Lasers always seem to take the blame. While that might be the problem, more often the problem is mechanical. Sleds and pivot points get dry. They need to be cleaned and lubed. While you're at it clean the laser lens. Search the web. I recall a great site that gave great advice on this exact type of thing.
Shanling SCD-T200 not reading discs
I bought a Shanling SCD-T200 in 2005 and it has performed flawlessly until recently. I am the original owner and no mods have been done. Everything seems to work except it began reading only some discs. Some discs I was able to play if I gave the disc a quick spin to start it, and now it will not read any disc. It gives me the error message no disc inserted. I am not an electronics expert. Has anyone had this problem? Is it fixable, or do I have a new, beautiful boat anchor? Any help would be greatly appreciated.