Epson User Manual page 128

4. Position the connector on the cable so the red wire aligns
with pin 1 on the drive. Make sure the holes in the cable
connector fit over all the pins; 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.) Align the notched comers of the
power supply connector and the drive's power connector;
push in the connector, as shown above.
then
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Installing and Removing Tower Drives