1.3 No sound1) No audio signal output to the AV input circuitCheck the audio signal at pins 1 and 13 pins (CG1), 5 and 14 pins (CG2), 2 and 12pins (VIDEO) of IC5011 of the AV unit.Check IC5011 and its peripheral circuits.2) Input mode switching errorCheck the AUDIO_SW1/AUDIO_SW2 switching signal at pins 9 and 10 of IC5011. Theswitching signal is output from pins 4 and 5 of IC1801. See the table below for inputmode switching.3) No audio signal output to the speakerCheck the audio signal at pins 3 and 4, 1 and 2 of K16U of the drive unit.Check the MUTE signal at pin 8 of K16R/K8T.The MUTE signal is output from pin 48 of IC1801.Mute ON: HighCheck the MUTE signal at pins 3 and 4 of IC1652.Check the VOLUME signal at pin 7 of K16R/K8T.The VOLUME signal is output from pin 15 of IC212 and controlled by IC801 throughthe IC bus.Volume minimum: LowCheck the audio signal at IC1651, IC1631 and IC1632 and peripheral circuits.4) No power to the audio circuitCheck the 6V power supply (6V AUDIO).Part 4: Troubleshooting4-7IC1652AUDIOCONTROLIC1651PRE.AMPIC1632R-AMP.IC1631L-AMP.IC5011AUDIO-SW514113212910313PC_L/RPC_L/RAV_L/RQ5008Q5007VOLUME SCL/SDAA_MUTEA_SW1A_SW2AU_SW2LAU_SW1RLRLR5551417141771015 17262IC1801I/OEXPANDER 54IC212D/A 15 3249IC801MAINCPUCOMPUTER2AUDIO INCOMPUTER1AUDIO INVIDEOAUDIO IN37 813412K10T K16SK16RK8T41423940K10Q K8BK16UAV BOARDM DRIVE BOARDMAIN BOARDMUTE On: H12 3,14SPEAKERS29, 30Fig. 4-3IC5011 truth tablePin 10 Pin 9 ModeL L COMPUTER 1H L COMPUTER 2L H VIDEO
