LG KG280 Service Manual - Page 68
Earphone Trouble
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4. TROUBLE SHOOTING 4.11 Earphone Trouble TEST POINT CN300 U301 U300 U302 U303 CIRCUIT Figure 20 JACK_LDO_EN 2V8_VEXT R301 4.7K R302 100K C303 1u U302 1 3 VDD VOUT 4 NC 6 CE GND1 2 GND2 5 C304 R1114D251D 0.1u EUSY0299301 2V6_JACK C305 C306 1u 15p EAR-MIC ECCH0004904 ECCH0000182 ECCH0004904 ECCH0000112 2V6_JACK EAR_MIC_IN FB302 0 EAR_MIC EAR_MIC R305 1K R306 1.5K C309 39p C307 0.1u C308 R307 100ohm 22uF 2012 ECTH0004806 R308 C313 47n C314 27p C315 39p 100ohm AUXIN AUXIP 2V8_VEXT SPK_SEL C300 33 uF R300 0 U300 6 S ECTH0004804 1 B1 5 VCC GND 2 4A B0 3 R325 C302 NLAS4157DFT2G NA 1u EUSY0263301 HEADSET_R FM_AUDIO AUXOP U300 SPK_SEL L STATE A-B0 H A-B1 2V8_VEXT AUX_ON AUXON HEADSET_R C301 1u U301 2 NO1 10 NO2 5 IN1 7 IN2 1 VCC 11 6 PGND GND COM1 3 COM2 9 NC1 4 8 NC2 MAX4764ETB HEADSET_EN USC5 MMI_PIN4 MMI_PIN5 USC4 USC5 R326 NA U301 HEADSET_EN 0 STATE USC 1 HEADSET_SPK Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes - 69 - LGE Internal Use Only
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