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5-12 GSM Transmitter
Tx On (level : 5)
Pin 5, 6, 7, 8
Flow Chart of Troubleshooting and Circuit Diagrams
Yes
U605
Pin 8
‡ 30 dBm
No
Yes
U605
Pin 5
‡ 30 dBm
No
Yes
U600
Pin 9
‡ 30 dBm
No
U600
Pin 7
‡ 0 dBm
No
U502
Yes
Pin 25
‡ 0 dBm
No
U502
Yes
40 ‡ mV
Yes
Resolder
U600
Resolder
U604
Check
VC1 : L
VC2 : H
No
Resolder
C612
Yes
Check
U600 : +VBATT,
Pin 2, 5, 6
OK?
Resolder
R509, R507,
R510, C511
Check
U502
No
Pin 9, 10, 12, 13
‡ -6 dBm
OK?
Yes
Check
U502
No
Pin 14, 23, 26, 31, 32
> 2.7 V
OK?
Yes
Yes
Change or Resolder
U605
Check
Ant. S/W Control Circuit
Yes
Resolder or
Change U600
No
Check +VBATT
or PAM Control signal
Check & Resolder
I/O signal, RF13MHz, RF PSU Part
Resolder
U502
5-20
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