hm, like a " hot PCB Plantine " smell or something … ?
If you have an M which you do, everytime you startup the fans should turn of for a few seconds. this can emirate that electronic smell. Its not a burning smell but close to it. I know exactly what your talking about. I was concerned the first few times I started up my players but now im used to it.
This also happens when im playing ill notice a smell and put my nose down to the player and you can smell the same thing again until the fans turn off which is in a few seconds