Chapter 8. Service-Man Diagnostic - Sharp PC-4741 Service Manual

CHAPTER 8. SERVICE·MAN
DIAGNOSTIC
8-1.lntroduction
This diagnostics is used to check the operating state of the system
unit, keyboard, and peripheral units, when an option device is inter-
faced to the PC-4700 or when there is a state of error.
The following four kinds of diagnostics are provided to trace the exact
cause.
Individual device diagnostics
Used to test the real time clock, setup RAM, memory module, key-
board, speaker, monochrome adapter, color/graphics adapter,
coprocessor printer, serial 110, modem, and liquid crystal display.
When an error is found, the failure is reported with the error status.
Floppy disk diagnostics
This test program performs tests in more details than the test by the
individual device diagnostic and may also be used to perform aging
test of the floppy disk.
Hard disk diagnostics
This test program performs tests in more details than the test by the
individual device diagnostic and may also be used to perform aging
test of the hard disk.
The diagnostic program disk comes supplied on a 3.5" MD-DOS
diskette with the above diagnostic programs and the program loader.
It has been designed to test almost any PC-4700 function and its
peripherals.
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P C-4741
8-2. Diagnostic
pr~gram
structure
The following figure shows the confIguration of the programs stoMa
on the diagnostic program diskette.
Any of three diagnostics can be chosen by typing the number indi-
cated by the diagnostic program.
When an individual device diagnostic is chosen, a sub-menu is dis-
played to make choice in the same manner.
REAL TIME CLOCK
~
& SETUP RAM
CHECK
H
MEMORY CHECK
>-<
KEYBOARD &
SPEAKER CHECK
--<
MONOCHROME
ADAPTOR CHECK
H
COLORIGRAPHICS
I
ADAPTOR CHECK
INDIVIDUAL
DEVICES
COPROCESSOR
DIAGNOSTIC
H
CHECK
H
PRINTER CHECK
l
DIAGNOSTIC
r
LOADER H
SERIAL 1/0 CHECK
H
MODEM CHECK
I
H
LCD CHECK
HARDWARE
INSTALLATION
FLOPPY
~
FLOPPY DISK
DISK
CHECK
DIAGNOSTIC
Y
HARD DISK
DIAGNOSTIC
HARD DISK CHECK
I