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5-20
Flow Chart of Troubleshooting and Circuit Diagrams
5-11 GSM Receiver
Rx On
RF input : CH center freq. + 67.7 kHz
Amp. : -50 dBm
U203
Pin 8
≥
-50 dBm
U203
Pin 10
≥
-53 dBm
F205
Pin 1
≥
-53 dBm
U623
Pin 21, 22
≥
-58 dBm
U623
Pin 1, 2
≥
50 mV
U685
Pin 2, 3, 4, 5
> 100 mV
Resolder
CN1
Check
VC1 : L
VC2 : L
Check
Ant. s/w
control
circuit
Resolder
R779
Resolder
F205, C787, C788, L611
Resolder
U467
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
Yes
Check
U623
Pin 12, 13
[(Freq-100KHz)*2]
≥
-6 dBm
OK?
No
Resolder
U203
Check
U623
Pin 14, 23, 26, 31, 32
> 2.7 V
OK?
Resolder
U685
No
Yes
Yes
No
Check
U685
Pin 14, 16, 17, 18
OK?
Check
U685
Pin 7, 20
OK?
No
Check
Radio PSU,
RF13MHz part
Yes
No
Check & Resolder
I/O signal, RF13MHz, RF PSU Part
Resolder
U623