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S) 6.0 Diagnostics
Q) 6.1 What do the
POST beeps mean?
Beep(s)
Errant device
No beep
Power supply, system board
1 short beep
System OK
2 short beeps
POST Error displayed on monitor
Repeating short beeps Power supply, system board
3 long beeps
3270 keyboard card
1 long, 1 short beeps System board
1 long, 2 short beeps Display adapter (MDA, CGA)
1 long, 3 short beeps EGA
Continuous beep
Power supply, system board
Q) 6.2 What do the
POST codes mean?
Note if errors are encountered with the reference disk in the drive
they will be identified.
See Appendix D for full listing.
Q) 6.2a What do the
CP codes mean?
See CP-Codes.
Q) 6.3 Why when my
system boots fine sometimes the diagnostics report errors?
This is usually a case of non-IBM components added to the system.
Some examples are video adapters, hard drive controllers, and the like.
In most cases, POST is always right and the reference disk is tricked into
thinking there is a problem so don't have a heart attack when it gives
you the: 'Replace system board' message it could just be a normal option
generated error. Also lock-ups are common with some video cards added
to the system.
For IML systems, a common problem is downlevel reference
and diagnostics disks.The current refdisk and diags disk may have been
used to update the system partition, but sometimes a outdated file remains.
The system then has a mix of old code and new.
For non-IBM adapters, no *.dgs files exist. That's why
you NEVER see non-IBM adapters under "Run System Checkout". SCSI devices
and memory use the IBM *.dgs files (so that's why you see them).
Q) 6.4 How can I *REALLY*
find out if these errors are just bogus?
The *EASY* method if your system hangs on the full tests is to enter
<CTRL>-A from the reference disk main menu and select the test it hung
up on. If everything checks out then no problem.
If you want it to run the full test without hanging the only method
is to remove each card and reboot with the reference disk allow it to auto-configure
and then reboot and run the reference disk tests. If the system hangs
now then there is a problem with the system not related to added options,
contact IBM or a repair tech promptly and try not to use the machine until
it is
looked at.
Q) 6.5 OK I got a problem,
who can I get to fix it?
Anyone know of a good repair facility??? They are all currently
closed.
Q) 6.6 What are
the wrap plugs the reference disk sometimes refers too?
In order to perform a total test of the ports (when running IBM diagnostics)
you need to provide the incoming signals to the port via a wrap plug.
The constructions for each (serial and parallel) wrap plug can be found
HERE.
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