I have several computer CD/DVD drives with sticking trays. Problem happens right at the start when it can't separate the spindle from the disk. Usually works with a disk inserted, but always sticks when empty.
There's a powerful magnet holding the disk down on the spindle. I tried shimming it so it would be further away from the spindle when no disk is installed and exert less force. By the time the sticking problem is reduced, there isn't enough force to keep the disk held down on speed variations.
I tried a mag tape demagnetizer on the magnetic top clamp with no effect.
I've seen several of these. They all say "super multi" somewhere in the name. Mechanisms look pretty much the same.
This particular one is a HP GH40L. LGE-DMGH22LS40(B)
I've taken 'em apart, cleaned/lubed/checked for rough surfaces etc. The ramp on the opening mechanism is steep right where the disk clamp separates. The carriage moves down a fraction until the magnetic clamp on the top hits the top cover. Instead of separating, it just hangs up. It's not the belt, the motor stops dead in its tracks.
Would be nice not to have to send these perfectly reading/writing drives to the landfill.
Ideas?