Epson 3865X Plus - Manual (Page 224)

8. Still holding up the subassembly, reach further back
underneath it and disconnect the two power supply cables
from the back right side of the main system board, as shown
below. Pull each of the connectors straight up. Do not pull
only on the cables.
Power
supply
cables
9. Lift the entire subassembly out of the computer and
carefully place it on your work surface.
If you are installing a drive, follow the instructions under
“Installing a Disk Drive in the Horizontal Position,” on
page B-34.
If you need to remove a drive, see “Removing a Disk Drive
From the Horizontal Position,” on page B-44.
Installing and Removing Disk Drives B-33