texet X-Navi, Service Manual

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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.