texet X-Navi Service Manual
TEXET X-Navi
Smartphone
Service Manual
(This document is only for reference)
CONTENTS
• Specifications
• Safty Precautions
• Product Function
• Block Diagrams
• Chart of Troubleshooting
• PCB Diagrams
• SCH Diagrams
Specification
General Specification
GSM850
EGSM900
DCS1800
PCS1900
WCDMA1900
WCDMA850
Freq.Band[MHz]
Uplink/Downlink
824-894MHz
880-960MHz
1710-1880MH
z
1850-1990MH
z
1850~1910
1930~1990
824~849
869~894
ARFCN range
128~251
0~124 &
975~1023
512~885
512~810
9262-9538
9662~9938
4132-4357
4357~4458
Tx/Rx spacing
45MHz
45 MHz
95 MHz
90MHz
80 MHz
45 MHz
Modulation
0.3GMSK
0.3GMSK
0.3 GMSK
0.3GMSK
BPSK
BPSK
MS Power
<33dBm
<33dBm
<30 dBm
<30 dBm
<24dBm
<24dBm
Power Class
4
4
3
3 3 3
Cell Radius
35Km
35 Km
2 Km
2 Km
800m
1Km
Safety Precautions
Repair Precaution
● Repair in Shield Box, during detailed tuning.
Take specially care of tuning or test, because specificity of cellular phone is sensitive for
surrounding interference(RF noise).
● Be careful to use a kind of magnetic object or tool, because performance of parts is
damaged by the influence of magnetic force.
● Be surely use a standard screwdriver when you disassemble this product, otherwise
screw will be worn away.
● Use a thicken twisted wire when you measure level.
A thicken twisted wire has low resistance, therefore error of measurement is few.
● Repair after separate Test Pack and Set because for short danger (for
example an overcurrent and furious flames of parts etc.) when you repair
board in condition of connecting Test Pack and tuning on.
● Take specially care of soldering, because Land of PCB is small and weak in heat.
● Surely tune on/off while using AC power plug, because a repair of battery charger is
dangerous when tuning ON/OFF PBA and Connector after disassembling charger.
● Don't use as you pleases after change other material than replacement registered on
SEC System. Otherwise engineer in charge isn't charged with problem that you don't keep
this rules.
ESD(Electrostatically Sensitive Devices)
Precaution
Several semiconductors may be damaged easily by static electricity. Such parts are called
by ESD (Electrostatically Sensitive Devices), for example IC,BGA chip etc.
Read Precaution below, You can prevent from ESD damage by static electricity.
● Remove static electricity remained your body before you touch semiconductor or parts
with semiconductor. There are ways that you touch an earthed place or wear static
electricity prevention string on wrist.
● Use earthed soldering steel when you connect or disconnect ESD.
● Use soldering removing tool to break static electricity. Otherwise ESD will be damaged
by static electricity.
● Don’t unpack until you set up ESD on product. Because most of ESD are packed by box
and aluminum plate to have conductive power, they are prevented from static electricity.
● You must maintain electric contact between ESD and place due to be set up until ESD is
connected completely to the proper place or a circuit board.
Product Function
• Smartphone, 1.2GHz CPU
• Android 4.2
• 4.5” WVGA LCD with CTP
• 32 GB (4GB) EMMC+4GB (512GB) DDR2
• 2G Dual band (GSM900/DCS1800) + WCDMA900/1900/2100
• Camera and Video with Flash LED
• Music player
• Speaker
• Calendar
• Web browser
• Dual SIM Card
• T-flash Card Up to 32GB
• BT& FM& WIFI&GPS
• 3D accelerator sensor
• USB2.0
Block Diagrams
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