Tip :: Diagonal Printing??

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Found this on a Canon iP4200 I was replacing the printhead in and thought I'd share as it weirded me out a little until I realised what it was

http://www.continuousink.info/forum/gallery2.php?g2_itemId=424

Turns out there was some gunk had gotten on to the little plastic strips with lots of black striations on it, which, I'm reasonably certain the printer uses as a guide to printhead location, etc...

Cleaned that off and it worked a whole lot better