I used this several years ago. Power-on check not performed. As I am not a professional, I have not performed specialized condition checks or precise maintenance. I appreciate your understanding. * Please be aware that there is a possibility of defects or that it may be a junk item (although I will pack it carefully, especially during shipping). As this is an important item, it may take some time to prepare for shipping. I will try to let you know an estimated timeframe. If you have any questions, please feel free to comment. ^_^