IBM 3270 Maintenance Manual page 198

Continuity Check
Check the continuity of the keyboard adapter
cable.
To System Uriit To Keyboard
,
----
~
6 0 0 1
7 0 0 2
0 1
3 0
05 10
o
3
0 4 3
2
0
80 0 4
0
425
0
90 0 5
0
0
'-....J
1
1
2
2
3
4
4
5
5
6
I
7
8
4
9
2
IS THE CONTINUITY OK?
YES Replace the system board. See Section 5,
"Removal/Replacement and Adjustments."
NO Replace the keyboard adapter cable. See
Section 5, "Removal/Replacement and
Adjustments."
October 1984 3-300-15