Question about Sharp AR-407 Copier

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What is this mean

Hi sir
i wana ask u what is the White correction mean
thx for ur answer

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In the scanner unit of the copier there is a white strip that is usually located under the main glass(depending on copy model). The copier shines light (from the bulb on the scan carriage) onto this white strip and reads/measures the reflection coming back from it. The copier knows that this strip should be white (which would be specific value stored in the copier) so to maintain copy quality the copier keeps referencing this strip to make sure it keeps the "white" value and does not loose sight of what white is supposed to be. If the strip becomes dirty/faded/scratched or missing a piece then you will notice a drop in copy quality.
If you were to stick a small black piece of tape onto the white strip the copier will still think that the black tape is supposed to be white but its value in reading the black tape will be completely different to the value it receives from the rest of the white strip. If you now made a blank copy you would get a black line showing up corresponding to the place where you stuck the black tape. BUT the copier still thinks its all white.
May sound a little confusing? but that's the just of it.

Posted on Mar 27, 2009

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Posted on Jan 02, 2017

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