LG KF700Q Service Manual page 109

4. TROUBLE SHOOTING
GSM850/EGSM900 TX
DCS1800/PCS1900 TX
WCDMA850
WCDMA2100
GSM850 RX
EGSM900 RX
DCS1800 RX
PCS1900 RX
Checking Switch Block power source
LGE Internal Use Only
ANT_SEL0 ANT_SEL1
HIGH HIGH
HIGH LOW
LOW HIGH
LOW LOW
LOW HIGH
LOW LOW
LOW HIGH
LOW LOW
[Table 4.1] Logic Table of the FEM
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ANT_SEL2 ANT_SEL3
LOW
LOW
LOW
HIGH
HIGH
HIGH
LOW
LOW
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Only for training and service purposes
LOW
LOW
HIGH
HIGH
LOW
LOW
LOW
LOW