I want to thank user Takhnamishvili from bottom of my heart! You solved the problem! Life stop setting made the trick and now machine also warns me that black drum unit needs to be replaced. Now I have to buy it and figure out how I can set the machine to understand that I print A4 and A3-sized documents and not something like 8"*11" documents

Thank you all who helped me out with this. As told, I learned a lot already and will definitely follow and support this forum to learn more.
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