LG A395 Service Manual page 28

GSM850/900 TX Mode
DCS1800/PCS1900 TX Mode
(7/16) U400 : RF7180 -> RF7182
LGE Internal Use Only
TX Module Mode
Off
RX 0
RX 1
VBAT
Changed (9/10)
C410 22u
C408 0.1u
(10V, X5R)
C409 22p
(50V)
NC1
12
GND5
13
GND6
14
ANTENNA
U400
15
NC2
16
Figure 3.3.2 RF-module CIRCUIT DIAGRAM
Tx ENABLE
0
0
0
1
1
C463 C464 C465
DNI DNI DNI
Changed (11/6)
GND4
6
GND3
C461 100p
5
(50ohm)
RFIN_LB
4
GND2
C462 100p
3
(50ohm)
RFIN_HB
2
GND1
(7/3) DC Blocking
1
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3. TECHNICAL BRIEF
GpCtrl1 GpCtrl0
0 0
1 0
1 1
1 0
1 1
Changed (7/27)
R407 10K
C407
R409
220p 24K
close to TXM
Shielding by GND
LowBand_Tx
HighBand_Tx
C451
C452
DNI
DNI
Only for training and service purposes
RF_ANT_SW2
RF_ANT_SW1
RF_PA_EN
RF_TX_RAMP