So I'm trying to print 100 envelopes, and like always, my li'l MX922 is hummin' right along. Then, the dreaded B200 shows up! This is what happened to my last Canon years ago. It just stopped working, and I eventually threw it out. The window. But I decided to try to get this thing to get me through this one print job. So in desperation, here is what I did:
>>> Turn the printer off.
>>> Open printer cover and the bottom part where the ink goes.
>>> Unplug the printer from power.
>>> Browse Auto Trader for a couple of minnutes, since I'm in the market for a new(er) ride. This part is optional, I guess.
>>> Grab the ink carriage with two fingers and slide it back and forth a couple of times, about an inch or so.
>>>Leave everything open.
>>> Plug in the power
>>> Press "Power" button to turn it on.
>>>As it cycles, it'll display a message letting you know that the cover is open. That's a good sign. Close the cover.
>>>If it continues through the startup process, it should resume printing.
BUT!!!
>>>If you were printing a multi-page job, it will re-start that job from the beginning. So adjust accordingly.
After 20 or 30 pages, I got the B200 error agin. I repeated the steps, and it worked fine.
I have no idea which one of these seemingly useless steps was actually the thing that made it work, but that is what I did, and this little process made it work. I probably need to look at replacing my MX922, since it's maybe five years old. But I needed these envelopes printed TODAY, and this sequence made it work.
Good luck!