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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.
A black line down a scanned page indicates a dirty scan glass. Lift the top of you scanner like you would putting a page or book down to scan. On the end of the scanner that has the document feeder you should see a thin piece of glass the is separate from the larger glass pane. This is the document feeder glass. Now check it over for a very small mark of ink or dirt. You can use regular glass cleaner to wipe this glass just spray it on a piece of cloth not the scanner then wipe. You may have to wipe and then try scanning several times if the ink or marker is died on. while you are cleaning you should also clean the main glass pane, it will make the scans clearer and crisper.
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Try scanning a bigger document. Use a blank page big as the scan capacity and scan the blank page.
If for example you are using an a3 scanner, scan a blank A3 page.
When scanning blank page set resolution to an high value, so that you does not lose pixels.
Check scan result, and explore the whole document using zoom to see if the line is still present on the test scan of the blank page.
If there is still the line, then it is either a scanner dirty, probably inside glass, or a dafective sensor on CCD sensor array.
If there is no line, then the problem is usually depending on the software.
In that case uninstall the software and install it again.
If that is not enough to fix the problem, try uninstalling software, doing a system restore to a date before the problem started , and then installing software again.
If the line is horizontal , that is usually a loss of power on the high voltage to lamp. Try reinstalling software first, if that does not fix the problem , and line is horizontal, then it is fault mentioned above. Horizontal lines at the end of a document may also be caused by faulty scanner control board, or scanner going out of memory.
I don't have the exact printer, but I was having the same problem with it. Here's what I did to solve it: 1. Before you start scanning open HP Scan Pro. 2. Click on new scan and it will give you a preview of what is to be scanned. 3. There should be a window you can adjust to scan only a certain area, click on the handles and pull them out to scan the entire page. 4. When you have surrounded desired area, click accept down at the bottom and it should scan the entire page.
Hope this helps!
(I should also probably mention I did this on my mac. It may be a little different for Microsoft users, but this should still work.
Possibly you need a more professional program. Scanning utilities following scanners (free) aren't a "Production" tool. Using PixEdit you can scan with one single click and after the scan is finished you could scan the next stack of pages. While it is then scanning the previosus document is processed with blank page removal, deskew, OCR, barcode recognition and a lot of other stuff. The reason is PixEdit using the mulitple cores in modern PCs.
This is practically impossible. This can happen only when the file is over written! Check your software settings. May be you have selected 'multipage' option. Try scanning one page and two pages (same sheet). If the file size is different, then it means two files are scanned.
Reload your Driver and check your scanning software. I am assuming you are usning winXP/Win 2000.