HP Enterprise CP5525 manual Environment change control, Image stabilization control

Environment change control

The environment change control calibrates each high-voltage bias to obtain an appropriate image according to the environment changes. The DC controller determines the environment, where the product is installed, based on the surrounding temperature and humidity data from the environment sensor. It adjusts the high-voltage biases to accommodate environmental changes.

The DC controller determines an environment sensor abnormality and notifies the formatter when it detects out of specified range data from the environment sensor.

Image stabilization control

The image stabilization control reduces the fluctuations in image density caused by environmental changes or deterioration of the photosensitive drums or toner. The two kinds of image stabilization controls are image density control (DMAX) and image halftone control (DHALF).

Image density control (DMAX)

The image density control calibrates each high-voltage bias to stabilize the image density variation caused by the deterioration of the photosensitive drum or toner. The DC controller commands the formatter to control the image density under the following conditions:

●The detected temperature of the fuser is a specified degree or lower when the product is turned on

●The product is turned on, or the door is closed, and also whenever a specified number of pages have been printed 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

●After a specified period of time from the previous image density control

●The environment is changed for a specified condition after the previous image density control

Image halftone control (DHALF)

The image halftone control is performed by the formatter to calibrate the halftone. The DC controller measures the halftone pattern according to a command from the formatter. Accordingly, the formatter calibrates the halftone. The DC controller controls the image halftone under the following conditions:

●The image density control is completed

●The formatter sends a command

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