Chosen Solution
The test page has four smudge lines (about half an inch width) across the printed page. it seems a roller where the page passes through either has excessive toner (dirty) or the Toner cartridge itself is defective. I need to remove the fuser to see if the toner residue resides there.
Hope this helps you https://usermanual.wiki/Dell/dellp1500.6… or you can always call the support team for the same
