Imaging drum cleaning block In the primary transfer, not all of the toner on the imaging drum is transferred to the transfer drum, leaving some toner on the imaging drum surface. Also, additional toner is placed on the imaging drum surface when the transfer drum is cleaned. 11. Imaging drum cleaning To prepare for the next printing operation, the cleaner blade scrapes the residual toner off the imaging drum surface. The scraped toner particles are trapped with the sweeper strip and collected into the waste toner case. Figure 35. Imaging drum cleaning block 152 Chapter 5 - Theory of operation EN