LG U310 Service Manual page 78

Mode
EGSM TX
DCS/PCS TX
EGSM RX
DCS RX
PCS RX
UMTS
Logic Table of the Antenna Switch
ANT_SEL0 ANT_SEL1
High
Low
High
Low
High
Low
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4. TROUBLE SHOOTING
ANT_SEL2
Low High
High High
High Low
High Low
Low Low
Low High