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4. TROUBLE SHOOTING
LGE Internal Use Only
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4.6 Checking UMTS Block
4.6.1 Checking Tx level
U101
TP1
TP2
TP3
TP4
FL102
U104
FL101
U100
U100
L100
3.3nH
56p
C100
L101
NA
GND1
3
GND2
4
5
GND3
6
GND4
IN
1
2
OUT
SW100
MM8430-2600RB3
100nH
L102
ANT102
C101
1.2p
WCDMA
20dB
7dB
U103
CP0402A1950DNTR
50OHM
4
3
COUP
2
IN
1
OUT
2
45
31
KRX102U
TR100
2.7nH
L114
L115
5.6nH
130
R121
NA
L118
C164
3.3nH
FL102
ACMD-7602
ANT
3
PGND
4
1
RX
TX
2
NA
C160
100p
C167
3.3p
C162
R119
51
0.01u
C158
L116
2.2p
1u
C435
33p
C155
47
R120
0.01u
C159
C156
4.7u
R122
130
C165
10nH
3
GND2
6
7
GND3
9
GND4
RFIN
2
RFOUT
8
1
VCC1
VCC2
10
4
VCONT
5
VREF
WS2512_TR1G
U104
11
BGND
GND1
+VPWR
+VPWR
PA_R0
PA_ON
VREG_TCXO_2.85
PWR_DET
TP2
TP3
TP4
TP1
For testing, Max power of UMT 2100 is needed.
Summary of Contents for U370
Page 1: ...Date January 2008 Issue 1 0 Service Manual Model U370 Service Manual U370 ...
Page 178: ...Note ...
Page 179: ...Note ...