Image stabilization control
NOTE: The product contains a thermal sensor, located within the TCU level detection sensor, which
monitors the temperature in the cartridge area and uses this information to make adjustments during CPR
control.
Environmental changes or deterioration of the photosensitive drums and toner can cause variations in the
image density. The image-stabilization control reduces these fluctuations.
Table 1-15 Image-stabilization controls
Image density control (DMAX) This control corrects variations in image density related to deterioration of the
photosensitive drum or the toner. The DC controller adjusts the high-voltage biases to
correct the problem under the following conditions:
The image-stabilization control calibrates each high-voltage bias to stabilize the
fluctuations in image density caused by deterioration of the photosensitive drums or
toner or because of environmental changes. The DC controller determines the product's
environment based on the surrounding temperature and humidity data from the
environment sensor. The DC controller calibrates the biases according to the detected
environment and usage condition of the toner cartridge to obtain an appropriate image.
The DC controller determines an environment sensor failure and notifies the formatter
when it detects environmental data from the environment sensor with out of specified
value. The DC controller commands the formatter to control the image density under the
following conditions
●
The temperature of the main thermistor is too low when the product is turned on
●
A toner cartridge or the ITB is replaced
●
A specified number of pages have printed
●
After a specific period of the completion of a previous DMAX
●
The environment changes for a specified condition after a previous DMAX
Image halftone control (DHALF) The formatter performs this control to calibrate the halftone, based on the halftone-
density measurements, under the following conditions:
●
The formatter sends a command
●
DMAX is completed
The DC controller determines an RD sensor failure and notifies the formatter if it detects
data from the RD sensor out of a specified range.
The DC controller determines a RD sensor failure and notifies the formatter if it detects an out-of-specified-
data value from the RD sensor when the product is turned on or when the color misregistration control starts.
42 Chapter 1 Theory of operation ENWW
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