HP Integral Personal Computer Service Manual page 86

• ..... k.r
Test.
This
test checks the speaker by outputting an ascending musical scale. If you do not
hear the notes, the speaker (or its associated circuitry) is bad.
• Short HP·I. ". ... This test checks the built-in HP-IB interface.
• Short Printer T •• t. This test checks the printer control
circuitry and prints three lines.
H
the test is
passed, the printer will output the results of all tests
in
the sequence.
During the
sequence
test messages are displayed and printed to indicate which tests have been passed
or failed. Once the display /GPU test is done, you can
halt the sequence test if desired by pressing any
key.
When the sequence test is completed, a function key menu appears. You can repeat any individual test
by pressing the appropriate function key.
In
addition, there is a function key that allows you to repeat
the entire sequence test, and there are function keys for three
extended tests
(refer to 'Service ROM
Extended Tests' below).
ContiMlou.llocI •• You can run each of the tests in continuous mode (except the complete keyboard
test, described below). Press the (
Shift)
key and the appropriate function key. The test will run and
repeat continuously. You can exit any test (except the complete keyboard test) by pressing
(ESC ).
Servic. ROIl Ext.nded T ••
t ••
The service ROM provides three extended tests: the
printer test,
the
complete keyboard test,
and
continuous HP-IB test.
Not •• The printer test and the complete keyboard test must be run to completely evaluate the
computer. The continuous HP-IB test is used for component-level HP-IB troubleshooting if the
short HP-IB test or the service diagnostic disc HP-IB test indicates an HP-[B failure.
• Printer T •• t.
This
test prints a page using various character sets and print pitches that you can
analyze for consistency and uniformity.
You can also run this test with the operating system installed by pressing and holding the LF (line-
feed) button while you turn on the power, then releasing the button.
• COmplet. K.,......,. T .... This test checks both HP-HIL loops. The test searches for a keyboard,
tests the loop to which the keyboard is connected, then gives you 10 seconds to unplug the key-
board and connect it to the other loop. At the end of this period, the other loop is tested.
After both loops have passed the test, a representation of the keyboard is displayed. You can then
test each key. When you
press
a key, its outline changes to black if the key is good. Pressing the
same key repeatedly toggles the key outline from amber to bla.ck and back again. Blacken all keys to
complete the test. (You can execute this test easily by running your finger quickly along each row of
keys.) After all keys have been blackened. the display will flash and
t~e
speaker will beep. While
the keyboard outline is displayed, you can exit the test if
d~ired
by pressing (
CTRL
)@).
• Contln __ HP·I. T •• t. This test, like the other continuous tests, is started by pressing the (
Shift )
key
and the function key at the same time. However, this test (unlike the short HP-IB test) outputs
alternate highs and lows to certain pins in the built-in HP-IB connector. You can check the output
using an oscilloscope or logic probe.