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I908 Mobile Phone Maintenance Manual
4.2 Production Calibration
4.2.1 AFC calibration
Problem：AFC calibration failed.
Causes: RF test cable is not connected properly during calibration; the crystal and its
peripheral circuits (AFC power supply) have been fitted the wrong way round or there are
problems with the soldering points.
Solution:
AFC calibration
failed
Check whether or
not the RF wire and
Check whether the
crystal（X2101
Check the crystal (X2101) for
possible pseudo soldering
Check whether there is
power output from U2102
Y
Recalibrate
Please note: Calibration usually has to be repeated after the assembly (assemblies) has
(have) been replaced.
N
Re-connect and
Y
Y
Re-solder X2101
） has
N
Y
Re-solder X2101
N
N
Replace PA (U2102)
LENOVO
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