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I would start here by cleaning the feed rollers but there could be several causes to this. It could be the fuser film is slipping and not getting the paper out in time thus throwing a false paper jam message. It could be the fuser isn't turning at all and not allowing the paper to enter. Normally if the paper is making it out of the tray then it isn't the feed roller but that is always the cheapest place to start. You can clean the roller(s) with an alcohol wipe or rag with alcohol on it.
Does the paper make it past the toner cartridge? I have seen toner cartridges lock up and cause this type of problem as well. If the paper isn't making it past the toner I would try replacing the cartridge (even if its with an old one just to test the paper path).
if it always jams at the same place (fuser area) try another fuser or check the BLACK PLASTIC ASSY. THAT is mounted in the left door and takes the paper right after it comes out of the fuser ;part is called (PAPER DIVERTER) And sometimes one of the FLAPS That routes the paper is broken,hence causing paper jam.
I was able to fix my problem. On the left side of the fuser assembly there are two small plastic tabs or flags that move up & down. One is attached to the plastic rod/flap that you can see from the top of the fuser and moves when the paper comes out of the "chute". The other tab, which is below the first tab and moves when the paper has passed some point in the fuser, was broken off. I glued the tab back on and now the paper is ejected from the printer like it is suppose to.
I'm thinking that the broken tab was part of a page sensor flag that would tell the printer to stop rolling the fuser assembly when the paper was ejected. Without the flag, the sensor would disengage the fuser prematurely and stop ejecting the paper while the paper was still in the fuser.
If you replaced the fuser roller, check for a little sensor flag that is right there as the paper exits. You may have misaligned it. It's easy to move out of place. Also make sure that you didn't disconnect any of those little plastic connectors.
HP LaserJet 4, 4m, 4 Plus and 4m Plus Series Printers - False Error Message 13 PAPER JAM
After clearing all jammed paper from the HP LaserJet 4, 4m, 4 Plus, or 4m Plus series printer, the display still reads 13 Paper Jam . Even after cycling the power off and then back on, the error remains.
Open the rear door of the printer. There is a paper sensor near the upper right hand corner of the fusing assembly (just below the right edge of the long yellow warning sticker on the fuser) that can cause paper jam error messages even when there is no jammed paper in the printer. Toggle the thin black plastic lever up and down to make sure it is not stuck or sticky. The lever should be in the down position before closing the back of the printer. If the lever is stuck or missing, the printer will generate a false paper jam message.
Hope it will help you !