Table of Contents
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Flow Chart of Troubleshooting
10-13. GSM Transmitter
1)Master
TX ON (5Level)
Yes
F101 pin13
≥ 30dBm
No
F101 pin10
≥ 30dBm
No
PAM100 pin11
≥ 30dBm
No
PAM100 pin7
≥ -4dBm
No
U104 pin 4,5,6,7
≥ 0.2Vp_p
No
Check UCP200
END
Yes
Resolder RFS100,C113,L154
Yes
Yes
Resolder or Change L112
Yes
Yes
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Check F101
pin12 = H (2.6V),
Pin9 = L
Yes
Yes
Check PAM100 pin2,
3,4,5,8 is ok?
No
U104 pin 11,12,17,
No
32,33 ≥ 2.8V
pin10 ≥ 1.8V
Yes
10-24
No
Check ANT Switch
control circuit
Change or Resolder F101
Resolder or Change PAM100
Check VBAT or PAM
control signal
Check U104
C126,C130,C132
And PMU Part
Resolder U104
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