Question about HP Officejet Pro L7780 All-In-One InkJet Printer
The document feeder is not advancing paper from the document feeder; I have carefully taken it apart from the cartoons in the inside cover, but it is not laying back down straight so I have not got the problem fixed; the manual that came with the machine does not offer anything.
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Posted on Jan 02, 2017
It sounds to me like the switch that senses when paper is present is blocked or out of position.
The User Manual and such does not provide sufficient detail for me to decipher what type of switch is used. It is either going to be a switch that is depressed to close the circuit when paper is present and is held down somehow now, or it is a proximity sensor and there is dirt or whatever on the sensor that is enough to make it think there is paper there. It should be something that appears to be a tiny window, and it would need to be cleaned with a qtip or 100% cotton cloth and isopropyl alcohol.
You will likely need to remove the ADF feeder cover to obtain full access to the ADF mechanism and find the sensor, since it is most likely recessed in the ADF quite a ways.
The other possibility is that the wire for the sensor has been damaged after a jam or something of that nature.
If you have searched for the sensor and cannot locate it / clear the error, then you will need to have a service tech work on the machine.
Posted on Jun 20, 2008
open the ADF and clean the rollers and wooden cork pad and unplug the machine and press and hold the ON button for 1 min and release the button and plug it bak and it should resolve ur issue........
Posted on Jan 21, 2009
Take a little soap and a little water and clean the gray feed tire that is located in the document feeder. Check for any paper obstructions. If the machine has had a lot of prints I would replace the feed tire.
Posted on Jan 23, 2009
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