Lenovo I360 Maintenance Manual page 27

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