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Canon MB2155. Changed a couple of cartridges and got the dreaded b504 error.  Tried a couple of new cartidges - same error.  Tried printer reset. Is this the end? 
Ok, I know the printer works because I've got it working with wifi DIRECT to my pc but want it connected to my router.The printer (and pc) cannot see the router (distance/walls too long/thick) so I've got a TP-LINK powerline pair to extend the wifi. ...