Epson 3865X Plus - Manual (Page 211)

4. Use one of your hands to hold up the subassembly or have
someone do it for you. With your other hand, grasp the
longer end of the hard disk drive ribbon cable that you
tucked underneath the drive when you installed it. Pull the
cable under the subassembly and toward the front of the
computer.
5. Locate the hard disk drive socket at the front of the main
system board (in front of the socket that holds the diskette
drive ribbon cable). There is a notch on one side of the
socket, as shown below.
notch
Pick up the hard disk drive cable and notice the connector
on the end of the cable. There is a tab on one side of the
connector, as shown below.
t a b
Align the connector with the socket so that the side of the
connector with the tab lines up with the side of the socket
with the notch. Then make sure that the holes fit over all of
the pins and push the connector onto the pins.
B-20 Installing
and Removing Disk Drives