HP Enterprise CP5525 manual 29Color-misregistration control

Color-misregistration control

The color-misregistration control corrects the misaligned color planes caused by the variation inherent in the laser scanner units or cartridges. The color-misregistration control corrects the following:

●Horizontal scanning start position

●Horizontal scanning magnification

●Vertical scanning start position

The DC controller forms a pattern of toner on the surface of the ITB, and measures a misaligned length with the registration density sensor and the registration density belt-perimeter sensor. Accordingly, the formatter calibrates the color-misregistration.

Figure 1-29Color-misregistration control

Regisration density sensor ITB

Registration density belt-perimeter sensor

Pattern of toner

The DC controller commands the formatter to perform the color-misregistration control whenever one of the following occurs:

●The product is turned on or the door is closed, after replacing any one of the cartridges

●The product is turned on or the door is closed, after replacing the ITB unit or the laser scanner unit

●A specified number of pages have been printed

●Continuous printing for a specified period of time

●Cold starting of the fuser when the product is turned on

If data from the registration density or registration density belt-perimeter sensor is out of a specified range during the cartridge-presence detection or when starting the color-misregistration control, the DC controller determines an abnormal sensor and notifies the formatter.

42 Chapter 1 Theory of operation ENWW