Lenovo A859 Руководство по эксплуатации - Страница 26
Просмотреть онлайн или скачать pdf Руководство по эксплуатации для Сотовый телефон Lenovo A859. Lenovo A859 36 страниц.
Также для Lenovo A859: Важная информация о продукте Руководство (23 страниц), Краткое руководство по эксплуатации (6 страниц), Краткое руководство по эксплуатации (13 страниц), Краткое руководство по эксплуатации (33 страниц)
Печатать страницу
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