Ok, found my fathers ooolllddd CD player in the attic, and wanted to use it.
It uses the KSS-210 laser, but it just won't budge.. At first, it played a CD, but sounded very scratchy, then it gave up and said "NO DISC" when there was one inside..
So, upon inspecting, when I insert a CD, it spins for a second, then I hear a "clunk" and the drive just stops with "NO DISC".. Thing is, it DID see a CD, because when there really is no disc, it will spin the motor THREE times, where this it does spin up and the PLAY logo appears, but it just gives up...
Diode gone? There's still a faint red glow from the diode.. I tried adjusting the pots very carefully, and one way resulted in not even seeing the disc, and the other made it play a CD, if the drive was tilted at a 45 degree angle, though scratchy and skipping.