Voxtel W420, Руководство по ремонту

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3
2. General character
2.1. Product description
W420 mobile phone is full duplex, using digital demodulation technology, controlled by microprocessor.
Support 900MHz/1800MHz/1900MHz cell radio system compatible and GPRS. Handset provide land connect
telephone service to user through single base station when using it correct. All the base stations connect to a
centre control room.
Primary chips in W420 contain below (according to the way of encapsulation)
BGA encapsulation
：
OMAP730
－
DBB(DBB
－
Digital BaseBand,encapsulate CPU and DSP manage
function)
、
TWL3016B2GQW
－
ABB(ABB
－
Analog BaseBand
，
providing the interface between system analog
and digital signal, and power manage function)
、
K4S51163PF-Y(P)F75 Memory(8M x 16Bit x 4 Banks
Mobile-SDRAM);
、－
MD4832-D512-V3Q18-X Memory(512Mbit Flash)
、和
BC41B143AXX-IXB-E42
－
Single
Chip Bluetooth
；
QFN encapsulation
：
TRF6151BRGZR
－
TRANSCEIVER
、
BQ24020DRCR-smart charge
Special encapsulation: RF3133
－
PA
、
Radio Frequency and Base band in W420 is isolated by screen, micro SIM card box is protected by the
battery
W420 has the same power step as usual
Radio Frequency circuit of antenna on the top of the mobile phone will cut automaticly when W420 using
RF accessory plug
2.2. Introduction of character and function
Character:
Supporting trio band
：
The mobile phone can automatic switch in GSM900 network, DCS1800 network and
PCS1900 network. Choose best channel for calling. The mobile phone can also automatic switch during the
call without disturbing users. And the ratio of connecting improves with the automatic switch. Using trio method
GSM900
／
DCS1800/PCS1900 networks
，
not only ease up the high dense radio channel, but also provide
wilder users for network operation vendor. Both user and operation vendor gain more benefit. Using of GPRS
（
General Packet Radio Service
）
change the mind of GSM network, which can provide more than circuit
switch, It can combine mobile communication with digital network together through add corresponding function
entities and limited changes about network. Import IP service in wild mobile market, bring wilder and faster
message space for mobile phone user too
Function
：
GSM900/1800MHz/PCS1900 automatic switching
Full-rate/enhanced full-rate/half-rate coders
GPRS Class 12
Inter antenna
260K color 2.8” TFT display screen, 176
×
220
Inter 200
，
0000 pixel camera
64 tones ring bell
Microsoft operation system
Enhanced phone number book
WAP Explorer Ver 1.2.1
MMS/SMS
Inter 2Games
Inter ring bell and wallpaper
ZI Chinese input
Blue Tooth
MP3;MPG4
STK Service
Infrared function