Look into the maintenance kits. This YT site has some great videos regarding and their store seems to be about the same price as what I paid for the maintenance kit on eBay plus there are some other items worth knowing about like the fuser sleeve instead of the whole fuser assembly. https://www.youtube.com/watch?v=o9iWn5I6...
You might need a maintenance kit and have to remove some iron filings from the clutch that holds on the roller that keeps the bottom sheets of paper from feeding in with the sheet used for printing.
You might be able to do like I did with the clutch on the roller that is in the cassette (tray). Here is how to perform the clutch method: https://www.youtube.com/watch?v=fNW9TGrK...
Here is my iFixit page regarding my issues that sound the same as yours: HP Laserjet 4100TN TRAY 1 LOAD [TYPE][SIZE] error LOAD TRAY 1 LETTER
Here is the Device Page I started regarding (Note the 4000, 4100 and 4500 are similar in design and components): HP LaserJet 4100
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