I recently bought a NEC CD-510, built in 1987. It was very clean and came with the remote and the original owners manual. The very honest seller told me the "CD door was sticking". As is my habit when I buy a vintage piece of equipment I took the cover off as soon as I got it home to blow out the dust from the inside. It was clean. So clean that I didn't need to blow out the non existent dust. So I plugged it and and attempted to open the CD door and sure enough it was stuck with the tell tale whirring of the drive belt in motion but slipping on its capstan. I removed the belt and cleaned it with Ru-Glyde rubber cleaner and reinstalled it and the CD door now opens and shuts. On to a hookup with my system and a test run with a good quality CD. This old player has a Burr-Brown DAC chip and it sounds really good. I own three CD players, of which this one is the earliest build date, and the NEC is the best sounding to my ears, less strident in the highs and warmer overall. Anybody out there have any NEC experience which agrees with mine or am I just hearing what I want to hear?