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SAMSUNG Proprietary-Contents may change without notice
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Flow Chart of Troubleshooting
9-26
9-17. PCS Receiver
RX ON
RF input : CH center freq
Amp : -50dBm
Check ANT Switch
control circuit
Change
or Resolder U201
Check U201
pin3=L,pin5=L,pin2=H
Resolder CN201, C209
END
Check U300
R110,R113,R114,
R115 >= 1V
U100 Pin 6,7,8,9
>= 1V
U100 Pin35,36
>= -70dBm
U201 Pin10,11
>= -65dBm
U201 Pin1
>= -65dBm
Check & Resolder
U100, RF 26MHz part,
R100, R101
Check & Resolder
RF PSU part
Check U100
pin4 >= 4.0V
pin22, 28 >= 2.7V
Resolder L101, L103, L102
Yes
No
Yes
Yes
Yes
Yes
No
No
No
No
Yes
Summary of Contents for SGH-X656
Page 41: ...8 PCB Diagrams 8 1 ...
Page 42: ...PCB Diagrams 8 2 ...