LG KE990 Service Manual - Page 106
Voice path for headset
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4. TROUBLE SHOOTING 4.11.2 Voice path for headset Voice path for Head_Set as below: ESM6270 HPH_R, HPH_L → C548,C549 U502(audio codec) → C578,C562 → R529,C522 → U504(Headset AMP) → FB502, FB503 → R525, R524 #4, #5 pin of CN500 headset Jack Start Connect the phone to network Equipment a nd setup c all Setup 1KHz tone out And inse rt head_ Set Headse t insertion detec tion NO in the Main LCD Display OK? Check #8 pin o f CN500 or change the M ain b'd YES The sine wave appear at C548,C549 ? NO Change th e Main board YES The sine wave appear at NO Check t he U502 C578,C562 ? or ch ange th e Main b' d YES The sine wave appear at NO Check t he U504 R525,R524 ? or ch ange the Main b' d YES Can you hear th e tone? YES END NO Check t he CN500 or change the Main b'd Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes - 107 - LGE Internal Use Only