Epson Endeavor WG - Manual (Page 72)

Replacing the Option Card Connector Board
If you removed the option card connector board to access any
system components, follow these steps to replace it:
1. Position the board above its slot as shown below, and then
firmly push it straight in.
2. Secure the board to the power supply with its retaining screw.
Now you can re-install any option cards you removed. See
page 2-14 for instructions.
2-20 Installing and Removing Options