Last weekend I fixed my Xbox 360 and a pair of HP LaserJet P4015s; interestingly enough, they had a similar problem.
The Xbox wouldn’t eject the optical drive. I thought the whole drive had failed, and disassembled the Xbox. However, the drive would eject fine once the case was off. I did some more research online, and found a YouTube tutorial that showed how to remove the little rubber band / drive belt that runs the eject function from the front of the drive, wash it, and replace it. Worked perfect.
The LaserJet P4015s were jamming as they were feeding labels from tray three through tray 2. The fix was to remove tray 2, and clean the rollers in the top of tray 3 with adhesive remover.
At any rate, both problems were caused by rubber components being covered in some sort of residue that was preventing proper movement.
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