HP N8400 manual Scanner lamp stays on, Scanner does not scan right away, Scanned image is fuzzy

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Scanner lamp stays on

The scanner lamp should time out and turn off automatically after a period of inactivity (about 15 minutes). This is the Power Save mode.

If the scanner lamp remains on after a long period of inactivity, turn off the scanner, wait 30 seconds, and then turn the scanner back on.

Scanner does not scan right away

Make sure the power switch on the back of the scanner is turned ON.

If the scanner has not been used for a while, the scanner lamp might need to go through a warm-up period before scanning can begin. If the scanner lamp needs to warm up, it takes a moment after starting the software or pressing a scanner button for scanning to begin.

You can enable Instant Lamp On mode in the HP Scanner Tools Utility.

Scanner scans only one side of a double-sided page

Select the Duplex setting in the scanning or copy software.

Scanned image is fuzzy

It is important that the item you scan comes in close contact with the scanner glass. If the resulting scanned image is not clear, check to see that the item is in full contact with the scanner glass.

Check for any obstructions in the scanner paper path and make sure the paper width guides are positioned appropriately. Try another scan.

Clean the scanner glass as described in the Care and maintenance section.

Scanned pages are out of order at the scan destination

Insert a multiple page document with the printed first page of the document facing up and with the top of the document into the feeder.

Scanner is scanning items very slowly

If you are scanning to edit text, the optical character recognition (OCR) software program causes the scanner to scan more slowly, which is normal. Wait for the item to scan.

The resolution might be set too high. Reset the resolution to a lower level. The scanner software automatically selects the resolution to provide the best balance between image quality and file size.

The image is completely black or completely white

The item might not be placed correctly on the scanner glass. Make sure that the item you are trying to scan is placed face down on the glass and the lid is closed. If scanning from the ADF, check the paper orientation.

Scanner operation problems

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Contents HP Scanjet N8400 series Trademark credits Copyright and licenseContents Advanced technical features TroubleshootingWhat you can do with the scanner Scanner overviewQuick start buttons Power Save buttonScanner hardware Scanner front panel buttonsScan Document To buttons Copy buttonsScanner software Scanner lamp settingHP Smart Document Scan Software HP Scanner Tools Utility HP Document Copy UtilityScan Progress Window Click View or print guides Where to get additional informationSetup and Support Guide User GuideHP Scanner Tools Utility help AccessibilityLCD Reader Control of the scanner buttonsBasic scanning steps Scan and CopyBasic copying steps Place an original on the scanner glass Load originalsLoad paper into the document feeder Scan from HP Smart Document Scan Software Scan from the scanner front panel buttonsScan with one button press Scan from other software programsSet up an HP Smart Document Scan Software profile Set up scan profilesChoose profiles for display on the scanner front panel Assign profiles to quick start buttonsClick Continue Import and export profiles Clean the scanner glass Care and maintenanceHP Scanner Tools Utility Maintenance tab Order maintenance and scanning suppliesMaintain the automatic document feeder ADF Clean the paper pathClean the ADF window Clean the feed roller Maintain the automatic document feeder ADF Chapter Replace the feed roller and separation pad Remove the automatic document feeder from the scannerChapter Scanner error messages Troubleshooting Chapter Scanner does not start Scanner initialization or hardware problemsScanner has stopped working correctly Scanner operation problemsScanner will not turn on Scanned image is fuzzy Scanner lamp stays onScanner does not scan right away Scanner scans only one side of a double-sidedScan files are too large Scanned images are not straightVertical white stripes appear on the printed Scanner glass is dirtyButtons do not work An unexpected program opens when a button is pressedWrong profile is used when a quick start button is pressed Scanner buttons are not working correctlyBottom of the scanned image is cut off Automatic document feeder ADF problemsPaper jamming, skewing, misfeeds, or multiple-page feeds Paper does not feed from the ADFClear a jam from the start of the paper path Scanned images have streaks or scratchesAn item loaded in the ADF jams repeatedly Clear jams from the ADFChapter Clear a jam at the end of the paper path Remove a paper jam within the ADF Contact HP SupportLong pages Advanced technical featuresPage ADF Index