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I have a very nasty problem with my canon ipf 6300 printer.When I print a uniform colour a horizontal lighter/darker pattern occurs. The first 5 mm are the same colour and then the next following 5 mm are printed darker. This fault remains in every p...

I have a very nasty problem with my canon ipf 6300 printer.When I print a uniform colour a horizontal lighter/darker pattern occurs. The first 5 mm are the same colour and then the next following 5 mm are printed darker.Can you give me some advice to...