Epson EL 3S/33 - Manual (Page 64)

If you do not correctly align the holes with the pins, you
could severely damage your system board when you push m
Connecting the Drive and Power Cables to the Drive
Follow the steps below to connect the hard disk drive ribbon
cable and a power supply cable to the drive:
1. Locate the free connector on the end of the hard disk drive
ribbon cable.
2. Locate pin 1 on the drive connector. If you do not see it on
the connector casing, turn the drive over so you can see the
drive’s circuit board. You will see a 1 or 2 printed on the
board to identify the side of the connector containing pin 1.
3. Align the connector on the cable so that the red wire will be
closest to pin 1 on the drive.
4. Make sure the holes in the cable connector fit over all the
pins in the hard disk drive connector; then push in the
connector.
5. Locate one of the power supply cables that lead from the
power supply. (They have multi-colored wires and a plastic
connector on the end.)
Installing and Removing Drives 4-5