IBM 5280 User's Setup Manual page 35

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c. Position the cable so that the yellow label is on top; then push
the cable end into the socket.
Note: If the cable end does not fit easily into the socket, be sure that
the connector guides line up with the socket guides.
d. Make sure that the snap-locks lock into position.
13. Replace the cable access cover.
14. Cut and remove the string from the power cord plug.
15. Insert the power cord plug into a grounded receptacle.