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Thank you all for your replies, and to Łukasz for the private message directing me to one more possible solution. Unfortunately, it does indeed appear that the logic board on my MP620 is damaged. If anyone is interested in acquiring it (for parts, experimentation or otherwise), please let me...

@The Hat, I followed your instructions. The old print head gave a B200 error. I turned off the printer, waited at least five minutes and installed the new print head. It also immediately gave the dreaded B200. :-(

Well, I hope to. Fair warning, though: What I don't know is a LOT more than what I do. :-)

I chose that title on purpose, because my MP620 started by giving me a B200 error, but now it's started to do something else—it turns itself off when I try to run the Canon Service Tool v3400 (which I learned about in another thread on this forum). More info: I'm able to get the printer's...

Hi, everyone. I've been messing with various inkjet printers for the last couple of years—mostly unsuccessfully. So I'm glad I finally found this forum, which seems to be populated mainly by people who actually know what they're talking about. I'm hoping I can pick up some knowledge and, in...