Samsung SGH-E340 - GSM Transmitter

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Flow Chart of Troubleshooting
7-22
7-13. GSM Transmitter
MODULE1 Pin8
>= 20dBm
Resolder CN101, C101
TX ON (5Level)
Check MODULE1
pin10 = H (2.68V),
pin9,12 = L
MODULE1 pin11
>= 18dBm
U702 pin8
>= 18dBm
U702 pin7
<= -15dBm
U702 pin7
<= -11dBm
Change or Resolder
MODULE1
Check ANT Switch
control circuit
Resolder C141, C166, C152
Resolder R146, R101,
R102, R108
U100 pin
H8,J8,H7,J7
>= 1V
Yes
Check U702
pin 5, OK?
Resolder or Change U702
Check +VBAT or PAM
control signal
Check & Resolder RFLO
signal, RF13MHz,
RF PSU Part
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
No
END
Check U200
Resolder U100
Yes
R135, C157, C123
>=2.7V
OK?