Dcs Receiver - Samsung SGH-X640 Service Manual

14. DCS Receiver

R XO N
R Fin p u t : C Hcen ter freq
A m p: -50d B m
Y es
U 103 Pin7
>= -65dB m
Y es
U 103 pin1
>= -65dB m
Y es
F102 pin1
>= -70dB m
Y es
U 100
pin38 >= -70dBm
pin39 >= -70dBm
Y es
U 100 pin6, 7, 8, 9
>= 1V
Y es
R 116, R 117, R 119,
R 121 >= 1V
Y es
C heck U 200
E N D
N o
R esolder C N 100, C 144
N o
N o
R esolder F102, C 116, L 107
N o
R esolder C 115, C 117, L 106
N o
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C heck U 103
pin4 = L , pin8 = L
Y es
C heck U 100
pin10,22,28 >= 2.7V
pin20 >=4.0V
Y es
7- 19
F low Chart of Troubleshooting
N o
C heck A N T Switch
control circuit
R esoder U 103
N o
C heck &R esolder
R F PSU Part
C heck & R esolder
U 100, R F26M H z part,
R 100, R 101