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4. TROUBLE SHOOTING
4.4.3. Checking UMTS PAM Control Block
• PAM control signal
TP1. PWR_DET : UMTS Tx Power Detected value.
TP2. PA_ON1: UMTS800 PAM enable (about 2.6V)
TP3, TP3*. +VPWR : UMTS PAM Main Voltage ( 3V < +VPWR < 4.2V)
TP*:UMTS 800
TP: UMTS 2100
LGE Internal Use Only
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
TP1
TP2
TP3
TP3*
100ohm 0603
75
R1417
U558
50OHM
4
3
COUP
IN
2
OUT
1
100
R1427
L44
NA
0.75p
C1471
100
R1426
PWR_DET
TP1: R1417
0603
0603
0
R1305
C1
68p
10u
C1628
1
VMODE
2
3
U574
AWT6307R
9
BGND
8
GND1
6
GND2
3
RFIN
RFOUT
7
4
VBATT
VCC
5
VEN
C1665
0.1u
C1645
68p
+VPWR
PA_R0
TP2: C1665
TP3*: C1628
2.2nH
L2002
GND5
11
2
RFIN
RFOUT
8
VCC1
1
10
VCC2
4
VMODE
VREF
5
AWT6277R
U578
GND1
3
GND2
6
7
GND3
9
GND4
C1703
120p
0.01u
C1701
4.7u
C1702
NA
L45
+VPWR
TP3: C1702