Gsm Transmitter - Samsung SGH-E700 Service Manual

13. GSM Transmitter

TX ON (5Level)
F101 Pin8
>= 20dBm
F101 pin5
>= 20dBm
PAM100 pin9
>= 20dBm
PAM100 pin7
>= -11dBm
VCO101 pin1
>= -8dBm
U100 pin5, 6, 7, 8
>= 500mV
Check UCP200
END
Yes
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
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Resolder RFS100, C100
Check F101
pin11 = H (2.68V),
pin2 = L
No
Resolder L105, C114
Check PAM100
+VBATT, pin4, 7
OK?
No
Resolder R107, R108, R109
Check U100
pin 26>=-20dB
& pin11>=2V
OK?
No
Check U100 pin
2,12,4,23>=2.7V
OK?
Yes
18
7-
SGH-E700 Flow Chart of Troubleshooting
Yes
Change or Resolder F101
Check ANT Switch
control circuit
Yes
Resolder or Change PAM100
Check +VBATT or PAM
Yes
Check & Resolder RFLO
signal, RF13MHz,
Resolder U100
control signal
RF PSU Part