Lenovo A859 Service Manual - Page 24

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Lenovo A859 Service Manual
Repair Manual of Lenovo S920 Mobile Phone

4.2 Production calibration

4.2.1 AFC calibration

Fault: AFC calibration Fail.
Reason: RF test cable is not connected well during calibration; TCXO is oppositely pasted
or in cold solder joint.
Shooting:
AFC calibration
Fail
Check whether RF cable and
fixture is well connected?
Y
Check
whether
TCXO
（ U2104 ） is oppositely
pasted?
N
Check
whether
（ U2104 ） is in cold solder
joint?
N
Check whether there is power
output from PA (U2102)
N
Recalibrate
Notes: Remember to recalibrate after replacing elements.
N
Reconnect and calibrate
Y
Re-weld U2104
Y
Re-weld U2104
TCXO
Replace PA（U2102）
Y
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