Lenovo A859 Service Manual - Page 26
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Repair Manual of Lenovo S920 Mobile Phone
4.2.3 APC
Fault 1
Fault: APC calibration Fail.
Cause: RF test cable is not connected well during calibration; PA is oppositely pasted; PA
and peripheral circuit are in cold solder joint; The patch of RF input circuit of PA is deviated
with short-circuit shield box.
Shooting:
GSM frequency
fails?
Y
PA input
Re-weld
are
R2115,C2131
welded with
disconnection?
N
Weld PA
Whether PA is in
Y
U2102
cold solder joint?
Notes:Remeber to recalibrate after replacing compements; the problem analysis of PCS
TX APC is the same as DCS.
PCL calibration Fail
Check calibration report to
N
see whether each frequency
bands fail?
N
DCS1800/PCS190
0 frequency fail
Y
PA input
R2115,
Replace
are welded with
Y
C2131
components
disconnection？
N
Y
Whether
Replace PA
PA(U2102) is in
cold solder joint?
26
Y
Check whether RF
Reconnect
N
cable and fixtures are
and calibrate
well connected?
Y
Whether RF connector
Y
Re-weld
CON2201are in cold
solder joint?
N
Whether PA（U2102）is
Y
Re-weld
in cold solder joint?
U2102