I see I'm not the only one who has come up against this problem, but it's the first time for me. I have scanned a couple of vintage parts books with line illustrations for my chap and saved the pages to several pdf files. On printing out later, I find that they are printing in dark blue rather than black. Swapped over the black cartridge - same. Tried greyscale and the print is black sure enough, but the definition has gone from the shaded sections of the line drawings. Would the original scanning be at fault? I used the same all-in-one for both actions.