B200 on Canon PIXMA models indicates a printhead problem — often overheating, a clog, or an electrical fault. Cleaning and reseating the printhead resolves many cases.
Work through these in order; most people are fixed by the first two or three.
Turn the printer off, unplug for 5–10 minutes, then power on. This alone clears some B200s.
Open the cover, remove the cartridges, then lift out the printhead. Rinse the nozzle area and contacts with warm distilled water, dry fully (30+ min), and reinstall.
Lock the printhead back in place and reinsert cartridges until they click.
If B200 returns, the printhead is likely failing and needs replacement (often the practical fix on low-cost models is a new printer).
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