Arnaud Dupin de Beyssat 

Arnaud Dupin de Beyssat said:

How can I simply scan, list and correct it ?

You can't I'm afraid.  If you want to do this sort of a check on your TM then your best bet is to split it up into bite sized chunks as multiple TMX files.  Then create a project using the TMX files, making sure the update checkbox for the TM is unchecked, and spell check them.  Then correct them in the Translation Memory View.  You can find more info on this process in this article - https://multifarious.filkin.com/2013/03/15/memory_wisdom

Not ideal I know, but your choices are limited as the Trados Studio Translation Memory Editor doesn't offer spell checking or any other QA mechanism.  Probably because you would normally have updated your TM after a project was correct and complete.  So it shouldn't be needed.

Unless of course with this:

Arnaud Dupin de Beyssat said:

I have a TM with several incorrect spelled terms in Target.

You actually know what the terms are?  If you do then you can resolve this by creating a search filter and then use that filter to "batch edit" and replace the terms across the entire TM in one go.

OK. MAny thanks, Paul. May be I'll try

Hi Arnaud Dupin de Beyssat 

Another approach consists in installing the plugin "Filetype definition for TMX" in Studio. 
This will allow you to open the TMX like another document in the Studio Editor and run a spellcheck on it (F7).

This works fine as long as your TM is quite small. Large TMs may either take ages to load or even not load into the Editor or even trigger an out of memory error. 
To avoid this, follow Paul's suggestion and slice your TM in processable chunks, 

On the other hand, if your TM chunks are not too big and load well in the Studio Editor, this method may run faster than using the TM Editor.

Thank you, Walter. It seems work fine. But my problem now is how to slice the TM in processable chunks?

Regards