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4. TROUBLE SHOOTING
4.5.3 Checking PAM Block
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
GSM_PA_BAND
MODE
10dB
GSM850/900
DCS/PCS
10 dB
HIGH
LOW
R114
68
1u
C137
G1
2
G2
3
G3
5
IN
1
O1
4
EFCH836MTDB1
FL101
R118
100
33u
C135
100
R119
68p
C143
100
R113
100
R112
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
R117
2.2K
68
R111
+VPWR
GSM_PA_RAMP
GSM_PA_EN
DCS_PCS_TX
GSM_TX
GSM_PA_BAND
Schematic of PAM Block
TP1
TP2
TP3
Test Point of PAM Block
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)
TP2
TP1
TP3
Содержание KE990 - Viewty Cell Phone 100 MB
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