Production Calibration; Afc Calibration - Lenovo A516 Service Manual

Repair Manual of Lenovo A516 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?
Check whether
（ U2104 ） is oppositely
pasted?
Check whether
（ U2104 ） is in cold solder
joint?
Recalibrate
Check whether there is power
output from PA (U2102)
⚫
Notes: Remember to recalibrate after replacing elements.
N
Y
Y
TCXO
N
Y
N
TCXO Y
N
Reconnect and calibrate
Re-weld U2104
Re-weld U2104
Replace PA（U2102）
27