Ares Communications Technology . , INC
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2051P Service manual 1~3 V3.0- .doc
DB-2051P Service Manual
2004/12/17 Page 46 of 90
Confidential Document
A
Check by a spectrum analyzer:
For GSM: whether IC5_13 and
IC5_14 have a signal as shown in
figures 19 and 20,
or
For DCS: whether IC5_16 has a
signal as shown in figure
21.
N
Check the
voltage of
IC5_20 and
IC5_18 is 2.8V.
N
Re-solder or
replace IC6
and C60.
Y
Check whether
IC5_9 and
IC5_10 have a
control signal.
Re-solder
or replace
IC7.
N
Y
Re-solder
or replace
IC5.
Check by a spectrum analyzer:
For GSM: whether IC3_7 has a signal
as shown in figure 19,
or
For DCS: whether IC3_1 has a signal
as shown in figure 21.
Check:
GSM: IC5, R2, and BF3,
or
DCS: IC5; re-solder or replace
the related part(s) in worst
case.
N
Check by a spectrum analyzer:
For GSM: whether IC3_9 has a
signal as shown in figure 22,
or
For DCS: whether IC3_11 has a
signal as shown in figure 23.
N
Check whether
the voltage of
IC3_5 is 2.8V.
Re-solder
or replace
IC6 and C60
Check whether
IC3_2, IC3_3,
and IC3_6 have
a control signal.
Re-solder
or replace
IC7
Re-solder
or replace
IC5.
Y
Y
N
N
Y
Y
Y
B
