Your 520 was a great machine, it is older and many are worn out. It sounds like a loader problem, you can take the top off and access the loader mechanism, if you remove the inside cover you should be able to pull out the disc.
In all likelyhood the recording head is work out or damaged, so be careful with the disc. Most discs will still work if carefully removed, don't get your fingers, dust or hair in the open shutter space on the disc, it is open when inside the machine or you'll mess it up form being read on another machine.
Since you can still play it try doing an analog copy of it by hooking up the audio out to a DAT, CD or other Minidisc unit capable of recording the songs before you start tinkering with the mechanics, so you'll have a backup.
Good Luck!
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