HP ScanJet Pro 4500 User Guide - Page 57
Touch screen display issues
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3. Restart the computer. 4. If the problem still persists, there may be a problem with the touch panel. Contact HP Support at www.hp.com/support. Touch screen display issues The touch panel is having display issues or scanner buttons are not working as expected The following symptoms indicate a problem with the scanner front panel. ● Touch panel issues: The display is blank, or part of the display content is missing. ● Button issues: Buttons are unresponsive, or the wrong action occurs when you press a button (for example, you get a single-sided scan when you press the Scan Duplex button. If the scanner exhibits any of these problems, contact HP support at www.hp.com/support. Scanning performance issues Scanner does not scan immediately Make sure the document feeder hatch is closed, and that the scanner is turned on. Scanner is scanning items very slowly When scanning to edit text, the optical character recognition (OCR) causes the scanner to scan more slowly, which is normal. Wait for the item to scan. NOTE: Windows: For the best OCR results, scanner compression should be set to the minimum compression level or be disabled. Scanning at a higher resolution than necessary increases scanning time and creates a larger file with no additional benefit. If you are scanning at a high resolution, set the resolution to a lower level to increase scanning speed. Scanner scans only one side of a two-sided page Verify that the selected scan shortcut specifies two-sided scanning. Scanned pages are missing at the scan destination When scanning, pages that stick together are scanned as one item. Check to confirm that scanned pages are not stuck together. Scanned pages are out of order at the scan destination ● Verify that the page order of the original document is correct before placing the document face up into the document feeder. ● Make sure that there are no staples, paper clips, or any other attached material (such as adhesive notes) that may cause the pages to feed incorrectly. ● Verify that pages are not stuck together. ENWW Scanner operation problems 49