I’ll just add my 2c to the replies you’ll already find here. In my case the B200 error was returning even after the lift cover/turn ON/lower cover after carriage passes the halfway point solution. I had cleaned the printhead once a few years back, so was already somewhat acquainted with the process. This time around removing the printhead and soaking it (wi distilled water, then again wi distilled water + some ammonia), for better than a day, then allowing to sit & dry, then installing all new ink cartridges except for one,,, did NOT resolve the error. So I did it all again, this time using distilled water and isopropyl alcohol (abt 50-50), 4x, with some rinsing between baths, AND the use of a syringe & plastic hose aimed at the ink orifices, another complete drying, and then some compressed air directed at both the orifices and the nozzles, and then being careful to ensure to re-install the printhead in the carriage making sure it was fully & firmly seated, and then replacing the one cartridge I hadn’t replaced the first time. Now the printer is working fine again. Lesson learned: I needed to get aggressive with the printhead cleaning, even after it was rinsing clean and I thought I had all the ink out. The Pixma is about 10+yo. FNO, I’m going to be careful to print something at least 1x/wk and do a nozzle cleaning 1x/mo.
