Thanks very much for the reference for that teardown image! It looks to me that the sound I hear is coming from what appears to be the RAM area, which is odd.
The background noise is because this is in a well-ventilated closet in my flat and I had the window open nearby - the DEC850 isn't in a rack and there is no power brick near the sound area, there's nothing at all. And picking up the DEC850 has the sound follow the unit, coming from exactly the same location. Very peculiar indeed...
The background noise is because this is in a well-ventilated closet in my flat and I had the window open nearby - the DEC850 isn't in a rack and there is no power brick near the sound area, there's nothing at all. And picking up the DEC850 has the sound follow the unit, coming from exactly the same location. Very peculiar indeed...