If everything checks out okay, the next copy to be run is a solid black page. If you are using a copier, this can be accomplished by opening the copyboard cover and running a copy. Because there is no paper in the copyboard, a solid black page will print. If you are using a laser printer, you will have to prepare a graphic page to be printed. Check the solid black page for even print throughout.
Light spots indicate a problem.
The different types of problems will be discussed in later reports. Next run a solid white sheet. Examine it closely for marks of any kind. Any flaws in the drum, charge roller, or magnetic roller will show up here. Be careful not to touch the drum through the shutter door when cleaning it, expecially if the drum was recoated.