This is a fairly generic error code that can indicate a number of different issues, but most often it seems, it indicates a tank or printhead issue. Before replacing the printer, I would try out the advice in this thread, as you may be able to get it going:
http://community.usa.canon.com/t5/Office-Printers/Canon-MX860-repeats-B200-error-code-brought-it-bac...
Good luck. If you get it fixed, post back and say which fix solved it for you.
