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SGH-X660 Flow Chart of Troubleshooting
2-
17
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U701 CHECK
pin#12
≥
-65dBm
2-2.RF
2-2-1. EGSM RX
CONTINUOUS RX ON
RF INPUT : 62CH
AMP : -50dBm
NORMAL CONDITION
catch the channel
Check soldered status of
L711, C732, Ant.
U702
pin #12, #13 = 2.9V
U701 CHECK
pin#16
≥
-65dBm
U702 CHECK
pin#21,#22
≥
-65dBm
RFS701, L708, L709, C704
resolder or change
U701
resolder or change
C701, C702, C703, F701
resolder or change
Check the VRF_2.9
of the U102
OSC701 CHECK
pin #1 : 26MHz &
Vp-p : 900mV
OSC701
change or resolder
U702
resolder or change
U102 CHECK!!
U702
pin#1,#2,#3,#28
Vp-p = 100mV
NO
YES
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
1
2
3
4
5
6
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