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.
●
Color misregistration by the environmental change is out of a specified length.
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.
Environment change control
The environment change control calibrates each high-voltage bias to obtain an appropriate image
according to the environmental 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, the door is closed, or 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.
42 Chapter 1 Theory of operation ENWW
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