User Activity

I have a PIXMA MP640. Does the "Canon PIXMA Printer Scanner Without Ink Cartridges" apply to my machine (link below)? I don't find a list. How does one tell if the cartridge is being used or not in scanning? I used the press and hold Stop button for ...
MP640 printer. Getting "Inner cover is open" error, but the inner cover is not open, and no matter how many times I lift the covers and close them firmly, the error continues. Suggestion on what to do?  Thanks,