Hello there this may work for you, it has worked for many here I given this advice so gave it a try it could work for you.
Generally when this happens, something has fallen into the printer, or a piece of paper has been jammed in there.
First step, remove the ink cartridge, and turn the printer upside down and gently shake it, see if anything comes out.
If nothing goes, or you can't hear anything rattling around, get a piece of cardstock paper (60lb or heavier) and gently push this through the printer, to see if it will help push out what might be stuck in there.
And gave the rode that the ink slides on a good clean and maybe a bit oil on cloth and wipe the rod with it.
Please come back and just gave a vote, it will gave me some satisfaction to know am helping some one so I will keep on helping.
All The Best: Pineworks
SOURCE: hi, i have a HP officejet J4680 all-in-one. The
Clean every moving part with suitable substance. It will be better that you get a support.
SOURCE: my hp officejet j4680 all in one printer keeps
There are a couple things in here that you'll want to try.
SOURCE: When I turn my printer on (HP J4680) it always
If you disconnect the printer from the computer and your printer stops trying to feed paper when you turn it back on, then this solution likely won't help you.
SOURCE: HP j4680 all in one printer constant Paper jam message
Based on encouragement from olsnake above, I fixed it easily. It definitely WAS the encoder wheel (a thin clear plastic disk printed
with timing marks) on the left side of the paper-feed roller, as you look at it from the front. This wheel provides motion feedback to the paper feed control software. If the disk is detached/loose, the device thinks the paper feed roller is stuck or impeded, and thus gives the annoying error.
What I did:
1) Remove the scanner assembly (it comes off with a few screws, and is a totally separate unit; The printer works with it completely disconnected (after it complains that the scanner is malfunctioning). Beware that you don't break off the little control panel. Or you can be safe and remove the one screw holding it on, by prying off the 'HP OfficeJet...One" plastic cover.
2) Once you have removed the scanner assembly:
at the left side you will see three white plastic gears meshed together; the farthest one is covered in a circular black
plastic cover. With some care you CAN remove this cover without any additional screwdriver work.
3) in my case (and most others I bet) the thin disk was detached from the gear to which it should be attached. I just shoved it back on, so it was tightly mated to its white gear. You should also ensure that the clear disk goes through the optical sensor at the bottom (mine was).
4) I did not bother to replace that cover, if you can do it, good for you.
5) Test, and reassemble.
This is about the WORST product engineering imaginable. But I have a working printer again!
SOURCE: My HP J4680 printer is saying it has a paper jam
Very often paper gets stuck in the rollers up in the machine that you cannot see, but is enough to block the paper sensor. Some HPs have a panel on the back so that you can get to the rollers another way. You may have to take the cover off, but there is a small piece jamming things up.
Testimonial: "Fantastic help, thank you so very much as I did not see the back panel!!!! Thank you again!!!!!"
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you must inspect it very close and also check in the back if theres a door,
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