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Flow Chart of Troubleshooting
9-28
9-16. DCS Transmitter
U101pin11,12,16,17,
29,32,33,36≥2.8V
pin 10≥1.8V
F100 Pin13
25dBm
Resolder CN100,C101,L104
TX ON (0Level)
Check F100
pin9 = H (2.6V),
pin11 = L
F100 pin8
25dBm
U100 pin20
25dBm
U100 pin6
≤-4dBm
Change or Resolder F100
Check ANT Switch
control circuit
Resolder or Change
C117, C118, C120
U101 pin 4,5,6,7
≥0.2Vp_p
Yes
Check U100pin 4,5,
8,14 +Vbatt pin2,3,
15,16 OK?
Resolder or Change U100
Check +VBAT or PAM
control signal
Check & Resolder
C121,C124,C126
And PMU Part
No
No
No
Yes
Yes
No
Yes
Yes
Yes
Yes
No
No
No
Yes
No
END
Check U200
Resolder U101
Yes