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Flow Chart of Troubleshooting
9-22
9-13. GSM Transmitter
U101pin 16,17,29
32,36 ≥2.8V
pin10≥1.8V
No
Resolder U102
Check UCP200
END
No
Yes
No
Yes
Yes
Yes
Yes
Yes
Yes
No
Yes
No
No
No
No
Check U102,
C117,C126,L123
Check VBAT or PAM
control signal
Resolder or Change U103
Check U103pin 2,3,
5,6,8+Vbatt pin4,
OK?
Yes
U102 pin 4,5,6,7
≥0.2Vp_p
Resolder or Change L101,
Check ANT Switch
control circuit
Change or Resolder F100
U103 pin7
≥-4dBm
U103 pin12
≥ 30dBm
F100 pin10
≥ 30dBm
Check F100
pin11 = H (2.6V),
Pin9 = L
TX ON (5Level)
Resolder CN205,C103,L102
F100 Pin13
≥ 30dBm