HP Scanjet N8420 User Manual

Maintain the automatic document feeder (ADF).......................................................................18
Clean the paper path..........................................................................................................18
Clean the ADF window.......................................................................................................19
Clean the feed roller...........................................................................................................20
Replace the feed roller and separation pad........................................................................23
Remove the automatic document feeder from the scanner......................................................23
5 Troubleshooting
Scanner error messages..........................................................................................................25
Scanner initialization or hardware problems.............................................................................27
Scanner does not start.......................................................................................................27
Scanner has stopped working correctly..............................................................................28
Scanner operation problems....................................................................................................28
Scanner will not turn on......................................................................................................28
Scanner lamp stays on.......................................................................................................29
Scanner does not scan right away.....................................................................................29
Scanner scans only one side of a double-sided page........................................................29
Scanned image is fuzzy......................................................................................................29
Scanned pages are out of order at the scan destination....................................................29
Scanner is scanning items very slowly...............................................................................29
The image is completely black or completely white............................................................29
Scanned images are not straight........................................................................................30
Vertical white stripes appear on the printed page..............................................................30
Scanner glass is dirty..........................................................................................................30
Scan files are too large.......................................................................................................30
Scanner buttons are not working correctly...............................................................................31
Buttons do not work............................................................................................................31
An unexpected program opens when a button is pressed.................................................31
Wrong profile is used when a quick start button is pressed...............................................31
Automatic document feeder (ADF) problems...........................................................................32
Paper jamming, skewing, misfeeds, or multiple-page feeds..............................................32
Paper does not feed from the ADF.....................................................................................32
The bottom of the scanned image is cut off........................................................................32
The scanned images have streaks or scratches................................................................33
An item loaded in the ADF jams repeatedly.......................................................................33
Clear jams from the ADF....................................................................................................33
Remove a paper jam within the ADF............................................................................36
Contact HP Support..................................................................................................................36
6 Advanced technical features
Long pages...............................................................................................................................37
Color dropout............................................................................................................................37
Misfeed (Multipick) Detection....................................................................................................37
Index..............................................................................................................................................39
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HP Scanjet N8420 Specifications

General

Brand	HP
Model	Scanjet N8420
Category	Scanner
Language	English