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9-13. GSM Transmitter
TX ON (5Level)
DUF100 Pin8
>= 20dBm
Yes
DUF100 pin11
>= 18dBm
Yes
PAM100 pin16
>= 18dBm
Yes
PAM100 pin12
>= -11dBm
Yes
F100 pin3
>= -15dBm
Yes
U102 pin7, 8, 9, 10
>= 1V
Yes
Check UCP200
END
No
Resolder
No
No
Resolder
No
No
No
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RFS101, C101, L104
Check DUF100
pin10 = H (2.68V),
pin9,12 = L
Yes
L109, L110, C123
Check PAM100
VBAT, pin2,5,6,7
OK?
Yes
Resolder R115
No
Check U102
pin23,36,31
>= 2.7V
OK?
Yes
9-29
Flow Chart of Troubleshooting
No
Check ANT Switch
control circuit
Change or Resolder
DUF100
No
Check VBAT or PAM
control signal
Resolder or Change PAM100
Check & Resolder RFLO
signal, RF13MHz,
RF PSU Part
Resolder U102
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