LG KM710 Service Manual - Page 84
MIC Trouble Shooting
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4. Trouble Shooting 4.12 MIC Trouble Shooting z MIC Operation scheme is shown below. VBAT VCCS VBAT D7 A10 VBATS ICTLUSB1 D8 C9 ICTLUSB2 ICTLAC1 D9 C8 ICTLAC2 B9 VBATS C114 33u C115 22p MICIN MICIP D2 D1 HSMIC C1 E3 MICBIAS HSMICBIAS E2 C2 AUXI_FMR FML D3 G2 EARN EARP G1 F3 AUXO HSOL F1 E1 HSOR HSOVMID F2 F4 AUDVMID FILTERAPLL L1 SPKPA1 G3 G4 SPKPA2 SPKNA1 K3 K4 SPKNA2 H1 L100 100nH MICBIAS HSMICBIAS RCV_N RCV_P C120 22u C121 R124 15K C123 47n C124 4.7n SPKPA SPKNA HSMICIP C119 100p 22u C127 4.7u R160 220 R161 C122 47p 220 C125 27p 27p C116 C117 100p 27p C118 ABB_MICN ABB_MICP C126 27p ABB_HSOL ABB_HSOR MICBIAS MIC_P MIC_N DNI C629 C634 27p MIC C628 27p C630 0.1u C632 0.1u L603 100nH L604 100nH L602 100nH C631 27p C635 27p C633 27p C636 27p VA600 C637 EVLC14S02015000p C638 10u MIC600 1 OUT 2 G1 3 G2 4 G3 5 PWR 6 G4 SPM0204LE5-QB z MIC signal flow - MIC is enable by MICBIAS - MICBIAS Signal from ABB(U103). - MICIN, MICIP signal from MIC(MIC100) z Check Point - MIC bias - Audio Signal level of the Microphone - Soldering of Components Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes - 85 - LGE Internal Use Only
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