HP N8400 manual Scanner operation problems, Scanner has stopped working correctly

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Chapter 5

Scanner has stopped working correctly

If the scanner stops scanning, follow these steps. After each step, start a scan to see if the scanner is working. If the problem persists, proceed with the next step.

1.A cable might be loose. Ensure that both the USB cable and power supply are properly connected.

Use the cable that was included with the scanner. Another USB cable might not be compatible with the scanner.

2.Turn off the scanner, wait 60 seconds, and then turn the scanner back on.

3.Restart your computer.

4.Use the Add/Remove tool (in Windows Vista, the Programs and Features tool) from the Control Panel to uninstall the following programs:

•HP Scanjet N8400 series Document ISIS/TWAIN

•HP Scanjet N8400 series Utilities

5.Reinstall using the HP Scanning Software CD that came with your scanner. When you insert the CD, an installation dialog box launches automatically.

Scanner operation problems

•Scanner will not turn on

•Scanner lamp stays on

•Scanner does not scan right away

•Scanner scans only one side of a double-sided page

•Scanned image is fuzzy

•Scanned pages are out of order at the scan destination

•Scanner is scanning items very slowly

•The image is completely black or completely white

•Scanned images are not straight

•Vertical white stripes appear on the printed page

•Scanner glass is dirty

•Scan files are too large

Scanner will not turn on

If the scanner will not turn on when you press the front panel scanner buttons, verify the following:

•The scanner power switch might be turned off. Be sure the power switch located on the back of the scanner is turned ON.

•The scanner may have been unplugged. Check to see that the power cable has not become disconnected from the scanner or unplugged from the power source.

•Check to see that the automatic document feeder (ADF) cable has not become disconnected from the scanner.

•The buttons might be disabled in the HP scanning software. Verify the Disable front panel buttons setting in the HP Scanner Tools Utility.

28 Troubleshooting

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Contents HP Scanjet N8400 series Copyright and license Trademark creditsContents Troubleshooting Advanced technical featuresScanner overview What you can do with the scannerScanner front panel buttons Power Save buttonScanner hardware Quick start buttonsCopy buttons Scan Document To buttonsScanner lamp setting Scanner softwareHP Smart Document Scan Software HP Document Copy Utility HP Scanner Tools UtilityScan Progress Window User Guide Where to get additional informationSetup and Support Guide Click View or print guidesControl of the scanner buttons AccessibilityLCD Reader HP Scanner Tools Utility helpScan and Copy Basic scanning stepsBasic copying steps Load originals Place an original on the scanner glassLoad paper into the document feeder Scan from the scanner front panel buttons Scan from HP Smart Document Scan SoftwareScan from other software programs Scan with one button pressSet up scan profiles Set up an HP Smart Document Scan Software profileAssign profiles to quick start buttons Choose profiles for display on the scanner front panelClick Continue Import and export profiles Order maintenance and scanning supplies Care and maintenanceHP Scanner Tools Utility Maintenance tab Clean the scanner glassClean the paper path Maintain the automatic document feeder ADFClean the ADF window Clean the feed roller Maintain the automatic document feeder ADF Chapter Remove the automatic document feeder from the scanner Replace the feed roller and separation padChapter Troubleshooting Scanner error messagesChapter Scanner initialization or hardware problems Scanner does not startScanner operation problems Scanner has stopped working correctlyScanner will not turn on Scanner scans only one side of a double-sided Scanner lamp stays onScanner does not scan right away Scanned image is fuzzyScanner glass is dirty Scanned images are not straightVertical white stripes appear on the printed Scan files are too largeScanner buttons are not working correctly An unexpected program opens when a button is pressedWrong profile is used when a quick start button is pressed Buttons do not workPaper does not feed from the ADF Automatic document feeder ADF problemsPaper jamming, skewing, misfeeds, or multiple-page feeds Bottom of the scanned image is cut offClear jams from the ADF Scanned images have streaks or scratchesAn item loaded in the ADF jams repeatedly Clear a jam from the start of the paper pathChapter Clear a jam at the end of the paper path Contact HP Support Remove a paper jam within the ADFAdvanced technical features Long pagesPage Index ADF