Only For Training And Service Purposes - LG KP270 Service Manual

3.13.2 Microphone circuit
3.13.3 Headset circuit
18PIN MULTIPORT RECEPTACEL
2V5_VAUDB
R307
1.5K
C309 22n
HS_MIC_N
R308 2.2K
C310 22n
HS_MIC_P
C312
C313
39p 10u
Copyright © 2008 LG Electronics. Inc. All right reserved.

Only for training and service purposes

MAIN MIC
VMIC_P
L401
100nH
MIC401
6
G4
5
PWR
4
G3
3
G2
2
G1
1
OUT
SPM0204LE5-QB
[Figure 3.13.2-1] Microphone circuit diagram
2V62_VIO
FB301 1800 JACK_TYPE
HSO_L
HSO_R
FB303 1800 MULTI_PORT_0
MULTI_PORT_1
C314 C315 JACK_DETECT
39p 39p
RPWRON_EN
DSR
UART_TX
UART_RX
[Figure 3.13.3-1] Headset circuit diagram
3. TECHNICAL BRIEF
C408 C409
C410
DNI
10u 39p
1608
VMIC_GND
C414 0.1u
MAIN_MIC_N
C413
39p
C419 0.1u
MAIN_MIC_P
C421 C422
39p
39p
VMIC_GND
USB_VCHG VBAT VCHG
FL302
C301
1u
C303 C304
39p 1u
C306 24p
L302 100nH
FB302 1800
FB304 1800
FB305 1800
FB306 1800
FB307 1800
- 47 -
FL303
C302 FOR RADIO
1u
FM_ANT
R305
C305
L301
10p
DNI
270nH
CN301
Short = KP270
21 DNI = KP275 series
19
1
2
2 : Headset MIC
3
3 : Jack type
4 : HSO_L
4
5 5 : HSO_R
6 6 : USB+/Remote_INT/MON_TXD
7 : USB-/Remote_ADC/MON_RXD
7
8 8 : JACK_D
9
9,10 : BATT
10
11 11 : R/ON
12
12,13 : CHG
13
14 14 : DSR
15 15 : VUSB
16 16 : UART_TX
17 17 : UART_RX
18
20
22
LGE Internal Use Only