IBM 3270 Maintenance Manual page 181

1. When the SYSTEM CHECKOUT menu
appears, press 0 (RUN TESTS ONE TIME)
then Enter.
2. When the next menu appears, press 2 then
Enter to select the MEMORY tests.
If the diagnostic runs successfully, a "Memory
200" will appear ve17Y briefly followed by the
screen shown below.
SYSTEM CHECKOUT
0- RUN TESTS ONE TIME
1 - RUN TESTS MULTIPLE TIMES
2 - LOG UTILITIES
3 - EXIT DIAGNOSTIC ROUTINES
ENTER THE ACTION DESIRED
Return to the page you came from and continue
with the procedure there.
3-200-56 Maintenance Information