Sharp PC-4741 Service Manual page 42

First, all display dots are displayed. Next, the test patiems of single
dot, two dots, four dots, and ei ht dots intelVals are displayed and
their reverse videos. The above procedure is repeate again.
Visually check the pattern displayed on the screen.
When the SPACE bar is pushed in a middle of the test, the test
execution suspends. With the depression of the SPACE bar again,
the test resumes. The test terminates by the depression of the ESC
key and the control returns to the liquid crystal display check menu.
• Stripe
With this test program stripe is displayed vertical and horizontal
stripes are displayed including reverse video (four patterns).
Visually check the pattern displayed on the screen.
When Ihe SPACE bar is pushed in a middle of the test, the lest
execution suspends. With the depression of the SPACE bar again,
the test resumes. The test terminates by the depression of the ESC
key and the control returns to the liquid crystal display check menu.
8-5-11. Hardware Installation
With this program the devices connected to the PC-4700 are checked
for installation.
When this item is selected, all the installed devices appear on the
screen.
The following are the names of possible devices:
Hardware installation
System Board
Real Time Clock & Setup RAM
Main Memory (indicated by kilobytes)
Keyboard
Liquid Crystal Display
Monochrome CRT Adapter
Color/Graphics CRT Adapter
1 or 2 Floppy Disk Drive(s), Adapter
Printer Adapter
Serial I/O Card
Modem Card
Co-processor
Hard Disk Drive, Adapter
EMS Card
Hardware Installation Display
8-5-12. Floppy disk drive diagnostics
This program tests the internal 3-1/2" floppy disk drive and the exter-
naI5-1/4" floppy disk drive.
The following menu appears when this test program is selected.
Move the highlighling
to
the item you want to select, and press
ENTER. Depression of ESC terminates the test.
Floppy Disk Drive Dlagnosllcs
Read drive status
Write, read & compare check
Read only check
00 track sensor adjustment
Target sector read check
Error table display
8-5-12-1. Read drive status
This item displays the current status of the floppy disk drive(s). While
this program is executing, the system periodically detect some status
change, it causes the buzzer to sound and displays the new status on
the screen.
• Operation
Pressing any key, the test terminates.
-41-
8-5-12-2. Write, read & compare check
-
P C-4741
The system writes the specified data to the floppy disk, reads the
same data from the floppy disk, and then compares them.
The specified data to be written is DOH to FFH increment pattern
when the pass count is 0, otherwise the data is 2bytes repetitive
pa«ern of "B6DBH".
• Caution
When this test is executed, all the contents stored in the floppy disk
are destroyed. So be very careful with this test. In addition, it Is
necessary to release "Write Protect".
• Operation
When this test is selected, the following message is displayed.
Please insert the formatted scratch disk in the drive.
At the time, insert the test disk in the drive to be checked and press
ENTER. If the drive is not ready or the test disk isn't inserted in the
drive, the following message is displayed and the test terminates.
Drive not ready.
Specify whether to check the drive or not in the following message.
Drive_A (1.44MB) test? [Yes No]
Move the highlighting to the mode you want to select and press
ENTER. The string in the parenthesis represents the capacity of the
disk.
Specify the range of cylinders to be checked in the following mes-
sage.
Cylinder range?
Drive_A [01
H
79] = II-II
Type the starting cylinder number at first and press ENTER. Then
type the ending cylinder number and press ENTER.
Specify the number of sector accessed by one instruction in the
following message.
Sector count?
Drive_A [I, 3, 9] = I
Type the sector count in the displayed count and press ENTER.
Specify the number of retrial in the following message, when an error
has occurred.
Retry count? [0
H
4] = I
Type the retry count in the displayed range and press ENTER.
Specify whether to stop or continue the test, when an error has
occurred.
Error stop? [Ves No]
Move the highlighting to the mode you want to select and press
ENTER.
Specify Whether to execute the test or not.
Test slart
?
[Ves No]
Move the highlighting to the mode you want to select and press
ENTER. When
~ntering
"No", control exits to "specification of the
checked drive". On the other hand, when entering ''Yes'', starts the
test.