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My Canon Pixma blinked E3 for days being non-usable. But I tried it and it worked. I cut the back cover off a high end home design magazine. I turned the printer off. Then on... as it rebooted I force stuck the magazine cover into the paper feed. First time nothing changed. I did it again and the printer booted up with a 1 instead of a blinking E3. Thanks By Owner
Maybe there are sensors or switches that had to be reset near the paper rollers. Who knows. And the problem started after changing the black ink cartridge.