LG KM500 Service Manual page 43

4. Trouble Shooting
4.1.2.2 Power Amplifier Module (RPF09036B)
Select the RX / TX path and amplifier the power.
] Part Description
Front End Module Switch Control
C434: VRAMP
C430: BAND_SELECT
C425: TX ON
Application
GSM900 / GSM900
DCS1800 / PCS1900
L405
3.3nH
C432 C433
3.3p
10nH
VBAT
C435 C436 C437
10u
0.01u 22p
L406
1.8nH
C440 C441
1.2p NA
LGE Internal Use Only
Mode
GMSK
EDGE
GMSK
EDGE
G90G85GND
G1
G85LNAI
H1
L403
G85LNAIB
12nH F2
G85GND
4.7nH L407
G2
GNDLNA_TX1
H2
TXON
E3
GNDDMIXIN
J2
DMIXIN
J1
DMIXINB
120 100
R402 R403
R404 R405
C428
51 68
22p
120 100
U403
R406 R407
POUT_GSM
13
GND7
14
VLDO
15
VBAT1
U403
16
RPF09036B
VBAT2
17
GND5
18
POUT_XCS
19
<Fig.18> PAM Circuit Diagram
- 44 -
Vtxon
High
High
High
High
R2A60167BG
VCCLOGIC1
STROBE
SYSCLK
RXTXDATA
RXTXEN
CTRLEN
CTRLDATA
CTRLCLK
C426 0.01u
C429
0.01u
C430
1000 pF
PIN_GSM
7
C434
TX_ON
6 NA
VRAMP
5
GND6
4
VREG
3
BAND_SELECT
2
PIN_XCS
1
Copyright © 2008 LG Electronics. Inc. All right reserved.
Vband
High
High
Low
Low
E8
F8
F9
DIGITALRF_DATA
G7
DIGITALRF_ENABLE
G6
TEST1
G9
DIGITALRF_RF_CS
G8
DIGITALRF_RF_DATA
H9
DIGITALRF_RF_CLK
SYSCLKEN
C_VCCRF
C_VCCRF
C438
22p
Only for training and service purposes
VRIO