless channel in
regions, which have high traffic density, and operator could accept wider customers.
Function introductions:
GSM900/DCS1800 dual band
Full speed rate/enhanced full speed rate/half speed rate encode
Internal PIFA antenna
Powerful contac t list, which could store 100 telephone numbers
320 x 240 pixel 2.4" TFT LCD
Idle time>300 hours, talk time>5 hours
Internal ring tone, wallpaper
Calendar, schedule, notepad, vibrator, alarm clock
Thai and English input
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3. Reference parameter
Functions EGSM technology parameter DCS technology parameter
Frequency range Sending frequency 880-915
MHz
Receiving frequency 925-960
MHz
Receiving frequency 1805-1880
Sending frequency
1710-1785MHz
MHz
Channel interval 200 KHz
Channel 124 channels, each with 8
time slots
Modulation
Sending phase error
RMS 5°, PEAK 20° RMS 为 5°, PEAK 20°
GMSK ( BT ＝ 0.3)
374 channels，each with 8 time
slots
Full duplex interval 45 MHz 95 MHz
Frequency stable
±1ppm ±1ppm
rate
Working voltage
Sending current
Antenna resistor
Battery voltage：3.7V
Operating voltage：3.4～4.2V
Peak current〈1A Peak current〈1A
50Ω 50Ω
Battery voltage：3.7V
Operating voltage：3.4～4.2V
Antenna VSWR <1.5 <1.5
RF conduct output
Maximum 2W Maximum 1W
power
SIM Insert mode
Temperature range
RF radiate output
33 dBm +/- 2dBm 30 dBm +/- 2dBm
-10°C~ +60°C
power
Radiated spurious
emission
-36 dBm when <1GHz
(<-30dBm when > 1GHz )
-36 dBm when <1GHz (<-30dBm
when > 1GHz )
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RF voltage -102 dBm -102 dBm
Receiving BER(100
< 2% < 2%
kbits )
Channel hopping
500uS
time
Access time About 10 seconds
Speech encoding
type
Regular pulse active /forecast coding in long time (using RPE of
LTP)
Bit rate 13.0 kbps
Lasting time of frame 20 ms
Code group rate 260 bit
Class
Bit rate of forward
Class 1: 182 bit，Class 2: 78 bit
22.8 kbps
error correct coding
4. SIM card security
1） SIM card introduction
SIM is the abbreviate of Subscriber Identity Model . SIM card is always called smart card or
user identity. Digital mobile phone could not be used without this card. SIM card has 3 materials
inside: surface metal circuit board, I C, hard black protect glue. The surface metal ci rcuit board
takes charge of information communication between IC and mobile phone. The hard black
protect hard glue is only for IC protection for this IC the core of SIM card. It stores the
customer record of digital mobile phone, encryption key, which could be used in, distinguish of
customer identity and do speech encryption during the call. The metal circuit board has 6 blocks
each response for mobile phone input record, speech, operator command.
The use of SIM card prevents the call merging and wiretapping, and SIM card is produced
according to the GSM international standard and regulations. It gi ves a reliable protection on
customer’s normal communications. The use of SIM card also makes the card and mobile
phone separated, one SIM card identify one customer. Any one SIM card could be inserted and
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used in any GSM mobile phone and the fees caused by this phone would recorded on the bill of
the only customer which this SIM card correspondi ng t o. S IM card contains the al l t he pers ona l
data when request GSM service, including:
International Mobi le Equipment Identity
Temporary customer identification
Main system
Registration
PIN and unlock code
Call limit code
Personal data stored by customer, such as messages, certain telephone number,
function setting, fees record and so on
2）Security functions
Customer could use security functions in mobil e phone to lock his SI M card to prevent other
person use this SIM card. The PIN number is request when unlock it. Personal ident ity number
has 4 digits and is set by customer. This pin is for SIM card and used t o protec t t he SIM card and
the initial status is non-active. If this function is activ e, GSM and mobile phone would do automatic
identification when phone power on. This identification would judge the validity of SIM card.
System would provide ser vice only when this card is valid. Ther e are 3 opportuniti es to enter the
PIN. If wrong PIN number for 3 times, SIM card woul d bloc k i ts elf and onl y unbl ock ed wh en enter
correct PUK number. PUK（PIN Unblocking Key）is used to unblock the PIN number and each SIM
card has its own PUK number which has 8 digits . It could be manag ed by customers themselves
or network operator. At present, most of mobile phone office offers P UK checking and c ustomers
could manage PUK themselves. Customer would have 10 opportunities to enter the PUK number.
If wrong PUK is entered for 10 times, SIM card would start the self -ruin program to make itself
invalid. At this situation, customer need apply a new S IM card. It’s highly recommend that do not
try to unblock SIM card when do not have correct PUK.
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Another security action is setting call limit. Call limit means that user could set pin, limit
incoming call and out coming call. Users could set and unset the call limit to avoid receiving
unknown call or being used by other person, especially for the international call. 4 digi ts pin is
needed to set this call limit. The initial pin is 0000. User should modify this pin when open call limit
service to improve security. Call limit could be set by mobile phone’s menu or by encoding
method. These two setting is similar. What should pay attention is call limit service only provide to
the user who has opened the international call, and this service could not be used with call
transfer service.
5. GSM system introduction
5.1 GSM history and development
The earliest mobile phone service comes from St.Louis. After more than 30 years research
and development, especially with the rapid development of semiconductor , mobile communication
service has achieved a huge development in both technology and scope. The analog mobile
communication system which is characterized wit h AMPS, NMT, TACS established. In early 90s,
coming with the increase of mobile communication users, the requirement of multi-region,
multi-national service and other increment service also increased. At the same time, technology of
digital communications has grown up. European m obile phone oper ator began to c onsider a new
digital mobile communication system. GSM m obile communication system has come out.
GSM system is designed for a mobile communication stand for whole European. It’s the first
digital communication system and could support roaming in European. GSM is the most
successful commercial mobile communication system and adopted by many countries in the
world.
During the development of GSM system, several communication systems come out. The
earliest GSM system is called PGSM and the EGSM system is established by extending the
frequency band. DCS（Digital Communication System）is established by changing the working
frequency band. The GSM system in North America which is called PCS （ Personal
Communication System） also c hanges its work ing frequency band. All the GS M system mobil e
communication system only has some difference on wo rking frequency and output power, while
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the RF modulation method is the same.
5.2 GSM system configuration
The composition of mobile communication system is similar and always made up of following
main parts.
1） NSS（Network Sub System）
Network Sub System is made up of MSC (mobile switching center), operation maintain center
and HLR (home location register), VLR (visitor location register), certification centre and
equipment symbol register. MSC is the core of cell communication network. It is responsible
for the data transitions and exchange of the whole mobile communication s ystem, network
management and connection with other communication systems. MSC also identifies the
user’s identity, updates the user location and router the communication path. Many other
functions provided by system should be done by MS C.
2） BSS（Base Station System）
BBS is responsible for connection between MSC and MS. BS should has the fixed wire or
wireless connection mode with MSC and the wireless connection mode with MS. Each BBS would
cover a cell region, and phones inside this region could make communications with this BBS. BBS
would control and manage the communication status of thes e mobile phone, including frequ ency,
power, time sequence. If the mobile phone is moved to another region, it would switch the region
under the control of BBS.
3） MS（Mobile Station）
MS confronts with the user’s terminal equipm ent, i.e. handset or car kit. The MS is physical
equipment and should contain SIM card. Both SIM and hardware equipment make up MS.
Without SIM card, MS could not access GSM network (exc ept emergency service)
5.3 GSM air interface
In GSM mobile communication system, the transmission between MS and BS is RF
communication. Here is a brief introducti on about air RF interface of GSM system
1） Frequency distribution
The uplink frequency band of PGSM system is 890MHz~915MHz and the downlink is
935MHZ~960MHz. The full duplex i nternal is 45MHz.
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