Kyocera Mita FS-1900N Operation Manual page 175

2
Remove the two screws from the printer's rear panel.
3
Pull the main circuit board all the way out of the printer.
DIMM Socket
Before pulling the main circuit board out, clear away the area, behind the
printer. Foreign objects, accidentally sticking to the back of the main
circuit board, can cause serious damage to the printer.
Note
Install the DIMM as described on the following page.
B-5
Expanding the Printer Memory
Screws