LG KF350 Service Manual page 117

7. CIRCUIT DIAGRAM
1 2 3 4 5
A VC1 (FE1) VC2 (FE2)
GSM850 / 900_TX H H
GSM 1800 / 1900_ TX L H
GSM850 / 900_RX H L
GSM 1800 / 1900_ RX L L
B
ANT400
WFL-R-SMT10
C406
G1
SW400 RF-800 100p
G2
G2
G3 ANT
ANT RF
G1
C407
DNI
C
2V85_VRF 2V85_VRF
1V5_VRF
C423
2.2p
C431 C432
0.1u 4.7n
D
LBAND_PAM_IN
HBAND_PAM_IN
R411
C440
10
220n
E
1V5_VRF 2V85_VRF
R412
10
C443 C444
220n 0.1u
F
SC400
1 7
2 8
G
3 9
4 10
5 11
6 12
H
1 2 3
LGE Internal Use Only
6
2V85_VRF R430
R431
LMSP43QA-538(CMOS)
C400
1000p
R402
100ohm
FE1
FE2
R403
100ohm
C401 C402
100p 100p
NC2
FL400 24
NC1
LMSP43QA-538 23
ANT
11
L406
100nH
L404
6.8nH
C410 C411
0.5p
0.5p
L405
3nH
C419
0.01u
GSM850 GSM900 DCS1800 PCS1900
C421 C422
DNI 1.5p
C424 C425
C426 C427 C428 C429 C430
2.2p 2.2p
2.2p 2.2p 2.2p 2.2p 2.2p
L402
L400 L401 L403
18nH 6.8nH
18nH 5.6nH
2V85_VRF 2V85_VRF
1V5_VRF
C433 C434 C435 C436
0.1u 0.1u 0.1u 0.1u
FE2
33
VBIAS
34
VDDTX1V5 VDDRX2V8
35 20 C437
TX1 VDDRX1V5
U401
36 19 R410 47n
TX2 PMB6272 VCO_RC
37 18 820
VDDTX2V8 VDDVCO2V8
38 17
VDDMIX2V8 EN RF_EN
39 16
GND3 VDDXO2V8 C439
40 15
FSYS1 26MHZ_MCLK
14
GND4 GND1 1000p
41 13
X400 NX3225SA
4
3
GND2 HOT2
1 GND1 2
HOT1
26MHz
BT_CLK
RF_CLK
RF_DA
QX
Q
IX
I
4 5 6
7 8 9
22K
RF_TEMP
10K
VBAT
C403 C405
C404
1u 33 uF
27p
TQM7M5005 U400
15 7
PGND GSM850_900_IN LBAND_PAM_IN
8 6
GND3 TX_EN TXON_PA
11
GND2
14 5 R405 10K
GND1 VRAMP PA_LEVEL
9 4
BY_CAP2 VBATT
13 3
BY_CAP1 BS PA_BAND
10 2
GSM850_900_OUT MODE_SELECT PA_MODE
12 1
DCS_PCS_OUT DCS_PCS_IN HBAND_PAM_IN
C416 C417 C412 C418
C420 TQM7M5005(5x5) 47p 100p 100p 100p
0.01u
BT_RESETn
7 8 9
- 118 -
10 11
BLUETOOTH_FM_MODULE(TAIYO YUDEN)
C438 100p
FM_ANT
C441 C442
DNI DNI
ANT401
C460 DUMMY2
FEED
1.5p DUMMY1
VBAT 2V62_VIO
2V65_VBT 2V65_VBT
C450
1u
C449
1u
BT_LDO_EN
CLK32K
0.1u C446
BT_CLK C452
1000p C448
1u
C451
1u
6
BT_ANT
32
FM_ANT
16
FM_SND_L VAFL
15 11 TP403
FM_SND_R VAFR UART_CTS UART_BT_RTS
33 10 TP402
RESET UART_TX UART_BT_Rx
8 TP404
C447 UART_RTS UART_BT_CTS
1 9 TP401
1000p GND1 UART_RX UART_BT_Tx
5
GND2 M1
7 4
GND3 EWFNLBAXX PCM_SYNC_I2S_WS I2S1_WA0
12 3
GND4 PCM_CLK_I2S_CLK I2S1_CLK
20 38
GND5 PCM_OUT_I2S_OUT I2S1_Rx
31 2
GND6 PCM_IN I2S1_Tx
39
PGND1
40
PGND2
41
PGND3
42
PGND4
10 11
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
A
B
C
D
E
F
G
H
12