A laserdisc player with the lid removed. There's a U-shaped piece of plastic which has the disc rest on it when playing, but there's a square cutout at the back for a big transformer, with a metal strip behind it, forcing the tray to lift up before it can slide out
https://digipres.club/system/media_attachments/files/111/824/257/915/126/234/original/a753b5e203d6fe17.png