My Canon printer went into a service centre for a new print head yesterday. Canon Pixma printers are known to have print head issues and a Class Action lawsuit happened in the USA and the users got $25 each. I tried all the known tricks to fix, but nothing worked. I was getting the well known B200 Error and also a 1403 Error which tells you you have the wrong print head.
New head is $127.57 plus $45 to fit. A new printer is $118, but I have $160 in serviceable cartridges.
Try this which was written by someone else, but can work
So I'm trying to print 100 envelopes, and like always, my little MX922 is humming' 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 minutes, 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 start up 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 again. 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!
Here is advice specific to your machine including videos. Let me know if anything works
https://www.google.com/search?safe=off&client=piriform&sxsrf=ALeKk01MDFw7ngXj2DN8iJTar-TcXSe1IQ%3A1589388263832&ei=5yO8Xo-ZMoG6tQa7_7eIAw&q=Cannon+iP4840+Printhead+error
