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Flow Chart of Troubleshooting
9-26
9-11. GSM900 Receiver
RX ON
Cell Power : -60dBm
u101 PIN7
≥
-65dBm
Yes
Resolder RFS100, C101, C102, L101
No
Yes
No
Check u101
PIN10,PIN2 = L
u101 Pin 1
≥
-68dBm
Check ANT Switch
control circuit
No
Yes
Resolder u101
Yes
u103
pin 19
≥
-70dBm
pin 20
≥
-70dBm
Resolder F100, C112, L104,L105,
L106
No
Yes
u103pin VDDs
≥
2.8V
No
u103 pin 4,5,6,7
≥
0.2Vp_p
No
Check & Resolder
C126, C127
Yes
Yes
Resolder u103
Check UCP200
END