Gsm Receiver - Samsung SGH SGH-D500 Service Manual

12. GSM Receiver

RX ON
RF input : CH center freq : +67.7kHz
Amp : -50dBm
Yes
U100 Pin7
>= -65dBm
Yes
U100 pin5
>= -65dBm
Yes
F100 pin1
>= -67dBm
Yes
U102
pin29 >= -70dBm
pin30 >= -70dBm
Yes
U102 pin7, 8, 9, 10
>= 1V
Yes
R112, R113, R114,
R115 >= 1V
Yes
Check U200
END
No
Resolder RFS100, C102
No
No
Resolder F100, C104, L102
No
Resolder C103, C105, L101
No
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Check U100
pin2,pin4,pin8 = L
Yes
Check U102
pin 23,26,31 >=2.7V
Yes
7-23
Flow Chart of Troubleshooting
No
Check ANT Switch
control circuit
Resolder U100
No
Check & Resolder
U102, R103, R104
RF26MHz, RF PSU Part
Resolder U102