The 1990s Marantz CD52mkII player has a known issue where the tray loading gear wears out over time. The result is a juttering eject/load or non operational CD tray. The same CDM-4 tray mechanism was used in a number of Marantz and Philips CD players at the time.
The image at the top shows the original gear cog worn down with its teeth chewed away and below is a video showing the before and after on the tray eject and load.
The repair is relatively simple and consists of a few Philips and Torx (using a small flat head driver will undo these) screws, sliding out the CD tray and then replacing the gear cog (see links below for original instructions). The CMD4 transport gear cog/wheel is still readily available from some UK sources as well as ebay (~5GBP)
Further info:
www.pinkfishmedia.net/forum/showthread.php?t=125641
www.vintage-radio.net/forum/showthread.php?t=45664
hifisoundscd52.blogspot.com/2013/04/the-teardown-replacin...
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