LG KE520 Service Manual page 102

z Ear-Mic Headset 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
AUXO
F1
HSOL
E1
HSOR
F2
HSOVMID
F4
AUDVMID
L1
FILTERAPLL
G3
SPKPA1
G4
SPKPA2
K3
SPKNA1
K4
SPKNA2
H1
SPKPD1
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
C113 0.1u
C114 0.1u
MICBIAS
HSMICBIAS
RADIO_R
RADIO_L
RCV_N
RCV_P
C116 100u
C117 100u
R124 15K C118 47n
C119
C123
C120 4.7n
4.7u 47p
SPKPA
SPKNA
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4. TROUBLE SHOOTING
MIC_ABB_N
MIC_ABB_P
HSMICIP
C115
100p
L100
100nH
L101
100nH
C121 C122
27p 27p
HSOL
HSOR
LGE Internal Use Only