I360 Mobile Phone Maintenance Manual v0.1
5.2.3.3 EGSM/DCS Reception Troubleshooting
The reception troubleshooting steps are illustrated in the diagram given below.
Check Pin 10 of FE600 for possible signal absence
Replace U602
Check the control signals of Pins 18, 19 21 and 22 of
U602 are right or not
Check the control signals of Pins 1 and 6 of FE600 are
right or not
Check antenna
Check baseband
Solder
again
Check the circuit
adaptable between
FE600 and U602
for possible pseudo
soldering
Replace the elements of
circuit adaptable
Check U602 for possible pseudo soldering
No I/Q signals had been received upon device inspection
Solder again
YES
NO
5.2.3.4 26MHz Reference Clock Waveform
LENOVO Lenovo Mobile Telecommunications Co., Ltd.
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