IBM 5280 User's Setup Manual page 67

60
d. Insert the connector into the socket and turn the retaining ring
clockwise until the ring is tight.
/socket 1
~,
/ Retaining Ring
e. Go to the printer and look at the access panel (on the back of
the printer).
Access Pa ne I
(IBM 5256)
Access Panel
(IBM 5225)
Access Panel
(IBM 5224)