Service manual

Saving the customer's CMOS RAM
settings
You need to save the contents of the CMOS RAM before
any of the tests are run, and restore them when the last
test is over, otherwise the settings will be overwritten
This is because the test software uses the CMOS RAM
to control the test sequence and store the results. Follow
the procedure given below to save the customer's
CMOS RAM settings.
1 Insert the test disc (0292,824) into the floppy disc
drive.
2 Hold down the Shift key and switch the computer on (
do not touch the Delete key). Keep the Shift key held
down while the computer powers up.
The following menu will be displayed:
MENU VX.XX UN-DEF
(A) Test Suite
(B) Individual Tests
(C) Load / Save CMOS
(D) Quit
Select the test type of your choice
3 Select option (c) Load / Save CMOS by pressing the
c key.
4 The Load / save CMOS selection will be confirmed
and then the screen will display the following menu:
LOAD / SAVE CMOS RAM VX.XX UN-DEF
1. Save CMOS RAM to disc.
2. Load CMOS RAM from disc.
3. Exit Program.
Please select the required option ?
5 Select option 1, and then replace the test floppy disc
with the data disc.
6 When prompted, enter the filename (including the full
directory path if necessary) that you want the CMOS
RAM saved to.
7 Remove the data disc and put it in a safe place.
8 Press the space bar to continue.
9 Type 3 to exit the program.
10 Switch off the computer (leave the monitor on).
Creating a CMOS test data file
If you intend to run the full test suite or the CMOS RAM
test (see the section entitled Battery backed RAM test on
page 1-9) you need to create a CMOS test data file to
save the manufacturer's default settings. Note that
before you do this you must save the customer's CMOS
RAM settings as described in the previous section.
To create a CMOS test data file, proceed as follows:
1 Switch off the computer (leave the monitor on).
2 Insert the test disc (0292,824) into the floppy disc
drive of the customer's computer.
3 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).
4 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
5 Select the Load / save CMOS option from the menu.
6 Select the save CMOS to disc option.
7 When prompted, enter the path and file name where
you want the default CMOS RAM settings saved.
8 Store this test data file on a separate disc (the CMOS
RAM test data disc).
9 Remove the test data disc and put it in a safe place.
10 Press the space bar to continue.
11 Type 3 to exit the program.
12 Switch off the computer (leave the monitor on).
You have now created a new CMOS RAM test data file.
Checking the memory size
You should check the amount of memory that is fitted to
the computer and make a note of the size as you will be
asked to choose the computer configuration in the test
suite. Each computer will have either 1 or 2 MB on the
main PCB and either 1, 2, or 3 on the memory
expansion card if any are fitted.
To find out the memory size of the computer either ask
the customer or remove the top cover as described in
Part 2 - Disassembly and assembly and check how
much memory there is in the machine.
Part 1- Fault diagnosis and repair issue 1, November 1991 1-7