Power-On Self Test (Boot Check) - Panasonic Toughbook CF-28 Service Manual

4.2. Power-On Self Test (Boot Check)

4.2.1 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.
l Start .............Test begins automatically when power switch is set to ON.
l 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.)
4.2.2 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.),
l Table of errors classified by beep sounds
Diagnosis
Main board
(Note) A beep sound is also issued in case of other I/O trouble.
= short sound (about 0.2 sec.), Length between sounds is about 0.1 sec.
Beep signal sound
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 controller 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
(1 (long sound) -2-3-4)
Error message
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