The underneath side of the scanner glass cannot be cleaned on any
product. This is unlikely to be necessary and should only be done by an
authorized service provider.
This note is found on that website. For an authorized service provider near you: http://hp.infonow.net/bin/findNow?CLIENT_ID=HP_LOC_CAN_SRV (in Canada) http://hp.infonow.net/bin/findNow?ONE=1&CLIENT_ID=HP_LOC_USA_SRV&PAGE=Search.html&LANGUAGE=USA_ENGLISH (in USA)
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The cause of this is dust! there are no switches to let it know it has reached the end it is only based on detection of the edge of that silver tape that's underneath, the detection is obviously done by... scanning! it is the contrast that triggers it
Clean the scanner glass from both sides,
the scanner module face
the silver strip
the white scanner cover/lid (this might be the main issue as the lid turns colour from white to yellow after a while) if the cover is yellowed try placing paper inside when turning it on if it persists try other colours or materials and experiment with it.
and if you still couldnt resolve it then you have probably changed your main board with a low quality one! Let me know about this last part!
Often, the problem is that the scanner mirror needs to be cleaned.
If you are comfortable, disassemble and clean the
scanner equipment. Sticks, glasses and mirrors, all should be accessible.
Some notes: - Clean everything with glass cleaner -
Check where the white stripe is on the bottom of the glass plate - Put a mark
on the plastic, where this stripe is located, so you know the location of the stripe on the
outside as well. - Enlarge this mark, so it is on the main body as well -
Remove the glass again - Align the scan head by hand, so that the bottom
mirror is exactly on line with your mark - Put everything back together -
Be careful, don't move the scan unit - Turn it on when it's complete
If still a problem, the unit needs to be serviced.
There is something stuck on the scanner glass. To test for this problem try making a copy by laying your original on the glass and making your copy, not running it through the feeder. If it copies fine from the glass it is definately something in the feeder/scanner glass. Just clean it with a soft cloth and some glass cleaner. You should be lookig for a thin strip of glass to the left of the large glass. Or you might have to open up the feeder unit and find it there.
If the glass of your scanner is too close to the scanner array it can jam. The cure for this problem is to open the case and put some narrow strips paper under the glass. If under Guarantee take it back. Doubt if you can bypass the self test.
I'm not sure about this specific model, but I've had similar problems with other HP all-in-ones and usually what fixes it is uninstalling and reinstalling the software (make sure to follow their directions properly and not plug the printer in until they tell you to). You should also make sure you're using the most updated software from the HP website rather than the one that came on the CD with the printer which may be outdated.