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Flow Chart of Troubleshooting
9-24
9-15. DCS Receiver
RX ON
RF input : CH center freq
Amp : -50dBm
U201 Pin1
>= -65dBm
U201 pin8,9
>= -65dBm
U100Pin38>=-70dBm
Pin39>=-70dBm
U100 pin6, 7, 8, 9
>= 1V
R110,R113,R114,
R115 >= 1V
Check U300
END
Resolder CN201, C209
Check U201
pin3=L,pin5=L,pin2=L
Check ANT Switch
control circuit
Resolder U201
No
Yes
Resolder C107, C108, L104
Check U100
pin22,28 >= 2.7V
pin4 >= 4.0V
Check & Resolder
RF PSU Part
Check & Resolder
U100, RF26MHz part
R100, R101
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
Yes
Summary of Contents for SGH-X656
Page 41: ...8 PCB Diagrams 8 1 ...
Page 42: ...PCB Diagrams 8 2 ...