IBM 3180 1 User Manual page 83

Is the green light ON (located through the top front vent)?
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1. Set the Power switch to Off.
2. Turn the lever on the bottom of the logic element to the
open position.
Open Closed
3. Slide the locking bars on the right latches of the logic
element as shown below.
Locking Bars
4. Push in and hold the two right latches on the logic element;
then, while holding the latches, pull the right side of the
logic from the display element.
Latches
Chapter 4. Fixing Display Station Problems 75