Initially press the power button to cancel the ongoing print operation. Locate the Input tray and remove all A4 sheets and then access for the paper path cover. Try to pull the paper path cover up and then examine for any paper jam to remove it. Replace the paper path cover back to its original position.
Next, access the Output tray and find for paper jamming. Try to pull the A4 media away from your printer to entirely free from jamming. Now Touch OK button that appears on the display screen of your Control Panel to continue printing. Next step in clearing paper jam is, close the Output tray extender and then draw from the lateral sides of the Cartridge access door to open and rest it on your printer. Locate the print carriage and then try to slide the print head to one end of the carriage. Search for paper jams to remove it. Now again slide the print head to the other end of the carriage and then clear paper jams.
Move the Print head to the center of the print carriage and then go ahead and close the Cartridge access door to latch it. Next further step is, detach the Input tray and then turn the HP Printer and place it on one of its lateral side to access the cleanout door. Draw both of the tabs away from your printer to open the cleanout door. Check for any paper jam to remove it. Now push the cleanout door to close it. Restore HP Printer to its usual print setup position. Use the Output tray extender for your convenience. Load the Input tray with A4 sheets and then continue printing.