Image-stabilization 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 5-11 Image-stabilization controls
Environment change control The DC controller monitors environmental information from internal temperature and
humidity sensors. The DC controller adjusts the high-voltage bias to accommodate
environmental changes. This control occurs under the following circumstances:
●
The product is turned on.
●
The print cartridge is replaced.
●
A change in environmental conditions occurs.
The DC controller notifies the formatter when it encounters a communication error
with the environmental sensor.
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 sub thermistor detects a temperature that is too low when the product is
turned on.
●
A print cartridge is replaced.
●
A specified number of pages print after replacing the print cartridge.
●
A specified number of pages have printed.
●
The formatter sends a command
●
The product recovers from sleep mode
●
After a specific period of the completion of a print operation
●
The environment is relatively charged.
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 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.
ENWW Image-formation system 135
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