The assembly locates on top of the black toner cartridge port. Take the blue brush out and clean the assembly. The clean up procedure is intended for a HP Color LaserJet 5500 printer. If you have a different 3d printer, refer to its manual. If it’s not fuser, it may be the toner cartridge which is either defective or nearing the end. In that case also, you will need to replace it.
Paper jams are the commonest printer problems, not just with HP printers but with all the printer brands and models. Paper jam can occur due to a number of reasons from the torn paper bits, wrong paper tray selected, wrong paper type selected, loose paper roller, and to a lint of dust etc.
If it is different, printer will experience a paper jam problem. Make sure that the paper type matches what is in the printer properties. If not, correct it. Also, make sure that the printer prints to the right paper tray. Failure to which will lead to paper jam. If the roller seems to be loose, tighten it carefully.
It happens when Windows selects a default printer by itself. If you are using Windows 7, click the Start button and point to Devices and Printers. You will see various printers listed under Printer and Faxes. Right-click the desired printer and click Set as default printer. If prompted, confirm the action and exit Devices and Printers.
If you are using Window XP, click the Start button and point to Control Panel. Double-click Hardware and Sound and then Printers. Look for the printer that you want to set as default, right-click it and then choose Set as Default Printer.