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SGH-X660 Flow Chart of Troubleshooting
2-
19
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U701 CHECK
pin#12
≥
-65dBm
2-2-3. PCS RX
CONTINUOUS RX ON
RF INPUT : 660CH
AMP : -50dBm
NORMAL CONDITION
catch the channel
NO
Check soldered status of
L711, C732, Ant.
YES
RFS701, L708, L709, C704
resolder or change
NO
YES
NO
U701
resolder or change
U701 CHECK
pin#20
≥
-65dBm
YES
U702 CHECK
pin#17,#18
≥
-65dBm
C715, C716, C717, F703
resolder or change
NO
YES
Check the VRF_2.9
of the U102
NO
U702
pin #12, #13 = 2.9V
YES
OSC701 CHECK
pin #1 : 26MHz &
Vp-p : 900mV
NO
OSC701
change or resolder
YES
U702
pin#1,#2,#3,#28 Vp-
p = 100mV
NO
U702
resolder or change
YES
U102 CHECK!!
1
2
3
4
5
6
7