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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
4.6.3 Checking PAM Block
HIGH
MODE
LOW
GSM_PA_BAND
10 dB
GSM
DCS/PCS
8 dB
33u
C135
120
R119
120
R118
51
R114
91
R112
R117
2.2K
91
R113
1u
C137
14
GND6
GND7
16
17
GND8
7
GSM_IN
9
GSM_OUT
3
TX_EN
VBATT
4
12
VCC
VRAMP
6
TQM7M5003
U101
2
BS
DCS_PCS_IN
1
DCS_PCS_OUT
15
5
GND1
GND2
8
10
GND3
11
GND4
13
GND5
2
G1
3
G2
5
G3
1
IN
4
O1
EFCH897MTDB1
FL101
68p
C143
68
R111
GSM_PA_BAND
+VPWR
DCS_PCS_TX
GSM_TX
GSM_PA_RAMP
GSM_PA_EN
TP1
TP2
TP3
Test Point
Net name
Description
TP1 GSM_PA_RAMP
Power Amp Gain Control. Typically, 0.2 ~1.6V
TP2 GSM_PA_EN
Power Amp Enable (ON : >2.5V, OFF : <0.7V)
TP3
+VPWR
PAM Supply Voltage (Vcc > 3V)
Schematic of PAM Block
Test Point of PAM Block
TP1
TP2
TP3
Содержание U990
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