Reset the printer. Unplug it and leave it disconnected for at least 30 minutes. A good, long reset allows the printer to cool down and restore everything to its proper position before turning the device back on.

Remove any obstructions. There's a possibility something is disrupting the connection to the printer head. Open the printer's door, carefully disconnect the print head, and lift it out of the device. Reseat it and see if that fixes the issue.

Clean the printer head. Use the device's maintenance options to run its cleaning cycle. It's handy if the printer head is clogged.

Manually clean the print head. Use pure alcohol or a non-oil-based cleaner on the print head's gold contacts. Use a microfiber cloth to rub the cleaner onto the contacts, then let it dry completely before reconnecting.

Remove old ink. There may be hardened ink trapped inside the print head. Run it under hot tap water until the water comes out clean. Dab it dry with a paper towel, then reinsert the head into the printer.

Re-install the printer drivers. Find your device on the official Canon support page and follow the directions for updating the drivers.

Try a new ink cartridge. Faulty cartridges rarely trigger the B200 error, but it can happen. Refer to the user manual for this process regarding your specific device.

If none of the above methods work, the B200 error is probably accurate. It's time to shop for a new printer.

Hope This Helps,
Peter