Only For Training And Service Purposes - LG -S310 Service Manual

3. TECHNICAL BRIEF
3.2.4 Front End Module(LMSP4DNA-883)
SAW front end module for mobile telephone systems
Covering GSM850, GSM900, GSM1800, GSM1900 bands
Integration of GSM 850, EGSM, DCS, PCS RX SAWs
Balanced outputs of all RX ports
FEM(FL101) has two logic inputs, which are VC1, VC2, for selecting RX/TX-mode and low/high-band operation
ANT_FEED
LGE Internal Use Only
[Table 3.2.4-1] FEM control logic
GND
RF_ANT_SW2
RF_ANT_SW1
C124
100p
SW101
G2
ANT RF
G1
[Figure 3.2.4-1] FEM schematic
FL101
836.5 ,1880MHz
NC2
20
NC1 GSM850_900TX
19 15
GSM1800_1900TX
11
GND5
18
GND4 GSM1900RX2
16 8
GND3 GSM1900RX1
13 7
GND2 GSM1800RX2
12 6
GND1 GSM1800RX1
9 5
GSM900RX2
4
VC2 GSM900RX1
10 3
VC1 GSM850RX2
14 2
GSM850RX1
1
C125
100p
C129 100p
L102
100n
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C114
100p
100p
C117

Only for training and service purposes