HP LaserJet Enterprise M552 - ITB cleaning mechanism; Secondary transfer roller functions

ITB cleaning mechanism
The cleaning blade in the ITB cleaner scrapes the residual toner o the ITB surface and deposits the residual
toner into the toner collection unit. The residual toner feed screw deposits the residual toner to the residual
toner feed unit. The ITB motor and the residual toner feed motor drive the screw. The residual toner that
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. The DC controller detects whether
the toner collection unit is full by using the toner collection unit full sensor, and then noties the formatter.
Figure 1-28 ITB cleaning process
Secondary transfer roller functions
The secondary transfer roller transfers the image from the ITB onto the paper.
The printer has the following secondary transfer roller functions.
Table
1-17 Secondary transfer roller functions
Function Supported feature
Secondary transfer roller cleaning mechanism Yes
Secondary transfer roller presence detection No
Secondary transfer roller life detection No
Secondary transfer roller alienation control Yes
48 Chapter 1 Theory of operation ENWW