Turn off the printer.
Open door B.
Remove the front cover, and then close door B.
Unpack the keyboard shelf.
Insert the keyboard cable into the shelf.
Loop the cable inside the shelf.
Remove the adhesive cover.
Align, and then attach the keyboard to the base.
Align the shelf, connect the keyboard cable to the printer, insert the shelf, and then attach it to the printer.
Turn on the printer.