The B200 error on a Canon MP620 printer indicates a problem with the print cartridges. The most effective way to correct this error is to replace the print cartridges.
Other ways to correct the B200 error code include cleaning the contacts on the existing print cartridges, cleaning the print head and reinstalling the printer's driver on the computer. The print head can be cleaned with a cotton swab and a solution of water and rubbing alcohol.
To reduce the frequency of future B200 errors, users should not install cheap print cartridges and cartridges that are nearly empty. Cheaper cartridges tend to leak more and gum up the print head.