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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
U203
Pin 8
≥ 30 dBm
No
Yes
U203
Pin 5
≥ 30 dBm
No
Yes
U476
Pin 9
≥ 30 dBm
No
U476
Pin 7
≥ 0 dBm
No
U623
Yes
Pin 25
≥ 0 dBm
No
U623
Yes
40 ≥ mV
Yes
Resolder
U467
Resolder
CN1
Check
VC1 : L
VC2 : H
No
Resolder
C824, C264
Yes
Check
U476 : +VBATT,
Pin 2, 5, 6
OK?
Resolder
R765, C822
Check
U623
No
Pin 9, 10, 12, 13
≥ -6 dBm
OK?
Yes
Check
U623
No
Pin 14, 23, 26, 31, 32
> 2.7 V
OK?
Yes
Yes
Change or Resolder
U203
Check
Ant. S/W Control Circuit
Yes
Resolder or
Change U476
No
Check +VBATT
or PAM Control signal
Check & Resolder
I/O signal, RF13MHz, RF PSU Part
Resolder
U623
5-21
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