Epson 3865X Plus - Manual (Page 231)

If you will have two hard disk drives in your system, perform
the procedures in steps 6 and 7 again. This time, however,
connect the connector at the end of the ribbon cable to the
horizontally mounted hard disk drive you just installed. (If
necessary, turn the subassembly upside down to make it
easier to connect the cable.)
8. Looking at the subassembly, locate one of the power supply
cables that lead from the power supply (behind the
horizontal drive bays). The cables are labeled
P1, P2, or P3
and have a clear plastic connector on one end. You can use
any of the three cables. As shown below, the end of the
connector has two notched comers.
The power supply socket on the back of the drive is next to
the ribbon cable connector. The socket also has two
notched comers, as shown below.
power supply cable power supply socket
notched corners
You must connect a power supply cable to each drive you
install in your system. If you removed a hard disk drive from
the vertical mounting position, connect the power supply
cable to this drive first. If you did not remove a hard disk
drive, connect the power supply cable
to
the drive
you just
installed in the lower horizontal drive bay.
B-40
Installing and Removing Disk Drives