a friend of mine has an very oldschool CD Player, a Sony CDP 770 from 1988. With the time, the laser and the lense has degraded and hearing music without any interruption isn’t possible anymore.
I decided to look for a new laser pickup and found a spare part for the original RSS-150A, I shot a new RSS-210A by ebay for about 20€. Let them give it a shot!
Here are the steps to replace the pickup. You only need 2 skrewdrivers. Open the chassis by loosing the 4 skrews in the cover, 2 at each site.