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Sounds like it needs to be recalibrated. I suggest first try reseating your ink cartridges. If that doesn't fix it, try looking in the manual or finding the manual online to get the steps necessary to recalibrate the machine. If that still doesn't cut it, I would contact technical support.
Sorry, there was a problem. Please try again later.Thank you for reaching out. Since the black line only appears on pages scanned on the glass, it's 99% likely that the page is not aligned per the arrow in the rear left corner of the glass. To make a large copy of a small original, scan the original into the computer, resize the image in the scanning software, and then print a copy of the enlarged image. If you want to adjust scan size, output type, scan resolution, file type, and so on, start scanning from the printer software. You can also edit scans using the software. If these cures do not solve the issue, please reach out to Support.HP.com or call 800-474-6836. Meanwhile, your printer's User Guide is here: http://h10032.www1.hp.com/ctg/Manual/c07773132.pdf
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