I have the same. My display only displays a certain number which I do not recollect. It did not work when I bought it years ago. Although the Onkyos from that era were incredible builds with great quality, The present knowledge regarding them seems to be limited. I put a request on AK, way back when, for anyone that had worked on a TX8500MkII. I got a total of 0 responses. Mine sits on a shelf and sneers at me. Good luck to you.