Dcs Transmitter - Samsung SGH-E330N Service Manual

Flow Chart of Troubleshooting

7-15. DCS Transmitter

TX ON (0Level)
Y e s
U103 Pin7
> = 20dBm
No
U103 pin9
> = 20dBm
No
U102 pin31
> = 20dBm
No
U102 pin37
> = 3dBm
No
OSC101 pin5
> = 6dBm
No
U103 pin6 , 7 , 8 , 9
> = 500mV
No
Check U706
END
Y e s
Resolder CN502, C144
Y e s
Y e s
Resolder L111 , C147
Y e s
Y e s
Resolder R124, R125, R126
Y e s
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Check U103
pin2 , 4 = L ,
pin8 = H (2.68V)
No
Y e s
Check U102
+VBATT, p in42, 4 3
OK ?
Y e s
Check U100
pin4 > = 4.0V
pin22 , 2 8 > = 2.7V
Y e s
7- 22
Y e s
Change or Resolder U100
Check ANT Switch
control circuit
Resolder or Change U102
or check PAM control signal
Check +VBATT
No
Check & Resolder
RF PSU Part
Resolder U100
or check Txcpo(R114)