I submitted it because I felt that you just don't see this kind of detail provided with electronics today. It amazed me to see the circuit boards and every detail of the stereo laid out in fine detail. It shows how in the past things were just different in terms of build quality and ability to repair things. Now days things have planned obsolescence and we are expected to replace the whole item. This service manual is for an old Sony stereo I just found on FB marketplace for $30. I found it interesting is why I posted it and thought others might as well. Thanks