IBM 3180 1 User Manual page 80

Is the display completely dark?
No Replace the logic element
{Go to Chapter 5.)
If the problem still exists,
replace the display element.
1. Set the Power switch to Off.
2. Check to make sure that there is power to the outlet and that
your power cord is working properly.
To determine if your power cord is working properly, exchange
the one on your display station with one you know is working.
(If your power cord Is not working, go to Chapter 5.)
3. Set the Power switch to On.
4. From the back of the display station, look for the red and
green lights through the top front vent (shown below).
Red Light Area
Are both the red and green lights ON?
Replace the display element.
(Go to Chapter 5.)
If the problem still exists,
replace the logic element.
-Green Light Area