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Flow Chart of Troubleshooting
9-16
9-10. GSM Transmitter
END
Check U200
Check VBAT or PAM
control signal
No
Change or Resolder U103
Yes
U103 pin19
≥ 30dBm
Resolder RFS100,C112,L102
TX ON (5Level)
VDD = H (2.5V),
VC1 , VC2 = 1.5V
VC3= 0
RFS100 pin25
≥ 30dBm
PAM100 pin11
≥ 30dBm
PAM100 pin7
≥ -4dBm
Check ANT Switch
control circuit
Resolder or Change R108
Yes
Check PAM100
pin2,3,4,5,8 is ok?
Resolder or Change PAM100
No
No
No
No
Yes
Yes
Yes
Yes
No
Yes