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Flow Chart of Troubleshooting
9-26
9-17. PCS Transmitter
U101pin16,17,29,
32,36 ≥2.8V
pin 10≥1.8V
Yes
Resolder U102
Check UCP201
END
No
Yes
No
No
No
Yes
Yes
Yes
Yes
No
Yes
Yes
No
No
No
Check & Resolder
U102, C117,L123,C126
And PMU Part
Check +VBAT or PAM
control signal
Resolder or Change U103
Check U103pin 2,3,
5,6,8+Vbatt pin4,
OK?
Yes
U101 pin 4,5,6,7
≥0.2Vp_p
Resolder or Change
C112, L108
Check ANT Switch
control circuit
Change or Resolder F100
U103 pin1
≤-4dBm
U103 pin18
≥ 25dBm
F100 pin8
≥ 25dBm
Check F100
pin9 = H (2.6V),
pin11 = L
TX ON (0Level)
Resolder CN205,C103,L102
F100 Pin13
≥ 25dBm