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Flow Chart of Troubleshooting
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9-27
9-12. GSM Transmitter
118, C116, C115
≥2.8V
C114 ≥ 2.9V
No
Resolder U101
Check UCP200
END
No
Yes
No
Yes
Yes
Yes
Yes
Yes
Yes
No
Yes
No
No
No
No
Check & Resolder
U101, C118, C116, C115
And PMU Part
Check VBAT or PAM
control signal
Resolder or Change U107
Check U107 pin
2,3,5,6,8+Vbatt
pin4, OK?
Yes
U101 pin C2, B1,
B2, A1 ≥ 0.2Vp_p
Resolder or Change L114, C109,
C110
Check ANT Switch
control circuit
Change or Resolder F100
U107 pin7
≥ -4dBm
U107 pin12
≥ 30dBm
F100 pin13
≥ 30dBm
Check F100
pin12 = H (2.6V),
Pin10 = L
TX ON (5Level)
Resolder RFS100,C101,L107
F100 Pin8
≥ 30dBm