Dcs Transmitter - Samsung SGH-X640 Service Manual

F low Chart of Troubleshooting

15. DCS Transmitter

TXO N (0L evel)
Y es
U 103 Pin7
>= 20dBm
N o
U 103 pin9
>= 20dBm
N o
U 102 pin31
>= 20dBm
N o
U 102 pin37
>= 3dBm
N o
O SC 101 pin5
>= 6dBm
N o
U 103 pin6, 7, 8, 9
>= 500m V
N o
C heck U 200
E N D
Y es
R esolder C N 100, C 144
Y es
Y es
R esolder L 111, C 147
Y es
Y es
R esolder R 124, R 125, R 126
Y es
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C heck U 103
pin2,4 = L ,
pin8 = H(2.68V )
N o
Y es
C heck U 102
+V BA TT,pin42,43
O K ?
Y es
C heck U 100
pin4 >= 4.0V
pin22,28 >= 2.7V
Y es
7- 20
Y es
C hange or R esolder U 100
C heck A N T Switch
control circuit
R esolder or C hange U 102
or check PA Mcontrol signal
C heck +V BA TT
N o
C heck &R esolder
R F PSU Part
R esolder U 100
or check Txcpo(R 114)