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I have the same problem and was told by the telephone helpdesk that the machine cannot copy double-sided to double-side. The duplexing referred to is copying 2 single-sided documents onto one single sheet on both sides....Like whoever does that! This is misleading on Xerox's part . Colin B.
Sometimes using technical jargon makes it harder for people to understand each other (this applies to both askers and answerers).
I always advise askers to use normal language as much as possible and answerers to do the same and where jargon is unavoidable, to explain as they go along.
Please post again to clarify what you mean by "..a duplex to pdf..", in normal language not in technical jargon.
A PDF is not a real, physical document. It is a digital document on a computer or a webpage created in PDF format.
A Duplex document is a real document, printed on both sides of each sheet of paper.
If you are trying to scan a multiple page Duplex Document using the Sheet Feeder of your scanner, the ink on the reverse side may be getting caught up in, affecting and/or staining one of the rollers in the Sheet Feeder.
The bottom roller in most non-industrial Scanner Sheet Feeders expects to touch only the plain reverse side of a sheet of paper as it is passed through and turned over to rest on the Platten (scanning surface) of the scanner ready to be scanned.
Multifunction printers with built in scanners and sheet feeders and duplex printing capability are designed in a way that makes them more forgiving of dealing with duplex printed paper.
Duplex printing printed in a laser printer is less likely to cause a problem as long as it is allowed to dry thoroughly. Inkjet printing that is allowed to drry thoroughly should also be okay.
If the scanning is being attempted very soon after printing, then the wetness of the printing may be the problem.
Sheet Feeders that handle duplex printed sheets invariably become stained and need periodic cleaning.
If the document is not too long, you may have to scan it manually, page-by-page.
If the document exists as a PDF somewhere on your computer or on the internet, then it is unclear why you would need to scan it. This is why your question is puzzling.
Post a further comment, if this answer does not help you solve the problem.
Check your scanner software settings. It is probably set at duplex ever time you start to scan. That is why you get two pages for every pass, the front and the back. You must place the document in the feeder in a way that the front side of the document is page 2. You may want to flip it next time you scan. So the main question is why there is black line from top to bottom? That is because there is a piece of dirt stuck on the glass of the scanner. You see, this scanner actually does two scanning when a page runs through it: the front and the back in duplex mode. So there are two scanners in side the box. The front page scanner apparently is dirty and needs to be cleaned with clean cloth and lens cleaner.
I changed the settings from duplex (double sided) scanning to simplex (single sided) scanning under the settings tab in the scansnap organiser. this was ok since i had all one-sided documents to scan. you would need to reverse this settings change anytime you have a double-sided document to scan.
I havent used WYNN wizard. I use Capture perfect ver 2.0 it is available free of cost. Try with it. If it is okay, then may be some setting is missing. If it remains same, then there be some hardware issue in the scanner.
Try scanning a double sided document in duplex mode. Reverse the page and scan again. Make sure contrast/rightness settings are okay. If one side output is still not okay, then it possible that the lighting has failed. Either loose contact or failure of the lamp. Some scanners have LEDs and some have a lamp.