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HP ScanJet 7800 User Guide - Page 21

Clean the feed-roller assembly manually

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4. Follow the basic scanning steps. For more information, see Basic scanning steps. Caution Wait two minutes for the components to dry before proceeding to the next step. 5. Place up to five pages of printed paper in the scanner. Scan and view the results. 6. If streaks still appear, repeat steps 3 through 5. The cleaning cloth can be cycled through the scanner up to five times within 30 minutes. After that, the cloth will dry out. Clean the feed-roller assembly manually If scanned images have streaks or scratches, clean the feed-roller assembly. Follow these steps: 1. Open the scanner hatch. 2. Squeeze the tabs on the feed-roller assembly cover towards each other, and then lower the feed-roller assembly cover. 3. Use an HP paper-path cleaning cloth to clean the feed roller and the small rubber pad that is located below it. User Guide 19

Section	Page
Contents	3
HP Scanjet 7800 Scanner User Guide	4
What you can do with the scanner	4
Scanner hardware	5
Scanner front panel buttons	5
Power rocker switch	6
Scanning software	6
HP Smart Document Scan Software	7
Button Settings Utility	7
Other software programs	8
Where to get additional information	8
Printable version of this guide	8
HP Scanjet 7800 Setup and Support Guide	8
Online help	8
Accessibility	9
Screen-readable user guide in other languages	9
LCD Reader	9
Button Disable Utility	9
Set up profiles	11
Set up a profile with HP Smart Document Scan Software	11
Assign profile numbers with the Button Settings Utility	12
Modify a profile with HP Smart Document Scan Software	12
Import and export profiles	12
Scan and copy	14
Basic scanning steps	14
Basic copying steps	14
Scan two-sided originals	14
Scan a card in the card slot	15
Load originals	15
Choose acceptable paper	15
Load originals in the document feeder	16
Use the scanner buttons	17
Scan Document To button	17
Copy button	17
Button Settings button	18
Cancel button	18
Scan from HP Smart Document Scan Software	18
Scan from other software programs	18
Care and maintenance	19
Button Settings Utility General info tab	19
Order maintenance and scanning supplies	19
Clean the scanner glass	19
Use the HP paper-path cleaning cloth	20
Clean the feed-roller assembly manually	21
Troubleshooting	23
Scanner initialization or hardware problems	23
Reset the scanner	23
Scanner has stopped working correctly	23
Check the cables	24
Scanner operation problems	24
Scanner will not turn on	25
Scanner lamp stays on	25
Scanner does not scan right away	25
Scanned image is fuzzy	25
Scanner is scanning items very slowly	25
The scan is completely black or completely white	25
Scanned images are not straight	26
Vertical white stripes appear on the printed page	26
Scanner buttons are not working correctly	26
Buttons do not work	26
An unexpected program opens when a button is pressed	26
Wrong HP Smart Document Scan Software profile is used when a button is pressed	26
Scanner paper path problems	27
Paper jamming, skewing, misfeeds, or multiple-page feeds	27
Paper does not feed from the scanner	27
The bottom of the scanned image is cut off	28
The scanned images have streaks or scratches	28
An item loaded in the scanner jams repeatedly	28
Clear jams from the scanner paper path	28
Replace the feed-roller assembly	29