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Sannaer glass is dirty:
Cleaning the scanner glass and white reference strip
Follow the steps below to clean the scanner glass and reference strip:
Remove any loose paper debris that may be present.
Carefully clean the white reference strip on the underside of the scanner cover (or top cover) with a clean, lint-free cloth, moistened lightly with isopropyl alcohol. Clean only the white plastic part on the scanner cover.
For those models that have a scanner glass, clean the scanner glass with a lint-free cloth, moistened lightly with glass cleaner. The HP Officejet K series and HP fax 1220 have a scanner opening instead of a scanner glass. Make sure that no debris is in the scanner opening. Use canned air to gently blow dust and debris from the scanner slot.
Replace all removed components and close the unit.
Plug the power cord back in and turn the unit back on.
Make a copy to verify the lines are not present. If lines are still present and there is nothing visible on either the scanner glass or the reference strip, the unit will require service.
Since u have cleaned the flatbed and inside the cover,thats a nice move thou. Try the following steps that should resolve the issue,
1) unplug the power cord at the both ends from the printer and wall outlet. connect to wall out let directly dont connect to printer.
2)Press and hold # and 6 while reconnecting the power cord to the product hold for 1 min after plugging the power cord, and then release both buttons, this should resolve the issue.
If you lift up the lid on your scanning device you will notice a glass strip about 1 inch thick and then the large area of glass used for flatbed scanning. The 1 inch strip is used for ADF scanning. Because your papper is moving across the glass strip, any dot, smudge or scratch will affect your scanning and cause verticial lines down the page. Sometimes the dot is not visible to the eye. Get some glass cleaner that has alcohol in it and thoroughly clean the glass strip and it should solve your problem. If it turns out to be a scratch on the glass then cleaning won't help.