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SGH-X600 Flow Chart of Troubleshooting
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7-
3
13. GSM Transmitter
U102 Pin10
>= 20dBm
Resolder CN101, C101
TX ON (5Level)
Check U102
pin7 = H (2.68V),
pin4 = L
U102 pin3
>= 20dBm
U101 pin9
>= 20dBm
OSC100 pin1
>= -8dBm
U101 pin7
>= -11dBm
Change or Resolder U102
Check ANT Switch
control circuit
Resolder C190, L113
Resolder R110, R111, R112
U103 pin6, 7, 8, 9
>= 1V
Yes
Check U101
+VBATT, pin4, 7
OK?
Resolder or Change U101
Check +VBATT or PAM
control signal
No
No
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
END
Check U200
Check U103
pin4, 22 >= 2.7V
Resolder U103
R134, R135, R136,
R137 >= 500mV
Yes
Check & Resolder
R130,R131,C143,C144,C146
OSC100
No
No