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Check input paper feeder at top too - easy to miss. Top flips open with a firm (but not excessive) pull, so you can look there.
If you are sure you've opened and looked under every available panel on the printer (there are many!), turn it off and unplug for half a minute. Make sure all panels are back properly in place, but leave out the paper tray (and no paper either in the rear input paper feeder).
Plug in and turn on. Wait for it to finish its start-up sequence - it should complain about no paper.
Check the paper is flat and straight in the paper tray, and no excess room between paper and guides, and put it in again.
HP LaserJet 3050z, 3050 All-in-one, 3052, 3055, 3390 and 3392 versatile printer - Error reported: Document Feeder Jam
How to correct the HP LaserJet 3050z, 3050 All-In-One, 3052, 3055, 3390 and 3392 versatile printer if this error is reported: Document Feeder Jam
Clear the jammed media from ADF (HP LaserJet 3050, 3050z).
Open the ADF cover plate.
Remove any jammed media with care.Take out the page gently.
Take care not to tear the paper.
Close the ADF cover plate.
Clear the jammed media from ADF (HP LaserJet 3390, 3392, 3052 and 3055).
Open the ADF cover plate.
Check whether all packaging straps inside the ADF are removed.
Unload the jam clearance component.Lift the two handles with both hands until the component clutch is released.Rotate and lift the jam clearance component, and then put it aside.
Lift the green handle, and rotate the paper picker until it is opened.
Gently remove the page without tearing it.If you feel resistance, go to the next step.
Open the ADF cover plate, and loosen the media gently with both hands.
When the media are stopped, pull the media out gently along the shown direction.
Close the cover plate of the flat scanner (HP LaserJet 3390, 3392, 3052, 3055).
Pull down the green handle.
Insert the jam clearance component to reinstall it.Press the two reeds until the component is properly engaged.Install the clearance component correctly. Otherwise, paper jams will continue to occur.
Based on the assumption it's mechanically ok, check the cable connection between the document feeder and the base, if damaged or worked look it can cause errors. If it is a sensor error, check for a small bit of paper or even a staple from a prior jam.