Gsm Receiver - Samsung SCH-i830 Service Manual

Flow Chart of Troubleshooting
7-4. GSM/DCS

7-4-1. GSM Receiver

RX ON
RF input : CH center freq
Amp : -50dBm
Yes
C1231
>= -60dBm
Yes
C1221
>= -65dBm
Yes
C1152
>= -70dBm
Yes
L1113
>= -75dBm
Yes
Check U1102
END
No
No
No
No
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Resolder U1201, C1208
Check U1202
pin4 = H, pin6= L
Yes
Resolder DUF1200
Resolder F1104
7-36
No
Check SPDT
control circuit
Resoder U1202