2. Indirect calibration. The DC controller monitors the rotational speed of each feed roller
and controls the speed to prevent color misregistration.
Figure 5-30. Color registration calibration illustrates this process.
Figure 5-30.
Color registration calibration
Drum phase calibration
The drum phase calibration aligns all four cartridge motors and their drive gears.
Image stabilization control
As the print cartridge ages, the toner and the photosensitive drum begin to deteriorate,
which can cause fluctuations in image density. The printer accounts for this with image
stabilization control. There are two kinds of image stabilization control:
● image density calibration control
● image halftone calibration control
Each control operates as necessary.
Environmental change control (HP Color LaserJet 5550 models)
This control calibrates each bias to obtain the best image possible according to
environmental changes.
The environment conditions sensor detects the temperature and the humidity. The sensor
sends this information to the DC controller in the form of the Temperature Detection signal
(TEMSNS) and the Humidity Detection signal (HUMSNS).
166 Chapter 5 Theory of operation ENWW
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