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9-16. GSM900 Transmitter
TX ON (5 Level)
Yes
U100 pin10
<= 20dBm
No
U100 pin15
<= 20dBm
No
PAM100 pin9
<= 20dBm
No
C142,C127 > 3 V,
C141, F101 > 3.5V
Yes
PAM 100 pin 9
Yes
U102 pin 1,2,3,4
>= 500mV
No
Check UCP200
END
Yes
Resolder RFS100, C144, L106
Yes
Yes
Resolder L113,C133,C135
No
No
Resolder or Change PAM100
Yes
or Check pins related to U101
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Check U100
pin14 = H (2.68V),
pin13 = L
No
Yes
Check ~ VBATT
No
Resolder U101
9-27
Flow Chart of Troubleshooting
Yes
Change or Resolder U100
Check ANT Switch
control circuit
Resolder or Change PAM100
Check +VBATT or PAM
control signal
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