Epson EQUITY 3865X/20 PLUS - Manual (Page 110)

4. Raise the front of the subassembly to a slight angle.
Use one of your hands to hold up the subassembly at an
angle or have someone hold it up for you. With your other
hand, reach under the subassembly and disconnect the hard
disk drive cable attached to the front right side of the main
system board, as shown below. Grasp the cable by its plastic
connector and pull it straight up to remove it from the
socket. Do not pull on the cable.
5. The diskette drive cable is connected to the socket just
behind the hard disk drive socket. Disconnect this cable in
the same manner.
Accessing Internal Components 5-7