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I908 Mobile Phone Maintenance Manual
Problem：PCL Calibration failed.
Causes: RF test cable is not connected properly during calibration; PA has been attached the
wrong way round; PA and the surrounding circuits have soldering-point problems; chips on
the RF input circuits of the PA are displaced. Circuits are short connected with the shielding
frame.
Solution:
Did the
GSM
Y
Sold
There
er
soldering
L21
Sold
Y
Is there any
er
pseudo
Z210
soldering
the PA input
Z2103?
Please note: Calibration usually has to be repeated after the assembly (assemblies) has
(have) been replaced.
Problem2:
Problem: Phone power output too high
Causes: This is usually due to the wire not being connected properly during calibration.
Solution:
PCL calibration
N
Check
calibration report
N
Did the DCS
f
f il?
Y
Y
Y
is
Is
there
soldering
N
at
Power too high
Check the RF wire and
clip. Ensure that they
Re-connect
LENOVO
Y
the
Check whether
or not the RF
Replace
Is
there
L2107
pseudo soldering
Did
(U2102)
Is there any
pseudo
Check the baseband
and
Page 23
N
R-connect
and
Y
Y
Solder
any
U2105 and
N
Y
the
PA
Re-solder
b
U2102
N
N
Y
Replace
and solder