IBM 3270 Maintenance Manual page 351

1.
Press 0, then Enter to select RUN
DIAGNOSTIC ROUTINES.
2. Depending on the configuration of your
system, questions about your attached devices
may appear on your screen. Press Y or N as
required, then press Enter.
3. Press Y or N (IS THE LIST CORRECT?), then
press Enter. (If the list is incorrect, follow
the instructions on the screen to correct the
list before answering yes.)
4. Press 0 (RUN TESTS ONE TIME), then press
Enter.
5. Press 3, then 2 (DISPLAY ADAPTER), then
press Enter.
Note: Patterns will appear on the screen for
approximately 60 seconds while the display
diagnostics run.
DID YOU GET A 32XX DIAGNOSTIC
ERROR?
NO
Go to page 3-3200-8.
YES
3-3200-2 Maintenance Information