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Flow Chart of Troubleshooting
7-
28
7-14. DCS Transmitter
TX ON (0Level)
Resolder C117, L116
Check ANT Switch
control circuit
Change
or Resolder U100
Check U100
pin2=L,pin4=L,pin8=H
Yes
Resolder CN101, C102
END
Check U202
U101 Pin6, 7, 8, 9
>= 500mV
OSC100 pin2
>= 6Bm
U102 Pin37
>= 3dBm
U102 Pin31
>= 20dBm
U100 Pin9
>= 20dBm
U100 Pin7
>= 20dBm
Resolder U101
or check Txcpo(R129)
Check & Resolder
RF PSU part
Check U101
pin4 >= 4.0V
pin22, 28 >= 2.7V
Resolder R115, R120, R121
No
Yes
Yes
Yes
Check U102
+VBATT(pin42,43)
OK?
Resolder or change U102
or check PAM control
signal
Check +VBATT
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
No
No
No
