IBM 3270 Maintenance Manual page 180

The following shows how to rerun the diagnostic
for Memory and the results of a successful run.
1. With the Diagnostics diskette in drive A, and
the load lever down, set the system unit
On/Off (I/O) switch Off
(0).
2. Wait 5 seconds and set the system unit On/Off
(I/O) to On (I).
3. When the diagnostic menu appears, press 0
(RUN DIAGNOSTICS) then press Enter.
4.
When the Installed Devices menu appears
press Y (IS THE LIST CORRECT?) then press
Enter.
CONTINUE
October 1984
3~200~55