Samsung SGH-E390 - DCS Transmitter

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Flow Chart of Troubleshooting
9-26
9-15. DCS Transmitter
Check U102
pin5,8,19,31,35,39
>=2.7V
No
Resolder U102
Check UCP200
END
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
Check & Resolder RFLO
signal, RF13MHz,
RF PSU Part
Check +VBAT or PAM
control signal
Resolder or Change U100
Check U100
pin 2,3,4,5,6 OK?
Yes
U102 pin 1,2,3,4
>= 1V
Resolder L116
Resolder L111.C107.C113
Change or Resolder F100
Check ANT Switch
control circuit
U100 pin1
>= -11dBm
U102 pin2
>= -15dBm
U100 pin10
>= 18dBm
F100 pin12
>= 18dBm
Check F100
pin14 = H(2.68V)
pin13 = L
TX ON (5Level)
Resolder RFS100,C101,L100
F100 Pin10
>= 20dBm