2.4 System Board Troubleshooting
This
section describes how to determine
if
the upper or lower system board
is
defective or not
functioning properly.
Start with Procedure 1
and
continue with the other procedures as
instructed. Procedures described
in
this section
include:
Procedure
1:
Message Check
Procedure
2:
Printer Port
LED
Check
in
Boot Mode
Procedure
3:
Printer Port
LED
Check
in
Resume Mode
Procedure
4:
Diagnostic Test Program Execution Check
Procedure
5:
System Board Replacement Check
Procedure
1
Message
Check
When
the power
is
turned
on,
the
system
performs the Initial
Reliability
Test (IR T) installed
in
the BIOS
ROM.
The IRT tests
and
initializes each
IC
on the
system
boards.
o
If
an
error message
is
shown on the
display,
perform Check
1.
o
If
there
is
no
error message, go to Procedure
2.
o
If
Toshiba MS-DOS
is
properly loaded, go to Procedure
3.
Check 1
If
one
of
the
following
error messages
is
displayed
on the screen, press the
Fl
key
as the message instructs.
2-8
(a) * * *
Error
in
CMOS.
Bad
HDD
type
* * *
Check
system.
Then
press
[Fl]
key
.....
.
(b)
***
Error
in
CMOS.
Bad
battery
***
Check
system.
Then
press
[Fl]
key
.....
.
(c) * * *
Error
in
CMOS.
Bad
check
sum
* * *
Check
system.
Then
press
[Fl]
key
.....
.
(d)
***
Error
in
CMOS.
Bad
memory
size
***
Check
system.
Then
press
[Fl]
key
.....
.
(e)
***
Error
in
CMOS.
Bad
time
function
***
Check
system.
Then
press
[Fl]
key
.....
.
These errors occur
when
the system configuration preserved
in
the
RTC
memory
(CMOS-type
memory)
is
not the
same
as
the actual configuration or when the
data
is
lost.
If
you
press the
Fl
key
as the message instructs, the
system
configuration
in
the
RTC
memory
configuration
is
set to the default setting.
If
Error Message (b)
appears often when the power
is
turned
on,
replace the
RTC
battery.
If
any
other
error message
is
displayed,
perform Check
2.
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