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Before that the printer was left unused for longer periods of time (sometimes), but never had any serious issues with print quality and/or missing colors. I have purchased new Matte Black, replaced it and did more investigation that came with the following facts and conclusions:ġ) Matte Black is printing perfectly, no clogged nozzleĢ) Photo Black still missing the whole block on the nozzle check printģ) Since the printer has 9 inks and only 8 color nozzles, Matte and Photo Black are using the same nozzle (obvious, but came to me only later - I was really scared that my printhead is clogged), therefore it cannot be the clogged nozzle that's causing the problemĤ) Photo Black ink was in use on fairly regular basis (at least once a month recently). I thought that, because of this very old ink, something got clogged. As most of my prints (like 95% of them) are done on glossy media, the Matte Black is in very rare use: the cartridge that came with printer in 2009 or so was still in use. I have cleaned the printhead with isopropyl alcohol and lint-free wipes (was a little dirty but no excessive dirt). I did a nozzle check, and the first block of black was missing completely. After quick investigation I have discovered, that not all blacks are printing. Last week my beloved SP 3800 started acting weird - pictures didn't look as "awesome" as always.