Pcs Transmitter - Samsung SGH-X550 Service Manual

9-17. PCS Transmitter

TX ON (5Level)
Yes
DUF200 Pin8
>= 20dBm
Yes
DUF200 pin13
>= 18dBm
Yes
PAM100 pin15
>= 18dBm
Yes
PAM100 pin3
<= -11dBm
Yes
U101 pin1,2
<= 15dBm
Yes
U101 pin 6,7,8,9
>= 1V
Yes
Check U500
END
No
Resolder RFS200,C203,L201
No
No
Resolder or Change PAM100
No
No
Resolder C127,C128,L119
No
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Check F100
pin12 = H (2.6V),
10 = L
Yes
No
Check F200, OK?
Yes
No
U101 pin 10,15
>=2.8V
Yes
9-25
Flow Chart of Troubleshooting
No
Check ANT Switch
control circuit
Change or Resolder
L205,C213,C214
Resolder or Change F200
Check +VBAT or PAM
control signal
Check & Resolder RFOH
signal, RF13MHz,
RF PSU Part
Resolder U101