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Y
Change U901
N
Check OSC902
pin 1
≥
-20 dBm
Resolder or change
OSC902
N
SAMSUNG Proprietary-Contents may change without notice
5-11
SGH-Q208 Flow Chart of Troubleshooting and Circuit Diagrams
5-11. GSM Receiver
RX On
RF input : 62 CH
Amp. : -50 dBm
Y
N
N
Y
U1006
Pin 9
≥
-70 dBm
Resolder or Change CN1001
N
Resolder or Change U901
Y
F1004
pin 5
≥
-73 dBm
Resolder F1004
N
Y
F902
pin 5, 6
≥
-60 dBm
Change F902
Y
U901
pin 43, 44
≥
-50 dBm
N
Y
U1006
Pin 5
≥
-70 dBm
N
Y
Resolder U1006,
Pin 5
≥
-70 dBm?
Check voltage
U1006 pins
Pin 2 : L
Pin 4 : H
Pin 8 : H
Pin 10 : L
Y
U901
pin 4
≥
-55 dBm
&
≥
2.5 Vdc
Y
Resolder or
Change U901
END
N
Y
F901
pin 4
≥
-60 dBm
Resolder or Change F901
N
Y
F902
pin 1, 2
≥
-55 dBm
Check OSC901
pin 1
≥
-20 dBm
Change OSC901
N
•All or RF values by dBm should be measured in max hold status of
RF spectrum analyzer in active call