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The cameras must be periodically calibrated in order to avoid undesired geometrical
distortions in the final copy, as well as ensure a correct color capture. Calibration can
be performed using the scanner maintenance tool provided with the system. It is
advisable to run the scanner calibration every time the system warns the user to do so,
or when any of the following defects appear: jagged lines, blurry images, modified
colors (with respect to previous copies).
3.1.2.4 Electronics
After each strip has been digitized, the electronics compose the whole image and apply
several image treatments and linearizations to correct geometrical and color space
distortions. The result is a digital image ready to be sent to the Touch Screen, which in
turn will either store the image or send it to the printer.
During the scanner maintenance process, the electronics calibrate all the responses from
other elements (light, optics and CCDs) and between the CCDs themselves to obtain an
accurate response. From time to time, the electronics performs a check to correct small
deviations, using the white background when no image is in the media path.
The scanner maintenance should be run whenever you suspect that copies are loosing
image quality due to the scanner maladjustment or periodically (e.g. once a month),
depending on:
• number of hours of usage,
• types of original loaded (some originals dirt the glass plate more than others),
• variations of temperature and humidity.
Color Reproduction for the HP Large Format Color Copiers family: cc800ps, 815mfp, 5500mfp and 4200 scanner
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