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4. TROUBLE SHOOTING
Logic Table of the Antenna Switch
Mode
EGSM TX
EGSM RX
DCS/PCS TX
DCS RX
PCS RX
UMTS
Checking Switch Block power source
Check Soldering of
ANT_SEL0, 1, 2 High Level
2.5V < Voltgae < 3.0V
Check the Logic
in each mode
LGE Internal Use Only
ANT_SEL0
High
Low
Low
Low
Low
Low
NO
YES
- 92 -
ANT_SEL1
Low
Low
High
Low
High
Low
Check VCC
TP1 VREG_RFRX_0_2.85V
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
ANT_SEL2
Low
Low
High
High
Low
Low
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