When is about to print it write error code of "E000020-04b0 ' and tells me to consult. the name of my canon photocopy is irc3200n thank you

Hello Ben,
That code means the black drum unit has run as long as it can and MUST be replaced. There is no counter that can be reset that will help, as this code means that because of the age of the black drum, when the copier goes to verify that it can calibrate itself to meet the targets it knows it must meet...........for black it cannot. You have to replace the black drum cartridge. Fortunately this is an extremely simple process. By merely removing the old drum you will be able to install the new one. Just open the front cover,lower/release the large blue handle located at the center, then turn the handle in font of it to open the drum area. The black drum is located directly below the black tone assembly that you have always replaced. Just pull the black dum unit out. The new drum unit will have a protective cover on it's bottom. This cover serves 2 functions, to protect the drum and to help "locate" the proper loading point and angle. I bet you will have no problem putting in the new drum without the protective bottom cover , Just insert the drum the way the old one came out. Be mindful that it shuold be inserted straight, not angled in any way. The copier will "see " the new drum and take care of itself. I hope this helps "FIXYA". Have a Happy New Year!!!