SD-PX15H (serv.man18). Flowchart - Sharp Audio Service Manual (repair manual). Page 5

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SD-PX15H
7 – 5
• Audio is not output normally.
Put a disc on the DISC tray.
    
Yes
Is audio signal output to each pin of main unit connector CN4002 
?
CN4002    1 pin    LOUT
CN4002    3 pin    ROUT
No
Check main unit. (Circuits around IC4101.)
    
Yes
Is audio signal output to each pin of IC413?
IC413    11 pin    LIN1
IC413    12 pin    RIN1
No
Check line from CNP401 to each pin of IC413.
    
Yes
Is audio signal output to each terminal of IC413?
IC413    54 pin    L-OUT
IC413    47 pin    R-OUT
No
Check circuits around IC413 or replace IC413.
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