Contents of the RS-422 This kit contains the following items: RS-422 Chip Jumper Tools Required The RS-422 Option only requires a #2 Philips screwdriver for installation. Preparing the Printer Turn the Printer off and unplug the power cord from the printer. Remove any data cables attached to the printer. Touch a metal part of your printer’s frame to ground yourself and discharge any static electricity. Remove the two Screws securing the Main Logic Board to the printer.