I have a PIXMA TR8520 printer. All of a sudden, lines began appearing on the printed paper. Holding a sheet of 8 1/2 x 11" paper vertically, the lines run from side to side. They seem to appear only on photographs - not on text or other graphics. When printing in color, each line and the space next to each line is about 1/8" thick. Each line is light green in color. The lines and spaces are repeated across the width of the paper, though every other line tapers off before reaching the other side of the paper.
When printing in B&W, each line is the width of a hair and the space between each line is almost exactly 7/8". The lines and spaces are repeated across the width of the paper.
I did a cleaning, deep cleaning, roller cleaning, and bottom plate cleaning. When I did a "Print nozzle check pattern" (both before and after doing all the cleanings), the printout was normal.
I have replaced all the ink cartridges with new ones. The same problem occurs with them as it did with the old cartridges. I bought the printer in June 2021. Up until a few days ago, when the problem first started, there had been no printing problems.
