This article will outline the process to reset your canon printer with the world's easiest solution. Canon printers are so easy to work with, and this is because they have a feature called "Printhead Self-Test". This test prints out every nozzle on the print head before it leaves the factory, which gives you an idea of what condition your machine is in. If any nozzles are clogged or defective, then that part of the pattern won't show up on your paper. To fix these problems, all you need to do is use one of three different methods; Air Drying Method (ADM), Wet Drying Method (WDM) or Wait for Next Print Head Cycle (WNP). download canon printer service tool.