Gsm850 Receiver - Samsung SGH-T619 Service Manual

9-12. GSM850 Receiver

RX ON
RF input : CH center freq : +67.7kHz
Amp : -50dBm
Yes
F101 Pin10
>= -65dBm
Yes
F101 pin6,7
>= -68dBm
Yes
U102
pin 29 >= -74dBm
pin 30 >= -74dBm
Yes
U102 pin 7.8.9.10
>= 1V
Yes
Check UCP200
END
No
Resolder RFS100,C101,L141
No
No
Resolder C104, C105, L103
No
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Check F101
pin13,15,16 = L
pin11 = H
Yes
Check U102 pin
23,26,31 >=2.7V
Yes
9-23
Flow Chart of Troubleshooting
No
Check ANT Switch
control circuit
Resolder F101
No
Check & Resolder
U102, R138, C114
RF26MHz, RF PSU Part
Resolder U102