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Flow Chart of Troubleshooting
9-12. GSM Transmitter
TX ON (5Level)
Yes
F100 Pin13
≥ 30dBm
No
F100 pin10
≥ 30dBm
No
pam100 pin12
≥ 30dBm
No
pam100 pin7
≥ -4dBm
No
U100 pin 4,5,6,7
≥ 0.2Vp_p
No
Check UCP200
END
Yes
Resolder RFS100,C101,L100
Yes
Yes
Yes
Yes
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Check F100
pin12 = H (2.6V),
Pin9 = L
Yes
Resolder or Change
C113,L109,C114
Check pam100pin
2,3,5,6,8+Vbatt
pin4, OK?
No
U100pin11,12
16,17,
29,32,33,36 ≥2.8V
pin10≥1.8V
Yes
9-22
No
Check ANT Switch
control circuit
Change or Resolder F100
Yes
Resolder or Change pam100
Check VBAT or PAM
control signal
No
Check & Resolder
C116,C119,C122
and PMU Part
Resolder U100
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