Sharp PC-4741 Service Manual page 37

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8-5-3. Keyboard & Speaker Check
This program test the keyboard and ~peaker fUnctiOns. When this test
program is chosen, the sub-menu _
sliown~
bEliow appears. you may
choose the desired test item
by
lyping the
respective·
number.
Depression of 0 causes the control
fd'retum to
the
Individual devices
diagnostic menu.
Keyboard
&
Speaker Check
1 •• - US English keyboard check
~
--- Other keYboards check·
[j --
Exit
Enter selected number:
Keyboard & Speaker .Check Menu
• Keyboard check
Whenilhls test.starts. th!3. keyboard layout appears. Depressing: any
key makes it emphasized with aI/ toned to indicate that the key has
been pressed. Right and left Ctrl key is marked at the same time. Fn
key is marked by pressing wilh cusor key; The test terminates:when
~sq ,ke~
is pr!3ss!3d, twia,e oonsf,lcutiv,ely,
and'
control retuni
to
the
i<eyboard
& f3peak~r
check manu. , . .
O D D 0 D O O D D
b b
D 0 . 0
[OJ
0
DDDIDDDDDDDDDDO
000000000010000
DlDDDDDDDDDDDD
C:::::JIDDDDDDDDDDII I I
0011·· ... 11100
0
o .
D O D
US English keyboard iayouf screen
The speaker can be tested using the function keys F1 through F10.
The F1 key issues the lowest beeping tone and the F10 key the
highest tone, while F2 through F9 issues the tone incremental.
8-5-4. Monochrome Adapter Check
This program tests the internal LCD controller, LCD unit,
color/monochrome CRT adapter option (CE-471A) and the
monochrome CRT interfaced to it.
The folloWing is prompted if the 'systeni console was not set up to. the
MDA when this test program is chosen.
Set Display Mo~e: t9 MonQ?hrom~, and qo~sole to ~DA.
In this case, set the display (LCD) or CRT adapter display mode to
monochrome with the,set-up menu and the system console needs to
be updated to· MDA with the
indivi~ual.
devices diagnostic menu dis-
played. If the ·system,
·con~~le
has already been set
tc?
MDA, the
follo~ing, ~ub-menu app'~~rs.
You can now choose the desired item
number 1 to 5.,
When 0 is chosen, the control returns to the individual devices diag-
nostic menu. - .
Monochrome Adaptor Check .
1 --- Monochrome display buffer check
~
--- Attribute check
3 --- Character set check
4
"'-I
8fW
mode check
5 "--:- Run all above checks
o --- Exit
Enter your selected number: '_
Monochrome Adaptor Check Menu
-36-
• Monochrome display buffer check
Theprograril tests ttlevideo RAM (VRAM) in· themohochrbme dis-
play adapter by writing and reading the test data in the VRAM.
• Attribute, check
All the attributes of the monochrol1)eqispl.ay adapter are tested Which
includes the normal, intensity, reverse video, blinking and.underlined
characters. Now you can visually check the information appeared in
the screen, referring to the followin'g:
ATTRIBUTE CHECK
NORMAL
iNTENSiTY
I
REVERSE
I
BLINK
UNDERLINE
Attribute Check Display'
• Character set check
All fonts contained in the
cha.ract~r
geO$f,ator are displaYE?d. In the
first place, characters of the normal attribute are displayed. When any
key is depressed next, characters
~it~
,intE!nsity attribute are dis-
played. Now, you can visually, check the information appeared in the
screen, referring to the following: '
CHARACTER SET CHECK
- --I
I'
IY- - -I
- -I
la:
Character Set Check Display
::t::
See the Character Format on the upper right of this page.
• 81W mode check
A black and white screen is displayed. Now, you can visually check it
while adjusting the LCD or CRT monitor.
• Run all above checks
You can check items 1 through 4.
• Error message
'" VRAM ERROR - data xxH
The test data written in the monochrome display buffer did not coin-
cide with the data read in a bit pattern of xxH (where, the bit 1 is in
xxH is an unmatch).