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LGE Internal Use Only
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
- 81 -
4.5.2 Checking PAM Block
TP1. GSM_PA_RAMP : Power Amp Gain Control. typically, 0.2V < Vramp < 1.6V
TP2. GSM_PA_EN : Power Amp Enable
(Power ON : higher than 1.25V , Power OFF : lower than 0.4V)
TP3. GSM_PA_BAND : Power Amp Band Selection Control
(GSM Mode : -0.2V < VBS < 0.4V , DCS/PCS Mode : 1.25V < VBS < 3.0V)
TP4. +VPWR : PAM Supply Voltage Vcc higher than 3.0V
Schematic of GSM PAM Block
TP1
TP2 TP3
TP4
11.4dB
L122
NA
82
R108
L121
15nH
22u
C112
C111
100p
R111
82
2.2K
R114
LMSM32AA-533
2
GND1
GND2
3
4
GND3
GND4
6
8
GND5
RFIN
1
5
RFOUT
VC
7
FL100
1.2p
C101
56p
C103
4.7nH
L120
C113
22p
C100
56p
68p
C126
82
R110
GND1
5
GND2
9
GND3
10
12
GND4
GND5
13
15
GND6
16
GND7
GND8
17
7
GSM_IN
8
GSM_OUT
TX_EN
3
4
VBATT
11
VCC
6
VRAMP
TQM7M5003
U102
2
BS
DCS_PCS_IN
1
14
DCS_PCS_OUT
NA
L123
GSM_PA_BAND
+VPWR
GSM_PA_EN
DCS_PCS_TX
GSM_PA_RAMP
TP3
TP4
TP2
TP1
Содержание CU405
Страница 1: ...Date May 2007 Issue 1 0 Service Manual Model CU405 Service Manual CU405 Internal Use Only ...
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Страница 175: ...Note ...
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