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Flow Chart of Troubleshooting
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9-21
9-13. GSM Transmitter
TX ON (5Level)
F101 Pin13
≥ 30dBm
No
Resolder RFS100, C102, R121,
L101
Yes
No
Check FEM Switch
control circuit
No
Check F101
pin9=L, pin11=H
F101 Pin10
≥ 30dBm
Yes
Change
or Resolder F101
Yes
No
Resolder C110, C108, L109
PAM100 Pin11
≥ 30dBm
Yes
Check PAM100
+VBAT(pin17) OK?
Check VBAT or PAM
control signal
No
No
PAM100 Pin4
≥ -4dBm
Resolder or change
PAM100
Yes
Yes
Check & Resolder
PMU part
No
No
Check U101
pin12,13,29,29 ≥
2.8V
pin11 ≥ 1.8V
U101 pin 4, 5, 6, 7
≥ 0.2Vp_p
Yes
Yes
Resolder U101
Check U201
END
