Service manual

Keyboard and mouse tests
Note that for the mouse test you will need a mouse jig
template to perform the test (see Appendix A - Mouse
test jig template).
Reset button sub-test
During this test you are asked to press the Reset button
to test the operation of the switch. If this button works,
the program moves onto the next sub-test automatically.
If the test fails, refer to the section entitled Action if
keyboard fails on page 1-15.
Stuck key sub-test
This sub-test tests for stuck keys or mouse buttons. If no
items are found to be stuck, the test software moves
onto the next test automatically without displaying any
information.
If any keys or mouse buttons are stuck down, you will
see the following screen display:
SOME KEYS ARE STUCK
Note the keys that are stuck, reject the
keyboard or the mouse.
Press the Break key to continue and wait.
Press the Break key and the program moves to the
Keyboard/Mouse report screen. Refer to the section
entitled Action if keyboard fails on page 1-15.
Break and Escape key stuck sub-test
This sub-test tests if the Break or Escape keys are stuck
down. If the keys are not stuck, the test software moves
onto the next test automatically without displaying any
information.
If the Break or Escape keys are stuck down, you will see
the following message on the screen:
THE ESCAPE OR BREAK KEYS ARE STUCK
DOWN. REPLACE THE KEYBOARD
Refer to the section entitled Action if keyboard fails on
page 1-15.
Mouse sub-test
This tests the three buttons on the mouse and the
movement of the mouse to the left, right, up and down.
Each of the mouse buttons (i.e. left, middle, right) are
displayed on the screen in turn, together with a pointer.
You need a mouse test jig template to perform this test.
See Appendix A - Mouse test jig template.
During this test the mouse is viewed with the cable
coming out of the top of the mouse. Take care to ensure
that the mouse does not 'skid' on the template when you
move it.
1 The test starts by clearing the screen and asking you
to position the mouse in the bottom left hand corner of
the mouse test jig.
2 With the mouse in this position, press the middle key.
3 The screen is then cleared, and a rectangle is drawn
in the bottom left hand corner with the word Left
printed inside it. Do not move the mouse at this stage.
4 Press the left hand mouse key.
5 The screen will then clear, and you should move the
mouse to the bottom right hand position on the test jig.
Ensure the mouse does not skid on the jig as you
move it.
6 As the mouse moves across the jig, a box will appear
in the bottom right hand corner of the screen. When
the mouse reaches the bottom right hand position on
the jig, the pointer on the screen should be in the
centre of the displayed box.
7 Press the right mouse button, when requested. A new
box now appears in the top right hand corner.
8 Move the mouse to the top right hand position on the
test jig. Again the screen pointer should appear in the
centre of the displayed box when the mouse is in the
top right hand position on the test jig.
9 Press the requested key.
10 Repeat this exercise for the two remaining positions.
• If the pointer does not finish in the displayed box
when the mouse is in the relevant test jig box, the
test has failed.
• If you press the wrong mouse button and the
pointer is not in the rectangle, then nothing will
happen.
• If you accidentally press two buttons together, you
will see both buttons displayed on the screen. The
screen is displayed in inverse video and the
depressed keys are displayed on the screen.
Press the Break key to continue the test.
• If you cannot make a button disappear then it will
be impossible to continue the test.
If the test fails, refer to the following section Action if
mouse falls.
If the mouse if functioning correctly, the program moves
on to the next test.
Action if mouse fails
Check that you are testing the correct mouse type by
reading the data file, or by referring to the keyboard
main menu screen. Ensure that the configuration setting
for MouseStep (0) is correct.
If, when you pressed the requested mouse button,
nothing happens or the program repeatedly claims that
two keys were pressed or the pointer will not move, then
substitute a known working mouse of the same type and
retest. This determines if the fault is within the mouse
itself or the keyboard's mouse interface. If the fault is
within the keyboard, refer to the section section entitled
Action if keyboard fails on page 1-15.
Check that roller ball is not sticking, in which case you
can remove and clean it. If the mouse still fails then
return it to an Acorn Authorised CSW for repair.
1-14 Issue 1, November 1991 Part 1- Fault diagnosis and repair