HP LaserJet Enterprise M552 - Step 9: ITB cleaning; Step 10: Drum cleaning

Step 9: ITB cleaning
The cleaning blade scrapes the residual toner o the surface of the ITB. The residual toner feed screw
deposits residual toner in the toner collection unit. The residual toner which cannot be removed by the
cleaning blade is charged by the ITB cleaning brush, and then transferred from the ITB surface to the
photosensitive drum by the primary transfer (T1) roller.
Figure 1-22 ITB cleaning
Step 10: Drum cleaning
The cleaning blade scrapes the residual toner o the surface of the photosensitive drum, and toner is
deposited in the toner collection portion of the cartridge.
Figure 1-23 Drum cleaning
Cleaning blade
Residual toner
Photosensitive
drum
ENWW Engine laser/scanner system 39