Mic Trouble Shooting - LG KE520 Service Manual

4.12 MIC Trouble Shooting

z MIC Operation scheme is shown below.
D2
MICIN
D1
MICIP
C1
HSMIC
E3
MICBIAS
E2
HSMICBIAS
C2
AUXI_FMR
D3
FML
G2
EARN
G1
EARP
F3
MICBIAS
MIC_ABB_P
MIC_ABB_N
z MIC signal flow
- MIC is enable by MICBIAS
- MICBIAS Signal from ABB(U102).
- MICIN, MICIP signal from MIC(MIC600)
z Check Point
- MIC bias
- Audio Signal level of the Microphone
- Soldering of Components
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
C113 0.1u
MIC_ABB_N
C114 0.1u
MIC_ABB_P
HSMICIP
MICBIAS
C115
HSMICBIAS
RADIO_R 100p
RADIO_L
RCV_N
RCV_P
L600
100nH
L601 100nH
C600 0.1u
C601 0.1u
L602 100nH
C602 C603
27p 27p
ESD9X5.0ST5G ESD9X5.0ST5G
- 97 -
4. TROUBLE SHOOTING
C113
C114
MIC600
1
OUT
2
G1
3
G2
4
PWR
5
G3
SP0204LE5-PB
LGE Internal Use Only