Power-On Self Test (Boot Check) - Panasonic Toughbook CF-18BHKZXDM Service Manual

7 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.
z Start .............Test begins automatically when power switch is set to ON.
z 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.),
z 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
1-2-2-3
1-3-1-1
1-3-1-3
1-3-4-1
1-3-4-3
1-4-1-1
2-1-2-3
2-2-3-1
(1 (long sound) -2-3-4)
Error message
BIOS ROM error
BIOS ROM error
RAM error
Keyboard controller error
RAM error
RAM error
RAM error
BIOS ROM error
Occurrence of unexpected offering
12