Service manual

Service Manual
You need to save the contents of the CMOS RAM before
any of the tests you run, and restore them when the last
test is over:
1 Insert the dealer test disc (0286,832) 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 V x.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).
11 Insert the test disc (0286,832) into the floppy disc
drive.
12 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 a momentary red
border around the screen confirms that a power-on
Delete is taking place. (This action clears the CMOS
RAM and resets the configuration defaults to the
manufacturer's original specification).
13A boot file will now execute resulting in the following
menu being 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
In order to run any of the tests described later in this
chapter, you must first have saved the CMOS RAM
settings, as described above.
Creating a CMOS test data file
Before you run the tests described later in the chapter,
you may need to create a CMOS test data file. This is
used in the CMOS RAM test (see the section entitled
Battery backed RAM on page 4-8).
To do this, proceed as follows:
1 Follow steps 10, 11, 12 and 13 in the previous section
entitled Preparing to run the tests.
2 Select the Load / Save CMOS option from the menu.
3 Select the Save CMOS to disc option.
4 When prompted, enter the path and file name where
you want the default CMOS RAM settings saved.
5 Store this test data file on a separate disc (the CMOS
RAM test data disc).
You have now created a new CMOS RAM test data file.
Completing the tests
When you have finished testing, you need to restore the
customer's original CMOS RAM settings:
1 Press the Shift and Break keys simultaneously. This
will produce the top level 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
2 Select option (C) Load / Save CMOS. This will produce
the following menu:
LOAD / SAVE CMOS RAM V x.xx UN-DEF
1. Save CMOS RAM to disc.
2. Load CMOS RAM from disc.
3. Exit Program.
Please select the required option ?
3 Select option 2, and then replace the test disc with the
data disc.
4 When prompted, enter the filename (including the full
directory path if necessary) that contains the customer'
s CMOS RAM configuration settings. Press Return.
5 Remove the data disc when prompted.
6 Press the space bar to continue.
7 Type 3 to exit the program.
8 Switch off the power to the computer (at the mains
switch on the rear of the machine).
4-6 Issue 2, June 1991 Part 4 - Fault diagnosis