IBM 3270 Maintenance Manual page 37

If the system unit fails to complete POST, you
could receive an incorrect audio response, a
blank screen, or an error message that will
remain on the screen. Make a note of any error
message as soon as it appears. If multiple errors
occur, troubleshoot the one that appears first.
POST Errors
Whenever a POST failure occurs, make sure that
all cables are properly connected and all
switches are properly set. Section
4,
"Locations," shows where the switches are, and
Section
6,
"Switch Settings," shows how they
should be set.
Following is a list of some errors you may
receive during POST. In the examples below, X
can be any number.
• A blank display
• An incorrect audio response (no beep or more
than one beep)
• A error message like:
601
XXXXX XX201
or
1701
or even a combination like:
300000 00 201
601
After an error message appears on the screen,
the next line displayed is:
"ERROR(Resume
=
"Fl" Key)" ,
2-6 Maintenance Information