Philips PCL304 - Outline Diagnostic Test; Diagnostic Description; Main Board

6.3 Outline of Diagnostics Test
This
Diagnostics
Test
Program
is
prepared
for
the
purpose
of
Testing
and
Troubleshooting
hardware
functions
of
the
computer.
This
program
is
loaded
from
the
disk
drive
and
operates
un-
der
the
management
of
MS-DOS
(Disk
Operating
System).
Diagnostics Menu
This
is
the
menu
for
the
testing
procedures.
The
menu
you
obtained
may
differ
slightly
depending
on
the
devices
installed
in
your
computer
system.
If you choose:
(1) MAIN BOARD
Test the Main Board.
(2) FLOPPY DISK DRIVE
Test
the
floppy
disk
drive
connected
to
the
system.
(3) KEYBOARD
Test the keyboard.
(4) COLOR/GRAPHICS VIDEO
Test
the
color/graphic
controller
and
display,
connected
to the system.
(5) 1 SERIAL PORT
Test
the
RS-232C
serial
port
of
the
system.
(6) 1 PRINTER PORT
Test the printer port.
(7) MEMORY
Test
the
base
memory.
(The
number
of
KB
or
will
chan-
ge
depending
on
the
configuration
of
your
system.)
and
tests the expanded memory. (The number of KB will
change
depending
on
the
configuration
of
your
system.)
6-3
6.4 Diagnostics Description
6.4.1 Main Board Test
Check reading and writing of the
timer #0 of the PIT (Programma-
ble Interval Timer). Set!Ne initiali-
zing value on the timers #0 and ve- |
rify that counting downs functio- |
ning properly after a fixe period
of time has elapsed.
The timer #1 is not used as a re-
fresh counter for the DRAM and
does not need to be checked.
Check reading and writing of the
page register.
Bytes I/O R/W test
Data: 00H, 55H, AAH, FFH.
Check reading and writing of the
address register of the DMAC #0
and of the word count register of
the DMAC #0
Data: 00H, 55H, AAH, FFH
I ing Writing Dia-
| gnostics and
Counter Test
Page Register
Reading/Writing
Diagnostics
DMA Controller
Reading/Writing
Diagnostics
PIC Reading/ Check reading and writing of the
Writing #0 IMR (Interrupt Mask Register)
Diagnostics and of the PIC (Programmable Inter-
Interrupt Test rupt Controller). Verifies whether a
PIC #0 interrupt test is carried out
properly through a TIMER inter-
rupt test
Confirm the data in real time clock |
is within the proper range. |
| RTC Diagnostics
PEND 5s ad
Perform the byte reading/writing
test using data patterns OOH, 55H, |
AAH, FFH. This applies to load ad- |
dresses from 00000H to top of the |
Procedure
Press any key to recall a scanning |
code, which is convertéd to a
code. Confirm that the code cor-
responds to the denotation show
CS 55 815