Service manual

About the tests
The test disc (0292,824) contains various menu-driven
tests. The menus are generated from a set of text files.
(You can generate new text files if you wish).
There are two types of test:
• subjective — you must judge whether the equipment
passes or fails these tests. For this reason it is a good
idea for you to familiarise yourself with the correct
results given by a known good computer (see the
section entitled Validating the test equipment on page
1-4). In this way you will be in a better position to
judge faulty results.
• non-subjective — the test program passes or fails the
equipment.
How to operate the test software
The tests are menu-driven, so the menu option that you
select determines the test to be executed. To select an
option, type the corresponding letter. Some menu
options lead to further options, other options run tests
immediately.
During the test sequence, the software runs through
each individual test and then prompts you to press the
space bar:
PRESS <SPACE BAR> TO CONTINUE
If the computer passes the current test, the test program
waits for approximately 1 second and, if you do not
press the space bar in this time, continues with the next
test. If you do press the space bar within the 1 second
period, the program continues immediately.
If the computer fails the current test, the test program
bleeps and waits for you to press the space bar. This
allows you to make a note of the fault and then continue
with the tests. You should also note any other failures,
but bear in mind the possibility that these failures could
be caused by the first recorded failure.
If an expected message has not appeared on the screen
within 30 seconds, you must record the fault, switch off
the machine and repair before retesting.
Repairing faults
When repairing a computer, you should repair the faults
in the order in which they occurred during the test (i.e.
repair the first recorded failure first).
Running the functional tests
The following is an example of how to test a standard
computer.
Note: In order to run the functional tests you must
first have saved the customer's and manufacturer's
CMOS RAM settings, as described in the previous
sections.
1 Insert the test disc (0292,824) into the floppy disc
drive.
2 Switch on the computer, whilst holding down the
Delete key (not the backspace key), the Shift key
and the " key on the numeric keypad. Keep holding
down these keys for several seconds, until the auto-
boot file is executed. (This action clears the CMOS
RAM and resets the configuration defaults to the
manufacturer's original specification).
3 A boot file now runs and displays the following menu:
MENU VX.XX UN-DEF
(A) Test Suite
(B) Individual Tests
(C) Load / Save CMOS
(D) Quit
Select the test type of your choice
4 To run the entire test suite, select option A from the
above menu. To run an individual test, select option B
from the menu and select the appropriate test. Refer
to the section entitled Additional individual tests on
page 1-16 for details of the individual test menus and
then read the description of the test in the following
sections. The instructions below refer to the full
functional test suite.
5 If you selected option A, select the A5000 option
from the next menu which will configure the CMOS
RAM for the selected computer. The computer
displays a list of choices:
(A) A5000 1Mb Fun. Test
(B) A5000 1Mb Soak Test
(C) A5000 2Mb + HD Fun. Test
(D) A5000 2Mb + HD Soak Test
Press * to quit - for top menu
Select the functional test that is correct for the
memory configuration of the machine.
6 A list of settings will then appear on the screen. These
are the test configuration modules read from the test
data file and set up in the CMOS.
1-8 Issue 1, November 1991 Part 1- Fault diagnosis and repair