IBM System/36 Maintenance Information Manual page 83

S. Display Key Test
a. Press the Select Function key and select function E (Compare Address and Stop).
b. Press the Display key.
If the Output display is blank, except for a 0 or 1 in the rightmost position, the control panel is
correct. Continue with step Sb. If the control panel is not correct, suspect the following FRU:
%
I
FRU
99
If the Output Display light goes on, continue with step Sc. If the Output Display light does not go
on, go to step Sd.
c. Press the Display key again.
If the Output Display light goes off, go to step Se. If the Output Display light does not go off,
continue with step Sd.
d. The control panel is not operating correctly. Suspect the following FRUs:
%
FRU
8S Control panel
10 Operator panel cable
S AIF2
e. Set the Security switch to the Normal position (only the Power On light is on). Press each of the
four input keys and the Display key several times.
If the control panel does not change, go to "lOS System Entry Procedure" on page 1-2. If the
control panel changes in any way, or if the Power On light was not the only light on, suspect the
following FRUs:
%
FRU
8S Control panel
10 Operator panel cable
S AIF2
Section 5. Control Panel Procedures
5-7