3.13.2 Microphone circuit
3.13.3 Headset circuit
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3. TECHNICAL BRIEF
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
[Figure 3.13.2-1] Microphone circuit diagram
MAIN MIC
1608
C409
39p
G1
2
3
G2
4
G3
G4
6
1
OUT
PWR
5
SPM0204LE5-QB
MIC401
0.1u
C414
VMIC_P
100nH
L401
DNI
C410
39p
C421
0.1u
C419
39p
C413
C408
10u
39p
C422
VMIC_GND
MAIN_MIC_N
MAIN_MIC_P
VMIC_GND
[Figure 3.13.3-1] Headset circuit diagram
Short = KP270
7 : USB-/Remote_ADC/MON_RXD
12,13 : CHG
11 : R/ON
8 : JACK_D
16 : UART_TX
FOR RADIO
18PIN MULTIPORT RECEPTACEL
3 : Jack type
9,10 : BATT
15 : VUSB
5 : HSO_R
6 : USB+/Remote_INT/MON_TXD
17 : UART_RX
4 : HSO_L
DNI = KP275 series
14 : DSR
2 : Headset MIC
C313
1800
FB307
10u
270nH
L301
R308 2.2K
5
6
7
8
9
11
12
13
14
15
16
17
18
19
2
20
21
22
3
4
CN301
1
10
R334
DNI
1800
FB306
22n
C310
2V5_VAUDB
USB_VCHG
22n
C309
DNI
R305
39p
C314
C303
39p
NFM18PC104R1C3
FL303
GND1
GND2
IN
OUT
FB303
1800
DNI
R333
100nH
VBAT
L302
C301
1u
C312
39p
10K
R306
VA301
PRSB6.8C
1800
FB302
10p
C305
PRSB6.8C
VA302
1800
FB305
100K
R304
1800
FB301
1u
C302
C315
1.5K
39p
R307
FB304
1800
2V62_VIO
VCHG
24p
C306
10K
GND1
GND2
IN
OUT
R303
NFM18PC104R1C3
FL302
C304
1u
HSO_L
HSO_R
A_MON_TX
A_MON_RX
MULTI_PORT_0
FM_ANT
JACK_TYPE
JACK_DETECT
UART_RX
DSR
UART_TX
RPWRON_EN
MULTI_PORT_1
HS_MIC_N
HS_MIC_P