Epson EL 486UC - Manual (Page 68)

Replacing the Option Card Connector Board
If you removed the option card connector board, follow these
steps to replace it. Refer to the option card connector board
illustration above.
1. Position the board above its slot and push it straight into the
connector, as shown below.
2. Secure the board to the back of the computer with its two
retaining screws.
3. Re-install any option cards you removed. See page 4-14.
4-20 Installing and Removing Options