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They should both have the same standard format, but my best guess is you may have recorded one MD in one of the sony longer formats which the Tecnics can't read. The normal MD Decks may not have the old sony extended paly format and even some of the Sony high end decks don't have all of the formats. Sony tried several says to give more recording timje on a disc before migrating to the HiMN standard as an example.
Possible that the disc is not reading and so the the TOC- table of content error must be referred.
It can be due to a poor head tracking or the failure of the data being read or processed.
Clean the head and use a good disc to be checked once again. If so the optical head can be faulty as it might be getting weaker.
Unfortunately you've done all that you can. The unit is broken and parts are unavailable, even if they were, portable MD players were always fiddly and labour intensive to repair.
It's not all bad news though: as they're obsolete technology there are millions of perfectly good ones lying around unused and unwanted. Every single bit of minidisc equipment which I own has come from my local FreeCycle and Freegle groups, either as a response to an offer or via a request (but note that all such groups usually insist that you must make an offer before you can post a request, but there's no restriction on replying to offers already made).
Inside all MD players are a number of small pinswitches. These sense whether the MD is correctly inserted, whether the record protection tab is activated and whether the protective slide on the MD has retracted after MD insertion. On Other (portable) MD playback devices will also have a pinswitch which checks that the lid has been closed, but yours is slot loading so does not have this.
Pinswitches do not last forever as the internal parts can fail due to fatigue or due to misuse, and in every MD player which I've examined with the symptoms you describe the fault has either been a pinswitch or a faulty solder joint to the switch.
Without examining the unit though it's not possible for me to narrow down the fault any further but if you have basic electrical skills and tools you can use a continuity meter across each pinswitch to determine which one is not working correctly.
The part is cheap: original spares are usually unavailable but can normally be replaced with a generic item or bypassed altogether if the user is prepared to accept minor losses in overall functionality.
Note that a good used MDS-JE480 is still relatively easy to find: my first one cost me just £30 on eBay less than two years ago and since then I've acquired another which was listed on FreeCycle for the princely sum of zilch. Yamaha and Kenwood units are also knocking around although few of these have the MDLP capability of the JE-480. So don't bother with spending much on repairing your current unit without looking for another replacement first as it's likely to be the cheaper option.