Only For Training And Service Purposes - LG KU380 Service Manual

4.7.1 Checking RF Tx level
3.7.2 Schematic of RF Tx level
Copyright © 2007 LG Electronics. Inc. All right reserved.

Only for training and service purposes

TP1
C100
1 SW100
56p
G2
ANT RF
G1
H
KMS-507
L102
L103
15nH
100nH
U100
19
VDD GSM900_RX1
GSM900_RX2
GSM1800_RX1
GSM1800_RX2
7
GND1 GSM1900_RX1
8
GND2 GSM1900_RX2
10
GND3 WCDMA2100
12
GND4
13 D5011
GND5
15
GND6
17
GND7
20
GND8
21
GND9
23
GND10 GSM18001900_TX
TP3
- 87 -
4. TROUBLE SHOOTING
TP1
TP2
TP3
GSM 850/ GSM 900 RX HIGH
GSM 850/GSM 900 TX/ WCDMA LOW
GSM 1800/GSM 1900 TX HIGH
5
6
1
2
3
4
9
18
ANT_SEL0
CTRL1
22 1K R102
ANT_SEL1
CTRL2
1K R103
C116 C117
16
33p 33p
GSM900_TX
14
L116
L115
8.2nH
18nH
C122 L117
8.2p 1.5nH
C133 C134
NA NA
16
DCS_PCS_OUT
9
GSM_OUT
TP3
LOW
HIGH
HIGH
2
DCS_PCS_IN
7
U102 GSM_IN
SKY77329
1
TX_EN
3
BS
C
LGE Internal Use Only