Only For Training And Service Purposes - LG CT815 Service Manual

GSM 850/EGSM TX
PCN/PCS TX
WB850
WB1900
WB2100
GSM 850 RX
EGSM TX
PCN RX
PCS RX
Checking Switch Block Power Source
Check ANT_SEL 0, 1, 2
Hight Level
1.2V<Voltage<7V
Check the Logic
In each mode
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Only for training and service purposes

ANT_SEL0 ANT_SEL1
HIGH HIGH
HIGH LOW
LOW LOW
LOW HIGH
LOW LOW
LOW HIGH
LOW LOW
LOW HIGH
LOW LOW
Antenna Switch Module Logic
- 83 -
4. TROUBLE SHOOTING
ANT_SEL2
LOW
LOW
HIGH
LOW
LOW
HIGH
HIGH
LOW
LOW
Check the
TP1(VREG_SYNTH)
LGE Internal Use Only
ANT_SEL3
LOW
LOW
HIGH
HIGH
HIGH
LOW
LOW
LOW
LOW