When printing a red line appears about every 8mm through the all of the page i am useing a epson rx630 fred

It means some nozzle not perfect. If you check nozzle, there is missing lines for some nozzle. Example : Print blue color ( 100% cyan + 100% magenta). If some point of cyan head is clog, the output will be shown that at some lines just show magenta. It repeated. Yous said every 8 mm, so, you must print it at best photo quality. If you have print at best photo quality, and lines still appear, it must some nozlle badly clog. Try do head cleaning, wait for 30 minutes. Check Nozzle.