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5 Power-On Self Test (Boot Check)
Outline of POST
The
set
has a
boot check
function
called
POST
(Power-On Self
Test) in
it.
The condition of the main
body
is diagnosed
by
checking
beep
sound or error code.
Start __
_
_
__
__
_
...
Tesl begins
automatically when power switch is set to ON_
Normal
finish
.....
After
memory checking,
a
beep sound is issued once and
the
set is placed into automatic stop.
Note:
If no error occurs, nothing is displayed. (No display of OK, etc.)
Error Diagnosis by Checking Beep Signal Sound
The
beep
sound is
as follows:
(Length
of bar shows length
of
sound_)
_
= long sound
(about
0.4 sec.),
•
= shorl sound
(about
0.2 sec.),
Length
between sounds is about 0.1 sec.
Table of errors
classified
by
beep
sou
nds
Diagnosis
Beep
signal sound
Error
message
Main
board
1 (long sound)-2
BIOS
ROM
error
1-2-2-3
BIOS ROM error
1-3-1-1
RAM
error
1-3-1-3
Keyboard contro ller
error
1-3-4-1
RAM error
1-3-4-3
RAM error
1-4-1-1
RAM error
2-1-2-3
BIOS
ROM error
2-2-3-1
Occurrence of
unexpected
offering
(Note)
A beep sound is a lso
issued
in case of other
I/O
trouble.
15
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