Samsung SGH-T429 Service Manual - Page 55
DCS Receiver
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9-14. DCS Receiver Flow Chart of Troubleshooting RX ON RF input : CH center freq : +67.7kHz Amp : -50dBm Yes F100 Pin7 No >= -65dBm Yes F100 Pin3 No >= -68dBm Yes No F100 pin3 >= -70dBm Yes No U101 pin 4,5,6,7 >= 1V Yes Check UCP200 Resolder CN100,C104 Check F100 No pin10,pin12 = L Yes Resolder C108, C109, L110 Check ANT Switch control circuit Resolder F100 No U101 pin12,13,28,29 >=2.8V Check & Resolder U101, RF PSU Part Yes Resolder U101 END 9-23 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization
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SAMSUNG Proprietary-Contents may change without notice
Flow Chart of Troubleshooting
This Document can not be used without Samsung's authorization
9-23
9-14. DCS Receiver
Check F100
pin10,pin12 = L
Check
UCP200
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Resolder U101
Check & Resolder
U101, RF PSU Part
U101
pin12,13,28,29
>=2.8V
Resolder
C108, C109, L110
Resolder F100
Check ANT Switch
control circuit
F100 pin3
>= -70dBm
U101
pin 4,5,6,7
>= 1V
F100
Pin3
>= -68dBm
RX ON
RF input : CH center freq :
+67.7kHz
Amp : -50dBm
Yes
No
END
Resolder
CN100,C104
F100 Pin7
>= -65dBm