Page 192 Troubleshooting 90030500B
Front panel display diagnostics
1.
Press either the left or right pushbutton on the front panel during the POST tests to
enter diagnostic mode. Check that all of the LEDs go OFF, the left alphanumeric
display is blank, and the right alphanumeric display shows
1
. The right decimal
point blinks at one second intervals. At this point,
Test 1 - Panel Light Test
is
selected.
2. To select a test, press the right pushbutton (>). The right alphanumeric display
will cycle through the possible test numbers. Once you have selected the desired
test, press the left pushbutton (<) to start the test. The left decimal point lights to
indicate the test has started and the appropriate test results are displayed on the
alphanumeric display.
The selected test will continue to cycle until an error is detected or until you stop
the test by pressing the (<) pushbutton. Failures are detected and the cumulative
total is shown on the alphanumeric display.
3. To stop the test, press and hold the < button, and wait for the left decimal point to
go OFF. Then release the (<) pushbutton and the test will stop.
The left alphanumeric display will display either a
P
or an
F
for pass or fail respec-
tively. The right display will show the test number that was just executed. For exam-
ple,
P3
indicates that test 3 has passed, while
F3
indicates that the same test failed.
Basic Test Descriptions
The following descriptions explains the operation of each diagnostic test. Each test is
the same whether it is run from the terminal or the front panel.
Test 1 - Panel Light Test
This test cycles the ten LEDs on and off, and in an alternating on/off pattern. It also
cycles both alphanumeric displays in one second intervals. You must make a visual
check of the LEDs and displays to ensure that they all cycle correctly.
Test 2 - Memory Test
The memory test takes about two minutes for each pass.
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