- ページ 25
携帯電話 Lenovo A859のPDF サービスマニュアルをオンラインで閲覧またはダウンロードできます。Lenovo A859 36 ページ。
Lenovo A859 にも： 重要製品情報マニュアル (23 ページ), クイック・スタート・マニュアル (6 ページ), クイック・スタート・マニュアル (13 ページ), クイック・スタート・マニュアル (33 ページ)
ページを印刷する
Repair Manual of Lenovo S920 Mobile Phone
4.2.2 AGC
Fault: AGC calibration Fail.
Reason: RF test cable is not connected well during calibration; the devices in receiving
cable are in cold solder joint (such as RF connectors, antenna switch, saw the filter and
the surrounding capacitance).
Shooting：
N
GSM frequency
band fails?
N
Whether C2130,L2102is in
Y
Re-weld
cold solder joint?
Whether Rx is in
Re-weld/Replace
cold solder joint?
coupler
N
Whether differential pathare
Y
Replace the
in cold solder joint?
welding
N
Check the transceiver chip
MT6166(U2101U601)and
the baseband chip
Notes: Remeber to recalibrate after replacing compements.
Rx path lo
calibration fails
Check calibration report to see
whether the two frequency
bands fail?
Y
Y
Whether C2117,L2101 is
Re-weld
cold solder joint
in
N
Whether Rx is in cold
Y
Re-weld or
solder joint?
replace
N
Whether
L2104,
L2105,L2106
Y
d solder joint?
are in col
N
U1201
25
Y
Check whether RF cable
and
fixtures
are
well
connected?
Y
Check whether RF
connector CON2201
is in
cold solder joint?
N
Re-weld or
Whether
R2115,C2131
replace
solder joint?
in cold
N
Reconnect and
calibrate
Y
Re-weld
CON2201
is
Y
Re-weld