Canon Community

Our office C3520i is printing but with two circular black smudges in roughly the same positions at the top of every page. I think I have successfully attached an image to the post.Could someone help me remedy this please?

I have a Canon Pixma ip90 and am looking for a battery for it. I've found a CK-51 for sale but am not sure if it is compatible...I fairly sure it is though. Am I right that the only difference between CK-51 and CK-51B is the colour (black)? Can anyon...