Epson Y465ss127mo - Manual (Page 193)

2. Carefully insert the pins on the optional interface board into the
mating connector on the main board; then secure the board with
three of the screws provided.
3. Attach the plug end of the FG wire onto the FG pin located on top of
the interface board.
4. Reattach the upper case as described in the section immediately
following the next section.
7-40
Using Printer Options