Just my few cents here. Everyone says that the laser needs to be replaced but I found that not to be necessary at all.
I was given a Beosound Century by a lady for free (my luck), and she said that the CD didn’t work (well, the cassette also had problems and the remote control also had issues, all of which were easy to fix). True enough. It would spin a few times and refuse to play most CDs. I came across a video on YouTube that showed how to clean the lens and the mirror behind it, and that did the trick. It was a bit fiddly but not too demanding even for a novice. The video is here: https://youtu.be/qXGubkovMEE?t=345
