1. The cardboard is located inside the printer, so it is necessary to remove the shell at the bottom of the printer. You can unscrew the screws on the shell with a screwdriver.

2. After removing the shell, you can see the position of the cardboard. Take out the original cardboard and put the new cardboard into the printer to ensure that it is firmly installed and will not loosen.

3. Reinstall the printer housing and tighten the screws with a screwdriver.

4. Close the upper cover of the printer, reinsert the printer belt, turn on the power supply of the printer, and conduct test printing.

Printer is one of the output devices of computer, which is used to print the computer processing results on related media.