IBM 3180 1 User Manual page 99

If your problem occurs intermittently {now and then) perform
the following:
1. Set the Power switch to Off and wait five seconds.
2. Press and hold any key and set the Power switch to On.
3. After the display appears, press and hold the Alt key;
then press the Test key. A T will appear on the
status line.
^' " ^SEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEHEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEKEEEEE*"^^
IAAAAAAAAAAAAAAAAAAAAAAAWAAAAAAAAAAAAAIAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAH
II H li
<< H lllll<HHKHKHIIHI<!IHII)IM!!KHHKHMHHIIHIIIfHKHHHHH II
H IIHHilHHHHHHIlHIIHHHIIilHHHHHHHKIIIIHHIIHHKHHH H
t. f: El
fEEEEEEEEEEEEEEEEEEEEEF.EEEEEEEEEEEEEEEElKEKl
KKilllEEF-EEEEEEEEEEKEEEEEEEI
4. Press the key shown below.
Chapter 4. Fixing Display Station Problems 91