5110 System Function Test - IBM 5110 Maintenance Information Manual

5110 System Function Test
The system function test consists of four tests that
exercise different I/O devices. The tests are:
System test
5114 Diskette exerciser
5103 Printer exerciser
5106 Auxiliary Tape and internal tape exerciser
The purpose of the system function test is to exercise
the 5110 Computer internal tape unit, the 5114 Diskette
Unit, the 5103 Printer, and the 5106 Auxiliary Tape Unit.
Any or all of these devices can be exercised if they are
in the ready state.
The system function test should be run during the
installation of the system, after feature
additions/ deletions and installation of ECs, and when
you are troubleshooting problems that the MDls/MAPs
cannot find.
When you have identified the failing device, the next
step is to select the I/O exerciser for that device and
run the test. These tests loop automatically, thus
enabling you to probe/scope various control lines while
trying to locate the problem.
A typical sequence for finding problems using the 5110
system function test is:
Symptom: A customer reports that the time required
to run his programs has doubled, and he does not
get any errors while the programs are running.
This symptom could indicate that the 5114 Diskette
Unit is failing but because of the error retry
capabilities of the 5110, the program eventually runs.
Step 1: Run the 5110 system function test and use
the loop on system test option. Let the test loop for
some time while the 5110 is logging the errors.
Step
2:
Use the display totals option to help you
identify the device and failing I/O command. Then
use the device exerciser test to further isolate the
problem.
For example, if the problem occurs during a write
operation, use the diskette exerciser in write mode. Do
not use the stop-on-error option, and probe/scope the
signal lines while referring to the IBM 5110 Logic
Manual, SY31.Q552.
4-80
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