![](https://pic1.mangapicgallery.com/r/avatar/0a/u5956_50x50.jpg?2)
If I'm not wrong :
Quality checking is the last stage before the release. Like you said you have to verify the text and look for every mistake, even the tiny one (like two .. instead of .) but you also have to check the quality of the whole thing, look if no bubbles were forgotten, look if the cleaning & redrawing where done right ... In short you have to make sure everything is perfect and ready to be posted ٩(๑❛ᴗ❛๑)۶
Is Quality checking just making sure words are spelt right and the sentences make sense? (last page of manga)