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You need a document feeder. The printer has on or it doesn't. If it does you usually place the documents face up in the overhead feeder and the scan sensor in the printer will detect a load of paper in the feeder and choose to there instead of a single sheet under the glass.
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.
Error E2.5 refers to the asf (assemply sheet feeder) in otherwords its the feeder that pulls in the paper that is malfunctioning. The whole machine needs to be stripped before you can even think about the problem. For a trained canon engineer (Me) it takes 1 to 2 hours to strip and usually the sheet feeder needs to be replaced. Probably with the costs involved it just is not worth it. Take a tip from me, Buy a new machine!! but before you do just make sure nothing has fallen into the machine and caused it to jam..
Hi, I understand your frustration. Try this solution.
* Push down the purple paper lever located on
the right side of the multi-purpose sheet feeder and pull the jammed
paper upward and out of the feeder. * Open the scanner cover by pulling the lever
located below the control panel, toward you and lifting the cover. Make
sure the cover is completely open. Check to see if any paper is left in
the paper path. *Close the scanner cover. * Remove the paper in the multi-purpose sheet
feeder. Adjust the guides in the sheet feeder to the position for the
paper size you are using. Fan the paper well, push down the paper lever.
Load the paper with the lever down. Make sure the print side is
toward the fax machine and the paper level is stacked below the paper
mark. The feeder can hold up to 200 sheets of paper (20lb paper) or up
to 10 envelopes. * Turn the power back on.
SOLUTION(S): Reset the Sheet Feeder Gears If the power fails while the paper is feeding or during a print job, the paper feed gears will lose their proper alignment. The reason is that after the power is restored the paper feed gears will attempt to return to the home position, which may not be possible if the paper stop cam is not in the correct position. PROCEDURES 1. Remove the sheet feeder from the unit. 2. Remove the sheet feeder motor from the sheet feeder assembly. 3. Remove the drive gear from its spindle. 4. Realign the lifting tray gear and paper stop cam gear. 5. Reinstall the drive gear and sheet feeder motor. 6. Reattach the sheet feeder to the print unit. 7. Reassemble the unit.
have you tried cleaning the separator pad inside the automatic document feeder?
try to Load one or two sheets of unused plain white full-size paper into the document feeder tray, and then press Start Copy Black to pull the pages through the automatic document feeder. The plain paper releases and absorbs residue from the rollers and separator pad.
If the problem persists, clean the rollers and separator pad manually