I have a canon PIXMA MG 5550 - about three years old. A few months ago the prints started becomming fuzzy especially text started to print double. I have tried cleaning, deep cleaning, roller cleaning, bottom cleaning many times with no luck. I have replaced all the catridges and still no joy. I am using original canon catridges. I have also tried head alignment At present the PGBK section will not print at all when I print a nozzle check pattern. Would be extremely grateful for solution/advice/fix.