Pcs Transmitter - Samsung SGH SGH-D500 Service Manual

Flow Chart of Troubleshooting

17. PCS Transmitter

TX ON (5Level)
Yes
U100 Pin7
>= 20dBm
Yes
U100 pin9
>=18dBm
Yes
PAM100 pin18
>= 18dBm
Yes
PAM100 pin5
>= -11dBm
Yes
U102 pin2
>= -15dBm
Yes
U102 pin7, 8, 9, 10
>= 1V
Yes
Check U200
END
No
Resolder RFS100, C102, L106
No
No
No
No
Resolder R116, R117, R118, C147, L117, C138, C132
No
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Check U100
pin2, pin8 = H,
pin4 = L
Yes
Resolder L115, C135
Check PAM100
+VBAT,
pin2,3,13,14 OK?
Yes
Check U102
pin23, 26, 31
>= 2.7V
Yes
7-28
No
Check ANT Switch
control circuit
Change or Resolder U100
No
Resolder or Change PAM100
Check +VBAT or PAM
control signal
No
Check & Resolder RFLO
signal, RF26MHz,
RF PSU Part
Resolder U102