The printer does not have a tray 3. I noticed the main paper tray does not spring up when loaded with paper. Thanks
Go to your printer settings on the PC control panel (or equivalent subject to OS) and find printer properties, then find device settings. Check that Tray three (and others) are "not available" and or "not installed" preferably both.
The paper tray does not spring up until the tray is loaded into the machine.
SOURCE: HP 3015 Laserjet paper jam error message
The paper is probably jammed between the fuser and the rear cover if you can't see it.
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: HP Officejet Pro 8500 printer message "Paper jam"
An error code showing that there is paper jam alert, but no paper is in anywhere in the machine except in the tray.....I have checked all areas, taken the back carriage of the unit, opened the top and opened the machine. removed the paper tray, everything, but there is no paper stuck in the unit
SOURCE: paper jam inside HP Color Laserjet CM1312 MFP, not
paper jam inside HP Color Laserjet CM1312 MFP, not related to paper tray and is deep inside where it cannot be pulled out
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