Table of Contents
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Flow Chart of Troubleshooting
9-12. GSM Receiver
RX ON
RF input : CH center freq : +67.7kHz
Amp : -50dBm
Yes
DUF100 Pin8
>= -65dBm
Yes
DUF100 pin 5,6
>= -65dBm
Yes
U102
pin 30 >= -70dBm
pin 29 >= -70dBm
Yes
U102 pin 7, 8, 9,
10
>= 1V
Yes
R122, R123, R124,
R125 >= 1V
Yes
Check UCP200
END
No
Resolder
No
No
Resolder L106, C103, C108
No
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RFS101, C101, L104
Check DUF100
pin9,pin10,pin12 = L
Yes
Check U102
pin 23, 26, 31
>= 2.7V
Yes
9-28
No
Check ANT Switch
control circuit
Resolder DUF100
No
Check & Resolder
U102, R109,
RF26MHz, RF PSU Part
Resolder U102
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