IBM 3270 Maintenance Manual page 199

You have gone throughout the PICs without
solving your problem.
Th~
following steps
should help you find additional audio or visual
symptoms.
1.
Check the entire system for loose or damaged
connectors.
2. Return to page 3-5-1 and review "Start".
3. Select "UTILITIES" in 'the diagnostic menu,
and start an error log, and select "RUN
TESTS MULTIPLE TIMES." This will allow
you to operate the machine thoroughly and
identify the failing symptom, go to the page
3-5-1, "Start," or the appropriate PIC for the
symptom you received.
If you have followed these procedures and
still have an unsolved problem, you should
request technical assistance.
3-30Q;.16 Maintenance Information