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5-11 GSM Receiver
RF input : CH center freq. + 67.7 kHz
Amp. : -50 dBm
Pin 2, 3, 4, 5
5-19
Rx On
U605
No
Pin 8
-50 dBm
Yes
U605
No
Pin 10
-53 dBm
Yes
U501
No
Pin 1
-53 dBm
Yes
U502
No
Pin 21, 22
-58 dBm
Yes
U502
No
Pin 1, 2
[(Freq-100KHz)*2]
50 mV
Yes
Pin 14, 23, 26, 31, 32
U503
No
Pin 14, 16, 17, 18
> 100 mV
Yes
Resolder
U401
Resolder
U604
Check
No
VC1 : L
VC2 : L
Yes
Resolder
C616
Resolder
U501, C505, C506, L501
Check
U502
No
Pin 12, 13
I/O signal, RF13MHz, RF PSU Part
-6 dBm
OK?
Yes
Check
U502
No
> 2.7 V
OK?
Yes
Resolder
Check
Yes
U503
OK?
No
Flow Chart of Troubleshooting and Circuit Diagrams
Check
Ant. s/w
control
circuit
Resolder
U605
Check & Resolder
U502
Check
Yes
U503
Resolder
Pin 7, 20
U503
OK?
No
Check
Radio PSU,
RF13MHz part
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