Sanyo PLC-XP45 Service Manual

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-39-TroubleshootingIC1652AUDIOCONTROLIC1651PRE.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, 30No Sound1. No audio signals at AV input circuit.Check audio signals at pins 1, 13 (CG1), 5, 14 (CG2) and2, 12 (VIDEO) of IC5011 on AV Board. Check IC5011 andperipheral circuits.2. Incorrect operation of Input mode switching.Check AUDIO_SW1/AUDIO_SW2 switching signals at pins9 and 10 of IC5011. The AUDIO_SW1/AUDIO_SW2 sig-nals are output from pins 4 and 5 of IC1801. See the truthtable below for input mode selection.3. No audio output signal at speakers.Check audio signals at pins 3, 4 and 1, 2 of K16U on MDrive Board.Check MUTE signal at pin 8 of K16R/K8T.The MUTE signal is output from pin 48 of IC1801.Mute On : HighCheck MUTE signal at pins 3 and 14 of IC1652.Check sound volume signal at pin 7 of K16R/K8T.The VOLUME signal is output from pin 15 of IC212 and itis controlled by IC801 via the IIC bus.Volume Min.: LowCheck audio signals at IC1651,IC1631, IC1632 and periph-eral circuits.4. No power supply at audio circuit.Check 6V(6V AUDIO) power supply line.Logic Table of IC5011Pin 10 Pin 9 ModeL L COMPUTER 1H L COMPUTER 2L H VIDEO