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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
9-27
9-18. PCS Transmitter
TX ON (0Level)
Resolder U100
or check Txcpo(R112)
Check & Resolder
RF PSU part
Check U100
pin4 >= 4.0V
pin22, 28 >= 2.7V
Resolder R205
Check +VBATT
Check U200
+VBATT(pin17) OK?
Resolder or change U200
or check PAM control
signal
Resolder C218, L213, C210
Check ANT Switch
control circuit
Change
or Resolder U201
Check U201
pin3=L,pin5=H,pin2=L
Yes
Resolder CN201, C209
END
Check U300
U100 Pin6, 7, 8, 9
>= 500mV
OSC100 pin5
>= 6Bm
U200 Pin3
>= 3dBm
U200 Pin15
>= 20dBm
U201 Pin6
>= 20dBm
U201 Pin1
>= 20dBm
No
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
Summary of Contents for SGH-X656
Page 41: ...8 PCB Diagrams 8 1 ...
Page 42: ...PCB Diagrams 8 2 ...