Epson Equity 286 PLUS User Manual page 189

4. Position power supply connector P4 so the large tab on the
connector faces the right side of the computer. Beginning
with the six pins toward the back of the computer, carefully
line up the holes in the connector with the pins in the
socket. Make sure the holes fit over all six pins and then
push the connector onto the pins.
Caution
If you do not correctly align the holes with the pins in the
socket, you could severely damage your computer when
you push in the connector.
5. Connect power supply connector PS to the remaining six
pins in the socket using the same procedure.
B-50 Installing and Removing Disk Drives