IBM 3270 - Watching the Power-On Self Test (POST)

14. Align the slot in the adapter card retaining bracket with
the hole in the rear of the unit. Start the screw clockwise;
then tighten
it with a flat-blade screwdriver or a 3/16-inch
nutdriver.
[3 [3[3
~~--------------~------------~I
Not
Aligned
Properly
Aligned
AP A Adapter 9