Easiest way to find stubborn ADF defects is to scan a page, then take the printed copy with the defect and line it up on the ADF glass and it will point directly to the problem. And yes, if this is a single black line then dirt is the most likely cause and even clear adhesive from post it notes will cause light reflection that results in lines. ![]() I used to recommend Alcohol as well, but I have since read that alcohol will actually contribute to scratching of the glass, so I usually recommend something designed for glass. You should just need water or alcohol and a lint-free cloth. My advice - clean autofeeders glass - I have marked it on below photo.This is my advice, too. It's because when document is passed through scanner's glass this particular "dot" is read by scanner as line. If the problem only appears when using document feeder, then most probably documents feeder's glass is dirty.Įven small dust can appear as vertical line on scanned document.
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