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Flow Chart of Troubleshooting
7-
20
15. DCS Transmitter
U103 Pin7
>= 20dBm
Resolder CN100, C144
TX ON (0Level)
Check U103
pin2,4 = L,
pin8 = H (2.68V)
U103 pin9
>= 20dBm
U102 pin31
>= 20dBm
OSC101 pin5
>= 6dBm
U102 pin37
>= 3dBm
Change or Resolder U100
Check ANT Switch
control circuit
Resolder L111, C147
Resolder R124, R125, R126
U103 pin6, 7, 8, 9
>= 500mV
Yes
Check U102
+VBATT,pin42,43
OK?
Resolder or Change U102
or check PAM control signal
Check +VBATT
Check U100
pin4 >= 4.0V
pin22,28 >= 2.7V
Check & Resolder
RF PSU Part
No
No
No
No
No
No
Yes
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
END
Check U200
Resolder U100
or check Txcpo(R114)
Yes
